Relevant bibliographies by topics / Microwave-heating assisted solvothermal synthesis

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  2. Dissertations / Theses
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Academic literature on the topic 'Microwave-heating assisted solvothermal synthesis'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Microwave-heating assisted solvothermal synthesis"

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Blanita, Gabriela, Gheorghe Borodi, Mihaela D. Lazar, Alexandru-Radu Biris, Lucian Barbu-Tudoran, Ioan Coldea, and Dan Lupu. "Microwave assisted non-solvothermal synthesis of metal–organic frameworks." RSC Advances 6, no. 31 (2016): 25967–74. http://dx.doi.org/10.1039/c5ra26097c.

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Liu, Xiaoying, Bozhi Tian, Chengzhong Yu, Bo Tu, and Dongyuan Zhao. "Microwave-Assisted Solvothermal Synthesis of Radial ZnS Nanoribbons." Chemistry Letters 33, no. 5 (May 2004): 522–23. http://dx.doi.org/10.1246/cl.2004.522.

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Kesuma, Ruth Febriana, Aep Patah, and Yessi Permana. "Microwave-Assisted Synthesis of DUT-52 and Investigation of Its Photoluminescent Properties." Bulletin of Chemical Reaction Engineering & Catalysis 14, no. 1 (April 15, 2019): 124. http://dx.doi.org/10.9767/bcrec.14.1.2369.124-129.

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A zirconium metal-organic framework (MOF) of DUT-52 (DUT: Dresden University of Technology) was synthesized herein by reacting zirconium tetrachloride (ZrCl4) and 2,6-naphthalenedicarboxylic acid (H2NDC) in DMF under microwave heating at 115 oC for 25 min. This synthetic procedure was more efficient than a solvothermal method, by which a long thermal exposure (24 h) of 100-150 oC was required to produce the same MOF. The MOF has a thermal stability of 560 °C, prior to partial loss of interconnected 2,6-naphthalenedicarboxylate (NDC) linkers at some structure building units (SBU). Crystallinity of this DUT-52 was ca. 77 %, which was the same as one synthesized solvothermally. Diffuse Reflectance UV-Vis spectra revealed an absorption at λex of 287 nm, which was equivalent to a bandgap energy of 4.32 eV. Electron excitations of this DUT-52 at 275 and 300 nm gave emission wavelength of 433 nm (a purple region), indicating a prospective use of DUT-52 as a photoluminescent material. Copyright © 2018 BCREC Group. All rights reservedReceived: 20th January 2018; Revised: 28th September 2018; Accepted: 30th September 2018; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Kesuma, R.F., Patah, A., Permana, Y. (2019). Microwave-Assisted Synthesis of DUT-52 and Investigation of Its Photoluminescent Properties. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 124-129 (doi:10.9767/bcrec.14.1.2369.124-129)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.2369.124-129
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Lai, Li Sze, Yin Fong Yeong, Kok Keong Lau, and Mohd Shariff Azmi. "Fast Synthesis of Highly Crystalline ZIF-8 Using Microwave-Assisted Solvothermal Method." Applied Mechanics and Materials 773-774 (July 2015): 1133–37. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1133.

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This paper presents the formation of highly crystalline ZIF-8 using microwave-assisted solvothermal method. The crystallinity of the ZIF-8 particles was characterized using X-ray diffraction. The lattice vibrations of the structure in the ZIF-8 framework were determined through Fourier transforms infrared spectroscopy. The morphology of the ZIF-8 particles was observed through scanning electron microscopy. The results showed that, 0.5 hour was sufficient for the formation of highly crystalline ZIF-8 particles using microwave-assisted solvothermal method under temperature 120 oC.
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Lu, Qingyi, Feng Gao, and Sridhar Komarneni. "Microwave-assisted synthesis of one-dimensional nanostructures." Journal of Materials Research 19, no. 6 (June 2004): 1649–55. http://dx.doi.org/10.1557/jmr.2004.0237.

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A microwave-assisted solvothermal method was used for the synthesis of selenium nanorods. The obtained selenium nanorods have axis ratios higher than 100 with their diameters in the range of 30–150 nm. This method is quite simple, rapid, adjustable, and general. Besides the effects of the experimental parameters on the synthesis of the selenium nanorods, the generality of this method has also been investigated, by which other one-dimensional nanostructures, metal lead and semiconductor cadmium sulfide nanorods, were also successfully synthesized.
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Christé, Esteves da Silva, and Pinto da Silva. "Evaluation of the Environmental Impact and Efficiency of N-Doping Strategies in the Synthesis of Carbon Dots." Materials 13, no. 3 (January 21, 2020): 504. http://dx.doi.org/10.3390/ma13030504.

