[1] Zhao Gutian, Guo Weichuan, Tan Qiyan, Qiu YinghuaKan Yajing, et al. Force measurement between mica surfaces in electrolyte solutions [J]. Journal of Southeast University (English Edition), 2013, 29 (1): 57-61. [doi:10.3969/j.issn.1003-7985.2013.01.012]

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Force measurement between mica surfaces in electrolyte solutions()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

29

Issue:

2013 1

Page:

57-61

Research Field:

Mathematics, Physics, Mechanics

Publishing date:

2013-03-20

Info

Title:

Force measurement between mica surfaces in electrolyte solutions

Author(s):

Zhao Gutian¹;  Guo Weichuan¹;  Tan Qiyan¹;  Qiu Yinghua¹Kan Yajing¹;  Chen Yunfei¹;  2;  Ni Zhonghua¹

¹Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
²Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 210096, China

Keywords:

surface force apparatus(SFA);  DLVO force;  hydration force;  screening effect

PACS:

O561.4

DOI:

10.3969/j.issn.1003-7985.2013.01.012

Abstract:

The forces between two molecularly smooth mica surfaces are measured in monovalent and divalent cations electrolyte solutions by a surface force apparatus(SFA). The properties of K⁺, Na⁺, and Mg²⁺ between molecularly smooth mica surfaces are investigated. The Derjagui-Landau-Verwey-Overbeek(DLVO)force and the hydration force are detected in the experiment. The results show that in lower concentrations of a monovalent electrolyte solution(about 10^-4 mol/L), the force curves are completely in good agreement with those computed by the DLVO theory. However, additional short-range repulsive forces which deviate from the DLVO theory are observed when the concentrations of cations are above the critical bulk concentration, which is different for each electrolyte. The results show the properties of these cations on both the screening effect adsorbed on the mica surface and the hydration in solution. From the results, the interaction energy between two hydrated ions of potassium or sodium can also be estimated.

References:

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Memo

Memo:

Biographies: Zhao Gutian(1979—), male, graduate; Ni Zhonghua(corresponding author), male, doctor, professor, nzh2003@seu.edu.cn.
Foundation items: The National Basic Research Program of China(973 Program)(No.2011CB707605), the National Natural Science Foundation of China(No.50925519, 50821063).
Citation: Zhao Gutian, Guo Weichuan, Tan Qiyan, et al. Force measurement between mica surfaces in electrolyte solutions[J].Journal of Southeast University(English Edition), 2013, 29(1):57-61.[doi:10.3969/j.issn.1003-7985.2013.01.012]

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