A theoretical exploration of the influencing factors for surface potential

doi:10.1088/1674-1056/24/6/068202

中国物理B ›› 2015, Vol. 24 ›› Issue (6): 68202-068202.doi: 10.1088/1674-1056/24/6/068202

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

A theoretical exploration of the influencing factors for surface potential

刘新敏^{a b}, 杨刚^a, 李航^a, 田锐^a, 李睿^a, 丁武泉^a, 袁若^b

a Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400715, China;
b School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China

收稿日期:2014-10-15 修回日期:2014-12-14 出版日期:2015-06-05 发布日期:2015-06-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 41371249, 41201223, and 41101223) and the Fundamental Research Funds for the Central Universities, China (Grant No. XDJK2015C059).

A theoretical exploration of the influencing factors for surface potential

Liu Xin-Min (刘新敏)^{a b}, Yang Gang (杨刚)^a, Li Hang (李航)^a, Tian Rui (田锐)^a, Li Rui (李睿)^a, Ding Wu-Quan (丁武泉)^a, Yuan Ruo (袁若)^b

a Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, College of Resources and Environment, Southwest University, Chongqing 400715, China;
b School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China

Received:2014-10-15 Revised:2014-12-14 Online:2015-06-05 Published:2015-06-05
Contact: Yang Gang, Li Hang E-mail:theobiochem@gmail.com;lihangswu@163.com
About author:82.65.+r; 82.33.Pt; 82.60.Qr; 05.70.Np
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 41371249, 41201223, and 41101223) and the Fundamental Research Funds for the Central Universities, China (Grant No. XDJK2015C059).

摘要/Abstract

摘要： Although it has been widely used to probe the interfacial property, dynamics, and reactivity, the surface potential remains intractable for directly being measured, especially for charged particles in aqueous solutions. This paper presents that the surface potential is strongly dependent on the Hofmeister effect, and the theory including ion polarization and ionic correlation shows significant improvement compared with the classical theory. Ion polarization causes a strong Hofmeister effect and further dramatic decrease to surface potential, especially at low concentration; in contrast, ionic correlation that is closely associated with potential decay distance overestimates surface potential and plays an increasing role at higher ionic concentrations. Contributions of ion polarization and ionic correlation are respectively assessed, and a critical point is detected where their contributions can be exactly counteracted. Ionic correlation can be almost neglected at low ionic concentrations, while ion polarization, albeit less important at high concentrations, should be considered across the entire concentration range. The results thus obtained are applicable to other interfacial processes.

关键词: Hofmeister effect, ionic activity, interfacial process, potential distribution

Abstract: Although it has been widely used to probe the interfacial property, dynamics, and reactivity, the surface potential remains intractable for directly being measured, especially for charged particles in aqueous solutions. This paper presents that the surface potential is strongly dependent on the Hofmeister effect, and the theory including ion polarization and ionic correlation shows significant improvement compared with the classical theory. Ion polarization causes a strong Hofmeister effect and further dramatic decrease to surface potential, especially at low concentration; in contrast, ionic correlation that is closely associated with potential decay distance overestimates surface potential and plays an increasing role at higher ionic concentrations. Contributions of ion polarization and ionic correlation are respectively assessed, and a critical point is detected where their contributions can be exactly counteracted. Ionic correlation can be almost neglected at low ionic concentrations, while ion polarization, albeit less important at high concentrations, should be considered across the entire concentration range. The results thus obtained are applicable to other interfacial processes.

Key words: Hofmeister effect, ionic activity, interfacial process, potential distribution

中图分类号: (Surface and interface chemistry; heterogeneous catalysis at surfaces)

82.65.+r

82.33.Pt (Solid state chemistry) 82.60.Qr (Thermodynamics of nanoparticles) 05.70.Np (Interface and surface thermodynamics)

刘新敏, 杨刚, 李航, 田锐, 李睿, 丁武泉, 袁若. A theoretical exploration of the influencing factors for surface potential[J]. 中国物理B, 2015, 24(6): 68202-068202.

Liu Xin-Min (刘新敏), Yang Gang (杨刚), Li Hang (李航), Tian Rui (田锐), Li Rui (李睿), Ding Wu-Quan (丁武泉), Yuan Ruo (袁若). A theoretical exploration of the influencing factors for surface potential[J]. Chin. Phys. B, 2015, 24(6): 68202-068202.

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A theoretical exploration of the influencing factors for surface potential

A theoretical exploration of the influencing factors for surface potential

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