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Articles de revues sur le sujet « Hydro-thermal Synthesis »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Das, Birinchi K. « Solvo(hydro)thermal synthesis of metal-carbonyl tellurido clusters ». Proceedings / Indian Academy of Sciences 108, no 3 (juin 1996) : 323. http://dx.doi.org/10.1007/bf02870090.

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Yang, Xianfeng, Hiromi Konishi, Huifang Xu et Mingmei Wu. « Comparative Sol–Hydro(Solvo)thermal Synthesis of TiO2 Nanocrystals ». European Journal of Inorganic Chemistry 2006, no 11 (juin 2006) : 2229–35. http://dx.doi.org/10.1002/ejic.200500855.

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3

Zhao, Wei, Zhengping Hao et Chun Hu. « Synthesis of MCM-48 with a high thermal and hydro-thermal stability ». Materials Research Bulletin 40, no 10 (octobre 2005) : 1775–80. http://dx.doi.org/10.1016/j.materresbull.2005.05.012.

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Zhang, Wenchao, Bin Jiang, Xiaohang Ma, Jiaxin Wang, Jiaqi Liu, Runhui Wu, Zilong Zheng, Jingping Liu et Kefeng Ma. « Controllable synthesis of multi-shelled NiCo2O4 hollow spheres catalytically for the thermal decomposition of ammonium perchlorate ». RSC Advances 9, no 41 (2019) : 23888–93. http://dx.doi.org/10.1039/c9ra03865e.

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LI, Yan, et Chuan-sheng LIU. « Hydro/solvo-thermal synthesis of ZnO crystallite with particular morphology ». Transactions of Nonferrous Metals Society of China 19, no 2 (avril 2009) : 399–403. http://dx.doi.org/10.1016/s1003-6326(08)60285-x.

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Wu, Jing-Yun, Sheng-Ming Huang et Ming-Hsi Chiang. « Hydro(solvo)thermal synthesis of homochiral metal–camphorate coordination polymers ». CrystEngComm 12, no 11 (2010) : 3909. http://dx.doi.org/10.1039/c000872a.

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Sano, Saburo, Takeshi Fukuda et Yasuo Shibasaki. « Development of Platy Alumina and its Application ». Advances in Science and Technology 45 (octobre 2006) : 2204–11. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2204.

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It has been required to change the industrial production processes to low waste emission ones from a view point of environmental issue. In the production of aluminum building materials, large amount of sludge is emitted as industrial waste. If we can change the waste to valuable products, we can respond to the request. Synthesis technology of kaolinitic particles from various starting raw materials had been established at National Industrial Research Institute of Nagoya (NIRIN, present: AIST Chubu). Hydro-thermal treatment is applied to the technology and obtained particles show various shapes such as plate, shell and so on. Collaborative research work between NIRIN and YKK corporation to develop high performance alumina powder form aluminum sludge, a by-product from surface treatment process in the manufacturing of aluminum building materials, had been done by using the fruits from the research project on kaolinite synthesis at NIRIN. As the result, high performance platy alumina powder was developed by using hydro-thermal synthesis technology.
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8

Moon, S. M., Chongmu Lee et N. H. Cho. « Structural features of nanoscale BaTiO3 powders prepared by hydro-thermal synthesis ». Journal of Electroceramics 17, no 2-4 (décembre 2006) : 841–45. http://dx.doi.org/10.1007/s10832-006-0458-0.

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QASIM, A. K., L. A. JAMIL et A. F. ABDULRAHMAN. « SYNTHESIS OF RUTILE-TiO2 NANOROD ARRAYS FOR EFFICIENT SOLAR WATER SPLITTING VIA MICROWAVE-ASSISTED HYDROTHERMAL METHOD ». Digest Journal of Nanomaterials and Biostructures 15, no 1 (janvier 2020) : 157–65. http://dx.doi.org/10.15251/djnb.2020.151.157.

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Using a microwave-assisted hydro thermal method (MWAHM) a single crystalline of vertically aligned TiO2 nanorod (NR) arrays has been achieved via the novel ultra-rapid synthetic method for the production. High-quality NR arrays with controlled film thickness were achieved with fine control of the growth conditions as well. The effect of the different reaction conditions of MWAHM such as reaction time and growth temperature on the morphology, crystal orientation, and photo catalytic activity have been systematically investigated. In a typical condition of the MWAHM using 0.4 cm3 of titanium(IV) n-butoxide (TBO) at 180 °C for 40 minutes, a small diameter of 124 nm and short length 2.93 µm of TiO2 nanorods, are grown on fluorine-doped tin oxide (FTO) substrate. However, the photo current density produced TiO2 NRs of 2.90 mA cm-2 with a maximum photo conversion efficiency of about 2.7% which confers excellent photoelectrochemical performance. In comparison with the typical hydro thermal method (HM) synthesized NRs, the ultra-fast MWAHM synthesized NRs offers five times more efficiency photoelectrochemical (PEC) water splitting than the hydro thermal method (HM). The results suggest that these dense and aligned one-dimensional TiO2 nanorods are promising for hydrogen generation from water splitting based on PEC cells.
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Gheorghievici, Gavril Lucian, Corneliu Trisca Rusu, Elena Voicila, Ion Marius Nafliu, Anca Maria Cimbru et Szidonia Katalin Tanczos. « Titanium Dioxide for Biomedical Uses I. The controlled production of nanoparticles by hidrothermal synthesis moderated by dimedone ». Revista de Chimie 68, no 1 (15 février 2017) : 11–15. http://dx.doi.org/10.37358/rc.17.1.5378.

