Zhang, Tao and Cui, Tianhong (2011) Tunable wetting properties of patterned silicon microchannels with varied surface free energy based on layer-by-layer nano self-assembly. Journal of Micromechanics and Microengineering, 21 (4). 045015.
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Official URL: http://stacks.iop.org/0960-1317/21/i=4/a=045015
The wetting properties of patterned silicon microchannels with tunable surface free energy through coating hydrophilic TiO 2 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 45Â° 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 Âµm 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 âOH radicals after coating TiO 2 nanoparticles, verifying that the âOH 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.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||01 Nov 2011 23:24|
|Last Modified:||02 Nov 2011 00:47|
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