Spatially Engraving Morphological Structure on Polymeric Surface by Ion Beam Milling

Sun, Ansu, Wang, Ding, Zhou, Hongzhao, Li, Yifan, Connor, Chris, Kong, Jie, Sun, Jining and Xu, Bin (2019) Spatially Engraving Morphological Structure on Polymeric Surface by Ion Beam Milling. Polymers, 11 (7). p. 1229. ISSN 2073-4360

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Abstract

Polymer surface patterning and modification at the micro/nano scale has been discovered with great impact in applications such as microfluidics and biomedical technologies. We propose a highly efficient fabricating strategy, to achieve a functional polymer surface, which has control over the surface roughness. The key development in this fabrication method is the polymer positive diffusion effect (PDE) for an ion-bombarded polymeric hybrid surface through focused ion beam (FIB) technology. The PDE is theoretically explored by introducing a positive diffusion term into the classic theory. The conductivity-induced PDE constant is discussed as functions of substrates conductivity, ion energy and flux. The theoretical results agree well with the experiential results on the conductivity-induced PDE, and thus yield good control over roughness and patterning milling depth on the fabricated surface. Moreover, we demonstrate a controllable surface wettability in hydrophobic and superhydrophobic surfaces (contact angles (CA) range from 108.3° to 150.8°) with different CA hysteresis values ranging from 31.4° to 8.3°.

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