In natural powdery Quartz the content of SiO2 is high 98.7%～99.3%,but the content of Fe2O3 is low 0.03%～0.04%. Its price is a half of the price of artificial quartz powder. The smear of paint prepared with natural powdery quartz and water grass is lighter 0.47～0.52 g.
Preparation and Evaluation of 3,5-Dinitrobenzoyl-Bonded Silica Gel Stationary Phase for HPLC
In this paper, a new preparation method of 3,5-dinitrobenzoyl-bonded silica gel stationary phase (DNB) for HPLC was developed by using N-(β-aminoethyl)-γ-aminopropyl-methyldimethoxy silane as coupling reagent.
The samples were extracted with methanol-water (volume ratio), The extracts were cleaned up with a column of silica gel.
Water-borne raspberry-like PMMA/SiO2 nanocom-posite particles were prepared via free radical copolymerization of methyl methacrylate (MMA) with 1-vinylimidazole (1-VID) in the presence of ultrafine aqueous silica sols.
The average particle sizes and the silica contents of the nanocomposite particles were in the ranges from 120-330 nm and 15%-20%, respectively.
At the phase angles between 0.5° and 3.0°, the polarization for quartz powder with 10-μm particles is almost constant.
To study the inhibitory effect of oxymatrine (OM) on quartz-induced secretion of TNF-α in the fibroblast proliferation, a given amount of quartz powder and OM of different concentrations were put into the media of pure culture containing macrophages.
For example, fast saponification reactions as well as long lasting adsorption reactions of NaOH on quartz powder were recorded.
A single crystal of plagioclase was surrounded by quartz powder and water.
An investment based on hard plaster loaded with fine-grained quartz powder and good chemical removability was investigated.