Structuring in liquid alkanes between solid surfaces : force measurements and mean-field theory
Christenson, H. K., Gruen, D. W. R., Horn, R. G. and Israelachvili, J. N. 1987, Structuring in liquid alkanes between solid surfaces : force measurements and mean-field theory, Journal of chemical physics, vol. 87, no. 3, pp. 1834-1841.
Measurements have been made of the solvation forces between mica surfaces in the even-numbered n-alkanes from hexane to hexadecane. In all cases the force law is qualitatively very similar, characterized by a decaying oscillatory function of distance, as occurs for simple isotropic liquids. The spacing between successive minima in the force does not increase with carbon number, and is comparable to the width of a linear alkane molecule rather than its length or any average diameter. This suggests that the alkanes have some tendency towards a parallel orientation near the mica surfaces. The measurements give no indication of any strong repulsive component expected from mean-field theories of higher alkanes or polymers. The results of one such theory are presented, and the reasons for its failure to match the experimental data are discussed.
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eng
Field of Research
029999 Physical Sciences not elsewhere classified
Socio Economic Objective
970102 Expanding Knowledge in the Physical Sciences
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