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The efficiency and associated environmental impacts of different N-doping strategies of carbon dots (CDs) were evaluated. More specifically, N-doped CDs were prepared from citric acid via two main synthesis routes: Microwave-assisted hydrothermal treatment with addition of N-containing small organic molecules (urea and ethylenediamine (EDA)); and microwave-assisted solvothermal treatment in N-containing organic solvents (n,n-dimethylformamide (DMF), acetonitrile and pyridine). These syntheses produced CDs with similar blue emission. However, XPS analysis revealed that CDs synthesized via both hydrothermal routes presented a better N-doping efficiency (~15 at.%) than all three solvothermal-based strategies (0.6–7 at.%). However, from the former two hydrothermal strategies, only the one involving EDA as a nitrogen-source provided a non-negligible synthesis yield, which indicates that this should be the preferred strategy. This conclusion was supported by a subsequent life cycle assessment (LCA) study, which revealed that this strategy is clearly the most sustainable one from all five studied synthesis routes.
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Shen, Yue-Qin, Ying-Jie Zhu, Fei-Fei Chen, Ying-Ying Jiang, Zhi-Chao Xiong, and Feng Chen. "Antibacterial gluey silver–calcium phosphate composites for dentine remineralization." Journal of Materials Chemistry B 6, no. 30 (2018): 4985–94. http://dx.doi.org/10.1039/c8tb00881g.

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Jangu, Surendra, Biraj Kanta Satpathy, Mula Raju, Chacko Jacob, and Debabrata Pradhan. "Synthesis of V-shaped MnO2 nanostructure and its composites with reduced graphene oxide for supercapacitor application." Dalton Transactions 50, no. 20 (2021): 6878–88. http://dx.doi.org/10.1039/d1dt00422k.

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ZHANG, J., W. QIN, J. ZHANG, Y. WAN, C. CAO, Y. JIN, G. WEI, G. WANG, and L. WANG. "Microwave-assisted Solvothermal Synthesis of YF3:Yb3+, Tm3+ Nanobundles." Chemical Research in Chinese Universities 23, no. 6 (November 2007): 733–35. http://dx.doi.org/10.1016/s1005-9040(07)60159-7.

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Guo, Zhanjun, and Zhiliang Chen. "Microwave-assisted solvothermal synthesis and performances of LiMn0.7Fe0.3PO4 nanoplates." Materials and Manufacturing Processes 33, no. 8 (August 30, 2017): 813–16. http://dx.doi.org/10.1080/10426914.2017.1364754.

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Dissertations / Theses on the topic "Microwave-heating assisted solvothermal synthesis"

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Castanet, Uli. "Contribution à l’étude des systèmes nanostructurés CeO2, Au et Au/CeO2." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0600/document.

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Les nanomatériaux sont de plus en plus utilisés dans de nombreusesapplications, que cela soit pour la catalyse, la coloration, l’optique, etc. Pour optimiser leurutilisation, il est nécessaire de mieux comprendre les réactions et interactions ayant lieu à ceséchelles. Cette thèse se propose d’essayer d’explorer les liens entre conditions de synthèse,morphologie de particules, et propriétés de celles-ci. En particulier, nous avons opté pourl’étude d’un matériau modèle : l’oxyde de cérium (IV). Les nanoparticules de CeO2 ont étéobtenues par voie de synthèse solvothermale assistée par chauffage micro-ondes. Lesmorphologies des nanoparticules de CeO2 étudiées ont été : les cubes, les octaèdres et lesbâtonnets, et nous avons essayé de fournir une explication à leur obtention par la voie desynthèse utilisée. De l’or a ensuite été déposé en surface des ces nanoparticules de CeO2 etétudié par une combinaison d’études par Microscopie Électronique en Transmission et demodélisations numériques
Nanomaterials are more and more used in various situations, such as catalysis,color, optics, etc. To optimize their use, it is necessary to better understand reactions andinteractions taking place at these scales. This PhD thesis aims at exploring the links betweensynthesis conditions, particle morphology and their properties. In particular, we chose a tostudy a model-material: cerium (IV) oxide. CeO2 nanoparticles have been obtained bymicrowave-heating assisted solvothermal synthesis. Morphologies obtained and studied havebeen: cubes, octahedrons and rods. We tried to to give an explanation on how these synthesesallowed the formation of such morphologies. Gold has then be deposed on the surface of theseCeO2 nanoparticles, and studied by a combination of Transmission Electron Microscopystudies, and computer modelizations
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Panov, Nikita. "Microwave-Assisted Solvothermal Synthesis and Optical Characterization of M(RE)F4 (M – Alkali Metal; RE – Rare-Earth Metal) Nano- and Microscale Particles." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40590.

