Journal articles: 'Synthèse hydrothermale'

1

El Malki, E., B. Manohar, A. Davidson, P. Massiani, S. Sivasanker, and M. Che. "Incorporation du vanadium dans l'architecture zéolithique β : caractérisation d'échantillons obtenus par synthèse hydrothermale ou réaction solide-solide." Journal de Chimie Physique 94 (1997): 1848–58. http://dx.doi.org/10.1051/jcp/1997941848.

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Bassez, Marie-Paule. "Synthèse prébiotique dans les conditions hydrothermales." Comptes Rendus Chimie 12, no. 6-7 (June 2009): 801–7. http://dx.doi.org/10.1016/j.crci.2008.10.013.

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Jagminas, Arūnas, Arnas Naujokaitis, Paulius Gaigalas, Simonas Ramanavičius, Marija Kurtinaitienė, and Romualdas Trusovas. "Substrate Impact on the Structure and Electrocatalyst Properties of Molybdenum Disulfide for HER from Water." Metals 10, no. 9 (September 17, 2020): 1251. http://dx.doi.org/10.3390/met10091251.

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It is expected that utilization of molybdenum disulfide (MoS2)-based nanostructured electrocatalysts might replace the Pt-group electrodes most effectively applied for hydrogen evolution reaction from water. Therefore, in the past two decades, various approaches have been reported for fabrication of nanostructured MoS2-based catalysts, but their applications in practice are still missing due to lower activity and stability. We envisaged that the knowledge about the peculiarities of MoS2 nanoplatelets attachment to various conductive substrates by hydrothermal processing could be helpful for fabrication of more active and stable working electrodes. Therefore, in this study, the hydrothermal syntheses at the Mo, Ti, Al, anodized Ti, and hydrothermally designed titanium suboxide substrates were performed; the electrodes obtained were characterized; and hydrogen evolution reaction (HER) activity was tested. In this way, MoS2-based HER catalyst possessing a surprising stability and a low Tafel slope was designed via attachment of nanoplatelet-shaped MoS2 species to the nanotube-shaped anatase-TiO2 surface.

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Weitkamp, Jens, Stefan Ernst, and Rajiv Kumar. "Zeolith ZSM-12: Hydrothermale Synthese und katalytische Eigenschaften." Chemie Ingenieur Technik 59, no. 2 (February 1987): 135–37. http://dx.doi.org/10.1002/cite.330590211.

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Schüßler, Christian, Martin Zürn, Thomas Hanemann, and Michael Türk. "Überwachung der kontinuierlichen hydrothermalen Synthese mittels Impedanzspektroskopie." Chemie Ingenieur Technik 94, no. 3 (December 2, 2021): 281–88. http://dx.doi.org/10.1002/cite.202100146.

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Türk, Michael. "Design metalloxidischer Nanopartikel mittels kontinuierlicher hydrothermaler Synthese." Chemie Ingenieur Technik 90, no. 4 (January 26, 2018): 436–42. http://dx.doi.org/10.1002/cite.201700082.

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7

Ying, Yongling, Rongbo Zheng, Yongjun Zheng, Hongyan Wang, Junfeng Niu, and Housheng Xia. "Synthesis and Reduction Processes of Silver Nanowires in a Silver(I) Sulfamate–Poly (Vinylpyrrolidone) Hydrothermal System." Molecules 29, no. 7 (March 30, 2024): 1558. http://dx.doi.org/10.3390/molecules29071558.

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Silver (Ag) nanowires, as an important one-dimensional (1D) nanomaterial, have garnered wide attention, owing to their applications in electronics, optoelectronics, sensors, and other fields. In this study, an alternative hydrothermal route was developed to synthesize Ag nanowires via modified reduction of Ag+. Silver sulfamate plays an important role in the formation of Ag nanowires via controlled release of free Ag+. Results of controlled experiments and characterizations such as UV–vis spectroscopy, FTIR, XPS, and 1H NMR revealed that sulfamic acid does not function as a reductant, supporting by the generation of free Ag+ instead of Ag nanostructures in hydrothermally treated silver sulfamate solution. The initial reduction of Ag+ was induced by the combination of poly (vinylpyrrolidone) (PVP) end group and degradation products. This phenomenon was supported by abundant free Ag+ in the mixed preheated silver sulfamatic and preheated PVP aqueous solutions, indicating a second and distinct Ag+ autocatalytic reduction. Thus, the roles of different reagents and Ag+ reduction must be studied for nanomaterial syntheses.

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Benedek, Peter, Nils Wenzler, Maksym Yarema, and Vanessa C. Wood. "Low temperature hydrothermal synthesis of battery grade lithium iron phosphate." RSC Advances 7, no. 29 (2017): 17763–67. http://dx.doi.org/10.1039/c7ra00463j.

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Battery-grade LiFePO₄ is prepared via low-temperature hydrothermal synthesis. Optimizing the precursor concentration and the reaction time saves more than 30% energy compared to earlier hydrothermal syntheses of LiFePO₄ nanoparticles.

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Regny, Sylvain, Yan Suffren, Olivier Leynaud, Isabelle Gautier-Luneau, and Géraldine Dantelle. "Evidence of reaction intermediates in microwave-assisted synthesis of SHG active α-La(IO3)3 nanocrystals." CrystEngComm 22, no. 14 (2020): 2517–25. http://dx.doi.org/10.1039/d0ce00156b.

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Caramazana-González, P., P. W. Dunne, M. Gimeno-Fabra, M. Zilka, M. Ticha, B. Stieberova, F. Freiberg, J. McKechnie, and E. H. Lester. "Assessing the life cycle environmental impacts of titania nanoparticle production by continuous flow solvo/hydrothermal syntheses." Green Chemistry 19, no. 6 (2017): 1536–47. http://dx.doi.org/10.1039/c6gc03357a.

