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Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
Research Interests
  • Biomimetics

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Extreme hydrophobicity and omniphilicity of high-aspect-ratio silicon structures

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Title
Extreme hydrophobicity and omniphilicity of high-aspect-ratio silicon structures
Author
Kwak, Moon KyuPark, Cheol WooHwang, Kwang-IlPark, Choon ManJeong, Hoon EuiChoi, Jun Ho
Keywords
Black silicon;  selective wetting;  purification;  superhydrophobic surface;  environmental remediation
Issue Date
201503
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Citation
MODERN PHYSICS LETTERS B, v.29, no.6-7, pp.1540009 -
Abstract
We present an application of high-aspect-ratio (high-AR) silicon structures (black silicon) with high water repellency and good wettability by oils and solvents. The fabrication of black silicon consists of a deep reactive-ion etching process for extremely-high-AR silicon structures and surface treatment with C4F8 gas. Such high-AR structures were found to be highly resistant against wetting by water, but they also have good wetting characteristics with respect to certain liquids such as ethanol, hexane and mineral oil. To determine the relationship between the AR of nanostructures and wetting selectivity, four different black silicon samples with different pattern heights were used. The static contact angles of various liquid were measured for the analysis of wetting properties of the four black silicon samples. To explore feasible applications, ethanol-water separation was performed as a miniaturized experimental simulation of environmental remediation
URI
http://scholarworks.unist.ac.kr/handle/201301/17424
DOI
http://dx.doi.org/10.1142/S0217984915400096
ISSN
0217-9849
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MNE_Journal Papers
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