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

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• 作者：Kevin P. Girard ; Conor M. Hanley ; T. Kyle Vanderlick ; and John A. Quinn
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2001
• 出版时间：October 3, 2001
• 年：2001
• 卷：40
• 期：20
• 页码：4283 - 4287
• 全文大小：59K
• 年卷期：v.40,no.20(October 3, 2001)
• ISSN：1520-5045

文摘

One of simplest Langmuir-Blodgett films is a stack of fatty acid layers bridged together bydivalent cations. A certain fraction of fatty acids remain protonated, an amount dictated byaqueous subphase conditions during film deposition; these films are thus comprised of twocomponents with different solubilities in organic solvents. We investigated the so-calledskeletonization process that occurs when behenic acid multilayers are immersed in benzene. Inparticular, we used a quartz crystal microbalance to measure the loss of film mass and foundthat it agrees well with the amount of protonated acid in the original film. We also used thequartz crystal microbalance to investigate the equilibrium vapor sorption properties of unmodifiedfilms and compared them to those of skeletonized films. Both types of films take in nearly thesame amount of water but absorb distinctly different amounts of selected organic vapors.