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Komarneni, Sridhar, Young Dong Noh, Joo Young Kim, Seok Han Kim, and Hiroaki Katsuki. "Solvothermal/ Hydrothermal Synthesis of Metal Oxides and Metal Powders with and without Microwaves." Zeitschrift für Naturforschung B 65, no. 8 (August 1, 2010): 1033–37. http://dx.doi.org/10.1515/znb-2010-0809.

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Anatase and Ca, Sr and Ca0.5Sr0.5 hydroxyapatites were synthesized by conventional-hydrothermal (C-H) as well asmicrowave-hydrothermal (M-H)methods.Microwave-assisted reactions led to accelerated syntheses of anatase but no such acceleration of reactions could be detected with the syntheses of hydroxyapatites because the crystallization of the latter materials occurred at very low temperature. Cu and Au metal powders were produced by using glucose, fructose or sucrose as reducing agents under C-H conditions at 160 ℃, where fructose and sucrose were found to be stronger reducing agents than glucose. The crystallinity of all the powders was characterized by powder X-ray diffraction, and morphology and particle sizes were determined by scanning or transmission electron microscopy

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Singh, Manish Kumar, Prajwal Chettri, Ajay Tripathi, Archana Tiwari, Bratindranath Mukherjee, and R. K. Mandal. "Defect mediated magnetic transitions in Fe and Mn doped MoS2." Physical Chemistry Chemical Physics 20, no. 23 (2018): 15817–23. http://dx.doi.org/10.1039/c8cp02882f.

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13

Taublaender, M. Josef, Stefano Mezzavilla, Sophia Thiele, Florian Glöcklhofer, and Miriam M. Unterlass. "Hydrothermale Synthese von konjugierten Polymeren am Beispiel von Pyrronpolymeren und Polybenzimidazolen." Angewandte Chemie 132, no. 35 (May 11, 2020): 15160–71. http://dx.doi.org/10.1002/ange.202000367.

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14

Taublaender, M. Josef, Florian Glöcklhofer, Martina Marchetti-Deschmann, and Miriam M. Unterlass. "Grüne und rasche hydrothermale Kristallisation und Synthese vollständig konjugierter aromatischer Verbindungen." Angewandte Chemie 130, no. 38 (July 19, 2018): 12450–54. http://dx.doi.org/10.1002/ange.201801277.

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15

Klenner, Mitchell A., Marina Cagnes, Kathleen Wood, Kazuki Mita, Mizuki Kishimoto, and Tamim Darwish. "Decagram scale production of deuterated mineral oil and polydecene as solvents for polymer studies in neutron scattering." Polymer Chemistry 11, no. 31 (2020): 4986–94. http://dx.doi.org/10.1039/d0py00690d.

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16

Wolf, Friedrich, Joachim Holzweißig, and Volker Eckart. "Zur hydrothermalen Synthese von zeolithischen Molekularsieben in Gegenwart von Salzen." Zeitschrift für Chemie 12, no. 11 (September 1, 2010): 422–23. http://dx.doi.org/10.1002/zfch.19720121111.

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17

Drofenik, Miha, Darja Lisjak, and Darko Makovec. "The Synthesis and Properties of Magnetic Nanoparticles." Materials Science Forum 494 (September 2005): 129–36. http://dx.doi.org/10.4028/www.scientific.net/msf.494.129.

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Magnetic nanoparticles are materials of great interest because of the remarkable fundamental properties exhibited by these materials as well as their technological potential in the area of biomedicine and other areas. The technologically useful properties of magnetic nanomaterials are not limited to their structural, chemical or mechanical behaviour, but also involve the phenomena that arise from their finite size and the surface effects that dominate the magnetic behaviour of individual nanoparticles. New techniques that have been developed recently have permitted researchers to produce larger quantities of nanomaterials and characterize them better. Here, some of the most promising procedures are reported, including techniques based on hydrothermal syntheses, sol-gel syntheses, co-precipitation syntheses, mechanochemical syntheses, sonochemical syntheses, spray pyrolysis and microemulsion-assisted syntheses.

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Kubo, Takashi, Masayuki Hogiri, Hiroshi Kagata, and Atsushi Nakahira. "Synthesis of Nano-Sized Barium Titanate Powder by Rotary-Hydrothermal Process." Key Engineering Materials 421-422 (December 2009): 269–72. http://dx.doi.org/10.4028/www.scientific.net/kem.421-422.269.

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Nano-sized BaTiO3 powders with narrow size distribution and the high tetragonality were attempted to synthesize by the rotary-hydrothermal process in water system, using two kinds of commercial anatase-type TiO2 (ST21/ST01) with different particle size and Ba(OH)2. The rotary-hydrothermal syntheses were done with the rotary-speed of 20 revolutions per minute at 523 K for 24 h. Highly- and mono-dispersed BaTiO3 powders were successfully synthesized by applying the rotary-hydrothermal process. For rotary-hydrothermal synthesis, it was found that the average size, tetragonality, and quality of the BaTiO3 particle strongly depended on the particle size of the starting material. In the case of using ST01 as a starting material, BaTiO3 nano-powders mainly composed of coarse-faceted particles (average particle size = ca.100 nm) with the tetragonal phase and very little lattice defects were successfully synthesized.

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Marčec, Jan, Alenka Ristić, and Nataša Zabukovec Logar. "New Insights into ZIF-90 Synthesis." Molecules 29, no. 16 (August 6, 2024): 3731. http://dx.doi.org/10.3390/molecules29163731.

