title: Wettability control and flow regulation using a nanostructure-embedded surface.
abstract: This work addresses the synthesis, integration and characterization of a nanostructure-embedded thermoresponsive surface for flow regulation. In order to create a hierarchic structure which consists of microscale texture and nanoscale sub-texture, hybrid multilayers consisting of poly(allylamine hydrochloride) (PAH), poly(acrylic acid) (PAA) and colloidal silica nanoparticles (average diameter = 22 nm and 7 nm) were used. Based on the electrostatic interactions between the polyelectrolytes and nanoparticles, a layer-by-layer deposition technique in combination with photolithography was employed to obtain a localized, conformally-coated patch in a microchannel. Grafted with the thermoresponsive polymer, poly(N-isopropylacrylamide) (PNIPAAm), wettability of the surface could be tuned upon heating or cooling. The measurement of differential pressure at various stages of device verified the working conditions of the nanostructure-embedded surface for regulating a capillary flow in the microchannel.
authors: Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, USA.
authors: Ehsan Yakhshi
authors: EY
authors: Tafti
authors: Ghanashyam
authors: G
authors: Londe
authors: Anindarupa
authors: A
authors: Chunder
authors: Lei
authors: L
authors: Zhai
authors: Ranganathan
authors: R
authors: Kumar
authors: Hyoung J
authors: HJ
authors: Cho