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Journal articles on the topic "MOFs"
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Li, Ruofan, Xiaoli Yan, and Long Chen. "2D Conductive Metal–Organic Frameworks for Electrochemical Energy Application." Organic Materials 06, no. 02 (May 2024): 45–65. http://dx.doi.org/10.1055/s-0044-1786500.
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Two-dimensional conductive metal–organic frameworks (2D c-MOFs) have attracted research attention, benefitting from their unique properties such as superior electronic conductivity, designable topologies, and well-defined catalytic/redox-active sites. These advantages enable 2D c-MOFs as promising candidates in electrochemical energy applications, including supercapacitors, batteries and electrocatalysts. This mini-review mainly highlights recent advancements of 2D c-MOFs in the utilization for electrochemical energy storage, as well as the forward-looking perspective on the future prospects of 2D c-MOFs in the field of electrochemical energy.Table of content:1 Introduction2 Design Principles of 2D c-MOFs3 Synthesis of 2D c-MOFs4 2D c-MOFs for Electrochemical Energy Storage4.1 Supercapacitors4.2 Metallic Batteries4.2.1 Lithium-Ion Batteries4.2.2 Sodium-Ion Batteries4.2.3 Zinc-Ion Batteries4.2.4 Sodium–Iodine Batteries4.2.5 Lithium–Sulfur Batteries4.2.6 Potassium-Ion Batteries5 2D c-MOFs for Electrochemical Energy Conversion6 Conclusions and Outlook
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Dinman, J. D., and R. B. Wickner. "Translational maintenance of frame: mutants of Saccharomyces cerevisiae with altered -1 ribosomal frameshifting efficiencies." Genetics 136, no. 1 (January 1, 1994): 75–86. http://dx.doi.org/10.1093/genetics/136.1.75.
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Abstract A special site on the (+) strand of the L-A dsRNA virus induces about 2% of ribosomes translating the gag open reading frame to execute a -1 frameshift and thus produce the viral gag-pol fusion protein. Using constructs in which a -1 ribosomal frameshift at this site was necessary for expression of lacZ we isolated chromosomal mutants in which the efficiency of frameshifting was increased. These mutants comprise eight genes, named mof (maintenance of frame). The mof1-1, mof2-1, mof4-1, mof5-1 and mof6-1 strains cannot maintain M1 dsRNA at 30 degrees, but, paradoxically, do not lose L-A. The mof2-1, mof5-1 and mof6-1 strains are temperature sensitive for growth at 37 degrees, and all three show striking cell cycle phenotypes. The mof2-1 strains arrest with mother and daughter cells almost equal in size, mof5-1 arrests with multiple buds and mof6-1 arrests as single large unbudded cells. mof2-1 and mof5-1 strains are also Pet-. The mof mutations show differential effects on various frameshifting signals.
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Dhankhar, Sandeep Singh, Nayuesh Sharma, and C. M. Nagaraja. "Construction of bifunctional 2-fold interpenetrated Zn(ii) MOFs exhibiting selective CO2 adsorption and aqueous-phase sensing of 2,4,6-trinitrophenol." Inorganic Chemistry Frontiers 6, no. 4 (2019): 1058–67. http://dx.doi.org/10.1039/c9qi00044e.
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Design of Zn(ii) MOFs, [{Zn(BINDI)0.5(bpa)0.5(H2O)}·4H2O]n (MOF1) and [{Zn(BINDI)0.5(bpe)}·3H2O]n (MOF2) for selective CO2 storage and aqueous-phase detection of TNP is demonstrated.
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Shen, Guowang, Mengli Li, Yuhao Chen, Zhuang Xu, Xugen Wang, and Bin Dai. "Effect of Pyrolysis Conditions on the MOFs-Derived Zinc-Based Catalysts in Acetylene Acetoxylation." Catalysts 13, no. 3 (March 6, 2023): 532. http://dx.doi.org/10.3390/catal13030532.
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The preparation method and calcination temperature of metal-organic framework (MOFs)-derived materials are critical factors affecting catalytic performance. In this work, the preparation conditions of MOFS precursors were optimized, and zinc-based catalysts with different activities (MOF5-700, MOF5-750, and MOF5-800) were obtained by pyrolysis of MOFS precursors under nitrogen, which were then applied to an acetylene acetoxylation reaction system. According to the results, the conversion rate of acetic acid under catalysis was significantly different. (MOF5-700 (48%), MOF5-750 (62%), and MOF5-800 (22%)). Comparing the activity of the catalyst with the industrial catalyst Zn(OAc)2/AC (20%), MOF5-750 showed higher activity, and the acetic acid conversion rate remained around 60% after 50 h of stability testing. By characterization analysis, MOFs-derived materials were obtained after proper temperature pyrolysis. They have high mesoporous content, defects, and oxygen-containing functional groups and can maintain a good crystal structure, greatly reducing the loss of active components. This is the main reason for the good performance of the MOF5-750 catalyst in acetylene acetoxylation. Thus, the preparation conditions and favorable pyrolysis temperature of MOF derivative catalysts play a key role in the catalytic performance of acetylene acetoxylation.
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Madnasri, Sutikno, Teguh Darsono, Isa Akhlis, Heru Saputera, Meilody Indreswari, Lutfiana Maghfirotul Izza, Maria A. Simangunsong, Lambang Setyo Utama, and Uda Hashim. "Synthesis and Characterization of Metal-Organic Framework as Battery Electrodes." Jurnal Bahan Alam Terbarukan 12, no. 1 (June 20, 2023): 78–86. http://dx.doi.org/10.15294/jbat.v12i1.44170.
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Metal organic framework-derived carbons (MOFDCs) are materials with great potential and can be used as electrochemical energy storage because these have a large surface area and pore structure that can be adapted to needs. MOFs have porous crystals in which metal ions or clusters are linked by organic ligands. The purpose of this study was to determine the physical and electrochemical properties of MOF5 synthesized at different temperatures. The MOFs synthesis method which is classified as complicated can be simplified and the use of hazardous solvents can be reduced by means of partial substitution using water solvents. To prepare MOFs can be done in several ways, such as liquid phase epitaxy, supersonic cold spraying, direct gas phase preparation, and interface-assisted synthesis. MOFs have applications in optics, sensing, catalysis, adsorption, and modeling, as well as electrochemical energy storage. Potential application as an interesting electrode material to be studied through the synthesis method. In this study, MOF5 was synthesized at temperatures between 200°C-600°C. To prepare MOF5, zinc nitrate tetrahydrate and acetic acid were dissolved in DMF (N, N-dimethyl formamide). The remaining precipitate (MOF) was immersed three times in DMF and three times in chloroform for 24 hours for each immersion. In general, different MOF5 synthesis affects the microstructure, elemental content, optical properties (transmittance and absorbance), electrical properties, and electrochemical properties
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Cretu, Carmen, Roxana Nicola, Sorin-Alin Marinescu, Elena-Mirela Picioruș, Mariana Suba, Corina Duda-Seiman, Adel Len, Levente Illés, Zsolt Endre Horváth, and Ana-Maria Putz. "Performance of Zr-Based Metal–Organic Framework Materials as In Vitro Systems for the Oral Delivery of Captopril and Ibuprofen." International Journal of Molecular Sciences 24, no. 18 (September 9, 2023): 13887. http://dx.doi.org/10.3390/ijms241813887.
