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Direct measurement of surface forces due to charging of solids immersed in a nonpolar liquid

Briscoe, Wuge H. and Horn, Roger G. 2002, Direct measurement of surface forces due to charging of solids immersed in a nonpolar liquid, Langmuir, vol. 18, no. 10, pp. 3945-3956, doi: 10.1021/la015657s.

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Title Direct measurement of surface forces due to charging of solids immersed in a nonpolar liquid
Author(s) Briscoe, Wuge H.
Horn, Roger G.
Journal name Langmuir
Volume number 18
Issue number 10
Start page 3945
End page 3956
Total pages 12
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2002-05
ISSN 0743-7463
1520-5827
Keyword(s) Colloids
Negative ions
Paraffins
Solvents
Surface active agents
Summary Direct measurements of a long-range force between charged solid surfaces in a nonpolar liquid are presented for the first time. Measurements were made between mica surfaces in solutions of the anionic surfactant sodium di-2-ethylhexylsulfosuccinate (AOT) at millimolar concentrations in n-decane using a surface force apparatus which has been modified to improve its sensitivity for detecting a weak and long-range force. Modifications include a magnetic drive system, the use of a weak cantilever spring with the apparatus mounted in a vertical configuration, and a detailed consideration of the interference optics to allow accurate measurements of surface separations up to several micrometers. The results show a repulsion that is well fitted by theoretical curves based on a model in which only counterions enter the calculation, in other words, in the absence of a reservoir of ions in the solvent. Fitting the theory to the data allows an estimate of the mica surface charge density of ∼1 mC/m2. A mechanism for surface charging of mica in this solution is proposed, which includes a role for trace amounts of water that are inevitably present and adsorbed surface aggregates of AOT. The relevance of the results to previously observed charge stabilization of colloids in nonaqueous solvents is discussed.
Language eng
DOI 10.1021/la015657s
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2002, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041424

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