Abstract
It is well known that the microstructures of solid surfaces greatly affect the states of liquids in contact. Here, as a simple model system of the microstructures, we focus on buckling-based self-organized wrinkle structures and show the various phenomena and states of liquids on the wrinkles. Since the typical wrinkles have a shallow sinusoidal shape as the cross section, they are not suitable to induce the super-hydrophobicity and super-hydrophilicity, which are usually based on structures with a high-aspect ratio, for example, needles. Although most of such highly structured surfaces are not transformable, our wrinkles are shape-tunable, in which the wrinkle groove depth or orientation can be altered by simply adjusting the applied strain to the sample. Using this shape-tunability, the capillary phenomena of liquids on wrinkle grooves can be controlled. The basic physics of this phenomenon is discussed in terms of the balance between interfacial energies related to the stability of the liquid shapes. Thus, a general condition for the capillary action on sinusoidal grooves has been obtained and supported by experiments, in which the effects of depth of the grooves and contact angles are evaluated. As examples of further application based on this phenomenon, micro-patterning methods are shown such as directed polymer phase separation on grooves, gold nano-ribbon formation on liquid filaments, and novel periodic pattern formations in liquid crystals confined in the grooves.
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Acknowledgements
This work was partly supported by the New Energy and Industrial Technology Development Organization (NEDO) of Japan under the Industrial Technology Research Grant Program in 2008. The author thanks H. Monobe, Y. Shimizu, H. Yokoyama, M. Yoneya, J. Fukuda, N. Fukuda, M. Fujiwara, Y. Takenaka, H. Kitahata, K. Suzuki, M. Fujiwara, R. Yamaguchi, and T. Yamaguchi for their helpful comments, theoretical and experimental support.
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Ohzono, T. (2018). Liquids on Shape-Tunable Wrinkles. In: Hozumi, A., Jiang, L., Lee, H., Shimomura, M. (eds) Stimuli-Responsive Dewetting/Wetting Smart Surfaces and Interfaces. Biologically-Inspired Systems, vol 11. Springer, Cham. https://doi.org/10.1007/978-3-319-92654-4_6
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