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Sequential liquid separation using meshes with hierarchical microcube-nanohole structure and controlled surface wettability

Title
Sequential liquid separation using meshes with hierarchical microcube-nanohole structure and controlled surface wettability
Authors
Woo, SeeunKwak, WonshikHwang, Woonbong
POSTECH Authors
Hwang, Woonbong
Date Issued
Dec-2018
Publisher
ELSEVIER SCIENCE BV
Abstract
In actual industrial processes, in addition to separation of just water and oil, separation of multiphase liquids and separation of organic solvents are also required. Here, we demonstrate successful multiphase liquid separation by simply applying different coating materials to aluminum meshes with a hierarchical microcubic and nanohole structure. A gravity-driven multiphase separation system was designed using these meshes as the separation media, and it showed high collection rate (99%) and high content ratio (95%). The fabricated separation system could sequentially separate liquids with surface tension of < 21.6, 21.6-32.0, and > 32.0 mN/m by choosing a filter with the proper surface energy. Given the small differences in the surface tension of the liquids used in this study, the separation system with a surface-energy-controlled filter can be an impressive tool to separate numerous liquid mixtures.
In actual industrial processes, in addition to separation of just water and oil, separation of multiphase liquids and separation of organic solvents are also required. Here, we demonstrate successful multiphase liquid separation by simply applying different coating materials to aluminum meshes with a hierarchical microcubic and nanohole structure. A gravity-driven multiphase separation system was designed using these meshes as the separation media, and it showed high collection rate (99%) and high content ratio (95%). The fabricated separation system could sequentially separate liquids with surface tension of < 21.6, 21.6-32.0, and > 32.0 mN/m by choosing a filter with the proper surface energy. Given the small differences in the surface tension of the liquids used in this study, the separation system with a surface-energy-controlled filter can be an impressive tool to separate numerous liquid mixtures.
Keywords
Aluminum coatings; Hydrophobicity; Interfacial energy; Liquids; Packed beds; Self assembled monolayers; Surface tension; Industrial processs; Liquid separation; Multiphase liquid; Nanohole structures; Self-assembled monolayer coatings; Separation systems; Superhydrophobic; Surface wettability; Separation
URI
http://oasis.postech.ac.kr/handle/2014.oak/94256
DOI
10.1016/j.apsusc.2018.08.102
ISSN
0169-4332
Article Type
Article
Citation
APPLIED SURFACE SCIENCE, vol. 462, page. 237 - 242, 2018-12
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 HWANG, WOON BONG
Dept of Mechanical Enginrg
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