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Zeolitic imidazolate frameworks (ZIFs) are traditionally synthesized using N, N-dimethylformamide (DMF). However, DMF is toxic and hazardous to human health and the environment, hence other alternative solvents need to be considered. Herein, three different solvents like methanol, water and acetone were used to replace DMF and to explore the syntheses of ZIF-90 using a conventional and a microwave-assisted solvothermal method to obtain hydrothermally stable products, which also exhibit an increased water uptake. Pure ZIF-90 was synthesized under ambient pressure at 60 °C for 90 min using the conventional solvothermal method in an acetone–water solution, while under microwave irradiation it was formed in only 5 min at 80 °C. Altering methanol, water and acetone in the reaction mixture significantly affected the structural and water adsorption properties of ZIF-90s, which were monitored via PXRD, TGA, nitrogen and water sorption, and SEM. The highly efficient, less toxic, low-cost and activation-free microwave synthesis resulted in the formation of ZIF-90 nanoparticles that exhibited the highest maximum water adsorption capacity (0.37 g/g) and the best hydrothermal stability between water adsorption at 30 °C and desorption at 100 °C at 12.5 mbar among all the products obtained.

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20

Zhang, Lichun, Liping Kang, Hao Lv, Zhikui Su, Kenta Ooi, and Zong-Huai Liu. "Controllable synthesis, characterization, and electrochemical properties of manganese oxide nanoarchitectures." Journal of Materials Research 23, no. 3 (March 2008): 780–89. http://dx.doi.org/10.1557/jmr.2008.0091.

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Flowerlike manganese oxide microspheres and cryptomelane-type manganese oxide nanobelts were selectively synthesized by a simple decomposition of KMnO4 under mild hydrothermal conditions without using template or cross-linking reagents. The effect of varying the hydrothermal times and temperatures on the nanostructure, morphology, compositional, and electrochemical properties of the obtained manganese oxides was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) studies showed that the flowerlike manganese oxide microspheres could be obtained at relatively low hydrothermal temperatures, while high hydrothermal temperatures were favorable for the formation of cryptomelane-type manganese oxide nanobelts. A morphology and crystalline evolution of the nanostructures was observed as the hydrothermal temperature was increased from 180 to 240 °C. On the basis of changing the temperatures and hydrothermal reaction times, the formation mechanism of cryptomelane-type manganese oxide nanobelts is discussed. Cyclic voltammetry (CV) was used to evaluate the electrochemical properties of the obtained manganese oxide nanostructures, and the results show that the electrochemical properties depend on their shape and crystalline structure. This easily controllable, template-free, and environmentally friendly method has the potential for being used in syntheses of manganese oxide nanomaterials with uniform morphologies and crystal structures.

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Stevens, Richard A., Casey C. Raymond, and Peter K. Dorhout. "Hydrothermale Synthese von [{(NH4)2[Mo3S11.72Se1.28]}2[Se12]] mit neuartigem Se12-Ring." Angewandte Chemie 107, no. 22 (November 17, 1995): 2737–39. http://dx.doi.org/10.1002/ange.19951072222.

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22

Cockell, Charles S. "The origin and emergence of life under impact bombardment." Philosophical Transactions of the Royal Society B: Biological Sciences 361, no. 1474 (September 7, 2006): 1845–56. http://dx.doi.org/10.1098/rstb.2006.1908.

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Craters formed by asteroids and comets offer a number of possibilities as sites for prebiotic chemistry, and they invite a literal application of Darwin's ‘warm little pond’. Some of these attributes, such as prolonged circulation of heated water, are found in deep-ocean hydrothermal vent systems, previously proposed as sites for prebiotic chemistry. However, impact craters host important characteristics in a single location, which include the formation of diverse metal sulphides, clays and zeolites as secondary hydrothermal minerals (which can act as templates or catalysts for prebiotic syntheses), fracturing of rock during impact (creating a large surface area for reactions), the delivery of iron in the case of the impact of iron-containing meteorites (which might itself act as a substrate for prebiotic reactions), diverse impact energies resulting in different rates of hydrothermal cooling and thus organic syntheses, and the indiscriminate nature of impacts into every available lithology—generating large numbers of ‘experiments’ in the origin of life. Following the evolution of life, craters provide cryptoendolithic and chasmoendolithic habitats, particularly in non-sedimentary lithologies, where limited pore space would otherwise restrict colonization. In impact melt sheets, shattered, mixed rocks ultimately provided diverse geochemical gradients, which in present-day craters support the growth of microbial communities.

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23

Rouchalová, Kamila, Dana Rouchalová, Vladimír Čablík, and Dalibor Matýsek. "Microwave-Assisted Hydrothermal Synthesis of Pure-Phase Sodalite (>99 wt.%) in Suspension: Methodology Design and Verification." Materials 17, no. 1 (January 4, 2024): 269. http://dx.doi.org/10.3390/ma17010269.

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Despite numerous studies focused on the hydrothermal (HT) synthesis of fly ash zeolites (FAZs), this method still has many limitations, the main of which is the low yield of zeolites. Hydrothermally synthesized zeolites are typically multiphase and exhibit low purity, which limits their applicability. Pure-phase zeolites have been primarily prepared from filtrates after alkaline mineralization of fly ashes, not directly in suspension. In addition, the published methodologies have not been tested in a wider set of samples, and thus their reproducibility is not confirmed. The aim of the study is to propose a reproducible methodology that overcomes the mentioned limitations. The influence of the Si/Al ratio (1.3:1–1:2), the type and concentration of the activator (2/4 M NaOH/KOH/LiOH), the reagent (30% LiCl), the duration (24–168 h), and the temperature (50–180 °C) of the synthesis phases were studied. The sequence of the synthesis phases was also optimized, depending on the type of heat transfer. The fly ashes were analyzed by wavelength-dispersive X-ray fluorescence (WD XRF), flame atomic absorption spectrometry (F-AAS), and X-ray diffraction (XRD). The energy intensity of the synthesis was reduced through the application of unique microwave digestion technology. Both microwave and combined (microwave and convection) syntheses were conducted. FAZs were identified and quantified by XRD analysis. This study presents a three-stage (TS) hydrothermal synthesis of pure-phase sodalite in suspension. Sodalite (>99 wt.%) was prepared from nine fly ashes under the following conditions: I. microwave phase: 120 °C, 150 min, solid-to-liquid ratio (S/L) 1:5, Si/Al ratio 1:1.5, and 4 M NaOH; II. convection phase: 120 °C, 24 h, S/L 1:40, and the addition of 30 mL of 30% LiCl; and III. crystallization: 70 °C for 24 h. The formation of rhombododecahedral sodalite crystals was confirmed by scanning electron microscope (SEM) images.

