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Forces between two glass surfaces with adsorbed hexadecyltrimethylammonium salicylate
YKI – Ytkemiska institutet.
2000 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 16, 1937-1942 p.Article in journal (Refereed)
Abstract [en]

Forces have been measured for hexadecyltrimethylammonium salicylate (C16TASal) layers on glass beads. During the inward process, hydrophobic attraction occurred at lower adsorption of C16TASal and electrostatic repulsion interactions happened at higher adsorption. While the jump-in phenomenon was observed for solutions of concentrations below the critical micelle concentration (cmc = 0.15 mM), the step-in phenomenon was characteristic for solutions at the cmc and above the cmc, suggesting the push-out of adsorbed C16TASal layers and/or inserted micelles. The remarkable pull-off phenomenon on the outward process occurred for all solutions, indicating a strong interaction between C16TASal molecules. For aqueous 0.15 mM C16TASal solutions of various NaSal concentrations, on the inward process, the electrostatic repulsive interaction decreased with adding NaSal. This is due to the electrostatic shielding by salt excess. The height of the force wall on the inward process reached a maximum at 0.01 M NaSal, but the interlocking between molecules on two surfaces during the outward process was minimized at 0.1 M NaSal. These tendencies, which are different from that of the electrostatic repulsion interaction, imply the strong cohesion between adsorbed C16TASal layers.

Place, publisher, year, edition, pages
2000. Vol. 16, 1937-1942 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27224OAI: oai:DiVA.org:ri-27224DiVA: diva2:1054228
Note
A1337Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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