Measurement of surface forces between mica sheets immersed in aqueous quaternary ammonium ion solutions

Claesson, P., Horn, R. G. and Pashley, R. M. 1984, Measurement of surface forces between mica sheets immersed in aqueous quaternary ammonium ion solutions, Journal of colloid and interface science, vol. 100, no. 1, pp. 250-263, doi: 10.1016/0021-9797(84)90433-8.

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Title Measurement of surface forces between mica sheets immersed in aqueous quaternary ammonium ion solutions
Author(s) Claesson, P.
Horn, R. G.
Pashley, R. M.
Journal name Journal of colloid and interface science
Volume number 100
Issue number 1
Start page 250
End page 263
Total pages 14
Publisher Academic Press
Place of publication Maryland Heights, Mo.
Publication date 1984-07
ISSN 0021-9797
Keyword(s) ions - adsorption
ammonium ion solutions
surface forces
Summary Forces between mica surfaces immersed in Me4NBr, Pr4NBr, and Pe4NBr solutions over a wide concentration range are reported (Me = methyl, Pr = propyl, Pe = pentyl). In each case the cation adsorbs quite strongly onto the negatively charged mica surface and determines the double-layer potential. However, this strong adsorption does not cause complete neutralization of the negative lattice charge apparently because of packing constraints due to the large size of these ions. Adsorption of Me4N+ ions gives rise to a short-range (<2 nm) repulsive force similar to that previously observed between bilayers of CTAB and may be due to the residual hydration of these ions. The large rations also, unexpectedly, give rise to short-range repulsive forces but of a somewhat different nature. In this case, the repulsive forces can be explained by assuming that the large adsorbed ions shift the plane of charge a distance of one ion diameter from the mica surface. At all but very high concentrations these larger ions could be displaced from the mica surfaces on forcing them together. No evidence of any “hydrophobic attraction” was observed between surfaces containing these adsorbed ions. Previous studies on coagulation are discussed in the light of our results.
Language eng
DOI 10.1016/0021-9797(84)90433-8
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 ©1984, Academic Press
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