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Interest in rare-earth-doped crystalline materials, e.g., M(RE)F4 (M – alkali metal, RE – rare-earth metal), featuring unique optical properties such as light upconversion and downshifting is experiencing a surge due to the broad spectrum of applications that these photonic systems are facilitating. The development of reliable synthetic methods that grant rapid access to these materials is therefore of great importance. Microwave-assisted synthesis is appealing in this regard, because microwave radiation enables rapid and uniform heating of the reaction mixture and allows for rigid control of the reaction conditions, factors that facilitate the production of high-quality materials within minutes. Surprisingly, the investigation around microwave-assisted synthesis of M(RE)F4 materials featuring upconversion and downshifting luminescence is limited. Methods that have already been developed predominately target Na-based systems, despite the evidence that the Li-based analogues also display excellent optical properties. In fact, only a single microwave-assisted approach toward a nanoscale Li-based system has been reported to date, while to my knowledge, no report of a microwave-assisted synthesis of a microscale Li-based system existed prior to the commencement of the work presented in this thesis. The challenge lies in the fact that access to Li(RE)F4 is not easily achieved through a simple substitution of the alkali metal source in the established protocols that yield Na(RE)F4; rather, a complete re-optimization of the synthesis method is required. This particular challenge was successfully addressed in this work. Presented and discussed in Chapter 3 of this thesis is a rapid microwave-assisted solvothermal synthesis approach toward both upconverting and downshifting LiYF4:RE3+ microparticle systems. More specifically, it is detailed how the rigorous optimization of the reaction temperature/duration profile, initial reaction mixture pH, and ratio of the metal precursors was necessary in gaining control over the crystalline phase, morphology, and size of the microparticles under microwave-induced solvothermal conditions. Importantly, a materials growth mechanism involving the depletion of a Li-free crystal phase, followed by a particle ripening process is also proposed. Moreover, the versatility of the developed method is highlighted by showcasing how it can be extended toward the synthesis of other relevant Li- and Na-based M(RE)F4 nano- and microscale materials (i.e., LiYbF4, NaYF4, and NaGdF4) featuring upconversion luminescence. Lastly, potential challenges associated with microwave-assisted synthesis are discussed, and appropriate solutions are proposed. The upconversion and downshifting luminescence of the M(RE)F4 materials attained via the developed synthesis approach is investigated in Chapter 4. The first part of the chapter provides a general assessment of the characteristic luminescence generated by the M(RE)F4 materials featuring various RE3+ dopant systems. The second part of the chapter is devoted to a much more thorough single-particle investigation of the anisotropic luminescence behaviour exhibited by the LiYF4:RE3+ microparticles via hyperspectral imaging, polarized emission spectroscopy, and optical trapping. It is my hope that you, the reader, will find the work presented in this thesis stimulating from two vantage points – from the development of the most rapid microwave-assisted solvothermal synthesis of upconverting and downshifting M(RE)F4 nano/microscale materials reported to date, as well as from the utilization of specialized luminescence characterization techniques to provide fundamental insight into a seldom-considered luminescence property of crystalline materials such as LiYF4.
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Brown, Treva T. "Fabrication and Characterization of Intricate Nanostructures." ScholarWorks@UNO, 2017. https://scholarworks.uno.edu/td/2399.

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Encapsulation of nanoparticles within hexaniobate nanoscrolls presents interesting advances in the formation of nanocomposites exhibiting unique multi-dimensional properties. Building upon previous successes, facile yet versatile wet-chemical and microwave-irradiation synthetic protocols for the fabrication of a series of hexaniobate composites are presented herein. Solvothermal and, more recently, microwave-assisted methods have been developed that allow for the fabrication of peapod-like structures. During solvothermal treatment, exfoliated hexaniobate nanosheets scroll around highly ordered chains of preformed nanoparticles (NPs) to produce nanopeapods (NPPs). This approach offers versatility and high yields, in addition to the potential for advanced functional device fabrication. For the characterization of these materials, advanced techniques in atomic force microscopy (AFM) were used for investigating the surface of materials at the nanometer scale. Extensive physical, dynamic, and force modulation studies were performed on novel oxide nanocomposites by implementing particular scanning techniques to determine information such as topology, stress-induced behavior at the nanoscale, magnetic behavior, and frictional forces of the nanoscale materials. These composites were then analyzed by topological intermittent contact studies in tapping and contact mode, as well as with derivative techniques of these commonly used scanning probe approaches. In addition to studying surfaces using conventional modes of AFM, the mechanical properties of these nanocomposites were measured via dynamic lateral force modulation (DLFM) and magnetic properties of functionalized magnetic nanosheets were mapped via magnetic sampling modulation (MSM). By utilizing the capabilities of the DLFM imaging mode, elastic properties such as Young’s Modulus were measured from force-distance curves. In addition to this modulation mode, MSM was used to selectively map the vibrating magnetic nanomaterials from a modulated electromagnetic field. The information obtained from these AFM techniques can be helpful in determining the relative structural behavior of these nanocomposites and gauge their use in various applications such as structural engineering of nanoarchitectures as well as studying magnetic characteristics of metal oxide nanocomposites that exhibit characteristics different from their bulk counterparts.
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Guzzetta, Fabrizio. "Rationale Design of Up-Converting Nanoparticles Towards Advanced Optical Applications." Doctoral thesis, Universitat Jaume I, 2018. http://hdl.handle.net/10803/662815.