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Zr-based metal–organic framework materials (Zr-MOFs) with increased specific surface area and pore volume were obtained using chemical (two materials, Zr-MOF1 and Zr-MOF3) and solvothermal (Zr-MOF2) synthesis methods and investigated via FT-IR spectroscopy, TGA, SANS, PXRD, and SEM methods. The difference between Zr-MOF1 and Zr-MOF3 lies in the addition of reactants during synthesis. Nitrogen porosimetry data indicated the presence of pores with average dimensions of ~4 nm; using SANS, the average size of the Zr-MOF nanocrystals was suggested to be approximately 30 nm. The patterns obtained through PXRD were characterized by similar features that point to well-crystallized phases specific for the UIO-66 type materials; SEM also revealed that the materials were composed of small and agglomerate crystals. Thermogravimetric analysis revealed that both materials had approximately two linker deficiencies per Zr6 formula unit. Captopril and ibuprofen loading and release experiments in different buffered solutions were performed using the obtained Zr-based metal–organic frameworks as drug carriers envisaged for controlled drug release. The carriers demonstrated enhanced drug-loading capacity and showed relatively good results in drug delivery. The cumulative percentage of drug release in phosphate-buffered solution at pH 7.4 was higher than that in buffered solution at pH 1.2. The release rate could be controlled by changing the pH of the releasing solution. Different captopril release behaviors were observed when the experiments were performed using a permeable dialysis membrane.
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Iranifam, Mortaza. "MOFs-, COFs- and MOGs-assisted chemiluminescence methods." Microchemical Journal 199 (April 2024): 110096. http://dx.doi.org/10.1016/j.microc.2024.110096.
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Kamal, W., Rehab Mahmoud, Abeer Enaiet Allah, Ahmed A. Farghali, Abdalla Abdelwahab, Dalal Hussien M. Alkhalifah, Wael N. Hozzein, Manar Bahaa El Din Mohamed, and Sahar Abdel Aleem Abdel Aziz. "Controlling Multi-Drug-Resistant Traits of Salmonella Obtained from Retail Poultry Shops Using Metal–Organic Framework (MOF) as a Novel Technique." Microorganisms 11, no. 10 (October 7, 2023): 2506. http://dx.doi.org/10.3390/microorganisms11102506.
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Salmonella spp. is considered one of the most important causes of food-borne illness globally. Poultry and its products are usually incriminated in its spread. Treatment with antibiotics is the first choice to deal with such cases; however, multi-drug resistance and biofilm formation have been recorded in animals and humans. This study aimed to detect the antibiotic profile of isolated traits from different sources and to find innovative alternatives, such as MOFs. A total of 350 samples were collected from randomly selected retailed poultry shops in Beni-Suef Province, Egypt. Their antimicrobial susceptibility against eight different antibiotics was tested, and multi-drug resistance was found in most of them. Surprisingly, promising results toward MOF were detected. Cu/Ni/Co-MOF (MOF3) showed superior antibacterial efficiency to Cu/Ni-MOF (MOF2) and Cu-MOF (MOF1) at p value ≤ 0.01. These findings highlight the tendency of Salmonella spp. to develop MDR to most of the antibiotics used in the field and the need to find new alternatives to overcome it, as well as confirming the ability of the environment to act as a source of human and animal affection.
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Laurikėnas, Andrius, Jurgis Barkauskas, and Aivaras Kareiva. "Synthesis and Characterization of Lanthanide Metal-Organic Frameworks with Perfluorinated Linkers." Advances in Science and Technology 98 (October 2016): 70–74. http://dx.doi.org/10.4028/www.scientific.net/ast.98.70.
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In this study, lanthanide elements (Ln3+) and 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylic acid (TFBDC) based metal-organic frameworks (MOFs) were synthesized by precipitation and diffusion-controlled precipitation methods. Powders insoluble in aqueous media and polar solvents were obtained. The microstructure and properties of Ln3+ MOFs were evaluated and discussed. X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and fluorescence spectroscopy (FLS) were carried out to characterize Ln3+ MOF's crystallinity, the microstructure, chemical composition and optical properties.
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Yao, Xiao-Qiang, Guo-Bin Xiao, Hua Xie, Dong-Dong Qin, Heng-Chang Ma, Jia-Cheng Liu, and Pen-Ji Yan. "Two triphenylamine-based luminescent metal–organic frameworks as a dual-functional sensor for the detection of nitroaromatic compounds and ofloxacin antibiotic." CrystEngComm 21, no. 15 (2019): 2559–70. http://dx.doi.org/10.1039/c8ce02122h.
Full textDissertations / Theses on the topic "MOFs"
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Heinke, Lars. "Diffusion in MOFs." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198185.
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Klimakow, Maria. "Metallorganische Gerüstverbindungen (MOFs)." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://dx.doi.org/10.18452/17097.
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In dieser Arbeit werden das Potential der mechanochemischen Synthesemethode zur Herstellung von metallorganischen Gerüstverbindungen (MOFs) vorgestellt und mögliche Anwendungsgebiete aufgezeigt. Im Forschungsfokus bezüglich schnellerer und effizienterer Darstellungsmethoden ist die Mechanochemie eine aussichtsreiche Alternative. Die Feststoff-Reaktion ist ohne die Verwendung von Lösungsmitteln durchführbar, zeichnet sich durch verkürzte Reaktionszeiten und quantitativen Eduktumsatz aus und gilt somit als Green Chemistry-Methode, die stetig wachsende Bedeutung erlangt. Die Ergebnisse dieser Arbeit belegen, dass über die mechanochemische Synthese metallorganische Verbindungen in allen Dimensionalitäten herstellbar sind. Die Reaktionsparameter sind auf die Herstellung isostruktureller und strukturanaloger Verbindungen übertragbar. Es wurden Synthesebedingungen identifiziert, die die Produktbildung beeinflussen, so dass ihre Kontrolle zur gezielten Herstellung verschiedener Verbindungen diente. Des Weiteren wurden Reaktionsparameter ermittelt, die einen Einfluss auf die Eigenschaften des Produkts ausüben. Im Hinblick auf eine größtmögliche spezifische Oberfläche wurde die Synthese optimiert und eine postsynthetische Aktivierungsprozedur entwickelt, die gemeinsam in einer verbesserten Gasadsorptionskapazität resultieren und auf andere Verbindungen übertragbar sind. Die Ergebnisse zur Gasspeicherung zeigen ein erstes Anwendungspotential für mechanochemisch synthetisierte MOFs auf, die als feine Pulver mit vergrößerter Oberfläche erhalten werden. Weiterhin wurde die Einlagerung von Solvensmolekülen in die Poren eines MOFs untersucht. Dabei zeigte sich, dass das MOF seine Gitterparameter an die jeweiligen Gastmoleküle anpasst. Das Potential zur Interkalation von Feststoffen wird anhand der Einlagerung pharmazeutischer Wirkstoffmoleküle belegt. Katalytische Untersuchungen zeigen eine gute Aktivität des mechanochemisch synthetisierten Rohprodukts.In this work the potential of mechanochemical synthesis to produce metal-organic frameworks (MOFs) is presented and possible applications for the materials are shown. In the focus of research regarding faster and more efficient methods of synthesis, mechanochemistry is an promising alternative. This solid-state reaction can be carried out without the use of solvent, exhibits shortened reaction times and a quantitative turnover of reactands. Therefore it is a method of green chemistry, and its importance is constantly increasing. The results show that mechanochemical synthesis is capable of producing metal-organic compounds in all dimensionalities. The reaction conditions can be transferred to synthesize isostructural and structural analogous compounds. Parameters influencing the formation of products were identified, and their control led to a well-aimed design of various compounds. In addition, conditions influencing the properties of the product were determined. In terms of a specific surface area as large as possible, the synthesis was optimized and a postsynthetic activation was developed, together resulting in an improved capacity for gas adsorption and transferrable to other compounds. The results concerning gas storage present one possible application of mechanochemically synthesized MOFs, that are produced as fine powders with enlarged surfaces. Furthermore, intercalation of solvent molecules in the pores of a MOF was investigated. It shows that the MOF adjustes its lattice paramters to the guest molecules. The potential to intercalate solid-state compounds is demonstrated using pharmaceutical drug molecules. Catalytic investigations show a good activity of the mechanochemically synthesized raw product.
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Albalad, Alcalá Jorge. "Post-Synthetic Modification of Metal-Organic Frameworks (MOFs) and Polyhedra (MOPs)." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/670090.
