NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Confinement Effects on Mositure Absorption Kinetics in Polyelectrolyte Films
Published
Author(s)
B D. Vogt, Christopher L. Soles, Hae-Jeong Lee, Eric K. Lin, Wen-Li Wu
Abstract
Quartz crystal microbalance (QCM) measurements were used to determine the absorption of water into thin poly(4-ammonium styrenesulfonic acid) films from saturated vapor at 25 C. The effect of film thickness on the absorption kinetics was investigated in the range of thickness from 3 to 150 nm. The absorption follows Fickian behavior for films greater than 50 nm thick. For thinner films, a two-stage absorption model can fit the data. The deviation from Fickian behavior increases with increasing confinement. In addition to the change in absorption behavior, there is also significant decreases in the water diffusivity as the film thickness is decreased below 50 nm, with the water diffusivity into a 3 nm film more than three orders of magnitude less than the bulk.
Citation
Abstracts Of Papers Of The American Chemical Society
Volume
226
Pub Type
Journals
Keywords
absorption, thin film
Citation
Vogt, B.
, Soles, C.
, Lee, H.
, Lin, E.
and Wu, W.
(2003),
Confinement Effects on Mositure Absorption Kinetics in Polyelectrolyte Films, Abstracts Of Papers Of The American Chemical Society
(Accessed October 12, 2025)