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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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Long, G., David Matatov, Acher Suissa, Elmustapha Feddi, M. EL Yadri, Kawtar Feddi, and M. Sadoqi. "Hydrothermal Synthesis and Characterization of Mn-Doped VO2 Nanowires." MRS Advances 4, no. 14 (2019): 829–36. http://dx.doi.org/10.1557/adv.2019.60.

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AbstractMonoclinic VO2 is a known polymorph of vanadium dioxide that has received much attention due to its oxidative capabilities, geometric configuration, and promising applications in functional windows. VO2 can usually be obtained through a hydrothermal method under high pressure. In this work we report a synthesis of VO2 doped with Manganese using a rapid single-step hydrothermal process with V2O5, manganese (II) acetate and citric acid as precursors. Different syntheses were carried out in which the concentration of V2O5 and citric acid remained constant whereas the concentration of manganese (II) acetate was varied. The reactants underwent a stirring phase for 30 minutes before being loaded into a hydrothermal reactor for 2.5 hours at 200°C. The resultant was washed three times to remove the residual precursors. Imaging and spectroscopy characterizations such as TEM, SEM and UV-VIS-NIR have been performed on different doping concentration and the results display a dependence on doping concentrations.

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26

Choi, Hyeongwoo, Sang Lyeol Kim, Man-Ki Jeong, Ok Hwan Yu, and Seongil Eyun. "Identification and Phylogenetic Analysis of Chitin Synthase Genes from the Deep-Sea Polychaete Branchipolynoe onnuriensis Genome." Journal of Marine Science and Engineering 10, no. 5 (April 28, 2022): 598. http://dx.doi.org/10.3390/jmse10050598.

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Chitin, one of the most abundant biopolymers in nature, is a crucial material that provides sufficient rigidity to the exoskeleton. In addition, chitin is a valuable substance in both the medical and industrial fields. The synthesis of chitin is catalyzed by chitin synthase (CHS) enzymes. Although the chitin synthesis pathway is highly conserved from fungi to invertebrates, CHSs have mostly only been investigated in insects and crustaceans. Especially, little is known about annelids from hydrothermal vents. To understand chitin synthesis from the evolutionary view in a deep-sea environment, we first generated the whole-genome sequencing of the parasitic polychaete Branchipolynoe onnuriensis. We identified seven putative CHS genes (BonCHS1-BonCHS7) by domain searches and phylogenetic analyses. This study showed that most crustaceans have only a single copy or two gene copies, whereas at least two independent gene duplication events occur in B. onnuriensis. This is the first study of CHS obtained from a parasitic species inhabiting a hydrothermal vent and will provide insight into various organisms’ adaptation to the deep-sea hosts.

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Ban, Yao Wen, Wen Li Wang, Wei Zhang, and Jian Han. "The Synthesis of the Novel Vacuum Ultraviolet Double Frequency Crystal KBe₂BO₃F₂ (KBBF)." Advanced Materials Research 1004-1005 (August 2014): 348–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.348.

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KBe2BO3F2 (KBBF) crystal is a sole important and practical ultraviolet nonlinear optical material. It can realize the output of vacuum ultraviolet laser below 200nm with the method of phase-matching. However, it is difficult to grow a practical crystal size with the general growth methods such as fluxed melts, hydrothermal or prism-coupling technique because of the layering growth habit. A reduced-pressure melts growth method was presented to grow bulk KBBF crystal and how to achieve the high quality raw material for growth is a critical factor. In this paper, the influences of syntheses methods of raw material and experiment conditions were discussed, and the best syntheses method was selected.

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KILIÇ DOKAN, Fatma. "Investigation of the Effect of Different Synthesis Methods on the Photocatalytic Activity of TiO2: Comparison of Rutile and Anatase TiO2." Cumhuriyet Science Journal 43, no. 3 (September 30, 2022): 409–15. http://dx.doi.org/10.17776/csj.1107688.

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In this study, the effect of the synthesis method (solid state, sol-gel and hydrothermal) on the photocatalytic activity of the anatase and rutile phases of TiO2 was evaluated. As a result of XRD, FESEM and BET analysis of pure phase TiO2 powders in anatase and rutile phases, the changes in particle structures, surface areas and morphologies were examined and the differences in both synthesis method and phase structures were evaluated with Photodegradation experiments. The results of the X-ray diffraction (XRD) analysis showed that the TiO2 compound synthesized in the anatase phase and by the synthesized hydrothermal method exhibited a much smaller crystal size than the other synthesis methods and the rutile phase. Surface morphology examinations of the samples were made with scanning electron microscopy (FESEM), particle sizes were determined in the range of 90-200 nm, and their surface areas were examined by Brunauer–Emmett–Teller (BET) analysis.The adsorption-desorption isotherms shown also support the XRD data of the highest surface area.The photocatalytic behavior of the compounds was investigated using methylene blue degradation.As a result of all the syntheses and characterization studies, it has been shown that TiO2 obtained by hydrothermal method exhibits the best photocatalytic activity.

