Preparation of Copper Surfaces with Controlled Wettability Through the Molecular Self-assembling Process†

doi:10.7503/cjcu20130705

Abstract

Abstract:

We report a novel method for the fabrication of copper surfaces with controlled wettability. Through modification of the nanostructured copper substrates with mixed thiol molecules of HS(CH₂)₉CH₃ and HS(CH₂)₁₁OH, surfaces with controlled wettability from superhydrophobicity to superhydrophilicity can be achieved by simply controlling the concentration of HS(CH₂)₁₁OH in the modified solution. The controllability of the surfaces wettability can be ascribed to the combined effect of the surface chemistry variation and the hierarchical micro/nanostructures on the substrates. Especially the presence of hierarchical micro/nanostructures, which can provide a better control of the surface wettability between the two extremes: superhydrophobicity and superhydrophilicity.

Key words: Superhydrophobic surface, Superhydrophilic surface, Molecular self-assemble, Wettability, Copper surface

CLC Number:

O647
O631

TrendMD:

DU Ying, CHEN Haijie, CHENG Zhongjun, LAI Hua, ZHANG Naiqing, SUN Kening. Preparation of Copper Surfaces with Controlled Wettability Through the Molecular Self-assembling Process^†[J]. Chem. J. Chinese Universities, 2014, 35(1): 105.

Figures/Tables 6

Fig.1 SEM images of copper surfaces before(A) and after(B, C) immersion into solution containing NaOH and (NH4)2S2O8 for about 1 h(C) Magnified image of (B); (D) cross-sectional view of the surface.

Fig.2 XRD pattern of the copper surface after immersion into solution containing NaOH and (NH4)2S2O8 for about 1 h

Fig.3 XPS survey spectrum of the surface prepared with xOH=0(A), high-solution C1s XPS spectra of the surface prepared with xOH=0.3(B) and dependence of the ratio of IC—O/IC—C vs. xOH(C)

Fig.4 Shapes of a water droplet on the surfaces prepared with xOH=0(A) and xOH=1(B)

Fig.5 Dependence of the contact angle vs. xOH on flat(a) and rough(b) surfaces

Fig.6 Schematic illustration of the interaction between water droplet and the surfaces(A) The surface is superhydrophobic and a water droplet can stand on the surface with a layer of air under itself; (B) the surface is superhydrophilic and water can enter into the microstructures on the substrate; (C) when the surface prepared with low xOH, the surface is mainly covered with hydrophobic HS(CH2)9CH3, and show superhydrophobicity; (D) as the xOH is increased, more hydroxyl groups would be assembled on the surface and the surface would show supehydrophilicity.

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