科研之友
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摘要
The effect of various dispersion stabilization parameters on particle size, stability, and self-cleaning activity of titania aqueous dispersion was investigated with a focus on stability during preparation, storage, and introduction of fabric in the dispersion. Effect of parameters such as sonication, high-speed mixing, pH, and addition of ionic and nonionic dispersants was studied. The degree of surface charge on titania influences its stability and depends on the type of pH and dispersant. The stability of titania dispersion with the immersion of cotton, was also found to be a strong function of pH, dispersants and their combination. With the immersion of cotton in the dispersion potential was %26gt;40mV in the pH range of 13, and then gradually becomes close to zero in the pH range 47, then decreased further with the increase in pH. In the study of combined effect of pH and dispersants, influence of pH on potential was independent in case of ionic dispersants and addition of nonionic dispersant has significant pH dependence. Self-cleaning activity (SCA) of titania-treated cotton fabric was quantitatively assessed by a standard method known as stain degradation assessment (SDA) method. SCA was highest at pH 2 followed by that at pH 10 and 12. In the presence of cationic dispersant, CTAB, potential was %26gt;50mV before and after cotton immersion and high SCA was obtained, however, in the presence of sodium salt of PAA, stable dispersion was obtained, but SCA reduced. %26lt;graphic xmlns:xlink=%26quot;http://www.w3.org/1999/xlink%26quot; xlink:href=%26quot;ldis_a_685842_o_uf0001.gif%26quot;%26gt;%26lt;/graphic
- 出版日期2013-5-1