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Rouhani, Roya, Hamid Reza Aghabozorg, Mohsen Asadi Asadabad, and Hossein Aghabozorg. "Synthesis of Mo, W, and Mo- and W-Doped Multiwall VONTs via Sol-Gel and Hydrothermal Methods." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/243920.

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Mo, W, and Mo and W were doped into multiwall vanadium oxide nanotubes. The syntheses were performed using sol-gel method followed by hydrothermal method. The synthesized samples were characterized by XRD, SEM, EDX, and TEM techniques. The XRD patterns of the synthesized samples indicated that Mo and W could be doped into VONTs totally up to 50%. The SEM and TEM images showed that the prepared samples have tubular and multiwall morphology and open ends.

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Auwal, Ismail Alhassan, Fitri Khoerunnisa, Florent Dubray, Svetlana Mintova, Tau Chuan Ling, Ka-Lun Wong, and Eng-Poh Ng. "Effects of Synthesis Parameters on the Crystallization Profile and Morphological Properties of SAPO-5 Templated by 1-Benzyl-2,3-Dimethylimidazolium Hydroxide." Crystals 11, no. 3 (March 12, 2021): 279. http://dx.doi.org/10.3390/cryst11030279.

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The formation of SAPO-5 molecular sieves is studied under hydrothermal conditions in the presence of a new templating agent, 1-benzyl-2,3-dimethylimidazolium hydroxide ([bzmIm]OH). The syntheses were carried out by varying the synthesis parameters, viz. crystallization temperature, heating time and reactants molar composition (SiO2, Al2O3, P2O5, [bzmIm]+, H2O) in order to investigate the role of each synthesis parameter on the formation of SAPO-5. The results showed that these synthesis parameters had significant influences on the entire crystallization process (induction, nucleation, crystal growth, and Ostwald ripening) and physicochemical properties of SAPO-5 (morphology and crystal size). Moreover, this study also demonstrated a fast hydrothermal synthesis approach where a SAPO-5 molecular sieve with hexagonal prism morphology could be crystallized within 10 h instead of days using a novel [bzmIm]OH heterocyclic template, thus offering an alternative route for synthesizing zeolite-like materials for advanced applications.

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Czarna-Juszkiewicz, Dorota, Piotr Kunecki, Rafał Panek, Jarosław Madej, and Magdalena Wdowin. "Impact of Fly Ash Fractionation on the Zeolitization Process." Materials 13, no. 5 (February 25, 2020): 1035. http://dx.doi.org/10.3390/ma13051035.

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Coal combustion product in the form of fly ash has been sieved and successfully utilised as a main substrate and a carrier of silicon and aluminium in a set of hydrothermal syntheses of zeolites. The final product was abundant in zeolite X phase (Faujasite framework). Raw fly ash as well as its derivatives, after being sieved (fractions: ≤ 63, 63–125, 125–180 and ≥ 180 µm), and the obtained zeolite materials were subjected to mineralogical characterisation using powder X-ray diffraction, energy-dispersive X-ray fluorescence, laser diffraction-based particle size analysis and scanning electron microscopy. The influence of fraction separation on the zeolitization process under hydrothermal synthesis was investigated. Analyses performed on the derived zeolite X samples revealed a meaningful impact of the given fly ash fraction on synthesis efficiency, chemistry, quality as well as physicochemical properties, while favouring a given morphological form of zeolite crystals. The obtained zeolites possess great potential for use in many areas of industry and environmental protection or engineering.

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32

Taublaender, M. Josef, Stefano Mezzavilla, Sophia Thiele, Florian Glöcklhofer, and Miriam M. Unterlass. "Rücktitelbild: Hydrothermale Synthese von konjugierten Polymeren am Beispiel von Pyrronpolymeren und Polybenzimidazolen (Angew. Chem. 35/2020)." Angewandte Chemie 132, no. 35 (July 20, 2020): 15380. http://dx.doi.org/10.1002/ange.202009419.

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33

Taublaender, M. Josef, Florian Glöcklhofer, Martina Marchetti-Deschmann, and Miriam M. Unterlass. "Innentitelbild: Grüne und rasche hydrothermale Kristallisation und Synthese vollständig konjugierter aromatischer Verbindungen (Angew. Chem. 38/2018)." Angewandte Chemie 130, no. 38 (August 1, 2018): 12358. http://dx.doi.org/10.1002/ange.201808280.

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34

Tang, Long, JiaoWei Nan, YuFei Zheng, JiJiang Wang, XiangYang Hou, and Xiao Wang. "A cobalt-based coordination polymer with a tripodal carboxylate ligand: synthese, structure and properties." Zeitschrift für Naturforschung B 76, no. 8 (August 1, 2021): 447–52. http://dx.doi.org/10.1515/znb-2021-0074.

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Abstract A new cobalt-based coordination polymer (CP), [Co(Htatb)(1,4-bib)]·DMF (1), has been hydrothermally synthesized from CoCl2 ·6H2O, 4,4′,4′′-s-triazine-2,4,6-tribenzoic acid (H3tatb), and 1,4-bis(1-imidazoly)benzene (1,4-bib). The product has been characterized by IR spectroscopy, elemental and thermogravimetric analysis, and single-crystal X-ray diffraction. In compound 1, the Htatb ligand links three CoII ions resulting in a double-strand chain structure, further bridged through the 1,4-bib ligands to generate a 2D structure with channels. The fluorescence and cyclovoltammetry characteristics of compound 1 have also been investigated.

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Kupińska, Katarzyna, Maciej Michalik, Justyna Krajenta, Magda Bielicka, Karolina Halina Markiewicz, Beata Kalska-Szostko, and Agnieszka Zofia Wilczewska. "An In-Situ Fabrication Method of ZnO and Other Zn(II) Compounds Containing Polypropylene Composites." International Journal of Molecular Sciences 24, no. 3 (January 25, 2023): 2357. http://dx.doi.org/10.3390/ijms24032357.

