Quantitative Study on Thiophenol Modification and Redispersion Property of Cadmium Sulfide Ultrafine Particles Prepared in Reverse Micellar Systems
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The effects of feed S/Cd ratio and feed thiophenol (PhSH) concentration on a PhSH modification reaction and the redispersion property of CdS ultrafine particles prepared <I>in situ</I> in reverse micellar systems are investigated on the basis of the stoichiometric balance of the reactants. The concentration of PhSH connected with the surface of CdS ultrafine particles (<I>C</I><SUB>SHcon</SUB>) is estimated as a function of the feed S/Cd ratio, <I>y</I>. The experimental relationship between particle redispersion ratio <I>R</I> and <I>y</I> can be explained by assuming that <I>R</I> is a function of <I>C</I><SUB>SHcon</SUB>. The effect of decrease in the feed PhSH concentration on <I>R</I> is investigated using the calculated values of <I>C</I><SUB>SHcon</SUB>. The calculated <I>R</I> profile agrees very well with the previous experimental data taken without adding pyridine. Pyridine addition is likely to be effective for increasing the value of <I>R</I> by preventing the irreversible coagulation of CdS particles.
- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 31(1), 142-146, 1998-02
The Society of Chemical Engineers, Japan