Self-propelled Droplet Movement on Micro/nano Anisotropic Structures Surface†

doi:10.7503/cjcu20170329

Abstract

Abstract:

The micro/nano anisotropic structures was controllably fabricated by soft lithography using polydimethylsiloxane(PDMS) and Co nanoparticle composite under the external magnetic field and covering of ZnO nanohairs via nanocrystalline growth technique. The sample is covered with periodicities of ca. 400 μm conical fibers and the conical fibers diameter of ca. 200 μm. The tip diameter of cone is ca. 80 μm. The length of the cone is ca. 1 mm. The ZnO nanohairs cover fully over every fibers, where the ZnO nanohairs have the diameters of 80—100 nm and the lengths of ca. 1 μm. The sample is hydrophobic with a contact angle of 142.5° andanisotropic wettability. The result indicates that the droplets can roll under vertical vibration or bounce directionally. This finding offers an insight into design of functional structures for droplets move in direction.

Key words: Micro/nano, Anisotropic, Droplets rolling-off, Bounce in direction

CLC Number:

O647

TrendMD:

LI Dan, ZHENG Yongmei. Self-propelled Droplet Movement on Micro/nano Anisotropic Structures Surface^†[J]. Chem. J. Chinese Universities, 2018, 39(1): 109.

Figures/Tables 4

Fig.1 SEM images in the side view of the right(A)and oblique(B) conical fibers array(C), (D) SEM images in high magnification, the conical fibers are covered by ZnO nanohairs.

Fig.2 In situ observation of ZnO nanohairs strength on PDMSThe SEM images of the strength tests of the nanostructures on oblique fiber with ZnO nanohairs. The in situ observation shows the robust strength performance of ZnO nanohairs on PDMS. The stress-strain deformation of the nanostructures are tested by the indenter with an apex diameter of 5 μm, and the pressing depth is 4 μm.

Fig.3 Static contact angles of the droplet on different surfaces with/without nanohairs(A), rolling-off angles of droplets in different volumes(6, 8, 10 and 12 μL) on the oblique conical fibers array of PDMS with nanohairs along(B) or against(C) the direction of fibers, retention force of droplets in different volumes(6, 8, 10 and 12 μL) on the oblique conical fibers array of PDMS with nanohairs along/ against the direction of fibers(D) and observation on dynamic receding process, the contact line breaks away along the direction of fibers preferentially(E)

Fig.4 Top view of deposited droplet directional transports oblique conical fibers arrays along the direction of fibers(A) and side view of the unidirectional bounce property of drop on the oblique conical fibers arrays of PDMS(B)

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