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Molten Salts (molten + salt)
Terms modified by Molten Salts Selected AbstractsMolten Salt as a Green Reaction Medium: Efficient and Chemoselective Dithioacetalization and Oxathioacetalization of Aldehydes Mediated by Molten Tetrabutylammonium Bromide.CHEMINFORM, Issue 38 2004Brindaban C. Ranu Abstract For Abstract see ChemInform Abstract in Full Text. [source] Multi-component fitting XAFS analysis of molybdate species during catalyst preparation by the molten salt methodJOURNAL OF SYNCHROTRON RADIATION, Issue 2 2001Nobuyuki Matsubayashi The goal of the present study was to elucidate the formation mechanisms of highly dispersed catalysts by the molten salt method. For this purpose, multi-component fitting Mo K-edge EXAFS analysis was applied to the structure of molybdate catalysts prepared in KNO3 and NaNO3. The analysis revealed that MoO3 dissolved in molten salts was at first transformed into polymolybdate anions and finally into MoO42- anions. The transformation into MoO42- anions took place at a lower temperature when NaNO3 was used as molten salt than KNO3. In contrast, polymolybdate anions were stable even at higher temperature when ZrO2 was added as a support of molybdate. [source] Synthesis of Micron-Scale Platelet BaTiO3JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 4 2007Dan Liu Micron-scale platelet barium titanate was synthesized using a twostep molten salt and topochemical technique. Plate-like BaBi4Ti4O15 was first synthesized as a precursor by molten salt synthesis. Then, Bi3+ in the precursor was replaced by Ba2+ and formed perovskite-structure BaTiO3 through a topochemical reaction. The BaTiO3 single crystals have an average size of 5,10 ,m and a thickness of 0.5 ,m. The purpose of this article is to control the particle shape with desired structure. High aspect ratio BaTiO3 platelets are suitable templates to obtain textured ceramics (especially Pb(Mg1/3Nb2/3)O3,32.5PbTiO3) by the templated grain growth process. [source] Preparation of Inorganic Materials Using Ionic LiquidsADVANCED MATERIALS, Issue 2 2010Zhen Ma Abstract Conventional synthesis of inorganic materials relies heavily on water and organic solvents. Alternatively, the synthesis of inorganic materials using, or in the presence of, ionic liquids represents a burgeoning direction in materials chemistry. Use of ionic liquids in solvent extraction and organic catalysis has been extensively studied, but their use in inorganic synthesis has just begun. Ionic liquids are a family of non-conventional molten salts that can act as templates and precursors to inorganic materials, as well as solvents. They offer many advantages, such as negligible vapor pressures, wide liquidus ranges, good thermal stability, tunable solubility for both organic and inorganic molecules, and much synthetic flexibility. In this Review, the use of ionic liquids in the preparation of several categories of inorganic and hybrid materials (i.e., metal structures, non-metal elements, silicas, organosilicas, metal oxides, metal chalcogenides, metal salts, open-framework structures, ionic liquid-functionalized materials, and supported ionic liquids) is summarized. The status quo of the research field is assessed, and some future perspectives are furnished. [source] A promising method for electrodeposition of aluminium on stainless steel in ionic liquidAICHE JOURNAL, Issue 3 2009Guikuan Yue Abstract A promising method for aluminium deposition was proposed by using AlCl3/[bmim]Cl (1-butyl-3-methylimidazolium chloride) ionic liquid as electrolyte. By using this novel method, the volatile and flammable organic solvent systems and the high corrosive inorganic molten salts with high temperature can be substituted, and the deposit microstructure can be easily adjusted by changing the current density, temperature and electrolyte composition. The study was performed by means of galvano-static electrolysis and the optimum operating conditions were determined based on the systematic studies of the effects of current density, temperature, molar ratio of AlCl3 to [bmim]Cl, stirring speed and deposition time on the quality of deposited coatings. The electrical conductivities of electrolytes were also investigated as a function of temperature (298,358 K) and molar ratio of AlCl3 to [bmim]Cl (from 0.1:1 to 2.0:1). Dense, bright and adherent aluminium coatings were obtained over a wide range of temperature (298,348 K), current densities (8,44 mA/cm2) and molar ratio (1.6:1,2.0:1). Results from the analysis of crystal structure show that all of the electrodeposits exhibit a preferred (200) crystallographic orientation. Temperature has significant influence on the crystallographic orientation and there does not appear to be an apparent impact of current density on it. Analyses of the chronoamperograms indicate that the deposition process of aluminium on stainless steel was controlled by three-dimension nucleation with diffusion-controlled growth and there is a conversion from progressive nucleation to instantaneous nucleation. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source] XAFS analysis of corroded metal surfaces with molten salts by conversion-electron-yield methodJOURNAL OF SYNCHROTRON RADIATION, Issue 2 2001Etsuya Yanase We have measured XAFS spectra of metal surfaces corroded with melting salt (NaCl, KCl, and Na2SO4). Steel samples used were S45C, SCM435, SUS310S, and SUS304. We measured the Fe K-edge XAFS spectra for all samples and the Ni K-edge for SUS310S and SUS304 samples before and after the corrosion. The XANES spectra of samples before the corrosion show metallic structure because surface oxide thickness is thinner than probing depth with a conversion yield XAFS method. Each result of these XAFS spectra gives good agreements with the FEFF calculation in the assumption of bcc and/or fcc structure. The Fe K-edge spectra of steel samples except SUS310S after corroded treatment show existence bonding between Fe and another light element although the spectra of SUS310S samples before and after corroded treatment are much the same. Keywords: metal, molten salts, corrosion. [source] Multi-component fitting XAFS analysis of molybdate species during catalyst preparation by the molten salt methodJOURNAL OF SYNCHROTRON RADIATION, Issue 2 2001Nobuyuki Matsubayashi The goal of the present study was to elucidate the formation mechanisms of highly dispersed catalysts by the molten salt method. For this purpose, multi-component fitting Mo K-edge EXAFS analysis was applied to the structure of molybdate catalysts prepared in KNO3 and NaNO3. The analysis revealed that MoO3 dissolved in molten salts was at first transformed into polymolybdate anions and finally into MoO42- anions. The transformation into MoO42- anions took place at a lower temperature when NaNO3 was used as molten salt than KNO3. In contrast, polymolybdate anions were stable even at higher temperature when ZrO2 was added as a support of molybdate. [source] | |||||||||||||