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The thesis aims to shed some light on the massive production of up-converting nanocrystals through solvothermal conditions. Solvothermal route allows to prepare larger quantities of these nanomaterials, as compared to normal glassware-based routes, and increase yield of nanomaterials per synthesis. The synthetic route was optimized through thorough analysis of several parameters Then, the produced nanomaterials were used to propose new optical applications in both biological (encapsulation of the nanomaterials within vesicles based on glicolypids under different pH conditions) and technological fields (the solids were entrapped within a soft-matter matrix that, under a critical temperature, underwent a sol-gel transition and permitted in a low-temperature range (below water boiling point) the modulation of matrix emissions). Lastly a microwave - assisted synthesis was studied, as alternative to solvothermal route, to understand the formation of up-converting nanocrystals, which allowed a versatile post-synthetic coating for further applications of the crystals.
La tesis abarca un problema general de producción a gran escala de los nanomateriales. Condiciones solvotermales permiten optimizar el rendimiento de producción de materiales, y por lo tanto esta ruta de síntesis ha sido elegida para su producción masiva. El proceso ha sido optimizado a través el analísis de diferentes parametros de reacción. Se han producido también aplicaciones ópticas avanzadas tanto en ámbito biológico (atrapando los sólidos en vesiculas preparadas por medio de glicolípidos a diferente pH) cuanto en ámbito tecnologico (los solidos venián atrapados en sistemas fibrilares que a raíz de una temperatura critica en la transición sol-gel permitía modulación de las emisiones de la matríz órganica). En fin se ha estudiado y analizado la formación de sistemas cristalinos por medio de la sintesis a microondas, como sistema alternativo al solvotermal, que ha resultado en la formación de nanorods con posibilidad de recubrimiento post-síntesis.
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Ludwig, Jennifer [Verfasser], Tom [Akademischer Betreuer] Nilges, Richard [Gutachter] Fischer, Richard [Gutachter] Weihrich, Tom [Gutachter] Nilges, and Hubert A. [Gutachter] Gasteiger. "Conventional and Microwave-Assisted Solvothermal Synthesis, Characterization, and Optimization of the High-Voltage Cathode Material LiCoPO4 for Lithium-Ion Batteries / Jennifer Ludwig ; Gutachter: Richard Fischer, Richard Weihrich, Tom Nilges, Hubert A. Gasteiger ; Betreuer: Tom Nilges." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/116792620X/34.

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Siu, Wing Kwan May 1979. "Applications and microwave assisted synthesis of poly(ethylene glycol) modified Merrifield resins." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82427.

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A microwave assisted methodology was developed to modify Merrifield resins (1-2% cross-linked containing 1.0-3.5 mmol Cl-/g) with different nominal molecular weights PEG (200-1000). The synthesis was also carried out by conventional heating to assess the differences between the two procedures. The most efficient synthesis was achieved by using microwave and by using PEG with molecular weight 200 and MR 2% crosslinked containing 1.25 mmol Cl -/g. The structural elucidation was carried out using Fourier transform infrared (FTIR) spectroscopy and elemental analyses. Upon pyrolsis-GC/MS analysis of the PEGylated MR, the PEG showed the tendency to undergo thermal degradation by the loss of a smaller PEG fragments. This observed degradation of PEG was less prominent during microwave assisted synthesis compared to conventional heating, in addition to faster reaction rates and higher yields. As expected, the PEGylated MR showed improved swelling properties in polar solvents. The chemical reactivity of the PEGylated Merrifield resin was confirmed by the esterification with pyruvic acid and by the substitution of hydroxyl group using thionyl chloride. In addition, the PEGylated MR was converted into (1) polymer-supported acid/base or redox indicator by the attachment of a blue organic dye - 2,6-dichloroindophenol (DCIP) through a nucleophilic substitution reaction and (2) beta-cyclodextrin trap, a water insoluble inclusion-complex, by immobilization of beta-cyclodextrin through cross-linking with 1,6-hexamethylene diisocyanate reagent.
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Liao, Xiangjun 1970. "Dielectric properties and their application in microwave-assisted organic chemical reactions." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38220.

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This study was designed to develop some predictive models for the dielectric properties of the chemicals and chemical reactions and make use of dielectric properties and microwave irradiation in the chemical reactions. Specifically, the dielectric properties of the following systems were investigated at microwave frequencies of 2450 and 915 MHz: (1) C1--C5 alcohols, (2) glucose aqueous solutions, (3) lysine aqueous solutions, (4) mimicked esterification reaction model systems of parahydroxybenzoic acid with methanol, 1-propanol and 1-butanol in the presence of para-toluene sulfonic acid as a catalyst, (5) Maillard reaction model system consisting of glucose, lysine and water.
The dielectric properties of the model systems showed that they depended on the frequency applied, concentration of the material, and temperature. Most of the predictive models showed that there exists a linear or quadratic relationship between dielectric constant and concentration or temperature. However, the quadratic equation is better than the linear one to describe the variation of the loss factor with temperature or concentration.
Esterification showed great advantages for the use of microwave irradiation in chemical reaction. It included reduction in reaction time, and provided distinct temperature profiles due to microwave environment during chemical reactions. The reason for rate enhancement of this type of reaction was also demonstrated from the temperature profile.
Microwave-assisted solvent free Maillard reaction model system, consisting of glucose and lysine, demonstrated that the heating method applied was not one of the crucial factors, but the temperature level was important during the chemical reaction.
The relationship of loss factor with yield of reaction showed that it is possible to use dielectric data to analyze, and monitor the chemical reaction. It provided a new methodology to analyze the reaction.
The relationship between the loss factor, loss tangent and the reaction time, and concentration of the material showed that it is also possible to use dielectric data at microwave frequencies of 2450 and 915 MHz to study chemical reactions, especially the kinetics.
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Dai, Jianming. "Microwave-assisted extraction and synthesis studies and the scale-up study with the aid of FDTD simulation." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100342.