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This study investigated the methods of preparation of zinc oxide-polypropylene nanocomposites and their antibacterial properties. Seven solutions with ZnO nanoparticles or zinc ions were formulated as a PP additive. Two methods of ZnO NPs syntheses were carried out: (1) a modified hydrothermal method where a water solution of zinc acetate dihydrate, PEI, and ammonia were mixed with a final pH 11; (2) a thermal decomposition of a water solution of zinc acetate in the presence of PEI and ammonia using a two-screw extruder. During the experiments, the influence of various amounts of particle stabilizer, heating of the solutions, and the temperatures of the syntheses were examined. As a result, the simultaneous crystallization of ZnO in the extrusion process confirmed this method’s attractiveness from the application point of view. Fabricated PP-ZnO composite shows antibacterial properties against Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae.

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Wolf, Friedrich, and Siegfried Horn. "Über den Einfluß organischer Verbindungen auf die hydrothermale Synthese zeolithischer Molekularsiebe der Typen A, X, und Y." Zeitschrift für Chemie 13, no. 3 (September 1, 2010): 109–10. http://dx.doi.org/10.1002/zfch.19730130318.

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Oreggioni, Daniela A., Ivana Aguiar, Laura Fornaro, and María E. Pérez Barthaburu. "Hydrothermal synthesis and characterization of SnS2 nanoparticles with capping pyridine and aniline." MRS Advances 3, no. 61 (2018): 3563–68. http://dx.doi.org/10.1557/adv.2018.525.

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ABSTRACTSnS2 has adequate properties for photovoltaic applications in solar cells. For this purpose, we studied the influence of the capping agents pyridine and aniline in the nanoparticles hydrothermal syntheses. These capping agents are suitable for use in hybrid organic- inorganic solar cells. Different ratios of these agents with respect to the metal precursor were tested. Hexagonal and disc-type nanoparticles were obtained. Lower concentrations of capping agent increased the proportion of hexagons, while diminishing their size. The obtained products are adequate in size, dispersion of size, and stabile in suspension in chloroform to use them in hybrid solar cells. Moreover, the use ofpyridine allowed for more stable suspensions, and therefore better results for this application.

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Pirez, C., A. F. Lee, J. C. Manayil, C. M. A. Parlett, and K. Wilson. "Hydrothermal saline promoted grafting: a route to sulfonic acid SBA-15 silica with ultra-high acid site loading for biodiesel synthesis." Green Chem. 16, no. 10 (2014): 4506–9. http://dx.doi.org/10.1039/c4gc01139b.

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Han, Hoang Van. "STUDY THE RESPONSE OF GAS SENSOR USING ZnO NANORODS SYNTHESIZED BY HYDROTHERMAL METHOD." Vietnam Journal of Science and Technology 54, no. 5A (March 22, 2018): 201. http://dx.doi.org/10.15625/2525-2518/54/5a/12078.

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Low-dimensional nano structures ZnO are potential material for optoelectronicand gas-sensing applications. The syntheses of a large quantity of ZnO nanostructures play an important role for practical applications for future. In the paper, we propose hydrothermal reduction method to synthesize large quantities ZnO nanorods under atmospheric pressure and without using any catalysts. As-prepared ZnO nanorods exhibited a hexagonal wurtzite crystal structure. For sensing properties, ZnO nanorods were coated on the Pt interdigitated microelectrodes arrays and examined at operating temperatures of 200 to 350 oC for the detection capacity of NO2 gas. The changes in response resistance revealed that the sensor exhibited a high sensing performance for low concentrations of NO2 gas (0.5 ppm). Additionally, the ZnO nanowires sensors have a good performance to ethanol.

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Niu, Ben, Xin Wang, Kai Wu, Xianru He, and Rui Zhang. "Mesoporous Titanium Dioxide: Synthesis and Applications in Photocatalysis, Energy and Biology." Materials 11, no. 10 (October 9, 2018): 1910. http://dx.doi.org/10.3390/ma11101910.

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Mesoporous materials are materials with high surface area and intrinsic porosity, and therefore have attracted great research interest due to these unique structures. Mesoporous titanium dioxide (TiO2) is one of the most widely studied mesoporous materials given its special characters and enormous applications. In this article, we highlight the significant work on mesoporous TiO2 including syntheses and applications, particularly in the field of photocatalysis, energy and biology. Different synthesis methods of mesoporous TiO2—including sol–gel, hydrothermal, solvothermal method, and other template methods—are covered and compared. The applications in photocatalysis, new energy batteries and in biological fields are demonstrated. New research directions and significant challenges of mesoporous TiO2 are also discussed.

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Nascimento, A. R. do, R. L. B. de A. Medeiros, M. A. de F. Melo, D. M. de A. Melo, and M. J. B. de Souza. "Optimization of MCM-48 synthesis using factorial design." Cerâmica 62, no. 364 (December 2016): 413–17. http://dx.doi.org/10.1590/0366-69132016623642028.

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Abstract MCM-48 mesoporous materials were hydrothermally synthesized according to the 22 factorial design by varying the crystallization time and temperature of the synthesis gel, and characterized by means of X-ray diffraction analysis and adsorption of N2. In the crystallization temperature and time conditions used, specific areas between 924 to 1102 m2.g-1, pore volumes between 0.015 to 0.087 cm3.g-1 and pore diameters between 3.2 to 4.0 nm were obtained. It was observed that for the syntheses performed at high temperature, the crystallization time should be reduced so that the material structure is formed.

