Icephobic Property on Multiscale Flexible Structures†

doi:10.7503/cjcu20150248

Abstract

Abstract:

A kind of soft micro-ratchet/nano-rods structure surface was fabricated by intergrating the methods of soft-lithography and crystal growth, which realized low adhesion and icephobic properties in low temperature environment. The droplet could be driven off before it freezes by the deformation of micro-ratchet. The results indicate that the bend effect changes the three phase contact line and generates droplet-driven performance with different bend angles. The dent effect increases the three phase contact line and increases the difficulty for driving droplet. While, the raised effect decreases the three phase contact line and decreases the adhesion force between liquid and solid, which makes the droplet off the surface easily with the effect of gravity. This special structure has real potential in icephobic field.

Key words: Soft-lithography, Crystal growth, Three phase contact line, Icephobic, Flexible structure

CLC Number:

O647

TrendMD:

WANG Lei, HOU Yongping, ZHENG Yongmei. Icephobic Property on Multiscale Flexible Structures^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1548.

Figures/Tables 6

Fig.1 SEM images of the surface structure(A, C) Top and side view of microstructures; (B, D) top and side view of nanostructures;(E—G) initial state, dent state and raised state.

Fig.2 Relationship between periodicity and bend angle

Fig.3 Relationship of contact angle and sliding angle(A) and adhesion force(B) with temperature

Fig.4 In situ observation of ice delay time on the surface(A)—(D) The icing and melting processes; (E) the relationship of ice/melt times and ice delay time.

Fig.5 Droplet driven processes in two bend states(A, B) and the relationship of bend angles and ACA/RCA(C)

Fig.6 Droplet driven processes in two bend directions(A, C) and the sketches of driven state in two directions(B, D)

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