Fast formation of superhydrophobic octadecylphosphonic acid (ODPA) coating for self-cleaning and oil/water separation

被引:65
|
作者
Dai, Chunai [1 ,2 ]
Liu, Na [1 ]
Cao, Yingze [1 ]
Chen, Yuning [1 ]
Lu, Fei [1 ]
Feng, Lin [1 ]
机构
[1] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
[2] Beijing Jiaotong Univ, Sch Sci, Beijing 100044, Peoples R China
基金
国家高技术研究发展计划(863计划); 美国国家科学基金会;
关键词
ASSEMBLED MONOLAYERS; COPPER CORROSION; OIL; SUBSTRATE; FILMS; WATER; MESH; STABILITY; OXIDATION; KINETICS;
D O I
10.1039/c4sm01616e
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
A simple and fast method to prepare robust superhydrophobic octadecylphosphonic acid (ODPA) coating on oxidized copper mesh for self-cleaning and oil/water separation is reported here. The substrate of the copper mesh was first oxidized by simple immersion in an aqueous solution of 1.0 M NaOH and 0.05 M K2S2O8 at room temperature for 30 min, which was then covered with micro-and nanoscale Cu(OH)(2) on the surface. Subsequently, the oxidized copper mesh was immersed in 2 x 10(-4) M octadecylphosphonic acid/tetrahydrofuran (ODPA/THF) solution, an ODPA coating formed on the oxidised copper mesh. The ODPA coating formation process takes place rapidly, almost in 1 second, which makes the as-prepared mesh exhibit superhydrophobicity with the water contact angle of approximately 158.9 degrees and superoleophilicity with the oil contact angle of 0 degrees. Moreover, the as-prepared mesh has self-cleaning effect and can be repeatedly used to efficiently separate a series of oil/water mixtures like gasoline/water and diesel/water. Interestingly, straightforward oxidation of a copper substrate produces a "water-removing" type oil/water separation mesh with underwater superoleophobicity, whereas ODPA coating on the oxidized copper mesh produces an "oil-removing" type oil/water separation mesh with superhydrophobicity and superoleophilicity. This interesting conversion results from a small amount of ODPA and takes place very rapidly.
引用
收藏
页码:8116 / 8121
页数:6
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