Tunable wetting properties of patterned silicon microchannels with varied surface free energy based on layer-by-layer nano self-assembly

Tao Zhang, Tianhong Cui

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number045015
JournalJournal of Micromechanics and Microengineering
Volume21
Issue number4
DOIs
StatePublished - Apr 1 2011

Fingerprint Dive into the research topics of 'Tunable wetting properties of patterned silicon microchannels with varied surface free energy based on layer-by-layer nano self-assembly'. Together they form a unique fingerprint.

Cite this