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Joshi, Mahesh Kumar, Hem Raj Pant, Han Joo Kim, Ni Na Liao, Jun Hee Kim, Bishnu Kumar Shrestha, Chan Hee Park, and Cheol Sang Kim. "Hydrothermally Synthesized Magnetically Separable RGO Supported Nanocomposite for Water Purification." Advanced Materials Research 1088 (February 2015): 540–43. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.540.

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Wastewater containing dyes and microbial bodies has attracted global attention because of the harmful effects on aquatic environment and human health. A considerable amount of dyes are present in the industrial effluents due to the loss during the processing of industrial products. The purpose of this study was to syntheses the composite particle for the effective removal of dyes and microbial bodies from aqueous solution. For this purpose, RGO supported nanocomposite was prepared using hydrothermal treatment of aqueous solution containing graphene oxide (GO), aqueous solution of silver nitrate and ferrous chloride tetrahydrate, and ethanol as precursor. Transmission electron microscopy, Raman spectroscopy, and X-ray diffraction indicated the formation of RGO supported silver doped iron oxide nanocomposite. As synthesized nanocomposite was highly effective for the adsorption of methylene blue and reduction of p-nitrophenol in aqueous solution, and also had high antibacterial capacity. The composite synthesis protocol is a simple and efficient to produce a unique composite for environmental remediation.

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Martinelli, Laure, Vanessa Redou, Bastien Cochereau, Ludovic Delage, Nolwenn Hymery, Elisabeth Poirier, Christophe Le Meur, et al. "Identification and Characterization of a New Type III Polyketide Synthase from a Marine Yeast, Naganishia uzbekistanensis." Marine Drugs 18, no. 12 (December 11, 2020): 637. http://dx.doi.org/10.3390/md18120637.

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A putative Type III Polyketide synthase (PKSIII) encoding gene was identified from a marine yeast, Naganishia uzbekistanensis strain Mo29 (UBOCC-A-208024) (formerly named as Cryptococcus sp.) isolated from deep-sea hydrothermal vents. This gene is part of a distinct phylogenetic branch compared to all known terrestrial fungal sequences. This new gene encodes a C-terminus extension of 74 amino acids compared to other known PKSIII proteins like Neurospora crassa. Full-length and reduced versions of this PKSIII were successfully cloned and overexpressed in a bacterial host, Escherichia coli BL21 (DE3). Both proteins showed the same activity, suggesting that additional amino acid residues at the C-terminus are probably not required for biochemical functions. We demonstrated by LC-ESI-MS/MS that these two recombinant PKSIII proteins could only produce tri- and tetraketide pyrones and alkylresorcinols using only long fatty acid chain from C8 to C16 acyl-CoAs as starter units, in presence of malonyl-CoA. In addition, we showed that some of these molecules exhibit cytotoxic activities against several cancer cell lines.

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Martin, William, and Michael J. Russell. "On the origin of biochemistry at an alkaline hydrothermal vent." Philosophical Transactions of the Royal Society B: Biological Sciences 362, no. 1486 (November 3, 2006): 1887–926. http://dx.doi.org/10.1098/rstb.2006.1881.

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A model for the origin of biochemistry at an alkaline hydrothermal vent has been developed that focuses on the acetyl-CoA (Wood–Ljungdahl) pathway of CO 2 fixation and central intermediary metabolism leading to the synthesis of the constituents of purines and pyrimidines. The idea that acetogenesis and methanogenesis were the ancestral forms of energy metabolism among the first free-living eubacteria and archaebacteria, respectively, stands in the foreground. The synthesis of formyl pterins, which are essential intermediates of the Wood–Ljungdahl pathway and purine biosynthesis, is found to confront early metabolic systems with steep bioenergetic demands that would appear to link some, but not all, steps of CO 2 reduction to geochemical processes in or on the Earth's crust. Inorganically catalysed prebiotic analogues of the core biochemical reactions involved in pterin-dependent methyl synthesis of the modern acetyl-CoA pathway are considered. The following compounds appear as probable candidates for central involvement in prebiotic chemistry: metal sulphides, formate, carbon monoxide, methyl sulphide, acetate, formyl phosphate, carboxy phosphate, carbamate, carbamoyl phosphate, acetyl thioesters, acetyl phosphate, possibly carbonyl sulphide and eventually pterins. Carbon might have entered early metabolism via reactions hardly different from those in the modern Wood–Ljungdahl pathway, the pyruvate synthase reaction and the incomplete reverse citric acid cycle. The key energy-rich intermediates were perhaps acetyl thioesters, with acetyl phosphate possibly serving as the universal metabolic energy currency prior to the origin of genes. Nitrogen might have entered metabolism as geochemical NH 3 via two routes: the synthesis of carbamoyl phosphate and reductive transaminations of α-keto acids. Together with intermediates of methyl synthesis, these two routes of nitrogen assimilation would directly supply all intermediates of modern purine and pyrimidine biosynthesis. Thermodynamic considerations related to formyl pterin synthesis suggest that the ability to harness a naturally pre-existing proton gradient at the vent–ocean interface via an ATPase is older than the ability to generate a proton gradient with chemistry that is specified by genes.

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Bøjesen, Espen, Kirsten Jensen, Christoffer Tyrsted, Nina Lock, Mogens Christensen, and Bo Iversen. "In- and ex situ PXRD studies of ZnO nanoparticle growth in sub-critical water." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1413. http://dx.doi.org/10.1107/s2053273314085866.

