Colloidal stability and the influence of the dissolved gas

Article Abstract:

The colloidal stability of synthetic silica spheres with clean, methylated, and dehydroxylated surfaces is studied at different concentrations of dissolved gas and KCl electrolyte at a fixed pH of 4.2. A classic stability ratio/electrolyte concentration analysis shows that hydrophobic, methylated particles undergo faster rates of aggregation with increasing concentrations of dissolved carbon dioxide.

Industrial Gas Manufacturing, Industrial gases, Carbon Dioxide, Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silica, Silicon dioxide

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Formation, absorption spectrum, and chemical reactions of nanosized colloidal cobalt in aqueous solution

Article Abstract:

The preparation of cobalt nanoparticles using the chemical reduction of Co(super 2+) ions by NaBH (sub 4) in inverse micelles is reported and optical measurement was carried out at wavelengths above 250nm. The results obtained show that under gamma-irradiation the reduction of cobalt ions in aqueous solutions containing formate occurs in an autocatalytic regime.

Cobalt Compounds, Chemical reactions

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Photoenhancement of luminescence in colloidal CdSe quantum dot solutions

Article Abstract:

Photoenhancement effect in colloidal CdSe and (CdSe)ZnS core-shell quantum dots attached to a variety of surfactant molecules in aqueous and nonaqueous environment is observed. Results show that the effect occurs in dots suspended in a variety of organic or aqueous situations.

Selenium Compounds, Luminescence

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