Self-assembled monolayers on mercury probed with a modified surface force apparatus

Clasohm, Lucy Y., Chen, Miao, Knoll, Wolfgang, Vinogradova, Olga I. and Horn, Roger G. 2006, Self-assembled monolayers on mercury probed with a modified surface force apparatus, Journal of physical chemistry b, vol. 110, no. 51, pp. 25931-25940, doi: 10.1021/jp062340y.

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Title Self-assembled monolayers on mercury probed with a modified surface force apparatus
Author(s) Clasohm, Lucy Y.
Chen, Miao
Knoll, Wolfgang
Vinogradova, Olga I.
Horn, Roger G.
Journal name Journal of physical chemistry b
Volume number 110
Issue number 51
Start page 25931
End page 25940
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2006
ISSN 1520-6106
Summary Self-assembled monolayers (SAMs) of three thiol compounds formed on mercury are investigated by a combination of cyclic voltammetry, electrocapillary curves, and a novel method of measuring electrical doublelayer properties. The last method involves a modified surface force apparatus in which a flat mica surface is pressed down toward a fixed mercury drop held beneath it, while both are immersed in aqueous electrolyte solution. Optical interference measurements are made of the mica-mercury separation as a function of electrical potential applied to the mercury, which yields information on the double-layer interaction between the two surfaces. Mercury is decorated by SAMs of 11-mercapto-1-undecanoic acid, which is shown to bring negative charge to the mercury/aqueous interface due to dissociation of the carboxylic acid groups; 11-mercapto-1- undecanol, which although it is uncharged changes the dipole potential of the interface; and 1-undecanethiol, which likewise changes the dipole potential, but by a different amount. The difference between the changes in dipole potential (90 mV) can be related to the different terminal groups of these two SAMs, -CH3 compared to -OH, that are in contact with the aqueous phase.
Notes First published online 30th November, 2006
Language eng
DOI 10.1021/jp062340y
Field of Research 030603 Colloid and Surface Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, American Chemical Society
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