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The controlled the solvo-hydro-thermal titanium dioxide synthesis moderated by dimedone from organometallic precursors is approached in order to obtain nanoparticles compatible with the polymeric systems used in the dental technique. The experiments carried out with relation to the production of titanium dioxide nanoparticles using the solvo-hydro-thermal synthesis allowed the production of three types of materials by means of varying the nature of the used solvent: methanol, ethanol and propanol (TiO2-M, TiO2-E and TiO2-P).The characterisation using electron microscopy (SEM and HRTEM), X-ray analysis, FTIR and UV-Vis spectrometry show that the diameter of the produced nanoparticles is less than 15 nm and decreases in the order: dpMethanol ] dpEthanol ] dpPropanol. The nanoparticles contain trace organic substances which the smaller they are, the bigger the alcohol chain used as a solvent is. The adsorption of a target dye showed increasing values with the increasing number of atoms in the hydrocarbon alcohol chain. The highlighted characteristics suggest the possibility of using the synthesised nanoparticles in the production of hard implants for dental reconstruction.
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Moon, S. M., et Nam Hee Cho. « Synthesis and Structural Characterization of Nanoscale BaTiO3 Powders ». Materials Science Forum 558-559 (octobre 2007) : 1323–27. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.1323.

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Nanoscale BaTiO3 powders were prepared by hydro-thermal synthesis as a function of solvent conditions. The size of the BaTiO3 powders was in the range of 20 ~ 100 nm. The variation in the relative volume fraction of the tetragonal phase was analyzed quantitatively by means of XRD and Raman spectroscopy. It was found that the maximum volume fraction of the tetragonal phase was ~ 29 %; this was obtained when the synthesis was performed at a solvent condition R (H2O/(H2O + EtOH)) = 0.25.
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12

Park, Yong-Kap, In-Churl Cho et Yong Choi. « Fabrication of Nano-Sized Emitting Phosphors for Photoluminescence Films via Hydro-Thermal Synthesis ». Journal of Nanoscience and Nanotechnology 11, no 7 (1 juillet 2011) : 6410–13. http://dx.doi.org/10.1166/jnn.2011.4382.

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13

Moon, S. M., et N. H. Cho. « Investigation of phase distribution in nanoscale BaTiO3 powders prepared by hydro-thermal synthesis ». Journal of Electroceramics 23, no 2-4 (25 septembre 2007) : 121–26. http://dx.doi.org/10.1007/s10832-007-9323-z.

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Chen, You Zhi, Fang Xian Li et Bing Bo Xu. « Use of Clayish Crushed Stone for Production of Aerated Concrete ». Key Engineering Materials 302-303 (janvier 2006) : 269–74. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.269.

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Aerated concrete is a new type of building materials. Clayish crushed stones are regarded as solid waste disposals in China. This paper reports the research outcomes of an experimental study on using clayish crushed stone for the production of aerated concretes of B05 and B06 grade. Hydro-thermal synthesis reaction, mixing proportions, gas-forming and their influences on the concrete performance are investigated. Proper mixing proportions and some important technical parameters are proposed for material design. The microstructure of aerated concrete made with clayish crush stone is analyzed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that the hydration products of clayish aerated concrete are composed of poor crystallized C-S-H (B), blade- and needle-shaped Tobermorite and a small amount of granular Hydrogarnet. A homogeneous and densified microstructure was obtained in the aerated concretes with negligible amount of clay after the hydro-thermal reaction in the mixture.
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15

Wang, Yang, Jin Song Zhang et Shi Yong Wu. « Research of Producing Aerated Concrete with Quartz Tail-Sands ». Applied Mechanics and Materials 357-360 (août 2013) : 786–89. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.786.

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The paper reports how to use quartz tail-sands to produce aerated concrete block. Through studying hydro-thermal synthesis reaction, gas-forming and performance analysis, satisfied mix ratios and optimal technical parameters are set successfully. The results show that utilizing quartz tail-sands can make aerated concrete production which is in accord with Chinese national standards. It fully reflects the requirements of environmental benefits and building energy efficiency.
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16

Burnett, David L., Mohammad H. Harunsani, Reza J. Kashtiban, Helen Y. Playford, Jeremy Sloan, Alex C. Hannon et Richard I. Walton. « Investigation of some new hydro(solvo)thermal synthesis routes to nanostructured mixed-metal oxides ». Journal of Solid State Chemistry 214 (juin 2014) : 30–37. http://dx.doi.org/10.1016/j.jssc.2013.10.050.

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17

Prasoetsopha, Natkrita, Supree Pinitsoontorn et Vittaya Amornkitbamrung. « Synthesis and thermoelectric properties of Ca3Co4O9 prepared by a simple thermal hydro-decomposition method ». Electronic Materials Letters 8, no 3 (juin 2012) : 305–8. http://dx.doi.org/10.1007/s13391-012-1088-0.

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18

Xu, L., X. Ch Zhang, W. G. Liu et B. Liu. « A 2D bitriazole-bridging copper(II) polymer : Hydro thermal synthesis, crystal structure, and fluorescence ». Journal of Structural Chemistry 53, no 1 (février 2012) : 179–83. http://dx.doi.org/10.1134/s0022476612010246.

