SIMULTANEOUS ADSORPTION OF POLY(VINYLPYRROLIDONE) AND CATIONIC SURFACTANT FROM THEIR MIXED-SOLUTIONS ON SILICA
SIMULTANEOUS ADSORPTION OF POLY(VINYLPYRROLIDONE) AND CATIONIC SURFACTANT FROM THEIR MIXED-SOLUTIONS ON SILICA
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DOI：
10.1021/la00032a021
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发表时间：
1993-08-01
期刊：
影响因子：
3.9
通讯作者：
OYAMA, M
中科院分区：
文献类型：
--
作者：
ESUMI, K;OYAMA, M
研究了聚（乙烯基吡咯烷酮）（PVP）和十二烷基三甲基氯化铵（DTAC）在二氧化硅上的吸附随 DTAC 浓度的变化。随着DTAC浓度的增加，PVP的吸附量逐渐减小，而DTAC的吸附量则增加，但吸附量增加的幅度小于没有PVP时的吸附量。二氧化硅分散体的胶体稳定性在低 PVP 浓度下较差，但在较高 PVP 浓度下增强。电子自旋共振测量表明，在低浓度的 PVP 下，吸附的 PVP 构象相对平坦，而在较高浓度下，构象变得更加伸展。因此，二氧化硅分散体的稳定性与吸附的 PVP 构象的变化密切相关。
The adsorption of poly(vinylpyrrolidone) (PVP) and dodecyltrimethylammonium chloride (DTAC) on silica has been investigated as a function of DTAC concentration. The adsorption of PVP decreases gradually with increasing DTAC concentration, whereas the adsorption of DTAC increases, but the magnitude of the increase in the adsorption is smaller than that in the absence of PVP. The colloid stability of the silica dispersion is poor at low concentrations of PVP, but is enhanced at higher concentrations of PVP. Electron spin resonance measurements indicate that the conformation of adsorbed PVP is relatively flat at low concentrations of PVP, while the conformation becomes more extended at higher concentrations. The stability of the silica dispersion is thus well correlated with the change in the conformation of PVP adsorbed.