UNSPECIFIED (2000) Lateral proton diffusion rates along stearic acid monolayers. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 122 (11). pp. 2597-2602. ISSN 0002-7863

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Abstract

Proton in-plane lateral diffusion rates in Langmuir monolayers have been measured as a function of surface coverage, with a sensitivity not possible previously, using scanning electrochemical microscopy (SECM) operating in the induced desorption mode. With this approach an acidic monolayer, spread at the air/water interface, is deprotonated locally, by reducing protons in solution to hydrogen at an ultramicroelectrode probe, which drives the acid dissociation reaction. In turn, this creates a proton diffusion gradient in the solution and at the interface, and the transport-limited current flowing at the electrode provides a measure of the rates of diffusion in these two environments. Measurements on stearic acid monolayers at the air/water interface clearly show that in-plane lateral proton diffusion occurs, but the diffusion coefficient depends critically on the physical state of the monolayer, and is at most only ca. 15% of the magnitude in bulk solution.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Publisher:	AMER CHEMICAL SOC
ISSN:	0002-7863
Date:	22 March 2000
Volume:	122
Number:	11
Number of Pages:	6
Page Range:	pp. 2597-2602
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/13541

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