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19

Yin, Dongguang, Kailin Song, Yangjuan Ou, Chengcheng Wang, Bing Liu et Minghong Wu. « Synthesis of NaYF4, NaLuF4 and NaGdF4-Based Upconversion Nanocrystals with Hydro (Solvo) Thermal Methods ». Journal of Nanoscience and Nanotechnology 13, no 6 (1 juin 2013) : 4162–67. http://dx.doi.org/10.1166/jnn.2013.7214.

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20

Su, Chunyan, Jia Liu, Changlu Shao et Yichun Liu. « Controlled synthesis of PAN/Ag2S composites nanofibers via electrospinning-assisted hydro(solvo)thermal method ». Journal of Non-Crystalline Solids 357, no 5 (mars 2011) : 1488–93. http://dx.doi.org/10.1016/j.jnoncrysol.2011.01.004.

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21

Tan, Yongjun, Xuedan Luo, Mingfu Mao, Dehua Shu, Wenfei Shan, Guizhi Li et Dongcai Guo. « Optimization red emission of SrMoO4 : Eu3+ via hydro-thermal co-precipitation synthesis using orthogonal experiment ». Current Applied Physics 18, no 11 (novembre 2018) : 1403–9. http://dx.doi.org/10.1016/j.cap.2018.08.005.

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22

Moon, S. M., et N. H. Cho. « Size effects on the crystal structure of nanoscale BaTiO3 powders prepared by hydro-thermal synthesis ». Metals and Materials International 13, no 4 (août 2007) : 329–33. http://dx.doi.org/10.1007/bf03027890.

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23

Kalijadis, Ana, Marina Maletic, Andjelika Bjelajac, Biljana Babic, Tamara Minovic-Arsic et Marija Vukcevic. « Influence of boron doping on characteristics of glucose-based hydrothermal carbons ». Journal of the Serbian Chemical Society, no 00 (2022) : 1. http://dx.doi.org/10.2298/jsc211011001k.

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In this study, the influence of boron doping on structural and surface properties of carbon material synthesized by a hydrothermal method was inves-tigated, and the obtained results were compared with the previously published influence that boron has on characteristics of carbonized boron-doped hydro-thermal carbons (CHTCB). Hydrothermal carbons doped with boron (HTCB) were obtained by the hydrothermal synthesis of glucose solutions with different nominal concentrations of boric acid. It was found that glucose based hydro-thermal carbon does not have developed porosity, and the presence of boron in their structure has insignificant influence on it. On the contrary, additional car-bonization increases the specific surface area of the undoped sample, while an increase in boron content drastically decreases the specific surface area. Boron doping leads to a decrease in the amount of surface oxygen groups, for both, hydrothermally synthesized and additionally carbonized materials. Raman ana-lysis showed that the boron content does not affect a structural arrangement of the HTCB samples, and Raman structural parameters show a higher degree of disorder, compared to the CHTCB samples. Comparison of structural and sur-face characteristics of hydrothermal carbons and carbonized materials contri-butes to the study of the so far, insufficiently clarified influence that boron incorporation has on the material characteristics.
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Li, Lingfang, Changling Fan, Weihua Zhang et Taotao Zeng. « Hydro-thermal synthesis of SnO2@hard-carbon ultrafine composites for anodic performances in lithium-ion batteries ». Materials Express 10, no 10 (31 octobre 2020) : 1677–84. http://dx.doi.org/10.1166/mex.2020.1832.

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Preparation of nano-structured SnO2@HC composites is an effective strategy to develop advanced tin-based anode materials for Li-ion batteries. In this study, cellulose with three-dimensional multi-layer structure was chosen as hard carbon source. An ultrafine composite of SnO2 and hard carbon, SnO2@HC, was prepared by hydro-thermal method. X Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), N2 adsorption–desorption technique, and electrochemical characterization were used to illustrate the microstructure, surface composition, pore features, and electrochemical performance of this composite. Results showed that in-situ growth of 3–5 nm SnO2 dots anchored on hard carbon particles formed a stable structure with abundant micropores and mesopores, which showed its good rate and cycle performance. The capacity stabilized at about 300 mAh/g after 10 cycles, at the current density of 200 mA/g. For the composite with Sn4+ to C molar ratio of 0.2:1, the discharge capacity was greater than 600 mAh/g at the current density of 50 mA/g, and 160 mAh/g capacity was released at 2 A/g.
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Kulesza, Joanna, Bráulio Silva Barros, Severino Alves Júnior, Carlos Alberto Fernandes de Oliveira, Dulce Maria de Araújo Melo et Jaroslaw Chojnacki. « Benzene-induced hydro(solvo)thermal synthesis of Cu2+ and Zn2+ coordination polymers based on 1,3-benzenedicarboxylate ». Materials Chemistry and Physics 143, no 3 (février 2014) : 1522–27. http://dx.doi.org/10.1016/j.matchemphys.2013.12.014.

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El-Geassy, A. A., K. S. Abdel Halim et Abdulaziz S. Alghamdi. « A Novel Hydro-Thermal Synthesis of Nano-Structured Molybdenum-Iron Intermetallic Alloys at Relatively Low Temperatures ». Materials 16, no 7 (29 mars 2023) : 2736. http://dx.doi.org/10.3390/ma16072736.

