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Microemulsion Method (microemulsion + method)
Selected AbstractsSynthesis of CdS Micorpheres by a Hydrothermal Microemulsion MethodCHINESE JOURNAL OF CHEMISTRY, Issue 9 2005Sheng Xu Abstract CdS micropheres were prepared by a hydrothermal microemulsion method in cyclohexane/Triton X-100/pentanol/water at 180 °C. The as-prepared samples were characterized by X-ray diffraction analysis, transmission electron microscopy, electron diffraction, energy diffraction X-ray analysis and photoluminescence spectra. It was found that CdS microspheres with diameter of 1.5,2.5µm were aggregated by nanocrystals. The formation mechanism was proposed. [source] Enhanced dechlorination of trichloroethylene by membrane-supported Pd-coated iron nanoparticlesENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY, Issue 2 2008Linfeng Wu Abstract In this study, cellulose acetate (CA) supported iron and Pd/Fe nanoparticles were used for dechlorination of trichloroethylene (TCE) from water. Solution and microemulsion methods were used to synthesize the iron nanoparticles. Pd/Fe bimetallic particles were prepared by postcoating Pd on the prepared iron nanoparticles. These materials were then dispersed in CA solution, which was used to prepare the membrane-supported nanoparticles. TEM imaging confirmed that the iron and Pd/Fe bimetallic nanoparticles were ,10 nm in diameter. The results of dechlorination studies showed that the surface composition of the Pd/Fe bimetallic nanoparticles (microemulsion method) significantly affected the observed reduction rate constant. In addition, the rate constant was a nonlinear function of metal loading and initial TCE concentration. A comparative study for the Pd/Fe (Pd 1.9 wt %) nanoparticles from solution and microemulsion methods showed that the nanoparticles formed by the latter method gave superior performance for the dechlorination of TCE. © 2008 American Institute of Chemical Engineers Environ Prog, 2008 [source] Nanohybrid material of bilateral switch based on diaryletheneJOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 11 2007Ying Zou Abstract Air-stable hybrid organic,inorganic nanoparticles were prepared, comprising photochromic cationic diarylethene species intercalated in layered MnPS3 by using a microemulsion method. The prepared hybrid material exhibited typical photochromic and fluorescent switch behavior similar to that in solution. Although its response to light was less sensitive, the hybrid material reduced the effect of solvents on its photochromism, and afforded a new approach to the application of molecular switch in solid. Copyright © 2007 John Wiley & Sons, Ltd. [source] XANES study on the valence transitions in cerium oxide nanoparticlesJOURNAL OF SYNCHROTRON RADIATION, Issue 2 2001Jing Zhang The aim of this work is the determination of Ce environment and valence state in cerium oxide nanoparticles prepared by the microemulsion method. X-ray absorption near-edge structure measurements at Ce L3 edge were performed on the nanoparticles as a function of annealing temperature, ranging from 298K to 873K under air condition. The experimental results support the conclusion that Ce ion, in the investigated systems, is in trivalence state when the annealing temperature is below 473K. As the temperature increases up to 623K, the XANES spectrum shows the coexistence of Ce3+ and Ce4+states. When the temperature is higher than 623K, the spectra become identical to that of CeO2 with a distinct double-peak structure, corresponding to the Ce4+ state. [source] Bionanotechnology based on silica nanoparticlesMEDICINAL RESEARCH REVIEWS, Issue 5 2004Weihong Tan Abstract We have developed uniform core/shell nanoparticles, consisting of a silica layer coating and pigments or magnetite core, using a water-in-oil microemulsion method. The nanoparticles are highly luminescent and photostable with the size ranging from 5 nm to 400 nm. Bioconjugation of these silica nanoparticles adds unique biofunctions with various molecules such as enzymes, antibodies, and DNA molecules. Significant advantages have been shown in using bioconjugated nanoparticles for biosensing and bioimaging, such as cell staining, DNA detection and separation, rapid single bacterium detection, and biotechnological application in DNA protection. © 2004 Wiley Periodicals, Inc. Med Res Rev, 24, No. 5, 621,638, 2004 [source] Synthesis of CdS Micorpheres by a Hydrothermal Microemulsion MethodCHINESE JOURNAL OF CHEMISTRY, Issue 9 2005Sheng Xu Abstract CdS micropheres were prepared by a hydrothermal microemulsion method in cyclohexane/Triton X-100/pentanol/water at 180 °C. The as-prepared samples were characterized by X-ray diffraction analysis, transmission electron microscopy, electron diffraction, energy diffraction X-ray analysis and photoluminescence spectra. It was found that CdS microspheres with diameter of 1.5,2.5µm were aggregated by nanocrystals. The formation mechanism was proposed. [source] | ||||||||||