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Aquesta Tesi ha estat dedicada al disseny i implementació de noves tècniques de modificació post-sintètica (PSM) aplicades a material metal·loorgànics, principalment polímers de coordinació (CPs), xarxes metal·loorgàniques (MOFs) i políedres metal·loorgànics (MOPs), per tal de modificar les seves propietats fisicoquímiques a nivells inaccessibles a través de metodologies comuns de síntesi directa.
La Tesi comença oferint una breu recapitulació bibliogràfica del camp dels materials metal·loorgànics, des dels seus inicis fins a la seva aplicació actual i perspectives de futur. Aquest capítol engloba els conceptes més importants sobre la seva síntesi i modificació post-sintètica, tant en els seus nodes metàl·lics com en els lligands orgànics que construeixen les xarxes; amb un particular èmfasi en les tècniques post-sintètiques desenvolupades fins avui.
Seguidament, la tesi és dividida en quatre capítols extra, on cadascun d´ells s´enfoca en un procés de modificació post-sintètica concret. Inicialment, la Tesi es centra en la modificació post-sintètica de les subunitats metàl·liques de polímers de coordinació basats en lligand macrocíclics. La presència d´una font d´ions metàl·lics quelatats dins de la cavitat macrocíclica dels lligands indueix una transició de fase de monocristall a monocristall en contacte amb aigua, obtenint una distribució regular de subunitats; roda de paletes (paddlewheel); bimetàl·liques en la xarxa. Aquesta transició de fase és seguida a través de difracció de monocristall, així com a través de tècniques de caracterització espectroscòpiques i magnètiques.
Al següent capítol es postula una tècnica de modificació post-sintètica fins ara inexplorada en el camp dels materials metal·loorgànics. Gràcies a la seva microporositat intrínseca, els MOF poden difondre gasos altament reactius a través de la seva xarxa, el que pot induir potencialment una modificació post-sintètica a través de reaccions sòlid-gas en qüestió de minuts. Per tal de provar aquesta hipòtesi, un MOF decorat amb funcionalitats olefina es va fer reaccionar difonent ozó a través de la seva xarxa. El producte de reacció obtingut presenta clara evidència de tenir dins dels seus canals de reacció l´esperat intermedi de reacció per a la reacció d´ozonòlisi, teòricament inestable. Aquest intermedi pot ser convertit en un pas posterior a grups aldehid o àcid carboxílic de forma quimiselectiva. Tot el procés és caracteritzat per tècniques de ressonància magnètica nuclear (RMN) i difracció de monocristall.
Finalment, el coneixement adquirit en la modificació post-sintètica de CPs i MOFs es trasllada al camp dels materials zero-dimensionals. Concretament, aquesta Tesi demostra com políedres metal·loorgànics (MOPs) de rodi poden ser modificats en la seva perifèria a través de química de coordinació i covalent, modificant així les seves propietats fisicoquímiques (solubilitat) sense afectar a la seva integritat estructural. Aquesta modificació post-sintètica obra nous camins cap a l´explotació pràctica d´aquests materials, ja que degut a la seva estructura finita els MOPs poden ser vistos com nanopartícules estequiomètricament funcionalitzades amb solubilitat tuneable. Aquesta modificació post-sintètica permet a més introduït grups funcionals a la perifèria dels MOPs que no poden ser incorporats en síntesi directa. Així, a través d´un procés en dos passos, MOPs amb 24 grups amino o àcid carboxílic són sintetitzats. Ambdós grups presenten objectivament una de les químiques més riques en química covalent o de coordinació, respectivament, el que obra noves fronteres per a l´aplicació d´aquestes nanoplataformes.Esta Tesis ha sido dedicada al diseño e implementación de nuevas técnicas de modificación post-sintética (PSM) aplicadas a material metalorgánicos, principalmente polímeros de coordinación (CPs), redes metalorgánicas (MOFs) y poliedros metalorgánicos (MOPS) , a fin de modificar sus propiedades fisicoquímicas a niveles inaccesibles a través de metodologías comunes de síntesis directa. La Tesis comienza ofreciendo una breve recapitulación bibliográfica del campo de los materiales metalorgánicos, desde sus inicios hasta su aplicación actual y perspectivas de futuro. Este capítulo engloba los conceptos más importantes sobre su síntesis y modificación post-sintética, tanto en sus nodos metálicos como en los ligandos orgánicos que construyen las redes; con un particular énfasis en las técnicas post-sintéticas desarrolladas hasta la fecha. Seguidamente, la Tesis es dividida en cuatro capítulos extra, donde cada uno de ellos se enfoca en un proceso de modificación post-sintética concreto. Inicialmente, la Tesis se centra en la modificación post-sintética de las subunidades metálicas de polímeros de coordinación basados en ligando macrocíclicos. La presencia de una fuente de iones metálicos quelatados dentro de la cavidad macrocíclicos los ligandos induce una transición de fase de monocristal monocristal en contacto con agua, obteniendo una distribución regular de subunidades; rueda de paletas (paddlewheel) bimetálica en la red. Esta transición de fase es seguida a través de difracción de monocristal, así como a través de técnicas de caracterización espectroscópicas y magnéticas. En el siguiente capítulo se postula una técnica de modificación post-sintética hasta ahora inexplorada en el campo de los materiales metalorgánicos. Gracias a su microporosidad intrínseca, los MOF pueden difundir gases altamente reactivos a través de su red, lo que puede inducir potencialmente una modificación post-sintética a través de reacciones sólido-gas en cuestión de minutos. Para probar esta hipótesis, un MOF decorado con funcionalidades olefina se hizo reaccionar difundiendo ozono a través de su red. El producto de reacción obtenido presenta clara evidencia de tener dentro de sus canales de reacción del esperado intermedio de reacción para la reacción de ozonólisis, teóricamente inestable. Este intermedio puede ser convertido en un paso posterior a grupos aldehído o ácido carboxílico de forma quimiselectiva. Todo el proceso es caracterizado por técnicas de resonancia magnética nuclear (RMN) y difracción de monocristal. Finalmente, el conocimiento adquirido en la modificación post-sintética de CPs y MOFs se traslada al campo de los materiales cero-dimensionales. Concretamente, esta Tesis demuestra cómo poliedros metalorgánicos (MOPS) de rodio pueden ser modificados en su periferia a través de química de coordinación y covalente, modificando así sus propiedades fisicoquímicas (solubilidad) sin afectar a su integridad estructural. Esta modificación post-sintética obra nuevos caminos hacia la explotación práctica de estos materiales, ya que debido a su estructura finita los MOPS pueden ser vistos como nanopartículas estequiométricamente funcionalizadas con solubilidad tuneable. Esta modificación post-sintética permite además introducido grupos funcionales en la periferia de los MOPS que no pueden ser incorporados en síntesis directa. Así, a través de un proceso en dos pasos, MOPS con 24 grupos amino o ácido carboxílico son sintetizados. Ambos grupos presentan objetivamente una de las químicas más ricas en química covalente o de coordinación, respectivamente, lo que abre nuevas fronteras para la aplicación de estas nanoplataformas.