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Nano-structured Mo/Fe intermetallics were synthesized from precursors that contained 72/28% and 30/70% molar ratios of Mo/Fe, which were given as precursors A and B, respectively. These precursors were prepared from the co-precipitation of aqueous hot solutions of ammonium heptamolybdate tetrahydrate (AHM) and ferrous oxalate. The dry precipitates were thermally treated using TG-DSC to follow up their behavior during roasting, in an Ar atmosphere of up to 700 °C (10° K/min). The TG profile showed that 32.5% and 55.5% weight losses were measured from the thermal treatment of precursors A and B, respectively. The DSC heat flow profile showed the presence of endothermic peaks at 196.9 and 392.5–400 °C during the thermal decomposition of the AHM and ferrous oxalate, respectively. The exothermic peak that was detected at 427.5 °C was due to the production of nano-sized iron molybdate [Fe2(MoO4)3]. An XRD phase analysis indicated that iron molybdate was the only phase that was identified in precursor A, while iron molybdate and Fe2O3 were produced in precursor B. Compacts were made from the pressing of the nano-sized precursors, which were roasted at 500 °C for 3 h. The roasted compacts were isothermally reduced in H2 at 600–850 °C using microbalance, and the O2 weight loss that resulted from the reduction reactions was continuously recorded as a function of time. The influence of the reduction temperature and precursor composition on the reduction behavior of the precursors was studied and discussed. The partially and completely reduced compacts were examined with X-ray powder diffraction (XRD), a reflected light microscope (RLM), and a scanning electron microscope (SEM-EDS). Depending on the precursor composition, the reduction reactions of the [Fe2(MoO4)3] and Fe2O3 proceeded through the formation of intermediate lower oxides, prior to the production of the MO/Fe intermetallic alloys. Based on the intermediate phases that were identified and characterized at the early, intermediate, and final reduction degrees, chemical reaction equations were given to follow up the formation of the MoFe and MoFe3 intermetallic alloys. The mechanism of the reduction reactions was predicted from the apparent activation energy values (Ea) that were computed at the different reduction degrees. Moreover, mathematical formulations that were derived from the gas–solid reaction model were applied to confirm the reduction mechanisms, which were greatly dependent on the precursor composition and reduction temperature. However, it can be reported that nano-structured MoFe and MoFe3 intermetallic alloys can be successfully fabricated via a gas–solid reaction technique at lower temperatures.
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Jarkin, Vladimir N., Oleg A. Kisarin et Tatyana V. Kritskaya. « Methods of trichlorosilane synthesis for polycrystalline silicon production. Part 1 : Direct synthesis ». Modern Electronic Materials 7, no 1 (30 mars 2021) : 1–10. http://dx.doi.org/10.3897/j.moem.7.1.64953.

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Novel technical solutions and ideas for increasing the yield of solar and semiconductor grade polycrystalline silicon processes have been analyzed. The predominant polycrystalline silicon technology is currently still the Siemens process including the conversion of technical grade silicon (synthesized by carbon-thermal reduction of quartzites) to trichlorosilane followed by rectification and hydrogen reduction. The cost of product silicon can be cut down by reducing the trichlorosilane synthesis costs through process and equipment improvement. Advantages, drawbacks and production cost reduction methods have been considered with respect to four common trichlorosilane synthesis processes: hydrogen chloride exposure of technical grade silicon (direct chlorination, DC), homogeneous hydration of tetrachlorosilane (conversion), tetrachlorosilane and hydrogen exposure of silicon (hydro chlorination silicon, HC), and catalyzed tetrachlorosilane and dichlorosilane reaction (redistribution of anti-disproportioning reaction). These processes remain in use and are permanently improved. Catalytic processes play an important role on silicon surface, and understanding their mechanisms can help find novel applications and obtain new results. It has been noted that indispensable components of various equipment and process designs are recycling steps and combined processes including active distillation. They provide for the most complete utilization of raw trichlorosilane, increase the process yield and cut down silicon cost.
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Zhang, Xia, Cui Xia Yan et Rong Feng Guan. « Study on Different Synthesis Methods of Spherical YAG:Ce3+ Phosphor and its Luminescence Properties ». Advanced Materials Research 1088 (février 2015) : 371–76. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.371.

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Spherical YAG:Ce3+phosphors were synthesized by three different routes namely sol-gel method, co-precipitation method and solvethermal method. The microstructure, crystallization and luminescent properties of the phosphors were studied in order to find the best processing parameter for spherical shape and good luminescence properties of YAG:Ce3+phosphor. Adding citric acid to the precursor solution resulted in the formation of spherical particles in sol-gel method. YAG:Ce3+phosphor made by co-precipitation method was separated with PEG2000, and its spherical particles of size was around 500nm. The hydro-thermal method could get perfect spherical appearance, but it needed heat treatment improve the luminescence property.
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Jiang, Yu Zhi, Yue Xin Han, Wan Zhong Yin et Yan Bo Li. « Study on Process and Mecahnism for Preparation of Magnesium Hydroxide Whiskers ». Advanced Materials Research 92 (janvier 2010) : 247–54. http://dx.doi.org/10.4028/www.scientific.net/amr.92.247.

