Antibacterial Superhydrophobic-oleophobic Coating Fabricated by Candle Soot†

doi:10.7503/cjcu20180485

Abstract

Abstract:

Superhydrophobic-oleophobic coating with excellent antibacterial property was fabricated by chemical vapor deposition(CVD) on the surfaces of candle soot with silicon dioxide(SiO₂) and trichloro(1H,1H,2H,2H-perfluorooctyl) silane(TMEDA). Morphological analysis by scanning electron microscope(SEM) showed that the candle soot possessed porous network nanostructure. The wetting property results by water contact angle characterization showed SiO₂ deposited coating exhibiting superhydrophilic-lipophilic property which can be attributed to synergistic action of porous network nanostructure and SiO₂. When further deposited by TMEDA on the surfaces of SiO₂ deposited coating, not only the porous network nanostructure of coating was leaved behind, but also the superhydrophilic-lipophilic property of coating was transformed into superhydrophobic-oleophobic property. Such prepared superhydrophobic-oleophobic coating possesses higher antibacterial property by weakening the adsorption of bacteria on the solid surface. The synergistic action of superhydrophobic-oleophobic property and porous network structure leads to the excellent antifouling property of superhydrophobic-oleophobic coating. The superhydrophobic-oleophobic coating made up of candle soot may provide one new simple and effective approach for antibacteria in industrial unit and public environment.

Key words: Coating, Superhydrophobic, Oleophobic, Antibacterial property, Candle soot

CLC Number:

O632

TrendMD:

XIE Chao,HONG Guohui,YANG Weiqiang,WANG Jiku,ZHAO Lina. Antibacterial Superhydrophobic-oleophobic Coating Fabricated by Candle Soot^†[J]. Chem. J. Chinese Universities, 2019, 40(2): 379.

Figures/Tables 5

Scheme 1 Fabricaion process of superamphiphobic coating(A) The formation of candle soots on glass slide; (B) CVD with TEOS and ammonia solution on candle soot; (C) calcination of the coating in (B); (D) CVD with TMEDA on coating of (C).

Fig.1 SEM images of different coatings(A) Candle soot coating; (B) candle soot coating after CVD for 24 h by TEOS and aqueous ammonia solution; (C) coating in (B) after heating for 2 h at 550 ℃; (D) coating in (C) after CVD for 3 h by TMEDA.

Fig.2 Static contact angles of water(A, C) and peanut oil(B, D) on coating Ⅰ(A, B) and coating Ⅱ(C, D)

Fig.3 Static contact angles of water(A, C) and peanut oil(B, D) on silicon dioxide coating(A, B) and TMEDA coating(C, D)

Fig.4 Representative SEM images of E. coli attached on different coatings(A) Glass wafer; (B) superhydrophobic-oleophobic coating; (C) superhydrophilic-oleophilic coating; (D) TMEDA coating. Concentration of bacteria/(Cell·cm-2): (A) 450×105; (B) 0; (C) 180×105; (D) 150×105.

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