The performance of superhydrophobic and superoleophilic carbon nanotube meshes in water-oil filtration

被引：276

作者：

Lee, Chee Huei ^{[1
]}

Johnson, Nick ^{[2
]}

Drelich, Jaroslaw ^{[2
]}

Yap, Yoke Khin ^{[1
]}

机构：

[1] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA

[2] Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA

来源：

CARBON | 2011年 / 49卷 / 02期

基金：

美国国家科学基金会;

关键词：

BORON-NITRIDE NANOTUBES; SURFACES; GROWTH; HYDROPHOBICITY; WETTABILITY; STRENGTH; PURITY;

D O I：

10.1016/j.carbon.2010.10.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Vertically-aligned multi-walled carbon nanotubes (CNTs) were grown on stainless steel (SS) mesh by thermal chemical vapor deposition with a diffusion barrier of Al2O3 film. These three-dimensional porous structures (SS-CNT meshes) were found to be superhydrophobic and superoleophilic. Water advancing contact angles of 145-150 degrees were determined for these SS-CNT meshes in air and oil (gasoline, isooctane). Oil, on the other hand, completely wet the SS-CNT meshes. This combined superhydrophobic and superoleophilic property repelled water while allowed the permeation of oil. Filtration tests demonstrated efficiencies better than 80% of these SS-CNT meshes as the filtration membranes of the water-in-oil emulsions. We have conducted quantitative analysis on the diameters of the oil droplets in both the feed emulsion and the filtrate. Then, we have evaluated the issue of water blockage and possible way to improve the filtration efficiency. Finally, the filtration and blockage mechanisms are proposed. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：669 / 676

页数：8

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