Effect of the Skeletonization Process on Vapor Sorption into Langmuir−Blodgett Multilayers

One of simplest Langmuir−Blodgett films is a stack of fatty acid layers bridged together by divalent cations. A certain fraction of fatty acids remain protonated, an amount dictated by aqueous subphase conditions during film deposition; these films are thus comprised of two components with different...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2001-10, Vol.40 (20), p.4283-4287
Main Authors: Girard, Kevin P, Hanley, Conor M, Vanderlick, T. Kyle, Quinn, John A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Langmuir blodgett films
Surface physical chemistry
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Summary:One of simplest Langmuir−Blodgett films is a stack of fatty acid layers bridged together by divalent cations. A certain fraction of fatty acids remain protonated, an amount dictated by aqueous subphase conditions during film deposition; these films are thus comprised of two components with different solubilities in organic solvents. We investigated the so-called skeletonization process that occurs when behenic acid multilayers are immersed in benzene. In particular, we used a quartz crystal microbalance to measure the loss of film mass and found that it agrees well with the amount of protonated acid in the original film. We also used the quartz crystal microbalance to investigate the equilibrium vapor sorption properties of unmodified films and compared them to those of skeletonized films. Both types of films take in nearly the same amount of water but absorb distinctly different amounts of selected organic vapors.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie0011122