受限混合物溶剂中胶粒的耗尽势及吸附稳定性

doi:10.7503/cjcu20170331

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (12): 2262.doi: 10.7503/cjcu20170331

受限混合物溶剂中胶粒的耗尽势及吸附稳定性

康艳霜¹(), 孙宗利²(), 檀姗姗²

1. 河北农业大学理学院, 保定 071001
2. 华北电力大学科技学院, 保定 071051

收稿日期:2017-05-26 出版日期:2017-12-10 发布日期:2017-11-21
作者简介:联系人简介: 康艳霜, 女, 讲师, 主要从事经典流体的统计理论研究. E-mail: kang_yanshuang@163.com。孙宗利, 男, 博士, 副教授, 主要从事经典和量子流体的统计理论研究. E-mail: sunzl@ncepu.edu.cn
基金资助:
国家自然科学基金(批准号: 21503077)、中央高校基本科研业务费(批准号: 2016MS156)、河北省科技计划项目(批准号: 13213704)和河北农业大学青年教师境外研修项目资助

Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture^†

KANG Yanshuang^1,^*(), SUN Zongli^2,^*(), TAN Shanshan²

1. College of Science, Hebei Agricultural University, Baoding 071001, China
2. Science and Technology College, North China Electric Power University, Baoding 071051, China

Received:2017-05-26 Online:2017-12-10 Published:2017-11-21
Contact: KANG Yanshuang,SUN Zongli E-mail:kang_yanshuang@163.com;sunzl@ncepu.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21503077), the Fundamental Research Fund for the Central Universities of China(No.2016MS156), and the Technology Research and Development Program of Hebei Province, China(No.13213704) and the Program of Study Abroad for Young Teachers by Agricultural University of Hebei, China

摘要/Abstract

摘要：

基于密度泛函理论和Yvon-Born-Green方程得到了胶粒耗尽势的表达式. 采用密度泛函理论计算了单壁附近和平行狭缝中的混合物溶剂中胶粒的耗尽势及其在单壁处的吸附稳定性. 研究结果表明, 不同溶剂组分的体积分数和粒子尺寸比等因素对胶粒耗尽势的强度、力程和周期均可产生显著影响, 胶粒在单壁附近的吸附稳定性与溶剂粒子尺寸比和体积分数密切相关. 此外, 对受限于平行狭缝的胶体悬浮液, 胶粒的耗尽势阱还可随粒子尺寸比和缝宽呈振荡趋势变化.

关键词: 混合物, 耗尽势, 密度泛函理论, 吸附稳定性, 耗尽势阱

Abstract:

Based on density functional theory and Yvon-Born-Green equation, the expression for depletion potential was derived. The depletion potential and adsorption stability were calculated and investigated via density functional theory for the colloidal particles immersed in the solvent mixture, which was confined by a single wall and in slit pore. The results showed that the volume fraction and the size ratio of the solvents influence significantly the depletion potential in its strength, range and oscillation period. Moreover, the adsorption stability of the colloidal particle at the wall related closely to the volume fraction and size ratio of the solvents. In addition, for the colloidal suspension confined in slit pore, the depletion potential-well of a colloidal particle might show oscillation as the size ratio and the pore width were modulated.

Key words: Mixture, Depletion potential, Density functional theory, Adsorption stability, Depletion potential-well

中图分类号:

O641

TrendMD:

康艳霜, 孙宗利, 檀姗姗. 受限混合物溶剂中胶粒的耗尽势及吸附稳定性. 高等学校化学学报, 2017, 38(12): 2262.

KANG Yanshuang, SUN Zongli, TAN Shanshan. Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture^†. Chem. J. Chinese Universities, 2017, 38(12): 2262.

图/表 6

Fig.1 Comparison of calculated results with those from the Monte-Carlo simulation The lines correspond the results from this work, while the symbols to those from Monte-Carlo simulation.

Fig.2 Depletion potential and its contributions between colloidal particle and the wall under different conditions of relative volume fraction xs(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.3 Depletion potential and its contributions between colloidal particle and the wall under different conditions of size ratio Rms(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.4 Depletion potential and its contributions between colloidal particle and the slit pore under different conditions of pore width H(A) The results for the total depletion potential W(z); (B)—(D) the contributions Ws(z), Wm(z) and Wint(z), respectively.

Fig.5 Near the single wall, the variation of depletion well ΔW with Rms(A) and ηtot(B)

Fig.6 In the slit, the variation of depletion well ΔW with Rbs(A) and H/σs(B)

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受限混合物溶剂中胶粒的耗尽势及吸附稳定性

Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture^†

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受限混合物溶剂中胶粒的耗尽势及吸附稳定性

Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture†

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摘要/Abstract

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Depletion Potential and Adsorption Stability of a Colloidal Particle in Confined Solvent Mixture^†