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Zinc oxide (ZnO) is a material of great scientific and industrial relevance and is used widely in a variety of applications. Synthesis of ZnO nanoparticles can be performed by a wide range of methods resulting in a tremendous variety of sizes and shapes. Different in situ characterization methods have been used to investigate the ZnO formation under various synthesis conditions; these include numerous spectroscopic methods and small angle scattering. Common for these studies is that the primary focus has been to extract information on particle size and shape of ZnO, while a more rigorous microstructural and structural analysis has been lacking. Furthermore, the aforementioned studies have primarily been focused on soft chemical synthesis methods, at low temperatures and in non-aqueous media, thus omitting the widely used environmentally benign and versatile hydrothermal method. In the present work the formation of ZnO during hydrothermal synthesis has been followed using in situ powder X-ray diffraction (PXRD) combined with Rietveld refinement, thus enabling the extraction of crystallographic as well as microstructural information during the formation and growth of ZnO. Supporting ex situ syntheses and characterization by electron microcopy, high resolution PXRD and other techniques have been used to corroborate the findings from the in situ experiments. Mapping out a vast parameter space has led to a deeper understanding of the intricate mechanisms governing the nucleation and growth of ZnO nanoparticles during hydrothermal synthesis. Among the parameters studied were the influence of temperature, type of base used and the influence of different ionic salts as synthesis directing agents. The various synthesis parameters were found to influence the following structural and microstructural features: crystallite shape, morphology and size as well as the twin-fault concentration, degree of doping and crystallinity.

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Fernández-Sánchez, Lilia, and Mirella Gutiérrez-Arzaluz. "Synthesis of copper hydroxyphosphate under the principles of green chemistry." Applied Chemical Engineering 5, no. 2 (July 8, 2022): 20. http://dx.doi.org/10.24294/ace.v5i2.1637.

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This work aims to present two syntheses according to the green chemistry principles of Cu2(OH)PO4. The first one is a mechanochemical synthesis which was carried out with Cu3(PO4)2 and NaOH at room temperature and without solvent (principles five and six), the second one employed an aqueous suspension of copper phosphate (principle six). The products were characterized by X-ray diffraction, scanning electron microscopy, infrared spectroscopy and elemental analysis. Using an analysis and evaluation scale based on green principles, the synthesis method reported in this study was compared with the traditional hydrothermal synthesis method, which was found to be a polluting process, while the synthesis method reported in this study was a clean process. It was concluded that clean processes lead to time savings, low energy costs and environmental care.

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Jäger, Lothar, Volker Lorenz, Thomas Müller, Hans-Peter Abicht, Michael Rössel, and Helmar Görls. "Bariumstannat-Pulver durch hydrothermale Synthese und durch Thermolyse von Bariumzinn(IV)-glykolaten. Synthese und Struktur von [Ba(C2H6O2)4][Sn(C2H4O2)3] und [Ba(C2H6O2)2][Sn(C2H4O2)3]·CH3OH." Zeitschrift für anorganische und allgemeine Chemie 630, no. 1 (January 2004): 189–95. http://dx.doi.org/10.1002/zaac.200300217.

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Staněk, T., A. Rybová, I. Khongová, and A. Zezulová. "Low-temperature synthesis of binder with belite content." Journal of Physics: Conference Series 2568, no. 1 (August 1, 2023): 012005. http://dx.doi.org/10.1088/1742-6596/2568/1/012005.

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Abstract Sol-gel methods or hydrothermal treatment in combination with low-temperature burning are used for low-temperature syntheses of hydraulically active dicalcium silicate. The paper describes a two-stage preparation process without the use of an autoclave. In the first phase, the precursors of hydraulically active phases are prepared. In the second phase, burning up to 1000 °C takes place to form a C2S-based binder. Unlike commonly used procedures of the sol-gel method, solid raw materials and water are used. The main raw materials are quicklime and a source of SiO2 and then various activators. X-ray diffraction analysis and electron microscopy methods were used for the research. The resulting binders are similar to hydraulic lime, they achieve low initial strengths, the long-term strengths are satisfactory. It is suitable for the preparation of mortars and plaster mixtures.

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Ejsmont, Aleksander, and Joanna Goscianska. "Hydrothermal Synthesis of ZnO Superstructures with Controlled Morphology via Temperature and pH Optimization." Materials 16, no. 4 (February 16, 2023): 1641. http://dx.doi.org/10.3390/ma16041641.

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Zinc oxide, as a widely used material in optics, electronics, and medicine, requires a complete overview of different conditions for facile and easily reproducible syntheses. Two types of optimization of ZnO hydrothermal preparation from zinc acetate and sodium hydroxide solution are presented, which allowed for obtaining miscellaneous morphologies of materials. The first was a temperature-controlled synthesis from 100 to 200 °C, using citric acid as a capping agent. The formation of hexagonal rods at the lowest temperature was evidenced, which agglomerated to flower-like structures at 110 and 120 °C. It was followed by transformation to flake-like roses at 160 °C, up to disordered structures composed of nanosized plates (>180 °C). The transformations were generated through a temperature change, which had an impact on the diffusion effect of hydroxide and citrate complexes. The second optimization was the hydrothermal synthesis free of organic additives and it included only a pH variation from 7.5 to 13.5. It was found that by utilizing a slow-dropping process and varying amounts of NaOH solutions, it is possible to obtain well-formed hexagonal pellets at pH 8.0–8.5. Strongly basic conditions of pH 11.0 and 13.5 impeded superstructure formations, giving small elongated particles of ZnO. All samples were characterized by high phase purity and crystallinity, with a specific surface area of 18–37 m2/g, whereas particle size distribution indicated a predominance of small particles (<1 μm).

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Le Comité de rédaction. "Erratum à l’article « Synthèse prébiotique dans les conditions hydrothermales » par Marie-Paule Bassez [C. R. Chimie 12 (6–7) (2009) 801–807]." Comptes Rendus Chimie 16, no. 11 (November 2013): 1071. http://dx.doi.org/10.1016/j.crci.2012.12.014.

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Journal articles on the topic 'Synthèse hydrothermale'

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