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The research undertaken in this thesis includes microwave-assisted extraction (MAE), synthesis, and the investigation of the scale-up of the microwave-assisted processes with the numerical aid.
The main goal of this research is to study the various problems associated with the scale-up of the microwave-assisted extraction and synthesis processes. Laboratory studies were carried out to investigate the microwave-assisted extraction of known components from peppermint leaves and American ginseng. Various factors that influence the extraction processes were studied. Microwave-assisted extraction method was compared with conventional heating and room temperature extraction methods on the extraction of ginsenosides from American ginseng. Microwave-assisted extraction method was determined to have higher extraction rate than both room temperature extraction and reflux temperature extraction using hotplate heating indicating that there is acceleration factor in enhancing the extraction rate beyond the temperature influence.
In the study of synthesizing n-butyl paraben, microwave-assisted synthesis was observed to greatly increase the yield of n-butyl paraben in much shorter period of time compared to the classic synthesis method. A transition state theory was proposed to explain this rate enhancement. The study of the synthesis of parabens with different alcohol and the influencing factors on the synthesis of n-butyl paraben yield were also studied.
A visualization method was developed to determine the microwave distribution in a domestic microwave cavity. The method uses gypsum plate as carrier and cobalt chloride as indictor. A simulation program was developed using the finite difference time domain (FDTD) approach and written in C programming language. The program was proved to be very versatile in different type of cavity simulation. Not only cavities with different dimensions and geometrical designs can be simulated, multiple magnetrons and various ways of magnetron placement can also be integrated into the simulation program. The detailed power distribution can be visualized in a 3-D plot, and the power distribution in each layer can be analyzed using the simulation result. The power distribution information will be very useful and necessary before any real equipment development.
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Pradal, Nathalie. "Synthèses, mise en forme et caractérisations de luminophores nanostructurés pour une nouvelle génération de dispositifs d'éclairage sans mercure." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00775908.

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Le marché de l'éclairage est un marché de masse à diffusion large en pleine mutation face aux nouvelles contraintes environnementales. Il s'inscrit dans une démarche de préservation de l'environnement avec une volonté européenne de voir sa consommation énergétique réduite de 20% d'ici 2020. Les luminophores jouent un rôle prépondérant dans les performances des systèmes d'éclairage utilisant comme sources d'excitations des LEDs bleues ou UV, ou encore un plasma (Xe-Ne), où ils permettent de convertir les photons incidents (VUV, UV ou bleus) en lumière visible. Dans le cadre de cette thèse, nous nous sommes intéressés à la production de lumière blanche. Pour obtenir une couleur la plus proche du blanc idéal et répondant aux mieux au cahier des charges de l'éclairage domestique, une amélioration des performances des luminophores utilisés classiquement est nécessaire. Au cours de ces travaux nous avons porté notre attention sur deux aluminates de formulations Y3Al5O12 dopé Ce3+ (YAG :Ce) et BaMgAl10O17 dopé Eu2+ (BAM :Eu). L'aspect novateur repose d'une part sur la synthèse de ces luminophores sous forme de nanoparticules par des voies de synthèse originales (la voie solvothermale et la combustion assistée par micro-ondes respectivement) et d'autre part sur leur mise en forme (revêtements composites " luminophores/polymère "). Plusieurs techniques expérimentales (DRX, IR, Mössbauer, aimantation, MEB, MET,...) ont été utilisées afin de caractériser leurs propriétés structurales et morphologiques. L'étude des performances optiques de ces luminophores enregistrées sous excitations bleue, UV et/ou VUV nous a permis de mettre en évidence leur utilisation potentielle dans les nouveaux dispositifs d'éclairage : associés à d'autres luminophores (rouge pour le YAG :Ce; rouge et vert pour le BAM :Eu) en proportions adéquates, il est possible de générer de la lumière blanche présentant les propriétés escomptées.
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Feral-Martin, Cédric. "Influence de la morphologie d’oxydes à base de cérium sur les relations (micro)structures/propriétés." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14076/document.

