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

Prime, Emma L., Solomon, David H., Dagley, Ian J. and Qiao, Greg G. 2016, Duolayers at the air/water interface: improved lifetime through ionic interactions, Journal of physical chemistry B, vol. 120, no. 30, pp. 7401-7407, doi: 10.1021/acs.jpcb.6b04273.

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Title Duolayers at the air/water interface: improved lifetime through ionic interactions
Author(s) Prime, Emma L.ORCID iD for Prime, Emma L. orcid.org/0000-0002-1410-6717
Solomon, David H.
Dagley, Ian J.
Qiao, Greg G.
Journal name Journal of physical chemistry B
Volume number 120
Issue number 30
Start page 7401
End page 7407
Total pages 7
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2016
ISSN 1520-6106
Summary 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.
Language eng
DOI 10.1021/acs.jpcb.6b04273
Field of Research 030603 Colloid and Surface Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085238

Document type: Journal Article
Collections: Institute for Frontier Materials
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