https://scholars.lib.ntu.edu.tw/handle/123456789/409371
標題: | Deposition of charge-regulated biocolloids on a charged surface | 作者: | Kuo Y.-C. Hsieh M.-Y. Hsu J.-P. |
公開日期: | 2002 | 卷: | 106 | 期: | 16 | 起(迄)頁: | 4255-4260 | 來源出版物: | Journal of Physical Chemistry B | 摘要: | A theoretical investigation on the rate of deposition of biocolloids onto a rigid, charged surface is presented. Here, a biocolloid is modeled by a hard core covered by an ion-penetrable charge membrane, which contains dissociable functional groups. We show that, for a constant amount of fixed groups, the thicker the membrane the faster the rate of deposition grows. Also, a lower concentration of fixed groups, lower surface potential of the rigid surface, smaller equilibrium constant for the dissociation of functional groups K a, and lower bulk pH all lead to a faster rate of deposition. The rate of deposition for various valence of cations follows the order (3:1) > (1:1) > (2:1). The variation of the characteristic time of the deposition process (time required to reach roughly the saturation of surface coverage), t c, as a function of the pK a (from 4 to 6) reveals that the behavior of the rate of deposition is influenced significantly by pH ranged from 4 to 7. As pH increases, t c approaches a constant value for the values of pK a examined. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409371 | ISSN: | 10895647 | DOI: | 10.1021/jp0144247 |
顯示於: | 化學工程學系 |
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