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Taking alkaline magnesium sulfate whiskers and sodium hydroxide as raw materials, the proper process parameters were experimentally investigated for magnesium hydroxide whiskers preparation by hydro-thermal synthesis. The experimental results show that satisfactory product of magnesium hydroxide whiskers can be obtained under the proper synthesis conditions. The whiskers are characterized with smooth surface, straight morphology, and small diameter. The whisker product of magnesium hydroxide is of less than 0.5μm in diameter, around 100 in slenderness ratio, and 99.69% in purity under the condition of 4.0% initial concentration of alkaline magnesium sulfate whisker, stirring intensity of 100rpm, reaction temperature at 180°C, and reaction time of 4h. The synthetic mechanism of the whiskers was analyzed by the theories of anion coordination polyhedron nucleation and screw dislocation growth of the crystal.
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Zhang, Fuwei, Zifeng Li, Tiezhu Ge, Hongchang Yao, Gang Li, Huijie Lu et Yanyan Zhu. « Four Novel Frameworks Built by Imidazole-Based Dicarboxylate Ligands : Hydro(Solvo)thermal Synthesis, Crystal Structures, and Properties ». Inorganic Chemistry 49, no 8 (19 avril 2010) : 3776–88. http://dx.doi.org/10.1021/ic902483m.

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Min, Boram, S. M. Moon et N. H. Cho. « Structural and dielectric features of Nb-doped nano-sized BaTiO3 powders prepared by hydro-thermal synthesis methods ». Current Applied Physics 11, no 3 (mai 2011) : S193—S196. http://dx.doi.org/10.1016/j.cap.2011.01.035.

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Shiv Halasyamani, P., Mark J. Drewitt et Dermot O’Hare. « Hydro(solvo)thermal synthesis and structure of a three-dimensional zinc fluorophosphate : Zn2(4,4′-bipy)(PO3F)2 ». Chemical Communications, no 9 (1997) : 867–68. http://dx.doi.org/10.1039/a701253e.

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Moon, S. M., et Nam Hee Cho. « Synthesis and Structural Investigation of Nano-Sized BaTiO3 Powders ». Materials Science Forum 510-511 (mars 2006) : 426–29. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.426.

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~100 nm-sized BaTiO3 powders were prepared by hydro-thermal techniques, and the structural features of the powders were investigated as a function of synthesis temperature and time. The spectral features of (200) XRD peaks and FT-Raman peaks at frequencies of 305 and 710 cm-1, which are sensitive to the presence of tetragonal BaTiO3, indicate that the nano-sized BaTiO3 powders are dominantly of a cubic phase, but the tetragonal phase is also exhibited at room temperature. The tetragonal and cubic phases exist in the core and shell regions in the powder, respectively; the difference in lattice spacing between the core and the shell regions is 0.061 Å, and the thickness of the cubic-phased shell region of the powders prepared at 180°C for 24 hrs is 3 nm.
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Balsamo, Stefano Andrea, Roberto Fiorenza, Marcello Condorelli, Roberta Pecoraro, Maria Violetta Brundo, Francesca Lo Presti et Salvatore Sciré. « One-Pot Synthesis of TiO2-rGO Photocatalysts for the Degradation of Groundwater Pollutants ». Materials 14, no 20 (10 octobre 2021) : 5938. http://dx.doi.org/10.3390/ma14205938.

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A non-conventional approach to prepare titanium dioxide-reduced graphene oxide (TiO2-rGO) nanocomposites based on solar photoreduction is here presented. The standard hydro-solvothermal synthesis of the TiO2-rGO composites requires high temperatures and several steps, whereas the proposed one-pot preparation allows one to obtain the photocatalysts with a simple and green procedure, by exploiting the photocatalytic properties of titania activated by the solar irradiation. The TiO2-rGO catalysts were tested in the solar photodegradation of a widely adopted toxic herbicide (2,4-Dichlorophenoxyacetic acid, 2,4-D), obtaining the 97% of degradation after 3 h of irradiation. The as-prepared TiO2-rGO composites were more active compared to the same photocatalysts prepared through the conventional thermal route. The structural, optical, and textural properties of the composites, determined by Raman, Photoluminescence, Fourier Transform InfraRed (FTIR), UV-vis diffuse reflectance (DRS) spectroscopies, and N2 absorption-desorption measurements, showed as the solar irradiation favors the reduction of graphene oxide with higher efficiency compared to the thermal-driven synthesis. Furthermore, the possible toxicity of the as-synthesized composites was measured exposing nauplii of microcrustacean Artemia sp. to solutions containing TiO2-rGO. The good results in the 2,4-D degradation process and the easiness of the TiO2-rGO synthesis allow to consider the proposed approach a promising strategy to obtain performing photocatalysts.
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Xing, Xiao Feng, Liang Liang Luo, Yu Ping Guo, Wei Min Gao et Liang Hu. « Synthesis and Characterization of Asparagine-Modified and Terbium-Doped Spherical Hydroxyapatite Nanoparticle ». Key Engineering Materials 697 (juillet 2016) : 62–66. http://dx.doi.org/10.4028/www.scientific.net/kem.697.62.

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The spherical hydroxyapatite nanoparticles (HAP) were synthesized by hydro-thermal method, and calcium nitrate, terbium oxide, diammonium hydrogen phosphate were used as raw materials with the help of surfactant L-Asparagine. Meanwhile, different amount of Tb was added to investigate the effect of different terbium dropping amount on the properties of HAP. The structure, morphology and luminescent of the obtained HAP that was characterized via X-ray powder diffraction (XRD), fluorescence spectrometer (PL) and transmission electron microscope (TEM). Results showed that spherical HAP which in average of 30 nm with good dispersion showed remarkable fluorescent properties and their maximum emission were observed at 543 nm, which could be also excited at uv light region of 377 nm.The optimum mole fraction of Tb was 3%. Therefore terbium-doped spherical HAP of prepared sample would be tracked by flourescence.
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Kim, Kang Woo, et Mercouri G. Kanatzidis. « Hydro(methano)thermal synthesis and characterization of two new platinum polysulfides : [Pt4S22]4- and [Pt(S4)2]2- ». Inorganic Chemistry 32, no 19 (septembre 1993) : 4161–63. http://dx.doi.org/10.1021/ic00071a034.

