Sharp Hydrophilicity Switching and Conformality on Nanostructured Surfaces Prepared via Initiated Chemical Vapor Deposition (iCVD) of a Novel Thermally Responsive Copolymer
✍ Scribed by Mahriah E. Alf; Paul D. Godfrin; T. Alan Hatton; Karen K. Gleason
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 481 KB
- Volume
- 31
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
A novel thermally responsive copolymer p(NIPAAm‐co‐DEGDVE) is synthesized using the substrate independent method of iCVD and exhibits a sharp lower critical solution temperature (LCST) transition centered at ≈28.5 ± 0.3 °C determined via quartz crystal microbalance measurements with dissipation monitoring (QCM‐D). Swelling with water below the LCST produces a reversible change of ≈3× in film thickness. The layer is conformal on nanostructured surfaces including MWCNT forests and electrospun nanofiber mats. Modified planar substrates exhibit ≈30°change in static contact angle over the LCST, while through conformal coating on nanostructured substrates changes in static contact angle up to 135° are achieved. Additionally, coated surfaces exhibit temperature sensitive BSA adsorption measured by QCM‐D and is reversible as shown through fluorescence imaging of a coated electrospun nanofiber mat.
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