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Micro- and nano-porous surface patterns prepared by surface-confined directional melt crystallization of solvent

Authors
Kim, Byoung SooKim, Hyun JinAn, SuyeongChi, SangwonKim, JunseokLee, Jonghwi
Issue Date
1-Jul-2017
Publisher
ELSEVIER SCIENCE BV
Keywords
Ice templating; Freeze casting; Directional freezing; Melt crystallization; 1,4-dioxane; Shear stress; Freeze drying; Polymer solute
Citation
JOURNAL OF CRYSTAL GROWTH, v.469, pp 184 - 190
Pages
7
Journal Title
JOURNAL OF CRYSTAL GROWTH
Volume
469
Start Page
184
End Page
190
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18986
DOI
10.1016/j.jcrysgro.2016.08.065
ISSN
0022-0248
1873-5002
Abstract
Recently, numerous attempts have been made to engineer micro- and nano-porous surface patterns or to develop convenient preparation methods for the practical applications of self-cleaning surfaces, water-repellent surfaces, novel textures, etc. Herein, we introduce a simple, cheap, and repeatable crystallization-based method to produce porous surface structures, on any surface of already fabricated polymeric materials. Contact of the solvent phase with cooled polymer surfaces enabled the limited dissolution of the surfaces and the subsequent extremely fast melt crystallization of the solvent. After removing the crystals, various micro- and nano-porous patterns were obtained, whose pore sizes ranged over three orders of magnitude. Pore depth was linearly dependent on the dissolution time. Crystal growth was mainly directed normal to the surfaces, but it was also controlled in-plane, resulting in cylindrical or lamellar structures. Superhydrophobic surfaces were successfully prepared on both polystyrene and polycarbonate. This process offers a novel surface engineering tool for a variety of polymer surfaces, whose topology can be conveniently controlled over a wide range by crystal engineering. (C) 2016 Elsevier B.V. All rights reserved.
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공과대학 (화학공학과)
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