Creating Responsive Surfaces with Tailored Wettability Switching Kinetics and Reconstruction Reversibility
- 24 November 2005
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 127 (50), 17610-17611
- https://doi.org/10.1021/ja056926u
Abstract
We report on the formation of responsive surfaces with tailorable surface reconstruction kinetics and switching hysteresis by thiolene radical addition of mercaptoalkanols with variable lengths to poly(vinylmethylsiloxane) networks. Exposing these elastomer surfaces to water results in rearrangement of the hydrophilic alkanes at the surface. The rearrangement kinetics decreases with increasing number of the methylene spacers (n) in the mercaptoalkanol. The response kinetics is found to be very fast for n = 2 and 6. For instance, upon exposing to water, the water contact angle on 3-mercaptopropanol-based surfaces decreases by ≈35° at the rate of 2°/s. The high flexibility of the siloxane backbone endows these materials with switching longevity; the materials were able to switch their wettability over 10 cycles with minimum hysteresis. Increasing the number of methylene spacers to n = 11 decreases the surface reorganization dramatically. Formation of semicrystalline regions in such materials (detected via IR) is responsible for initial “sluggish” kinetics and eventual surface “freezing”.This publication has 12 references indexed in Scilit:
- Rapid formation of soft hydrophilic silicone elastomer surfacesPolymer, 2005
- Molecular design of functional polymer surfacesJournal of Polymer Science Part B: Polymer Physics, 2004
- Photoinduced Vectorial Charge Transfer across Walls of Hollow MicrocapsulesAngewandte Chemie, 2004
- Surface-Responsive MaterialsScience, 2002
- A Smart Adhesive Joint: Entropic Control of Adhesion at a Polymer/Metal InterfaceJournal of the American Chemical Society, 2002
- Biological surface scienceSurface Science, 2002
- Optically active dimethylsiloxane copolymers with nucleophilic chiral sulfur groups pendant to the polysiloxane chainJournal of Polymer Science Part A: Polymer Chemistry, 1997
- The existence of structure progressions and wetting transitions in intermediately disordered monolayer alkyl chain assembliesThe Journal of Chemical Physics, 1994
- Correlation between adhesion hysteresis and phase state of monolayer filmsThe Journal of Physical Chemistry, 1993
- Carbon-hydrogen stretching modes and the structure of n-alkyl chains. 1. Long, disordered chainsThe Journal of Physical Chemistry, 1982