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Facile control of surface wettability in TiO <inf>2</inf>/poly(methyl methacrylate) composite films

Yang, M and Di, Z and Lee, JK (2012) Facile control of surface wettability in TiO <inf>2</inf>/poly(methyl methacrylate) composite films. Journal of Colloid and Interface Science, 368 (1). 603 - 607. ISSN 0021-9797

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A facile method to produce very hydrophobic surface was developed simply using the mixture of TiO 2 nanoparticles and poly(methyl methacrylate) (PMMA). When the volume ratio of TiO 2 to PMMA is between 35vol.% and 50vol.%, the mixture of two hydrophilic materials became very hydrophobic. Analysis of the molecular structure by infrared spectroscopy shows that the preferential orientation and attachment of a carbonyl group of a polymer molecule to the surface of TiO 2 nanoparticles play a critical role in the appearance of the strong hydrophobicity. When this composite was exposed to UV light, PMMA on the surface of the mixture film was decomposed through a photocatalytic reaction and the very hydrophobic surface turned to the superhydrophilic one. The superhydrophilic property of UV-irradiated composite lasts as long as several months. This long lasting superhydrophilicity is ascribed to the porous structure, which provides high roughness and strong capillary interaction. Easy transition from strong hydrophobicity to superhydrophilicity in TiO 2/PMMA composites could be applied to designing high contrast hydrophilic/hydrophobic patterns. © 2011 Elsevier Inc.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Yang, M
Di, Z
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 15 February 2012
Date Type: Publication
Journal or Publication Title: Journal of Colloid and Interface Science
Volume: 368
Number: 1
Page Range: 603 - 607
DOI or Unique Handle: 10.1016/j.jcis.2011.11.037
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0021-9797
Date Deposited: 21 Oct 2014 17:18
Last Modified: 22 Jun 2021 13:56


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