Ion beam co-sputtering technique is used to deposit Au-SiO_2 nanocomposite films on quartz at room temperature.

Abstraction of Gold,Platinum and Palladium from Platinum and Palladium Concentrate;

Strengthening of Gold via Alloying Elements;

Gold is adsorbed by a polyurethane foam loaded with Methy1 isobuty1 ketone from a 5%~25% aqua regia medium, the adsorbed gold is eluted with 2% thiourea 1% hydrochloric solution.

The factors influencing the modifying efficiency,such as amount of modifier,modifying time,rotating speed of the mill and ratio of ball and silica,were discussed.

Core/shell composite microparticles with silica nanoparticle as core and crosslinked poly(tert-butylmethacrylate) as shell were prepared by seed-emulsion polymerization utilizing 3-(trimethoxysilyl)propyl methacrylate(MPS) modified silica particles as seeds,tert-butylmethacrylate as monomer and sodium dodecyl sulfate(SDS) as emulsifier.

By using of the alkalinity catalyst of ammonia and controlling the water content, the ethyl-orthosilicate occured hydrolytic reaction to form nano-silica dispersed in ethanol, then washed, dried and silica nanoparticles were prepared.

The effects of non-aqueous ball milling on the structure and properties of modified silicon dioxide particles were investigated using X-ray powder diffraction, particle size analysis and zeta potential analysis, etc.

The application of nano-particles,such as zinc oxide and silicon dioxide,in the ultraviolet radiation shield coatings is summarizes in this paper.

Purpose To study the expression and translocation of nuclear transcription factor Sp1 in type Ⅱ pneumocytes (A549) after stimulated by silicon dioxide in vivo and in vitro and to discuss the role which nuclear transcription factor Sp1 played in the development of silicosis.

PECVD SiO_2 Layers on AlGaN/GaN Mental Oxide Semiconductor Heterostructure Field-Effect Transistor;

The nanocomposite particles of NiFe_2O_4-SiO_2 are synthesized.

In view of little protection against UV radiation for which cotton fabrics can provide,prepared nano-TiO_2 and nano-SiO_2 by micro-emulsion method so that the resultant nanometer powder had good dispersing property and very fine particles.

Nanometer SiO 2 film is coated on the activated micrometer Al powder.

The change of SiO 2 content with aging time is mensurated by X-ray fluorescence(XRF).

Silica sols were prepared by hydrolysis of Si(OC 2H 5) 4 (TEOS) using HCl, NH 3·H 2O, HCl/NH 3·H 2O as catalyzers, and the different granularities of SiO 2 sols which catalyzed by HCl first and then NH 3·H 2O have the same terminal pH value were prepared.