The disserted Ph.D. Thesis was dedicated to the design and implementation of new post-synthetic modification (PSM) techniques to porous metal-organic materials, namely Coordination Polymers (CPs), Metal-Organic Frameworks (MOFs) and Metal-Organic Polyhedra (MOPs), in order to modify their physicochemical properties to inaccessible levels by common direct synthesis methodologies. The Thesis starts offering a brief bibliographic review of the evolution of metal-organic materials field, from their beginnings up to their actual applications and future perspectives. This chapter presents the most relevant concepts in their synthesis and their potential PSM, both in the metallic nodes or in the organic linkers that assemble the framework; with particular emphasis on the post-synthetic methodologies exploited up to date. Next, the Thesis is divided in four extra Chapters, each of them corresponding to a specific post-synthetic modification process. Initially, the Thesis focuses on the post-synthetic modification of the metallic subunits of macrocycle-based CPs. The presence of a second source of metal ions quelated inside the macrocyclic cavity induces a single-crystal-to-single-crystal phase transition in contact with water, obtaining a regular distribution of bimetallic paddlewheel subunits within the framework. Such transition was studied by single-crystal X-Ray diffraction techniques, as well as spectroscopic and magnetic characterization techniques. Next, an unexplored pathway for the PSM of MOFs is postulated. Thanks to their nanoporous structure, MOFs can diffuse highly-reactive gases through their framework in order to modify their structure through solid-gas reactions in a matter of minutes. To this end, an olefin-tagged MOF is post-synthetically modified by diffusing ozone gas through the porous channels of the material. The as-obtained reaction intermediate can be chemoselectively converted to either aldehyde or carboxylic acid groups without affecting the crystalline integrity of the material. The whole two-step process is characterized by Nuclear Magnetic Resonance (NMR) techniques, as well as single-crystal X-Ray diffraction. Afterwards, the post-synthetic modification of metal-organic architectures is extended to zero-dimensional materials. Concretely, it is demonstrated how the surface functionalization of Rhodium (II)-based Metal-Organic Polyhedra, both through coordination or covalent chemistries, is able to tune their solubility within a wide range of solvents, without affecting the scaffold’s integrity. This post-modification opens up new pathways for exploiting these materials. Because of their finite structure, MOPs can be seen as stoichiometrically-functionalized nanoparticles with tunable solubility. Such acquired knowledge is then applied to expand the available roster of Rh(II)-based MOPs. Through a two-step protection/deprotection strategy, two unprecedented Rh-MOPs with 24 free carboxylate or amino groups on their periphery are synthesized, unobtainable by direct synthesis methodologies. Both groups arguably present one of the richest chemistries in coordination and covalent chemistry, respectively, thus opening new pathways and frontiers towards the application of these materials.
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Espín, Martí Jordi. "The photothermal effect in MOFs." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665204.
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Aquesta Tesi està dedicada a l’estudi de la interacció de la llum amb Polímers de Coordinació
(CPs) i Xarxes Metalorgàniques (MOFs). S’ha seguit dos camins per aconseguir aquest objectiu;
en primer lloc estudiant l’efecte fototèrmic observat en diferents subfamilies de MOFs, els quals,
un cop irradiats amb llum UV‐Vis, presenten un escalfament local. Aquest augment de
temperatura ha resultat útil tant en processos d’activació de MOFs com en Modificacions
Covalents Post‐Sintètiques (CPSM). Per altra banda, sintetitzant nous CPs seguint l’estratègia de
disseny de lligands fent servir complexos de coordinació de Ru2+‐terpiridines amb propietats de
captació de llum.
El Capítol 1 inclou una introducció general als CPs i MOFs, amb una visió històrica del seu
descobriment i evolució, així com algunes de les múltiples aplicacions en les que aquests
materials es poden implicar. En aquest sentit, ens hem centrat en les aplicacions que aprofiten
la llum com a estímul extern.
En el Capítol 2, hem resumit l’objectiu principal d’aquesta Tesi i n’hem detallat els objectius
parcials.
El Capítol 3 presenta una introducció als fonaments de la conversió de llum a calor en
diferents materials. Alguns exemples de composites de MOFs, on les nanopartícules demostren
un comportament fototèrmic, es troben resumits. Per altra banda també s’hi expliquen alguns
dels mètodes més emprats per evacuar molècules que obstrueixen els porus de MOFs
(activació). En aquest capítol es demostra que els MOFs també presenten efecte fototèrmic i
que aquest efecte es pot utilitzar per a activar‐los eliminant les molècules de dissolvent un cop
irradiats amb una làmpada UV‐Vis per temps curts.
En el Capítol 4, la Modificació Post‐Sintètica (PSM) de MOFs es resumeix basant‐se en les
interaccions entre l’esquelet del material porós i els agents modificants. També s’hi inclouen
algunes estratègies alternatives per realitzar aquestes transformacions. En aquest sentit, l’ús de
la calor local generada a partir de irradiar MOFs és utilitzada per aconseguir reaccions de CPSM.
MOFs amb funcionalitzacions amino que presenten un fort efecte fototèrmic i anhídrids o
aldehids es van mesclar (sense dissolvent) i la posterior exposició a llum UV‐Vis per temps curts
va afavorir la fusió dels reactius i la reacció covalent.
En el Capítol 5, les propietats d’absorció de llum i fototèrmiques d’alguns complexos
organometàl∙lics s’exemplifiquen. També s’hi descriu l’estratègia beneficiosa de confinar
aquests grups com a unitats estructurals en CPs i MOFs per a millorar la seva activitat. La síntesi
i caracterització de tres nous CPs construïts a partir de complexos de Ru2+‐terpiridina i ions
catalítics és descrita en aquest apartat. La caracterització fototèrmica d’aquests nous CPs
demostra que presenten temperatures màximes en el rang dels MOFs amb un efecte fototèrmic
més elevat. També es proposa realitzar un estudi dels CPs en reaccions de fotocatàlisi aprofitant
la disposició dels complexes de Ru i dels ions metàl∙lics en els nodes.This Thesis is devoted to the study of the interaction of light with Coordination Polymers (CPs) and Metal‐Organic Frameworks (MOFs). Two strategies have been followed to accomplish this objective. The first approach consisted on the study of the photothermal effect observed in different subfamilies of reported MOFs, which exhibited local heating upon UV‐Vis irradiation. Such temperature increase was proved useful for MOF activation and Covalent Post‐Synthetic Modification (CPSM) purposes. The second strategy was based on the synthesis of CPs following a ligand design approach using light‐harvesting Ru2+‐terpyridine complexes. Chapter 1 encloses a general introduction to CPs and MOFs, containing a historical overview of their discoveries and evolution, as well as some of the multiple applications in which these materials are involved. In this sense, we have focused on the applications arisen from the use of light as external stimulus. In Chapter 2, we have summarized the main objective of this Thesis and detailed the specific sub goals. Chapter 3 introduces the fundamentals of the light‐to‐heat conversion in different materials. Some examples of MOFs composites, where the nanoparticles exhibit the photothermal properties are reviewed. Moreover, a summary of some of the most common methods for removing guests from MOF pores (activation) is included. In this chapter, we demonstrate that MOFs also show photothermal effect and that this effect can be used to activate them by removing the solvent molecules after their irradiation with a UV‐Vis lamp for short periods. In Chapter 4, Post‐Synthetic Modification (PSM) of MOFs is reviewed based on the interactions between the framework and the desired modifying agents. To this end, some alternative strategies to perform such reactions are included. Thereafter, the use of the local heat generated upon MOF irradiation in CPSM reactions is reported. Amino‐tagged MOFs with strong photothermal effects and anhydrides or aldehydes were mixed (sovent‐free), and subsequent UV‐Vis exposure for short times allowed the melting of the reagents and the covalent reaction. In Chapter 5, the light‐harvesting and photothermal properties of some organometallic complexes are exemplified. The beneficial strategy of confining these moieties as building units in CPs and MOFs for enhancing their performance is described. The synthesis and characterization of three new CPs build up from Ru2+‐terpyridine complexes is reported here. Their photothermal characterization is performed and the new CPs showed maximum temperatures in the range of the MOFs with the strongest photothermal effect. In addition, future assessment of the CPs in photocatalytic reactions might be carried out, taking advantage of the close disposition of the Ru complexes and the metal ions of the nodes.
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Dai, Shan. "Synthèse ambiante verte de solides hybrides poreux (MOFs) robustes et de composites nanoparticules métalliques@MOFs." Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLE068.
