Open Access System for Information Sharing

Login Library

 

Thesis
Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Fast and Reversibly Swtichable Wettability Induced by Photothermal Effect

Title
Fast and Reversibly Swtichable Wettability Induced by Photothermal Effect
Authors
신지현
Date Issued
2012
Publisher
포항공과대학교
Abstract
We prepared the smart surfaces capable of fast switching between hydrophilic and hydrophobic states by visible light irradiation. For this purpose, we first prepared rough surfaces on a silicon wafer by using the layer-by-layer (LBL) deposition. The substrate was alternately immersed into an aqueous solution with poly(allylamine hydrochloride) (PAH) and another aqueous solution containing SiO2 nanoparticles having diameter of ~ 11nm. Then, the substrate was successively immersed into another solution having poly(styrene sulfonic acid) (PSS) and an aqueous solution with gold nanoparticles having diameter of ~50 nm. Finally, thermally responsive poly(N-isopropylacrylamide) (PNIPAM) film was grafted on (SiO2/PAH)10(PSS/Au)20 surface by using surface-initiated atom transfer radical polymerization. Since the PNIPAM/water mixture system shows the phase behavior with lower critical solution temperature, the wettability of the fabricated surface is changed with the film temperature. The temperature of the fabricated film in this study was controlled by the heat generation arising from the photothermal effect of Au nanoparticles in the presence of visible light. We found that the wettability of the fabricated surface was fast switched reversibly between hydrophilic and hydrophobic properties without and with visible light illumination on the film. The surfaces introduced in this study could be used in functional textiles, intelligent microfluidic switching machine, controllable drug releases, and light-responsive filters.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001216771
http://oasis.postech.ac.kr/handle/2014.oak/1397
Article Type
Thesis
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Views & Downloads

Browse