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Lateral proton diffusion rates along stearic acid monolayers
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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 | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | ||||
Publisher: | AMER CHEMICAL SOC | ||||
ISSN: | 0002-7863 | ||||
Official Date: | 22 March 2000 | ||||
Dates: |
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Volume: | 122 | ||||
Number: | 11 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 2597-2602 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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