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Les catalyseurs hétérogènes constituent une pierre angulaire de l'industrie chimique et sont l'une des technologies les plus cruciales pour un avenir durable. À cet égard, les matériaux hybrides représentent une direction très excitante pour le développement de catalyseurs innovants. L'incorporation de nanoparticules métalliques (MNPs) dans des réseaux hybrides poreux cristallisés appelés « Metal-Organic Frameworks » (MOFs) est une stratégie prometteuse pour préparer des catalyseurs hétérogènes très efficaces, combinant les propriétés à la fois du MOF hôte et des MNPs invitées. Les composites préparés présentent un grand potentiel pour plusieurs applications en dehors de la catalyse (par exemple, détection, bio-applications) car les matériaux invités encapsulés peuvent introduire de nouvelles propriétés souhaitées qui sont absentes/peu efficaces dans le matériau hôte. Dans cette thèse, les composites MNPs et MOFs ont été préparés grâce à une stratégie dite « bottle-around-ship », dans laquelle les MOFs sont assemblés dans une solution contenant des MNPs préformées pour fabriquer des structures cœur-coquille. Dans un premier temps, plusieurs approches ont été développées pour préparer à température ambiante des MOFs robustes à base de cations tétravalents, basées sur des approches séquentielles ou directes. Par la suite, ces approches de synthèse à température ambiante ont été adaptées pour incorporer des nanoparticules ultra-petites dans les MOFs afin de former de manière reproductible des composites cœur-coquille MNPs@MOF capables de relever plusieurs défis en catalyse hétérogène (réduction de CO2, hydrolyse de liaison peptidique…)Heterogeneous catalysts frame a cornerstone of the chemical industry and are one of the most crucial technologies for a sustainable future. Hybrid materials represent a very exciting direction for developing innovative catalysts. Incorporating guest metal nanoparticles (MNPs) into Metal-Organic Frameworks (MOFs) is an effective route to prepare highly efficient heterogeneous catalysts, which combines the properties of both the host MOF and guest MNPs. The prepared composites present a great potential for several applications apart from catalysis (e.g. sensing, bio-applications), as the encapsulated guest materials can introduce new desired properties that are absent/ poor in the parent material. In this thesis, MNPs and MOFs composites were prepared through challenging bottle-around-ship strategy. As the first step, multiple approaches were developed to prepare robust tetravalent Metal-organic frameworks (MOFs) at room temperature, including conventional stepwise and more facile direct strategies. Subsequently, the new room temperature synthesis approaches were adapted to incorporate ultra-small MNPs into the MOF to reproducibly form core-shell MNPs@MOF composites, prior to addressing several heterogeneous catalysis challenges (e.g., CO2 reduction, peptide hydrolysis)
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Morris, Samuel Alexander. "X-ray studies of zeolites and MOFs." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9891.
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This thesis is largely a study of the ADOR process (assembly-disassembly-organisation-reassembly) when applied to zeolite UTL. The final chapter of this thesis deals with the adsorption of the medical gases NO and CO onto the metal organic framework NiNaSIP. Chapter 4 is devoted to the disassembly and organisation steps of the ADOR process. Calcined UTL was hydrolysed using 0.1 – 12 M HCl solutions from 75 – 95 °C run over 10 mins to 72 hrs. A three step mechanism is proposed, which is comprised of an initial rapid hydrolysis that removes the majority of the interlayer constituents of UTL, causing the silica-rich layers to largely collapse. This is followed by a slow, temperature and molarity dependent, deintercalation process that sees the remainder of the interlayer material removed resulting in the full collapse of the layers to form IPC-1P. The third step is a temperature and molarity dependent rebuilding process, whereby the interlayer region is slowly rebuilt, eventually forming a precursor which upon calcination becomes IPC-2 (OKO). Chapter 5 uses the pair distribution function (PDF) technique to structurally confirm the intermediate of the ADORable zeolite UTL. The intermediate, IPC-1P, is a disordered layered compound formed by the hydrolysis of UTL in 0.1 M HCl. Its structure is unsolvable by traditional X-ray diffraction techniques. The PDF technique was first benchmarked against high-quality synchrotron Rietveld refinements of IPC-2 (OKO) and IPC-4 (PCR) – two end products of IPC-1P condensation that share very similar structural features. An IPC-1P starting model derived from density functional theory was used for the PDF refinement, which yielded a final fit of Rw = 18% and a geometrically reasonable structure. This confirms that the layers do stay intact throughout the ADOR process, and shows that PDF is a viable technique for layered zeolite structure determination. Chapter 6 examines the reassembly stage by following the in-situ calcination of a variety of hydrolysed intermediates into their three-dimensional counterparts. Beamline I11 at Diamond Light Source provided high-quality PXRD patterns as a function of temperature, which were refined against using sequential Pawley refinements to track the unit cell changes. 0.1, 1.75, 2.5 and 12 M hydrolysed lamellar precursor phases were calcined. The largest unit cell changes were observed for 0.1 M, and the smallest for 12 M. This shows that increasing the molarity must prebuild most of the interlayer connections, such that upon calcination, only minimal condensation occurs to fully connect the layers. Chapter 7 probes the uptake of the medical gases CO and NO into the metal organic framework NiNaSIP. An in-situ single-crystal XRD study was undertaken using an environmental gas cell at beamline 11.3.1 at the Advanced Light Source. NiNaSIP was first dehydrated to reveal an open nickel site, which acted as the main site of adsorption for the inputted gases. NO was observed in a bent geometry at an occupancy of 40 % and a Ni – N bond length of 2.166(16) Å. The oxygen was modelled to be disordered over two sites. CO was not fully observed, as only the carbon was able to be modelled with an occupancy of 31.2 % and a Ni – C bond length of 2.27(3) Å.
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Chen, Yipei. "Synthesis of MOFs for carbon capture application." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/55542/.
Full textAbstract:
The work in this thesis focuses on the synthesis of metal organic frameworks (MOFs) both in batch and continuous work. Improvements are made in both, compared to the previous research. Furthermore, post-modification experiments are conducted to advance the characteristics of end product. Also, their application as solid sorbents in carbon capture is investigated. In Chapter 1, the background of greenhouse gas emissions is reviewed and discussed, followed by the development of carbon capture technologies and different adsorbents used in post-combustion carbon capture. An introduction to metal organic frameworks is then presented, including a literature review of the research to date, and various synthesis methods including batch and continuous routes. The last part of this chapter presents a literature review on how pre-synthetic design and post-synthetic modification synthesis of MOFs can be achieved. The theories and introductions of the characterization techniques used in this thesis are discussed in detail in Chapter 2. Chapter 3 discusses a new batch method for the efficient synthesis of micro-sized HKUST-1 with high yield (84%) under mild conditions. Different activation methods are conducted in the washing process. Both ethanol and methanol are tested to remove the impurities in pores of the samples. Finally, the optimal sample of HKUST-1 achieved is shown to produce a relatively high surface area (1615 m2/g) with a CO2 adsorption of 8.1% (measured by TGA at 1 atm and 27 oC). A step increase in the surface area is made by immersing the powders into a solution consisting of NaCl, water and methanol. Nano scale HKUST-1 is synthesized by adding trimethylamine (TEA) solution with the organic ligand precursor. The reaction rate is accelerated with this case because TEA solution is able to deprotonate the trimesic acid (the organic ligand). The method for nano scale HKUST-1 synthesis is the focus of Chapter 4. Chapter 5 reports the continuous synthesis process of HKUST-1 and ZIF-8. This work builds on previous work at Nottingham. A counter-current Nozzle reactor is used in this work. The products were compared with commercial equivalents. Post-synthetic modification of HKUST-1 was made to improve the hydrophobicity of HKUST-1 to extend its resilience to breakdown in the presence of moisture. In Chapter 6, a hybrid material TiO2@ZIF-8 is synthesized using the same reactor. Different reactor configurations were also used to generate a range of different products that are then compared. To conclude, a summary of the work conducted in this thesis is presented in Chapter 7, followed by a discussion on potential future work.
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Heinke, Lars. "Diffusion in MOFs: the surface barrier phenomenon." Diffusion fundamentals 24 (2015) 19, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14533.
