Transport and ion exchange in Langmuir-Blodgett films. Water transport and film microstructure by attenuated total reflectance Fourier transform infrared spectroscopy

T. L. Marshbanks, Dong June Ahn, E. I. Franses

Research output: Contribution to journalArticle

25 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 languageEnglish
Pages (from-to)276-285
Number of pages10
JournalLangmuir
Volume10
Issue number1
Publication statusPublished - 1994 Jan 1
Externally publishedYes

Fingerprint

Langmuir Blodgett films
Ion Exchange
Fourier Transform Infrared Spectroscopy
Langmuir-Blodgett films
Fourier transform infrared spectroscopy
Ion exchange
infrared spectroscopy
reflectance
microstructure
Microstructure
Water
Calcium stearate
water
stearates
ions
calcium
Stearic acid
Hydrochloric Acid
hydrochloric acid
Hydrochloric acid

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Transport and ion exchange in Langmuir-Blodgett films. Water transport and film microstructure by attenuated total reflectance Fourier transform infrared spectroscopy. / Marshbanks, T. L.; Ahn, Dong June; Franses, E. I.

In: Langmuir, Vol. 10, No. 1, 01.01.1994, p. 276-285.

Research output: Contribution to journalArticle

@article{1fa7e098ea1447aab2d19c58e905f6b8,
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.",
author = "Marshbanks, {T. L.} and Ahn, {Dong June} and Franses, {E. I.}",
year = "1994",
month = "1",
day = "1",
language = "English",
volume = "10",
pages = "276--285",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "1",

}

TY - JOUR

T1 - Transport and ion exchange in Langmuir-Blodgett films. Water transport and film microstructure by attenuated total reflectance Fourier transform infrared spectroscopy

AU - Marshbanks, T. L.

AU - Ahn, Dong June

AU - Franses, E. I.

PY - 1994/1/1

Y1 - 1994/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=0028338040&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028338040&partnerID=8YFLogxK

M3 - Article

VL - 10

SP - 276

EP - 285

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 1

ER -