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37

Zhao, Yu-Jing, et Fang Zhou. « Synthesis, Evolution of Morphology, Transport Properties for Bi2Te3 Nanoplates ». Crystals 12, no 11 (19 novembre 2022) : 1668. http://dx.doi.org/10.3390/cryst12111668.

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Bi2Te3 has an extensive application as thermoelectric materials. Here, large scale Bi2Te3 single-crystal hexagonal nanoplates(NPs) with size of 0.4–0.8 μm were synthesized successfully by hydro-thermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to characterize the Bi2Te3 nanoplates, which confirm the single crystal quality and smooth surface morphology with large size. We discussed the morphology-evolution in detail the influence of various reaction factors which including: the reaction temperature, the reaction time, the surfactants of the polyvinyl pyrrolidone (PVP) and pH value. The synthesis method is not only green, but also shortens the reaction time and improves the reaction efficiency. The Bi2Te3 nanopowders were hot-pressed into solid state pellets through spark plasma sintering (SPS). The values of the electrical conductivity σ were about 0.16 × 10−5 Sm−1 and 0.22 × 10−5 Sm−1 at room temperature and 530 K, respectively. The values of the Seebeck coefficient S were around −81 μVK−1 and −118 μVK−1 at room temperature and 530 K, respectively.
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38

Jarkin, V. N., O. A. Kisarin et T. V. Kritskaya. « Methods of trichlorosilane synthesis for polycrystalline silicon production ». Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 24, no 1 (20 avril 2021) : 5–26. http://dx.doi.org/10.17073/1609-3577-2021-1-5-26.

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Novel technical solutions and ideas for increasing the yield of solar and semiconductor grade polycrystalline silicon processes have been analyzed. The predominant polycrystalline silicon technology is currently still the Siemens process including the conversion of technical grade silicon (synthesized by carbon-thermal reduction of quartzites) to trichlorosilane followed by rectification and hydrogen reduction. The cost of product silicon can be cut down by reducing the trichlorosilane synthesis costs through process and equipment improvement. Advantages, drawbacks and production cost reduction methods have been considered with respect to four common trichlorosilane synthesis processes: hydrogen chloride exposure of technical grade silicon (direct chlorination, DC), homogeneous hydration of tetrachlorosilane (conversion), tetrachlorosilane and hydrogen exposure of silicon (hydro chlorination silicon, HC), and catalyzed tetrachlorosilane and dichlorosilane reaction (redistribution of anti-disproportioning reaction). These processes remain in use and are permanently improved. Catalytic processes play an important role on silicon surface, and understanding their mechanisms can help find novel applications and obtain new results. It has been noted that indispensable components of various equipment and process designs are recycling steps and combined processes including active distillation. They provide for the most complete utilization of raw trichlorosilane, increase the process yield and cut down silicon cost
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39

Song, Wen-Dong, Jian-Bin Yan, Hao Wang, Li-Li Ji, De-Yun Ma et Seik Weng Ng. « Hydro(solvo)thermal synthesis and structural characterization of three lanthanide–carboxylate coordination polymers based on BDC and/or EDTA ». Journal of Coordination Chemistry 63, no 4 (19 janvier 2010) : 625–33. http://dx.doi.org/10.1080/00958970903560056.

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40

KIM, K. W., et M. G. KANATZIDIS. « ChemInform Abstract : Hydro(methano)thermal Synthesis and Characterization of Two Platinum Polysulfides : (Pt4S22)4- and (Pt(S4)2)2-. » ChemInform 24, no 51 (19 août 2010) : no. http://dx.doi.org/10.1002/chin.199351029.

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41

Li, Xiaolong, Zhenluan Xue et Hongrong Liu. « Hydro-thermal synthesis of PEGylated Mn2+ dopant controlled NaYF4 : Yb/Er up-conversion nano-particles for multi-color tuning ». Journal of Alloys and Compounds 681 (octobre 2016) : 379–83. http://dx.doi.org/10.1016/j.jallcom.2016.04.204.

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42

Simovic, Bojana, Aleksandar Golubovic, Ivana Veljkovic, Dejan Poleti, Jelena Zdravkovic, Dusan Mijin et Andjelika Bjelajac. « Hydro- and solvothermally-prepared ZnO and its catalytic effect on photodegradation of reactive orange 16 dye ». Journal of the Serbian Chemical Society 79, no 11 (2014) : 1433–43. http://dx.doi.org/10.2298/jsc140520077s.

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In this work, zinc oxide powders were obtained by two different techniques: hydro- and solvothermal synthesis starting from Zn(NO3)2 and Zn(CH3COO)2, respectively. The influence of synthetic procedure on the structural, microstructural, thermal and photocatalytic properties of the prepared ZnO powders was investigated. Both ZnO samples were further annealed at moderate conditions (300?C) to avoid grain growth and to remove traces of impurities. In all four cases a single-phase hexagonal ZnO was confirmed by X-ray powder diffraction. The morphology of prepared ZnO powders was different and it varied from rounded nanograins to microrods. All prepared samples showed higher photocatalytic efficiency in degradation of textile azo-dye Reactive Orange 16(RO16) than the commercial ZnO. In addition, the non-annealed samples had better photocatalytic properties than the commercial Degussa P25 TiO2 powder.
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43

Jarkin, Vladimir N., Oleg A. Kisarin et Tatyana V. Kritskaya. « Methods of trichlorosilane synthesis for polycrystalline silicon production. Part 2 : Hydrochlorination and redistribution ». Modern Electronic Materials 7, no 2 (30 juin 2021) : 33–43. http://dx.doi.org/10.3897/j.moem.7.2.65572.

