Reversible Controlling Underwater Oil Adhesion on Shape Memory Polymer Surface†

doi:10.7503/cjcu20160231

Abstract

Abstract:

A surface with shape memory microstructures was prepared by the template method, after O₂ plasma. The surface shows low adhesive underwater superoleophobicity. It is found that under the external pressure, the surface would lose the underwater superoleophobicity for the destroyed microstructure, and meanwhile, the surface becomes high adhesive to the oil droplet. After heating the surface at 120 ℃ and plasma action, both surface microstructure and the low adhesive superhydrophobicity can be recovered. The results indicate that the adhesive property can be controlled reversibly by controlling the surface microstructures. Different microstructures results in different wetting states, as a result, the surface shows different adhesions. On the surface with hierarchical structures, oil droplet resides in the low adhesive Cassie state, while on the crushed surface, the oil droplet resides in the high adhesive Wenzel state.

Key words: Shape memory polymer, Microstructure, Underwater superoleophobic, Adhesion, Reversible controlling

CLC Number:

O631
O647

TrendMD:

LÜ Tong,CHENG Zhongjun,LAI Hua,ZHANG Enshuang,LIU Yuyan. Reversible Controlling Underwater Oil Adhesion on Shape Memory Polymer Surface^†[J]. Chem. J. Chinese Universities, 2016, 37(8): 1559.

Figures/Tables 7

Fig.1 SEM images of Ni/NiO template with different magnifications

Fig.2 SEM images of surface (A) The as-prepared surface; (B) magnified image of (A); (C) the surface after pressing; (D) the surface after heating treatment.

Table 1 XPS analysis of surface before and after plasma treating

Sample	Elemental content(%)
Sample	C	O	N
Untreated	72.53	24.70	2.77
Plasma treated	64.39	32.78	2.83

Fig.3 Wettabilities of as-prepared surface (A, B) Shapes of a water droplet on the as-prepared hierarchical structured surface before(A) and after(B) plasma treating; (C, D) an oil droplet(4 μL, 1,2-dichloroethane) stands(C) and rolls(D) on the plasma treated hierarchical structured surface in water; (E, F) shapes of a water droplet on the surface with crushed microstructures before(E) and after(F) plasma action; (G, H) an oil droplet(4 μL, 1,2-dichloroethane) stands(G) and be pinned(H) on the plasma treated surface with crushed microstructures(B) in water.

Fig.4 Statistics of sliding angles on surface with different microstructures for different oils

Fig.5 Force-distance curves for surface at different states (A) The original state; (B) the crushed state after pressing; (C) restored state after heating; (D) the adhesive force between the surface and an oil(1,2-dichloroethane) droplet can be changed by reversibly as the surface microstructures were changed alternately. All surfaces have been treated with O2 plasma action before measurement.

Fig.6 Schematic illustration of different wetting states for oil droplet in water (A) Low adhesive Cassie state; (B) high adhesive Wenzel state.

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