TY - JOUR
T1 - Tunable wetting properties of patterned silicon microchannels with varied surface free energy based on layer-by-layer nano self-assembly
AU - Zhang, Tao
AU - Cui, Tianhong
PY - 2011/4
Y1 - 2011/4
N2 - The wetting properties of patterned silicon microchannels with tunable surface free energy through coating hydrophilic TiO2 nanoparticles using the layer-by-layer nano self-assembly technique is presented in this paper. The 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 a liquid on the silicon microchannel surface laid on a 45° inclined platform. It is found that the silicon microchannels with tunable surface free energy have super-hydrophilic wettability, and demonstrate a powerful capillary. For the silicon microchannels 200 μm wide, the liquid front can move up 40 mm in approximately 3 s. Fourier transformed infrared spectroscopy and x-ray photoelectron spectroscopy reveal the generation of -OH radicals after coating TiO2 nanoparticles, verifying that the -OH radicals have a strong effect on the hydrophilicity. The patterned super-hydrophilic microchannels provide potential applications to microfluidic systems and heat diffusion systems based on tunable surface energy.
AB - The wetting properties of patterned silicon microchannels with tunable surface free energy through coating hydrophilic TiO2 nanoparticles using the layer-by-layer nano self-assembly technique is presented in this paper. The 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 a liquid on the silicon microchannel surface laid on a 45° inclined platform. It is found that the silicon microchannels with tunable surface free energy have super-hydrophilic wettability, and demonstrate a powerful capillary. For the silicon microchannels 200 μm wide, the liquid front can move up 40 mm in approximately 3 s. Fourier transformed infrared spectroscopy and x-ray photoelectron spectroscopy reveal the generation of -OH radicals after coating TiO2 nanoparticles, verifying that the -OH radicals have a strong effect on the hydrophilicity. The patterned super-hydrophilic microchannels provide potential applications to microfluidic systems and heat diffusion systems based on tunable surface energy.
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U2 - 10.1088/0960-1317/21/4/045015
DO - 10.1088/0960-1317/21/4/045015
M3 - Article
AN - SCOPUS:79953645181
SN - 0960-1317
VL - 21
JO - Journal of Micromechanics and Microengineering
JF - Journal of Micromechanics and Microengineering
IS - 4
M1 - 045015
ER -