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Çamur, Ceren. "Advances on the synthesis of MOFs at scale." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667179.
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La presente tesis doctoral ha sido dedicada al desarrollo y optimización
de metodologías para la síntesis de MOFs en medio acuoso, así como su
conformación y el avance hacia la producción a gran escala de estos materiales.
El primer capítulo presenta una breve introducción a los materiales
porosos, empezando por los ejemplos presentes en la naturaleza, a los que luego
sigue una breve historia sobre los MOFs y sus principales aplicaciones. Se
prestará también especial atención a las metodologías usadas actualmente en la
síntesis a gran escala de MOFs y su posterior procesado.
El segundo capítulo presenta los objetivos, generales y específicos, de
esta tesis.
En el tercer capítulo se ilustra el uso de complejos metálicos de
acetilacetonato como precursores alternativos en la síntesis acuosa a baja
temperatura de varios MOFs, entre ellos MOFs basados en Zr, Fe y Al. Para
cada material (UiO-66-NH2, Zr-fumarato, UiO-66-(OH)2, UiO-66-(COOH)2,
MIL-88A y CAU-10), se definieron y optimizaron diversos parámetros
experimentales con el fin de aumentar el rendimiento y la calidad del material
final. Finalmente, se confirma la escalabilidad de esta metodología a través de
una síntesis optimizada a gran escala de UiO-66-NH2 en agua a temperatura
ambiente.
El cuarto capítulo demuestra el uso de la técnica de secado por
atomización, o ‘Spray Drying’, como un método “verde” y escalable para la
producción de Zr-MOFs en forma de cuentas esféricas. Se definirá la
importancia de diversos factores experimentales, y se demostrará su impacto en
la síntesis de UiO-66-NH2 y Zr-fumarato. Finalmente, la escalabilidad del
método será probada a través de una síntesis acuosa optimizada de UiO-66-NH2
a escala de gramos.
Finalmente, el capítulo final se estudia el proceso de estructuración de
varios MOF obtenidos con la técnica de ‘Spray Drying’ (HKUST-1 y UiO-66-
NH2) y de lotes de síntesis (UiO-66 y UiO-67) y su influencia en sus
propiedades de adsorción. Tras ser modelados en forma de pastilla a diferentes
presiones, se estudiaron sus nuevas propiedades mecánicas y de superficie.The present PhD Thesis has been dedicated to the development of basic knowledge on aqueous synthesis methodologies of MOFs and their shaping in order to make advances towards the large scale production of MOFs. The first chapter presents a brief introduction to the porous materials, starting with the examples from nature, which is then followed by a short history of MOFs and their main applications. Additionally, we pay special attention to the current methodologies that are performed for the synthesis of MOFs at scale and downstream processes. The second chapter consists of general and specific objectives of this Thesis. In the third chapter, the usage of metal acetylacetonate complexes as an alternative metal salt for the synthesis of MOFs is illustrated in water for several MOFs, including Zr-, Fe- and Al- based MOFs at low temperatures. For each MOF (UiO-66-NH2, Zr-fumarate, UiO-66-(OH)2, UiO-66-(COOH)2, UiO-66- COOH, MIL-88A and CAU-10), critical experimental parameters are defined and optimized to obtain high quality materials with high yields. Finally, the scalability of the methodology is shown with the gram scale synthesis of UiO- 66-NH2 by using optimized parameters in water at room temperature. The forth chapter demonstrates the continuous flow spray-drying technique that can be used as a green and scalable method to produce Zr-MOFs in the form of spherical beads. The influences of the important experimental factors are defined and the impact of those parameters on the synthesis of UiO- 66-NH2 and Zr-fumarate is shown. Finally, the scalability of the methodology is proven with the gram scale synthesis of UiO-66-NH2 by using optimized parameters in water. In the final chapter, the shaping process of the several MOFs that were synthesized by the spray-drying (HKUST-1 and UiO-66-NH2) and batch (UiO- 66 and UiO-67) synthesis methodologies is demonstrated. Mild pelletization technique is used to shape the MOFs into tablets to study textural and mechanical properties.
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Graham, Alexander John. "Effect of pressure on metal-organic frameworks (MOFs)." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8900.
Full textAbstract:
A growing field of research has evolved around the design and synthesis of a variety of porous metal-organic framework (MOF) materials. Some of the most promising areas for which these materials are potentially useful candidates include gas-separation, heterogeneous catalysis, and gas-storage, and all of these applications involve placing the MOF under pressure. There is clearly a need to understand the structural response of MOFs to applied pressure. Nevertheless, hitherto there are very few published investigations dedicated to determining the behaviour of porous hybrid materials under pressure. Through the use of high-pressure single-crystal X-ray diffraction studies, a series of MOF materials have been studied. Here we present the effect of pressure on a series of MOFs. In chapter 2, the effect of pressure on the prototypical MOF called MOF-5 was studied experimentally from ambient pressure to 3.2 GPa. Here, application of pressure was driven by the hydrostatic medium being forced into the pores of the MOF, which altered the mechanical properties of MOF-5, in particular, medium inclusion delayed the onset of amorphization. Complementary computational analysis was also performed to elucidate further the effect of medium inclusion on compressive behaviour. Detailed structural data was also collected as a function of pressure on the MOF Cu-btc. Application of pressure caused solvent to be squeezed into the pores (like MOF-5) until a phase transition occurred, driven by the sudden compression and expansion of equatorial and axial Cu–O bonds. High-pressure post-synthetic modification of a MOF is reported for the first time. On application of pressure of 0.2 GPa to the Cu-based MOF called STAM-1, a ligand exchange reaction takes place resulting in a change in pore size, shape, and hydrophilicity of the resulting pores. Here, we also demonstrate the ability to force hydrophilic molecules into hydrophobic pores using pressure, counteracting the hydrophobic effect. A high-pressure combined experimental and computational study has been carried to probe the effect of pressure on ‘breathing’ mechanisms in a zeolitic imidazolate framework (or ZIF) called ZIF-8. The penetration of guest molecules and the accommodation of pressure are shown to be inextricably linked to the rotation of methylimidazolate groups in the structure. Finally, the application of pressure to the MOF Sc₂BDC₃ and the nitro functionalized derivative Sc₂(NO₂-BDC)₃ was also studied. Here, the effect of chemical modification of the organic ligand, whilst maintaining framework topology, has been investigated as it pertains to compressibility. Directionality of compression is observed and this is rationalized with respect to the framework topology and medium inclusion/exclusion.
Books on the topic "MOFs"
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Kumar, Pawan, Naresh Kumar, and Deepak Kumar Aneja, eds. Metal Organic Framework (MOFs). Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5971-2.
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Gulati, Shikha, ed. Metal-Organic Frameworks (MOFs) as Catalysts. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7959-9.
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Blay, Vincent, Luis Francisco Bobadilla, and Alejandro Cabrera, eds. Zeolites and Metal-Organic Frameworks. NL Amsterdam: Amsterdam University Press, 2018. http://dx.doi.org/10.5117/9789462985568.
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Zeolites are natural or synthetic materials with porous chemical structures that are valuable due to their absorptive and catalytic qualities. Metal-Organic Frameworks (MOFs) are manmade organometallic polymers with similar porous structures. This introductory book, with contributions from top-class researchers from all around the world, examines these materials and explains the different synthetic routes available to prepare zeolites and MOFs. The book also highlights how the substances are similar yet different and how they are used by science and industry in situations ranging from fueling cars to producing drugs.
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Guilloton, Noëlle. Mots pratiques mots magiques. Sainte-Foy, Qué: Gouvernement du Québec, 1997.
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S, Gross, ed. Moms, moms, moms: A mirthful merriment of cartoons. New York: Harper & Row, 1990.
Find full textBook chapters on the topic "MOFs"
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Hajizadeh, Zoleikha, and Mohammad Mehdi Salehi. "MOFs Bandstructure." In Physicochemical Aspects of Metal-Organic Frameworks, 79–90. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18675-2_6.
