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Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
Research Interests
  • Biomimetics
  • Multiscale manufacturing
  • Micro/nanofabrication


Wetting transition and optimal design for microstructured surfaces with hydrophobic and hydrophilic materials

DC Field Value Language Park, Chan Ick ko Jeong, Hoon Eui ko Lee, Sung Hoon ko Cho, Hye Sung ko Suh, Kahp Y. ko 2014-10-17T08:39:23Z - 2014-10-17 ko 2009-08 -
dc.identifier.citation JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.336, no.1, pp.298 - 303 ko
dc.identifier.issn 0021-9797 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract We present wetting transition of a water droplet on microstructured polymer surfaces using materials with different hydrophilicity or hydrophobicity: hydrophobic polydimethyl siloxane (PDMS) (θwater ∼ 110°) and hydrophilic Norland Optical Adhesive (NOA) (θwater ∼ 70°). The microstructures were fabricated by replica molding and self-replication with varying pillar geometry [diameter: 5 μm, spacing-to-diameter ratio (s/d): 1-10 (equal interval), height-to-diameter ratio (h/d): 1-5] over an area of 100 mm2 (10 mm × 10 mm). Measurements of contact angle (CA) and contact angle hysteresis (CAH) demonstrated that wetting state was either in the homogeneous Cassie regime or in the mixed regime of Cassie and Wenzel states depending on the values of s/d and h/d. These two ratios need to be adjusted to maintain stable superhydrophobic properties in the Cassie regime; s/d should be smaller than ∼7 (PDMS) and ∼6 (NOA) with h/d being larger than ∼2 to avoid wetting transition by collapse of a water droplet into the microstructure. Based on our observations, optimal design parameters were derived to achieve robust hydrophobicity of a microstructured surface with hydrophobic and hydrophilic materials. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.subject Capillary force ko
dc.subject Microstructure ko
dc.subject Polymer ko
dc.subject Replica molding ko
dc.subject Soft lithography ko
dc.subject Wetting transition ko
dc.title Wetting transition and optimal design for microstructured surfaces with hydrophobic and hydrophilic materials ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-67349225935 ko
dc.identifier.wosid 000266845400039 ko
dc.type.rims ART ko
dc.description.wostc 46 *
dc.description.scopustc 40 * 2015-05-06 * 2014-10-17 *
dc.identifier.doi 10.1016/j.jcis.2009.04.022 ko
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