| INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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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 |
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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.
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Received: 15 October 2014
Revised: 14 December 2014
Accepted manuscript online:
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PACS:
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82.65.+r
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(Surface and interface chemistry; heterogeneous catalysis at surfaces)
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82.33.Pt
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(Solid state chemistry)
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82.60.Qr
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(Thermodynamics of nanoparticles)
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05.70.Np
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(Interface and surface thermodynamics)
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| Fund: 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). |
Corresponding Authors:
Yang Gang, Li Hang
E-mail: theobiochem@gmail.com;lihangswu@163.com
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| About author: 82.65.+r; 82.33.Pt; 82.60.Qr; 05.70.Np |
Cite this article:
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 2015 Chin. Phys. B 24 068202
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