Wettability Control and Flow Regulation Using a Nanostructure-Embedded Surface

    Authors

    E. Y. Tafti; G. Londe; A. Chunder; L. Zhai; R. Kumar;H. J. Cho

    Comments

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    Abbreviated Journal Title

    J. Nanosci. Nanotechnol.

    Keywords

    Wetting; Layer-by-Layer; Thermoresponsive Polymer; Valve; Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials; Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

    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.

    Journal Title

    Journal of Nanoscience and Nanotechnology

    Volume

    11

    Issue/Number

    2

    Publication Date

    1-1-2011

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    1417

    Last Page

    1420

    WOS Identifier

    WOS:000287167900085

    ISSN

    1533-4880

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