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Les oxydes à base de Cérium, ont fait l’objet de nombreuses études ces dernières décennies et se sont révélés des matériaux de choix, dans le domaine de la catalyse hétérogène. L’objectif à l’heure actuelle, est donc d’accroître la réactivité de ces oxydes, tout en élargissant leur gamme de températures optimales d’utilisation. Dans ce contexte particulier, il semble possible de moduler les propriétés des oxydes à base de cérium en contrôlant la morphologie des cristallites. Ce travail de thèse a donc été consacré à la détermination, l’élaboration et à la caractérisation de matériaux oxydes à base de cérium de morphologies contrôlées. Nous avons tout d’abord déterminé cristallographiquement et thermodynamiquement les morphologies accessibles au système étudié puis par traitement hydrothermale assistée par chauffage micro-ondes nous avons synthétisé les dites morphologies. Après caractérisation de la réactivité par ATG et thermographie Infrarouge nous avons optimisé ces matériaux par un dopage extrinsèque tout d’abord (dépôt de métaux précieux), puis par un dopage intrinsèque ensuite (Yttrium et Fer). Enfin, l’obtention de morphologies non accessibles cristallographiquement nous a amené à approfondir le(s) processus de germination croissance de ces particules et la forte réactivité des matériaux dopés fer nous a poussé à une caractérisation fine de la microstructure de ces matériaux. Au final nous avons pu corréler l’influence de la morphologie des cristallites sur la réactivité propre de l’ensemble des familles de matériaux étudiés
Recent decades, numerous studies on cerium-based oxides have been realized and have revealed that cerium-based oxides were materials of choice in the field of heterogeneous catalysis. The aim now is therefore to increase the reactivity of these oxides, while expanding their range of optimal temperatures of Use. In this particular context, it seems possible to modulate the properties of cerium-based oxides by controlling the morphology of the crystallites. This thesis has been devoted to the identification, development and characterization of materials based on cerium oxides of controlled morphology. We first determined possible morphologies for the studied system, by hydrothermal synthesis by micro-wave assisted heating we have synthesized these morphologies and we characterized reactivity of these materials by infrared thermography and TGA. We have optimized these materials first, by extrinsic doping (deposition of precious metals) and then by intrinsic doping (Yttrium and Iron). New morphologies have been synthesized so we have studied the processes of nucleation-growth set in. The high reactivity of iron-doped materials has led us to a detailed characterization of the microstructure of these materials. Finally correlation reactivity/morphologies of crystallites have been achieved
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Books on the topic "Microwave-heating assisted solvothermal synthesis"

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Microwave-assisted organic synthesis: A green chemical approach. Oakville, ON: Apple Academic Press Inc., 2015.

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Kappe, C. Oliver, and Erik van der Eycken. Microwave-Assisted Synthesis of Heterocycles. Springer, 2014.

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Erik Van der Eycken (Editor) and C. Oliver Kappe (Editor), eds. Microwave-Assisted Synthesis of Heterocycles (Topics in Heterocyclic Chemistry). Springer, 2006.

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Book chapters on the topic "Microwave-heating assisted solvothermal synthesis"

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Misra, Isha, Riya Parikh, Alisa Chakraborty, Yogeshwar R. Suryawanshi, and Mousumi Chakraborty. "Synthesis of Ruthenium Nanoparticles by Microwave Assisted Solvothermal Technique." In Materials, Energy and Environment Engineering, 51–57. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2675-1_6.

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"13. Microwave-assisted solvothermal synthesis of inorganic compounds (molecular and non molecular)." In Microwave Chemistry, 225–47. De Gruyter, 2017. http://dx.doi.org/10.1515/9783110479935-013.

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Chen, Xiaoxin, Wenfu Yan, Jihong Yu, Xuejing Cao, and Ruren Xu. "Rapid synthesis and morphology control of silicalite-1 crystals by microwave-assisted solvothermal synthesis." In From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 432–37. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80872-x.

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Guiotoku, Marcela, Carlos Rambo, Claudia Maia, and Dachamir Hotz. "Synthesis of carbon-based materials by microwave-assisted hydrothermal process." In Microwave Heating. InTech, 2011. http://dx.doi.org/10.5772/20089.

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Tu, Shu-Jiang, and Bo Jiang. "Microwave-Assisted Domino Reaction in Organic Synthesis." In Advances in Induction and Microwave Heating of Mineral and Organic Materials. InTech, 2011. http://dx.doi.org/10.5772/13858.

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Jha, Anjali. "Microwave Assisted Synthesis of Organic Compounds and Nanomaterials." In Nanofibers - Synthesis, Properties and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98224.

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In the Conventional laboratory or industry heating technique involve Bunsen burner, heating mental/hot plates and electric heating ovens. To produce a variety of useful compounds for betterment of mankind, the Microwave Chemistry was introduced in year 1955 and finds a place in one of the Green chemistry method. In Microwave chemistry is the science of applying microwave radiation to chemical reactions. Microwaves act as high frequency electric fields and will generally heat any material containing mobile electric charges, such as polar molecules in a solvent or conducting ions in a solid. Polar solvents are heated as their component molecules are forced to rotate with the field and lose energy in collisions i.e. the dipole moments of molecules are important in order to proceed with the chemical reactions in this method. It can be termed as microwave-assisted organic synthesis (MAOS), Microwave-Enhanced Chemistry (MEC) or Microwave-organic Reaction Enhancement synthesis (MORE). Microwave-Assisted Syntheses is a promising area of modern Green Chemistry could be adopted to save the earth.
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V., Oxana, Boris I., and Ubaldo Ortiz. "Microwave-Assisted Synthesis of Coordination and Organometallic Compounds." In Advances in Induction and Microwave Heating of Mineral and Organic Materials. InTech, 2011. http://dx.doi.org/10.5772/13149.

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Predoana, Luminita, Dániel Attila Karajz, Vincent Otieno Odhiambo, Irina Stanciu, Imre M. Szilágyi, György Pokol, and Maria Zaharescu. "Influence of the Microwaves on the Sol-Gel Syntheses and on the Properties of the Resulting Oxide Nanostructures." In Microwave Heating [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94931.