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Navalón, Sergio, and Hermenegildo García. "MOFs as Photocatalysts." In Metal-Organic Frameworks, 477–501. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527809097.ch15.
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Cepeda, Javier, Antonio Rodríguez-Diéguez, and Alfonso Salinas-Castillo. "Biosensing Using MOFs." In Metal-Organic Frameworks in Biomedical and Environmental Field, 457–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63380-6_14.
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Salehi, Mohammad Mehdi, Farhad Esmailzadeh, and Fereshte Hassanzadeh-Afruzi. "Applications of MOFs." In Physicochemical Aspects of Metal-Organic Frameworks, 197–305. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18675-2_13.
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Rahimi, Jamal, and Fatemeh Ganjali. "Industrialization of MOFs." In Physicochemical Aspects of Metal-Organic Frameworks, 307–25. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18675-2_14.
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Kamalzare, Maryam. "MOFs Functionalization Approaches." In Physicochemical Aspects of Metal-Organic Frameworks, 45–59. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18675-2_4.
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Zarei-Shokat, Simindokht, Fatemeh Ansari, Mohadeseh Forouzandeh-Malati, and Ana Zamani. "MOFs Structural Morphologies." In Physicochemical Aspects of Metal-Organic Frameworks, 61–77. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18675-2_5.
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Yu, Hao, and Yonghai Cao. "Carbon from MOFs." In Carbon Catalysis, 403–27. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003545248-9.
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Schwartz, Heidi Annemarie, and Uwe Ruschewitz. "Photoactive Molecules within MOFs." In Structure and Bonding, 105–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/430_2020_56.
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Zito, Pasquale F., Adele Brunetti, Alessio Caravella, Enrico Drioli, and Giuseppe Barbieri. "Membranes Based on MOFs." In Metal-Organic Frameworks, 223–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527809097.ch8.
Full textConference papers on the topic "MOFs"
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Ostresh, Sarah, James Nyakuchena, Daniel Streater, Denan Wang, Claire Cody, Reagan Hooper, Xiaoyi Zhang, et al. "Optical Pump THz Probe Spectroscopy on Metal-Organic Frameworks." In CLEO: Fundamental Science, FW4I.3. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_fs.2024.fw4i.3.
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Optical Pump THz Probe (OPTP) Spectroscopy is an outstanding technique to understand photoconductivity in emerging materials. We utilized OPTP to explore the photoconductivity in porous crystalline metal-organic frameworks (MOFs). MOFs are highly porous and their properties can be adjusted by synthesize and chemical composition, making them an tool box for advanced ultralight electro-optical applications. These applications are limited by the insight into the underlying photophysics in MOFs. Our OPTP results revealed ultrafast photoconductivity. We were able to understand the influence of different metal centers in two types of MOFs and OPTP results agreed with catalytical activity measurements and demonstrate that the catalysis in this material is more determined by photoconductivity than by “common” catalytic chemistry wisdom.
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Al-Ansari, Dana E., Nura A. Mohamed, Isra Marei, Huseyin Yalcin, and Haissam Abou-Saleh. "Assessment of Metal Organic Framework as Potential Drug Carriers in Cardiovascular Diseases." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0127.
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Background: Cardiovascular diseases (CVDs) are considered the major cause of death worldwide. Therapeutic delivery to the cardiovascular system may play an important role in the successful treatment of a variety of CVDs, including atherosclerosis, ischemic-reperfusion injury, and microvascular diseases. Despite their clinical benefits, current therapeutic drugs are hindered by their short half-life and systemic side effects. This limitation could be overcome using controlled drug release with the potential for targeted drug delivery using a nanomedicine approach. In the current study, we have assessed the use of a highly porous nano-sized preparation of iron-based Metal-organic Framework (MOF) commonly referred to as MIL-89 as potential drug carriers in the cardiovascular system. Aims: To assess the effect of MOFs on the viability and cytotoxicity of human vascular cells and the cellular uptake in vitro, and the organ-system toxicity of MOF in vivo using the Zebrafish model. Methods: Human pulmonary endothelial cells (HPAECs) and pulmonary smooth muscle cells (HPASMCs) were treated with variable concentrations of MOFs. The viability, cytotoxicity and anti-inflammatory effects were measured using AlamarBlue, LDH assay and ELISA. The cellular uptake of MOFs were assessed using light, confocal, and transmission electron microscopes and EDS analysis. Moreover, Zebrafish embryos were cultured and treated with MOFs-nanoparticles at 0 hours post fertilization (hpf) followed by different organ-specific assays at 24, 48, and 72 hpf. Results: Although MOFs affect the viability at high concentrations, it does not cause any significant cytotoxicity on HPAECs and HPASMCs. Interestingly, MOFs were shown to have an anti-inflammatory effect. Microscopic images showed an increased (concentration-dependent) cellular uptake of MOFs and transfer to daughter cells in both cell types. Moreover, the in vivo study showed that high concentrations of MOFs delay zebrafish embryos hatching and cause heart deformation, which is currently investigated using cardiotoxicity markers. Conclusion: MOFs is a promising nanoparticle prototypes for drug delivery in the cardiovascular system with high cellular uptake and anti-inflammatory effects. Further investigations of MOFs, including diseased models and drug- loaded formulation is required.
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Arayachukiat, Sunatda, Taradon Pironchart, and Kanokwan Kongpatpanich. "The Versatile and Tunable Metal-Organic Framework MOF for Condensate Decontamination." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31664-ms.
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Abstract Contamination of heavy metals especially for Mercury (Hg) and Arsenic (As) in condensates becomes one of major concerns in Natural Gas production due to theirs high toxicity and carcinogenicity. The key challenge to develop adsorbents for Hg/As removal is to find suitable porous materials with high adsorption capacity, long-term stability and easy to handle the toxic wastes after the adsorption process. Metal-organic frameworks (MOFs) are one of promising porous materials constructed from metal clusters and organic linkers to create the 3D framework structures. MOFs are one of the promising adsorbents for removal of Hg/As from condensates owning to their versatile structures, tunable porosity, and tailorable chemical functionalities. In this work, Zr-based MOFs have been developed for dual removal of Hg and As species owning to their chemical stability in moisture conditions, which is highly desirable for industrial processes. Zr-based MOFs with different topology and pore size distribution have been synthesized for Hg/As adsorption to understand the contribution of porous structure on the removal of Hg/As species in condensates. The performance of Zr-based MOFs results showed Hg and As removal up to 99.5% in condensates from several petroleum sources. The removal efficiencies were found to be influenced by topology of MOF adsorbents and the speciation of Hg/As in different petroleum sources. In addition, Zr-based MOFs have proposed some future trends and challenges of porous material that can be used as an alternative to the conventional metal oxides and zeolites.
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Cruz, A. J., I. Parrella, G. Wenz, J. Storey, and J. Husk. "Innovative Molecular Sponges: Next-Generation Direct Air Capture Technology Enabled by Metal-Organic Frameworks." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216660-ms.
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Abstract Direct air capture (DAC) is an engineered atmospheric carbon dioxide (CO2) removal technology aimed at mitigating climate change impacts, as emphasized by the United Nations Framework Convention for Climate Change (UNFCCC). With only a limited number of currently deployed units globally, DAC technology is still at its embryonic stage. To improve its acceleration, the DAC system needs to be tackled holistically – including but not limited to (1) sorbent selection and performance improvement, (2) scaling of manufacturing from laboratory to industrial segments, and (3) integration of the engineered contactor design. Metal-organic frameworks (MOFs), with their interesting properties, such as record-breaking specific surface areas, crystallinity, and chemical versatility, are identified as one of the most promising materials for solid DAC applications. Baker Hughes recently acquired Mosaic Materials to scale its next-generation DAC technology. In this work, Mosaic's breakthrough will be used as a case study, building on its proprietary MOF, process optimization, and engineering design, and the journey from lab-scale work to systems-level programs. Policy, sustainability, and knowledge-sharing will play critical roles as prime agents to accelerate DAC deployment enabled by advanced materials such as MOFs.
