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  • Eccentricity Effect of Micropatterned Surface on Contact Angle

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    Author(s)
    Kashaninejad, Navid
    Chan, Weng Kong
    Nam-Trung, Nguyen
    Griffith University Author(s)
    Nguyen, Nam-Trung
    Kashaninejad, Navid
    Year published
    2012
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    Abstract
    This article experimentally shows that the wetting property of a micropatterned surface is a function of the center-to-center offset distance between successive pillars in a column, referred to here as eccentricity. Studies were conducted on square micropatterns which were fabricated on a silicon wafer with pillar eccentricity ranging from 0 to 6 孠for two different pillar diameters and spacing. Measurement results of the static as well as the dynamic contact angles on these surfaces revealed that the contact angle decreases with increasing eccentricity and increasing relative spacing between the pillars. Furthermore, ...
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    This article experimentally shows that the wetting property of a micropatterned surface is a function of the center-to-center offset distance between successive pillars in a column, referred to here as eccentricity. Studies were conducted on square micropatterns which were fabricated on a silicon wafer with pillar eccentricity ranging from 0 to 6 孠for two different pillar diameters and spacing. Measurement results of the static as well as the dynamic contact angles on these surfaces revealed that the contact angle decreases with increasing eccentricity and increasing relative spacing between the pillars. Furthermore, quantification of the contact angle hysteresis (CAH) shows that, for the case of lower pillar spacing, CAH could increase up to 41%, whereas for the case of higher pillar spacing, this increment was up to 35%, both corresponding to the maximum eccentricity of 6 孮 In general, the maximum obtainable hydrophobicity corresponds to micropillars with zero eccentricity. As the pillar relative spacing decreases, the effect of eccentricity on hydrophobicity becomes more pronounced. The dependence of the wettability conditions of the micropatterned surface on the pillar eccentricity is attributed to the contact line deformation resulting from the changed orientation of the pillars. This finding provides additional insights in design and fabrication of efficient micropatterned surfaces with controlled wetting properties.
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    Journal Title
    Langmuir
    Volume
    28
    Issue
    10
    DOI
    https://doi.org/10.1021/la300416x
    Copyright Statement
    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright 2012 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/la300416x.
    Subject
    Microelectromechanical systems (MEMS)
    Publication URI
    http://hdl.handle.net/10072/50266
    Collection
    • Journal articles

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