Journal article
Barrier membranes with different sizes of aligned flakes
Journal of membrane science, Vol.254(1), pp.21-30
2005
DOI: 10.1016/j.memsci.2004.12.025
Abstract
The permeability of polymer films can be reduced dramatically with many layers of thin mineral flakes aligned parallel to the film's surface. For a film with a volume fraction
ϕ of flakes of aspect ratio
α, the permeability reduction is expected to be proportional to
αϕ for the dilute limit (
ϕ
≪
1 and
αϕ
<
1) but proportional to (
αϕ)
2 in the semi-dilute limit (
ϕ
≪
1 but
αϕ
>
1). Permeabilities of hydrochloric acid and sodium hydroxide across films containing mica or vermiculite in polyvinyl alcohol agree with the second, semi-dilute prediction. Permeabilities of helium across films of montmorillonite in polyethylene glycol do as well. These improvements in barrier properties are independent of flake size, permeant and polymer chemistry.
Details
- Title: Subtitle
- Barrier membranes with different sizes of aligned flakes
- Creators
- Jonathan P DeRocherBrian T GettelfingerJunshan WangEric E NuxollE.L Cussler
- Resource Type
- Journal article
- Publication Details
- Journal of membrane science, Vol.254(1), pp.21-30
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.memsci.2004.12.025
- ISSN
- 0376-7388
- eISSN
- 1873-3123
- Language
- English
- Date published
- 2005
- Academic Unit
- Chemical and Biochemical Engineering; Pharmaceutical Sciences and Experimental Therapeutics
- Record Identifier
- 9984003988202771
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