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Duolayers at the air/water interface: improved lifetime through ionic interactions

Version 2 2024-06-04, 07:38
Version 1 2016-08-04, 09:56
journal contribution
posted on 2024-06-04, 07:38 authored by EL Prime, DH Solomon, IJ Dagley, GG Qiao
Ionic interactions to stabilize Langmuir films at the air/water interface have been used to develop improved duolayer films. Two-component mixtures of octadecanoic (stearic) acid and poly(diallyldimethylammonium chloride) (polyDADMAC) with different ratios were prepared and applied to the water surface. Surface pressure isotherm cycles demonstrated a significant improvement in film stability with the inclusion of the polymer. Viscoelastic properties were measured using canal viscometry and oscillating barriers, with both methods showing that the optimum ratio for improved properties was four octadecanoic acid molecules to one DADMAC unit (1:0.25). At this ratio it is expected multiple strong ionic interactions are formed along each polymer chain. Brewster angle microscopy showed decreased domain size with increased ratios of polyDADMAC, indicating that the polymer is interspersed across the surface. This new method to stabilize and increase the viscoelastic properties of charged monolayer films, using a premixed composition, will have application in areas such as water evaporation mitigation, optical devices, and foaming.

History

Journal

Journal of physical chemistry B

Volume

120

Pagination

7401-7407

Location

Washington, D.C.

ISSN

1520-6106

eISSN

1520-5207

Language

eng

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2016, American Chemical Society

Issue

30

Publisher

American Chemical Society

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