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Novel technical solutions and ideas for increasing the yield of solar and semiconductor grade polycrystalline silicon processes have been analyzed. The predominant polycrystalline silicon technology is currently still the Siemens process including the conversion of technical grade silicon (synthesized by carbon-thermal reduction of quartzites) to trichlorosilane followed by rectification and hydrogen reduction. The cost of product silicon can be cut down by reducing the trichlorosilane synthesis costs through process and equipment improvement. Advantages, drawbacks and production cost reduction methods have been considered with respect to four common trichlorosilane synthesis processes: hydrogen chloride exposure of technical grade silicon (direct chlorination, DC), homogeneous hydration of tetrachlorosilane (conversion), tetrachlorosilane and hydrogen exposure of silicon (hydro chlorination silicon, HC), and catalyzed tetrachlorosilane and dichlorosilane reaction (redistribution of anti-disproportioning reaction). These processes remain in use and are permanently improved. Catalytic processes play an important role on silicon surface, and understanding their mechanisms can help find novel applications and obtain new results. It has been noted that indispensable components of various equipment and process designs are recycling steps and combined processes including active distillation. They provide for the most complete utilization of raw trichlorosilane, increase the process yield and cut down silicon cost.
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44

Vieira, Ana, Maria Alberdi-Pagola, Paul Christodoulides, Saqib Javed, Fleur Loveridge, Frederic Nguyen, Francesco Cecinato et al. « Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications ». Energies 10, no 12 (3 décembre 2017) : 2044. http://dx.doi.org/10.3390/en10122044.

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Increasing use of the ground as a thermal reservoir is expected in the near future. Shallow geothermal energy (SGE) systems have proved to be sustainable alternative solutions for buildings and infrastructure conditioning in many areas across the globe in the past decades. Recently novel solutions, including energy geostructures, where SGE systems are coupled with foundation heat exchangers, have also been developed. The performance of these systems is dependent on a series of factors, among which the thermal properties of the soil play a major role. The purpose of this paper is to present, in an integrated manner, the main methods and procedures to assess ground thermal properties for SGE systems and to carry out a critical review of the methods. In particular, laboratory testing through either steady-state or transient methods are discussed and a new synthesis comparing results for different techniques is presented. In situ testing including all variations of the thermal response test is presented in detail, including a first comparison between new and traditional approaches. The issue of different scales between laboratory and in situ measurements is then analysed in detail. Finally, the thermo-hydro-mechanical behaviour of soil is introduced and discussed. These coupled processes are important for confirming the structural integrity of energy geostructures, but routine methods for parameter determination are still lacking.
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Zheng, Mingtao, Haoran Zhang, Yong Xiao, Hanwu Dong, Yingliang Liu, Ruchun Xu, Yinke Hu, Baoyi Deng, Bingfu Lei et Xiaotang Liu. « Large-scale synthesis and enhanced hydrogen storage of monodispersed sulfur-doped carbon microspheres by hydro-sulfur-thermal carbonization of starch ». Materials Letters 109 (octobre 2013) : 279–82. http://dx.doi.org/10.1016/j.matlet.2013.05.073.

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Meng, Sopheak, Takaya Ogawa, Keiichi N. Ishihara et Hideyuki Okumura. « Band Engineering of Photocatalytic BiVO4 with Modified Vanadium States via Potassium Chloride Addition during Hydro-Thermal Synthesis and Post-Annealing ». Energies 16, no 2 (4 janvier 2023) : 629. http://dx.doi.org/10.3390/en16020629.

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The monoclinic BiVO4 in a powder state was prepared via a hydrothermal method, with the addition of KCl as a structure-directing agent. The as-prepared sample was calcined at different temperatures (400–600 °C), either in the air or in Ar gas. It is found that, though the morphology and crystal structure mostly remain unchanged, the bandgap properties are modified during calcination. A detailed analysis of the surface chemical states and optical absorption properties reveals the involvement of tetravalent vanadium ions and oxygen vacancies as the cause of the band modification. The bandgap properties are to be found tunable via changing the calcination condition, as well as the KCl concentration in the precursor. The photocatalytic properties of BiVO4 samples are greatly enhanced with the addition of KCl in the precursor, but degraded by post-annealing, where the residual Cl in the calcined sample may act as an inhibitor. The enhanced photoactivity is explained in terms of favorable faceting, bandgap modification, and heterojunction of BiVO4/BiOCl.
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47

Zhang, Xiao-Min, Xue-Feng Feng, Jian-Qiang Li et Feng Luo. « Synthesis, Structures, and Properties of Four Novel HgII Complexes Based on Pyridine Acylamide Ligands ». Australian Journal of Chemistry 68, no 1 (2015) : 80. http://dx.doi.org/10.1071/ch14110.