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Jenks, J. J., Ward Tegrotenhuis, Radha K. Motkuri, Brian K. Paul, and B. Peter McGrail. "A Computational and Experimental Study of Metal and Covalent Organic Frameworks Used in Adsorption Cooling." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48822.
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Metal-organic frameworks (MOFs) have recently attracted enormous interest over the past few years due to their potential applications in energy storage and gas separation. However, there have been few reports on MOFs for adsorption cooling applications. Adsorption cooling technology is an established alternative to mechanical vapor compression refrigeration systems. Adsorption cooling is an excellent alternative in industrial environments where waste heat is available. Applications also include hybrid systems, refrigeration, powerplant dry cooling, cryogenics, vehicular systems and building HVAC. Adsorption based cooling and refrigeration systems have several advantages including few moving parts and negligible power consumption. Key disadvantages include large thermal mass, bulkiness, complex controls, and low COP (0.2–0.5). We explored the use of metal organic frameworks that have very high mass loading and relatively low heats of adsorption, with certain combinations of refrigerants to demonstrate a new type of highly efficient adsorption chiller. An adsorption chiller based on MOFs suggests that a thermally-driven COP>1 may be possible with these materials, which would represent a fundamental breakthrough in performance of adsorption chiller technology. Computational fluid dynamics combined with a system level lumped-parameter model have been used to project size and performance for chillers with a cooling capacity ranging from a few kW to several thousand kW. In addition, a cost model has been developed to project manufactured cost of entire systems. These systems rely on stacked micro/mini-scale architectures to enhance heat and mass transfer. Presented herein are computational and experimental results for hydrophyilic MOFs, fluorophilic MOFs and also flourophilic Covalent-organic frameworks (COFs).
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Kamikawaji, Ms Ayaka, and Prof Kosuke Sugawa. "Enhancement of UC Quantum Yield by Combining Metal-Organic Frameworks (MOFs) and Localized Surface Plasmon Resonance(LSPR)." In 6th World Conference on Chemistry and Chemical Engineering and 6th World Conference on Advanced Materials, Nanoscience and Nanotechnology, 19. Eurasia Conferences, 2024. https://doi.org/10.62422/978-81-974314-2-5-006.
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The triplet-triplet annihilation upconversion (TTA-UC) phenomenon holds great potential for various applications, as it not only converts long-wavelength light into shorter wavelengths but can also be driven by low photon density light, such as sunlight. For practical implementation, achieving TTA-UC in a solid-state system with high stability is desirable. However, performance degradation is inevitable due to the loss of molecular diffusion in solid-state environments. To address this, a method utilizing exciton diffusion instead of molecular diffusion has been explored. This approach employs metal-organic frameworks (MOFs), which prevent the molecular aggregation that would otherwise hinder exciton diffusion, while also allowing dense molecular accumulation, creating a structure that enables the development of high-performance systems. However, during MOF synthesis, structural defects have been observed, leading to the trapping and deactivation of excitons nearby, which significantly reduces the fluorescence quantum yield. To mitigate this issue, we explored the use of localized surface plasmon resonance (LSPR) with metal nanoparticles. The integration of metal nanoparticles with molecules is known to reduce fluorescence lifetime due to the enhancement of electric fields, a phenomenon known as the Purcell effect. This effect improves the fluorescence quantum yield of MOFs and could potentially result in high TTA-UC quantum yields even in solid-state systems.
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Korsakova, E. A., N. A. Muftahitdinova, L. V. Zhukova, and A. S. Korsakov. "Tapered-core silver halide MOFs." In 2020 International Conference Laser Optics (ICLO). IEEE, 2020. http://dx.doi.org/10.1109/iclo48556.2020.9285512.
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Garai, Mousumi, Manmatha Mahato, and Il-Kwon Oh. "MXene MOFs for electroactive artificial muscles." In Electroactive Polymer Actuators and Devices (EAPAD) XXV, edited by John D. Madden, Iain A. Anderson, and Herbert R. Shea. SPIE, 2023. http://dx.doi.org/10.1117/12.2660365.
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Wang, John. "Engineering of MOFs and MOF-derived Materials for Energy and Water Technologies." In THE 3rd INTERNATIONAL CONFERENCE ON THEORETICAL AND APPLIED NANOSCIENCE AND NANOTECHNOLOGY. Avestia Publishing, 2019. http://dx.doi.org/10.11159/tann19.5.
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Beltrán-Mejía, Felipe, Enrique Silvestre, and Pedro Andrés. "Modeling Radiation Losses in Microstructured Optical Fibers for Sensing Applications." In Workshop on Specialty Optical Fibers and their Applications. Washington, D.C.: Optica Publishing Group, 2008. http://dx.doi.org/10.1364/wsof.2008.ps149.
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We have incorporated perfectly matched layers (PMLs) into our iterative Fourier modal method to tackle radiation losses in microstructured optical fibers (MOFs). For the inclusion of PMLs, first we have adapted our numerical procedure both to handle conductive and absorptive anisotropic materials and to search directly for the eigenvalues that are close to a certain fixed value. Secondly, we have designed a novel type of cylindrical PMLs in which the conductivity increases radially, suiting quite well with the fiber radiation modes. The description of the PMLs as an anisotropic material has allowed us to use a different coordinate system to describe either the 2D wave equation or the PMLs themselves. Once the calibration process of the PMLs is successfully ended, radiation losses can be estimated accurately. Finally, this technique is applied to model radiation losses for specialty MOFs used for sensing applications.
Reports on the topic "MOFs"
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Ingram, Conrad, and Dinadayalane Tandabany. Engineering Accessible Adsorption Sites in MOFs for CO2 Capture. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1582449.
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Ingram, Conrad, and Dinadayalane Tandabany. Engineering Accessible Adsorption Sites in MOFs for CO2 Capture. Office of Scientific and Technical Information (OSTI), October 2019. http://dx.doi.org/10.2172/1571173.
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Fujimoto, Meghan S., Amy K. Welty, Mitchell Greenhalgh, and Troy G. Garn. Developing an Engineered Form of MOFs CaSDB and HKUST –1. Office of Scientific and Technical Information (OSTI), March 2019. http://dx.doi.org/10.2172/1503605.
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Yaghi, Omar M. Metal-organic and zeolite imidazolate frameworks (MOFs and ZIFs) for highly selective separations. Office of Scientific and Technical Information (OSTI), September 2012. http://dx.doi.org/10.2172/1050881.
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Mohamed, Eddaoudi, Michael Zaworotko, Brian Space, and Juergen Eckert. Design and Synthesis of Novel Porous Metal-Organic Frameworks (MOFs) Toward High Hydrogen Storage Capacity. Office of Scientific and Technical Information (OSTI), May 2013. http://dx.doi.org/10.2172/1150238.
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Thallapally, Praveen K., and Denis M. Strachan. Initial proof-of-principle for near room temperature Xe and Kr separation from air with MOFs. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1122332.
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Alakoski, Susanna. Moas stafettpinne. Linköping University Electronic Press, August 2023. http://dx.doi.org/10.3384/9789179295882.
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Jag är uppvuxen i ett brandgult hyreshus. Så många ord jag från början inte förstod. Inte ens visste om att de fanns. Till exempel ordet humanism. Trots att jag är en person som sovit i sängar skänkta av Lions och har en mamma som använde kyrkans barnverksamhet som barnvakt...
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Bringué, M. Marine oil spill studies (MOSS). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/314908.
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Hamermesh, Daniel. Moms’ Time—Married or Not. Cambridge, MA: National Bureau of Economic Research, January 2021. http://dx.doi.org/10.3386/w28317.
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Rock, M. C. Communications: The Tale of Two MOSs. Fort Belvoir, VA: Defense Technical Information Center, February 2009. http://dx.doi.org/10.21236/ada510348.
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