Liesegang patterns: Estimation of diffusion coefficient and a plausible justification for colloid explanation
Liesegang patterns: Estimation of diffusion coefficient and a plausible justification for colloid explanation
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DOI：
10.1007/s00396-002-0738-4
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发表时间：
2002-12-01
影响因子：
2.4
通讯作者：
Varghese, G
中科院分区：
文献类型：
--
作者：
George, J;Varghese, G
Liesegang 现象被解释为移动边界问题。现有的时间定律、间隔定律和宽度定律在新场景的基础上被重新审视和重新表述。新概念可以更好地理解与模式形成相关的基本事实。该现象是根据胶体动力学来解释的。计算了文献中各种实验的凝胶中外部电解质的扩散系数。计算出的扩散系数范围为1.792-5.996 x 10(-10) m(2) s(-1)。这表明这些值证实了周期性降水模式形成过程中的快速胶体动力学。
The Liesegang phenomenon is interpreted as a moving boundary problem. The existing time law, spacing law, and width law are revisited and reformulated on the basis of the new scenario. A better understanding of the basic facts associated with pattern formation is made possible with the new concept. The phenomenon is explained on the basis of colloidal kinetics. Diffusion coefficients of the outer electrolyte in the gel for various experiments in the literature are calculated. The diffusion coefficients so calculated range from 1.792-5.996 x 10(-10) m(2) s(-1). It is suggested that such values confirm the fast colloidal dynamics during the process of periodic precipitation pattern formation.