Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 449, Issue -, Pages 428-435Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.01.002
Keywords
Dewetting; DPPC; Silicone hydrogel (SiHy) lenses; Lipid deposition; Insoluble surfactant; Interfacial rheology
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Funding
- NIH [NS069375]
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We investigate the stabilizing effect of insoluble surfactant monolayers on thin aqueous films. We first describe an experimental platform that enables the formation of aqueous films laden with dipalmitoylphosphatidylcholine (DPPC) monolayers on curved silicone hydrogel (SiHy) substrates. We show that these surfactant layers extend the lifetime of the aqueous films. The films eventually dewet by the nucleation and growth of dry areas and the onset of this dewetting can be controlled by the surface rheology of the DPPC layer. We thus demonstrate that increasing the interfacial rheology of the DPPC layer leads to stable films that delay dewetting. We also show that dewetting can be exploited to controllably pattern the underlying curved SiHy substrates with DPPC layers. (C) 2015 Elsevier Inc. All rights reserved.
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