Journal
SURFACE SCIENCE
Volume 602, Issue 19, Pages 3100-3105Publisher
ELSEVIER
DOI: 10.1016/j.susc.2008.07.044
Keywords
Thermo-responsive wettability; Layer-by-layer assembly; Poly(N-isopropylacrylamide) copolymer
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Funding
- Center for Nanostructural Materials Technology [08K1501-00810]
- KOSEF [R01-2006-000-10749-0]
- National Research Foundation of Korea [2000020001000008000108, 과C6A1906, R01-2006-000-10749-0, 15-2008-00-007-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We describe the facile fabrication of a thermo-responsive wetting surface through an electrostatic assembly process and the use of thermo-responsive polyelectrolyte copolymers. The organic-inorganic nano-structured films were prepared through the layer-by-layer assembly of negatively charged silica nanoparticles (11 nm) and positively charged poly(allylamine hydrochloride) (PAH). The thermo-responsive polyelectrolyte copolymer, poly(allylamine hydrochloride)-g-poly(N-isopropylacrylamide) (PAH-g-PNIPAAm), was synthesized by grafting a carboxylic end group of PNIPAAm on to the PAH. The nanostructured surfaces modified with PAH-g-PNIPAAm exhibit enhanced thermal switching of surface wettability. Our approach provides a versatile strategy for control over the thermo-responsive wettability of substrates with complex structures for various applications such as sensors, microfluidics, etc. (C) 2008 Elsevier B.V. All rights reserved.
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