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In this work we synthesised four new pyridine acylamide complexes [HgI2(L1)] (1) and (2), [HgI2(L2)2] (3), and [HgI2(L3)]n (4) (L1 = N,N′-bis(3-pyridylmethyl)benzene-1,4-dicarboxamide, L2 = N4,N4′-bis(pyridin-3-yl)-[1,1′-biphenyl]-4,4′-dicarboxamide, L3 = N1,N3-bis(pyridin-3-ylmethyl)isophthalamide) by solvo(hydro)thermal reaction. Compounds 1 and 2 are supramolecular isomers prepared via variation of the reaction solvent, in which the HgII centres are bridged by L1 ligands to form one-dimensional (1D) helical chain or 1D meso-helical chain, respectively. Careful inspection of the structures reveal that formation of the isomers are mainly induced by the distinct configuration of L1 ligand and slight differences in coordination geometry of the HgII ions. Complex 3 shows a novel Z-shaped zero-dimensional structure with a L2–HgI2–L2–HgI2–L2 arrangement. In complex 4, flexible L3 ligands link HgI2 units to construct a 1D helical chain with an overall chiral structure, derived from spontaneous resolution. Luminescence properties of these four novel complexes were also explored.
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48

Gangaiah, Vijaya Kumar, Ashoka Siddaramanna, Prashanth Shivappa Adarakatti et Gujjarahalli Thimanna Chandrappa. « Controllable Synthesis of h-WO3 Nanoflakes by L-lysine Assisted Hydrothermal Route and Electrochemical Characterization of Nanoflakes Modified Glassy Carbon Electrode ». Materials Physics and Chemistry 1, no 1 (21 septembre 2018) : 7. http://dx.doi.org/10.18282/mpc.v1i1.567.

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<p>Hexagonal tungsten trioxide (h-WO3) nanoflakes have been synthesized by a hydrothermal approach using L-lysine as the shape directing agent. The influence of hydrothermal reaction time and L-lysine content on the morphology of h-WO3 was investigated. The experimental results showed that the nanoflake morphology could be achieved at higher concentration of L-lysine. Based on the evolution of nanoflake morphology as a function of hydro-thermal duration, a “dissolution-crystallization-Ostwald ripening” growth mechanism has been proposed. The electro-chemical performance of h-WO3 nanoflakes has also been investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that h-WO3 modified glassy carbon electrode (GCE) showed lower charge transfer resistance and enhancement in peak current attributed to the enrichment in electroactive surface area and faster electron transfer kinetics at h-WO3 modified GCE.</p>
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49

Tang, Wei, Jie Jian, Gen Chen, Wenjuan Bian, Jiuling Yu, Haiyan Wang, Meng Zhou, Dong Ding et Hongmei Luo. « Carbon Nanotube Supported Amorphous MoS2 via Microwave Heating Synthesis for Enhanced Performance of Hydrogen Evolution Reaction ». Energy Material Advances 2021 (8 janvier 2021) : 1–8. http://dx.doi.org/10.34133/2021/8140964.

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Amorphous molybdenum disulfide (MoS2) is a promising electrochemical catalyst for hydrogen evolution reaction (HER) due to more active sites exposed on the surface compared to its crystalline counterpart. In this study, a novel fast three-minute one-pot method is proposed to prepare the single-wall carbon nanotube- (SWCNT-) supported amorphous MoS2 via a microwave heating process. Compared to traditional hydro- or solvent thermal methods to prepare MoS2 which usually consume more than 10 hours, it is more promising for fast production. An overpotential at 10 mA/cm2 of amorphous MoS2@SWCNT is 178 mV, which is 99 mV and 22 mV lower than crystalline MoS2@SWCNT and pure amorphous MoS2, respectively. After running 1000 cycles of polarization, ~2% increase in overpotential is observed, indicating its good stability. The enhanced performance results from the beneficial combination of the SWCNT substrate and the amorphous microstructures. The introduction of SWCNT increases catalyst conductivity and prevents MoS2 aggregation. The amorphous microstructures of MoS2 prepared by a microwave heating method lead to more Mo edges or active sites exposed.
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50

Tang, Wei, Jie Jian, Gen Chen, Wenjuan Bian, Jiuling Yu, Haiyan Wang, Meng Zhou, Dong Ding et Hongmei Luo. « Carbon Nanotube Supported Amorphous MoS2 via Microwave Heating Synthesis for Enhanced Performance of Hydrogen Evolution Reaction ». Energy Material Advances 2021 (8 janvier 2021) : 1–8. http://dx.doi.org/10.34133/2021/8140964.

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Amorphous molybdenum disulfide (MoS2) is a promising electrochemical catalyst for hydrogen evolution reaction (HER) due to more active sites exposed on the surface compared to its crystalline counterpart. In this study, a novel fast three-minute one-pot method is proposed to prepare the single-wall carbon nanotube- (SWCNT-) supported amorphous MoS2 via a microwave heating process. Compared to traditional hydro- or solvent thermal methods to prepare MoS2 which usually consume more than 10 hours, it is more promising for fast production. An overpotential at 10 mA/cm2 of amorphous MoS2@SWCNT is 178 mV, which is 99 mV and 22 mV lower than crystalline MoS2@SWCNT and pure amorphous MoS2, respectively. After running 1000 cycles of polarization, ~2% increase in overpotential is observed, indicating its good stability. The enhanced performance results from the beneficial combination of the SWCNT substrate and the amorphous microstructures. The introduction of SWCNT increases catalyst conductivity and prevents MoS2 aggregation. The amorphous microstructures of MoS2 prepared by a microwave heating method lead to more Mo edges or active sites exposed.
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