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Among the chemical methods in the liquid phase, the sol–gel technique is a versatile and efficient method for pure or doped metal oxide films or powders preparation, showing some advantages over other preparation techniques (high homogeneity, the possibility to introducing dopants in large amount, low processing temperature and control over the stoichiometry). Combining the sol–gel (SG)method with the effect of ultrasounds(US) or microwaves (MW) leads to improving the sol–gel procedure. The microwave-assisted sol–gel method is most frequently used for obtaining nanocrystalline, monodispersed oxide nanoparticles, or to transform amorphous gels into well-crystallized nanopowders. Less studied is the influence of the microwaves on the sol–gel reactions in solutions. The benefit of using microwave-assisted sol–gel preparation highly depends on the reagents used and on the composition of the studied systems. In the present chapter, results on the influence of the microwaves on the chemical reactions that take place during the sol–gel synthesis and on the properties of the resulted samples are discussed.
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Marganakop, Sheetal, Pramod Kattimani, Sudha Belgur Satyanarayana, and Ravindra Kamble. "Microwave Synthesized Functional Dyes." In Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94946.

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Microwave chemistry involves the application of microwave radiation to chemical reactions and has played an important role in organic synthesis. Functional dyes are those with hi-tech applications and this chapter attempts to provide an overview of the recent developments in microwave-assisted synthesis of functional dyes. Emphasis has been paid to the microwave-assisted synthesis of dye molecules which are useful in hi-tech applications such as optoelectronics (dye-sensitized solar cells), photochromic materials, liquid crystal displays, newer emissive displays (organic-light emitting devices), electronic materials (organic semiconductors), imaging technologies (electrophotography viz., photocopying and laser printing), biomedical applications (fluorescent sensors and anticancer treatment such as photodynamic therapy). In this chapter, the advantages of microwaves as a source of energy for heating synthesis reactions have been demonstrated. The use of microwaves to functional dyes is a paradigm shift in dye chemistry. Until recently most academic laboratories did not practice this technique in the synthesis of such functional dyes but many reports are being appeared in the journals of high repute.
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Saleh, Tawfik A., Shafquat Majeed, Arunima Nayak, and Brij Bhushan. "Principles and Advantages of Microwave-Assisted Methods for the Synthesis of Nanomaterials for Water Purification." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 426–39. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch020.

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Nanomaterials are the pillars of nanoscience and nanotechnology and to realize their full potential in various potential applications, synthetic methodologies/routes need to be established that are simple, fast and cost-effective. Wet-chemical approaches for nanomaterial synthesis have proven to be among the most versatile and effective routes to finely tailor nanocrystals with varying compositional and architectural complexity. Microwave-assisted solution route represents an efficient wet-chemical approach for the synthesis of nanomaterials that offers additional advantages, such as rapid volumetric heating, high reaction rates, size and shape control by tuning reaction parameters, and energy efficiency. In addition, the homogenous heating of the reactants in microwave synthesis minimizes thermal gradients and provides uniform nucleation and growth conditions that leads to the formation of nanomaterials with uniform size distribution. This chapter deals with the basics of microwave chemistry and its applications towards the synthesis of nanomaterials for catalytic applications.
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Conference papers on the topic "Microwave-heating assisted solvothermal synthesis"

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Matras-Postolek, Katarzyna, A. Zaba, S. Sovinska, and D. Bogdal. "Microwave-assisted preparation of ZnS and ZnSe nanocrystals with different morphologies for photodegradation process of organic dyes." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9998.

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Zinc sulphide (ZnS) and zinc selenide (ZnSe) and manganese-doped and un-doped with different morphologies from 1D do 3D microflowers were successfully fabricated in only a few minutes by solvothermal reactions under microwave irradiation. In order to compare the effect of microwave heating on the properties of obtained nanocrystals, additionally the synthesis under conventional heating was conducted additionally in similar conditions. The obtained nanocrystals were systematically characterized in terms of structural and optical properties using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV-Vis spectroscopy (DR UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area analysis. The photocatalytic activity of ZnSe, ZnS, ZnS:Mn and ZnSe:Mn nanocrystals with different morphologies was evaluated by the degradation of methyl orange (MO) and Rhodamine 6G (R6G), respectively. The results show that Mn doped NCs samples had higher coefficient of degradation of organic dyes under ultraviolet irradiation (UV).
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Kumar, Sushil, Satyendra Singh, Sumit Bera, Vinay Kaushik, Hasan Afzal, and R. Venkatesh. "One pot facile synthesis of selenium nanostructures by microwave assisted solvothermal process." In PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098674.

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Singh, Satyendra, Sumit Bera, Hasan Afzal, Vinay Kaushik, M. M. Patidar, and R. Venkatesh. "Influence of sulphur doping in snse nanoflakes prepared by microwave assisted solvothermal synthesis." In PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098662.

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Kumar, Sushil, Sumit Bera, Vinay Kaushik, Satyendra Singh, M. Krishnan, Mohan Gangrade, D. Kumar, and R. Venkatesh. "Facile and fast, microwave assisted solvothermal synthesis of Sb2Se3 nanostructures for thermoelectric applications." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017553.

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da Costa, Amanda Pereira dos Santos, YURI VINICIUS BRUSCHI DE SANTANA, and Ana Paula de Moura. "Influence of synthesis parameters on barium titanate structural properties obtained by microwave assisted solvothermal method." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-0437.

