Wetting properties of patterned silicon microchannels with tunable surface energy using layer-by-layer nano self-assembly

Tao Zhang, Tianhong Cui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The wettability of patterned silicon microchannels with tunable surface free energy through coating hydrophilic TiO2 nanoparticles using layer-by-layer (LbL) nano self-assembly technique is presented in this paper. Wettability of microchannels is tested by measuring the contact angle of a water droplet on the substrate. The capillary rise rate is tested by measuring the front location of liquid on the silicon microchannel surface laid on a 45 degree inclined platform. It is found that the silicon microchannels with tunable surface free energy have super-hydrophilic wettability, and demonstrate powerful capillary. For the silicon microchannels 200 μm wide, the liquid front can move up 40 mm in approximately 3 second. Fourier transformed infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) reveal the generation of -OH radicals after coating TiO2 nanoparticals, verifying that the -OH radicals have a strong effect on the hydrophilicity. The super-hydrophilic patterned microchannels suggest potential applications to microfluidic systems and heat diffusion systems based on liquid surface tension.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Pages367-373
Number of pages7
DOIs
StatePublished - Jul 12 2010
EventASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 - Shanghai, China
Duration: Dec 18 2009Dec 21 2009

Publication series

NameProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
Volume1

Other

OtherASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
CountryChina
CityShanghai
Period12/18/0912/21/09

Keywords

  • Layer-by-layer nano self-assembly
  • Superhydrophilic microchannel
  • TiO nanoparticles
  • Wettability

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