نتایج جستجو برای: supercritical hydrothermal synthesis

تعداد نتایج: 432597  

Journal: :iranian journal of catalysis 2012
seyed javad ahmadi morteza hosseinpour mohammad outokesh

in our current study, supercritical water impregnation (scwi) was introduced as a unique catalyst preparation method by employing the high diffusivity property of supercritical water. the method allows nano-particles to place on support surfaces in extremely dispersed conditions. the silica-based nanocatalyst granules for this purpose were prepared by initial impregnation of highly porous silic...

Journal: :Angewandte Chemie 2012
Christoffer Tyrsted Kirsten Marie Ørnsbjerg Jensen Espen Drath Bøjesen Nina Lock Mogens Christensen Simon J L Billinge Bo Brummerstedt Iversen

Supercritical growth: The formation and evolution of ceria nanoparticles during hydrothermal synthesis was investigated by in situ total scattering and powder diffraction. The nucleation of pristine crystalline ceria nanoparticles originated from previously unknown cerium dimer complexes. The nanoparticle growth was highly accelerated under supercritical conditions.

2010
Hiromichi Hayashi Yukiya Hakuta

This paper summarizes specific features of supercritical hydrothermal synthesis of metal oxide particles. Supercritical water allows control of the crystal phase, morphology, and particle size since the solvent's properties, such as density of water, can be varied with temperature and pressure, both of which can affect the supersaturation and nucleation. In this review, we describe the advantag...

2010
V. I. Anikeev

Continuous hydrothermal synthesis of metal oxide nanoand microparticles in supercritical water was performed in a continuous flow reactor. The results of investigation of LiCoO2, LiNiO2, LiZnO2, LiCuO2, Ga2O3, CeO2 nanoparticles by HRTEM and XRD analysis were presented.

Journal: :Journal of the Japan Society of Powder and Powder Metallurgy 2019

Journal: :Journal of the Japan Society of Powder and Powder Metallurgy 2007

Journal: :Acta Crystallographica Section A Foundations of Crystallography 2008

Supercritical fluid (SCF) technology has become an important tool of materials processing in the lasttwo decades. Supercritical CO2 and H2O are extensively being used in the preparation of a great variety ofnanomaterials. The greatest requirement in the application of nanomaterials is its size and morphology control, which determine the application potential of the nanoparticles, as...

Journal: :international journal of bio-inorganic hybrid nanomaterials 0

cobalt ferrite nano-powder have been obtained through a hydrothermal method with 2:1 molar ratio of fe:co without using any surfactant. x-ray diffraction (xrd) and scanning electron microscopy (sem) were used to consider the structural and morphological properties of cofe2o4 nano-particles. also, edax spectroscopy applied to evaluate the chemical composition. results demonstrated that 15 hr hyd...

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