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Transport properties of water and pentane in Langmuir–Blodgett films
Author(s) -
Hanley C. M.,
Quinn J. A.,
Vanderlick T. K.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420506
Subject(s) - pentane , quartz crystal microbalance , chemistry , langmuir , water vapor , vapor pressure , arachidic acid , analytical chemistry (journal) , thermal diffusivity , solubility , langmuir–blodgett film , annealing (glass) , adsorption , langmuir adsorption model , diffusion , vapour pressure of water , materials science , thermodynamics , chromatography , organic chemistry , composite material , molecule , physics
The transport of water and pentane vapor in Langmuir–Blodgett (LB) films of arachidic acid is investigated. A quartz crystal microbalance is used to monitor the mass increases of the films upon exposure to the vapor as a function of the pressure. By examining films of different thicknesses, it is shown that it is possible to measure both surface adsorption and solubility. Diffusivity is calculated from the rate of uptake. Water and pentane have Fickian diffusion coefficients of 4 × 10 −12 cm 2 ·s −1 and 1 × 10 −12 cm 2 ·s −1 , respectively. The effect of both aging and annealing of the LB films on the vapor uptake is studied and it is shown that the uptake is sensitive to the state of the film.