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Hagiwara, Kenta, and Satoshi Horikoshi. "Rapid Synthesis of highly luminescent Carbon Quantum Dots using Low-Pressurized Microwave Solvothermal Heating." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9784.

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Since the first serendipity of carbon quantum dots (CQDs)1, it is expected to be used for imaging materials for reusable living bodies (e.g. Hela cells). However, the reported CQDs synthetic methods have yet to be at the practical levels; the quantum yields is low, and synthetic condition is over 5 hrs under more than 30 atms. In this research, we ameliorated the problems of CQDs synthesis and luminescence (quantum yields) by the novel synthesis protocol using microwave chemistry. Specifically, we synthesized high quantum yields CQDs (61%) by utilizing a microwave chemical synthesis, synthesizing at low pressure condition (lower than 5 atom) and short reaction time (3 hrs). The achievement of this high quantum yields made it clear that the contribution of polyethylene glycol (PEG) shell to CQDs is large. It was confirmed from the DLS and TEM image that the particle size of the synthesized particles was 8 to 13 nm (Fig. 1). On the other hand, the relationship between the polymerization degree of added PEG and the quantum yields to the addition amount is summarized in Table 1. The quantum yields of CQDs without addition of PEG was 16.7 %, while it was improved at 61.1 % when 0.6 g of PEG6000 (Molecular weight: 6000) was added.We succeeded in remarkably improving the quantum yields by using PEG, which is usually used as a protective agent, as a shell. By using this method, we succeeded in improving the quantum yields of the existing report by approximately 3 times. From the surface modified structure of PEG, the mechanism of improvement of quantum yields will be considered.[1] X. Xu et al., J. Am. Chem. Soc., 2004, 126, 12736–12737.
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Liu, Qianqian, Pengli Zhu, Gang Li, Qian Guo, Xingtian Shuai, Rong Sun, and Chingping Wong. "A microwave-assisted solvothermal process to synthesize Al-doped ZnO powders and its optical and electrical properties." In 2016 17th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2016. http://dx.doi.org/10.1109/icept.2016.7583177.

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Tioni, Estevan, and Pascal Rousseaux. "BRINGING TOGETHER MICROWAVE ASSISTED SYNTHESIS AND CHEMICAL ENGINEERING PRINCIPLES." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9901.

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It is nowadays admitted that microwaves are frequently used in organic chemistry labs [1] (even if not as much as it was predicted 20 years ago, one must say [2]). On the other side it is also certain that this technology has not yet found its place in chemical industry: application at a production scale are very scarce [3][4] and this despite the potential advantages of the technology (selective heating, high heating rate, low thermal inertia…). The point is that mastering all the aspects of microwaves assisted synthesis at industrial scale demands a lot of different skills to work together: chemistry, process engineering, microwave engineering, materials science. This is so challenging that tools and methodologies for quantification of industrial microwave interest and scaling-up of lab results are missing. In this work we present our contributions to the deployment of microwaves for synthesis in the chemical industry which are mainly The development of small pilot reactors (1 L) in stainless steel, capable to withstand temperature and pressureThe application of a chemical engineering methodology to microwave assisted synthesisAn example of intensification (see table) of an industrially interesting reaction using microwave to access NPW (high temperature and pressure)A tentative of rationalization of process criteria to identify a priori the interest of microwave heating for a specific application [1]. Diaz-Ortiz et al., Chem. Rec. 2019, 19, 85–97 [2]. Kappe, Chem. Rec. 2019, 19, 15–39 [3]. Aldivia, brevet WO2004/066683A1 [4]. https://cen.acs.org/articles/94/i36/Microwaving-ton.html
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Malewicz, Miroslaw, Michal Byrczek, and Helena Teterycz. "Synthesis of zinc oxide nanotiles by wet chemical route assisted by microwave heating." In 2009 32nd International Spring Seminar on Electronics Technology (ISSE). IEEE, 2009. http://dx.doi.org/10.1109/isse.2009.5206934.

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Fiedor, Pawel, Joanna Ortyl, and Mariusz Galek. "MICROWAVE-ASSISTED SYNTHESIS AND SPECTROSCOPIC PROPERTIES OF NOVEL PYRIDINE-BASED FLUORESCENT MOLECULAR PROBES." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9829.

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Fluorescent molecular probes become interesting analytical tools in determination and labeling of chemical compounds and physical properties such as viscosity and polarity. Currently known fluorescent molecular probes can selectively and regardless of the environment detect only few molecules, and applicability in determination of micro- viscosity and micro-polarity are limited to narrow range and specific condition, therefore design and synthesis of novel molecular probes with extended range of operation are highly needed [1]. Traditional synthesis of 2-amino-4,6-diphenyl-pyridine-3-carbonitrile’s requires two step reaction with long heating time or and toxic solvent. By application of microwave irradiation, reaction time can be firmly shortened with the same or higher efficiency [2]. Derivatives of 2-amino-4,6-diphenyl-pyridine-3-carbonitrile can find application in different fields of science. Depending on the structure of fluorophore, those compounds exhibit high sensitivity to changes in polarity and viscosity of environment, also concentration of specific cations, and pH can be determined by measuring of fluorescence spectrum.
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