Transport and Ion Exchange in Langmuir-Blodgett Films: Water Transport and Film Microstructure by Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy

Tracy L. Marshbanks; Dong June Ahn; Elias I. Franses

doi:10.1021/la00013a041

Transport and Ion Exchange in Langmuir-Blodgett Films: Water Transport and Film Microstructure by Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy

Tracy L. Marshbanks, Dong June Ahn, Elias I. Franses

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Langmuir-Blodgett (LB) films of calcium stearate were studied by FTIR before, during, and after contact with water and aqueous solutions of hydrochloric acid. The films retain from 1.5 to 3 wt % water of hydration, and they absorb at least 8 wt % (possibly up to 16 wt %) water, probably in voids, when contacted with bulk liquid water. The effective diffusivity of water in the films was estimated from the data to be in the range from about 10^-13 to 10^-10 cm².s^-1, but water transport was probably neither purely diffusive nor one-dimensional. The effects of ion exchange and thermal annealing at 100-140 °C on the film microstructure was monitored by detailed analysis of polarized ATR spectra. Conversion of calcium stearate to stearic acid caused film dehydration, recrystallization, and an increase in trans conformations. Certain implications on the barrier, transport, and ion exchange properties of LB films are discussed.

Original language	English
Pages (from-to)	276-285
Number of pages	10
Journal	Langmuir
Volume	10
Issue number	1
DOIs	https://doi.org/10.1021/la00013a041
Publication status	Published - 1994 Jan 1
Externally published	Yes

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la00013a041

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title = "Transport and Ion Exchange in Langmuir-Blodgett Films: Water Transport and Film Microstructure by Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy",

abstract = "Langmuir-Blodgett (LB) films of calcium stearate were studied by FTIR before, during, and after contact with water and aqueous solutions of hydrochloric acid. The films retain from 1.5 to 3 wt % water of hydration, and they absorb at least 8 wt % (possibly up to 16 wt %) water, probably in voids, when contacted with bulk liquid water. The effective diffusivity of water in the films was estimated from the data to be in the range from about 10-13 to 10-10 cm2.s-1, but water transport was probably neither purely diffusive nor one-dimensional. The effects of ion exchange and thermal annealing at 100-140 °C on the film microstructure was monitored by detailed analysis of polarized ATR spectra. Conversion of calcium stearate to stearic acid caused film dehydration, recrystallization, and an increase in trans conformations. Certain implications on the barrier, transport, and ion exchange properties of LB films are discussed.",

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AU - Ahn, Dong June

AU - Franses, Elias I.

PY - 1994/1/1

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N2 - Langmuir-Blodgett (LB) films of calcium stearate were studied by FTIR before, during, and after contact with water and aqueous solutions of hydrochloric acid. The films retain from 1.5 to 3 wt % water of hydration, and they absorb at least 8 wt % (possibly up to 16 wt %) water, probably in voids, when contacted with bulk liquid water. The effective diffusivity of water in the films was estimated from the data to be in the range from about 10-13 to 10-10 cm2.s-1, but water transport was probably neither purely diffusive nor one-dimensional. The effects of ion exchange and thermal annealing at 100-140 °C on the film microstructure was monitored by detailed analysis of polarized ATR spectra. Conversion of calcium stearate to stearic acid caused film dehydration, recrystallization, and an increase in trans conformations. Certain implications on the barrier, transport, and ion exchange properties of LB films are discussed.

AB - Langmuir-Blodgett (LB) films of calcium stearate were studied by FTIR before, during, and after contact with water and aqueous solutions of hydrochloric acid. The films retain from 1.5 to 3 wt % water of hydration, and they absorb at least 8 wt % (possibly up to 16 wt %) water, probably in voids, when contacted with bulk liquid water. The effective diffusivity of water in the films was estimated from the data to be in the range from about 10-13 to 10-10 cm2.s-1, but water transport was probably neither purely diffusive nor one-dimensional. The effects of ion exchange and thermal annealing at 100-140 °C on the film microstructure was monitored by detailed analysis of polarized ATR spectra. Conversion of calcium stearate to stearic acid caused film dehydration, recrystallization, and an increase in trans conformations. Certain implications on the barrier, transport, and ion exchange properties of LB films are discussed.

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Transport and Ion Exchange in Langmuir-Blodgett Films: Water Transport and Film Microstructure by Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy

Abstract

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