Hierarchical patterning by multi-step micro-imprinting with layered materials
Dept. of Mech. Eng., Kyushu Univ., 744 Motooka, Nishi-ku, Fukuoka
2 Dept. of Mech. Eng., Grad. School of Eng., Kyushu Univ., 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Accepted: 24 February 2015
The objective of the work reported in this paper is to create multi-scale and hierarchical surface structures using a simple imprinting process. The hierarchical structures can be fabricated with only simple patterned molds by proposed multi-step imprinting process, instead of using a high cost hierarchical-patterned mold. In the proposed process, the starting material is a layered sheet material. The layered sheet is pressed by a mold with a finer pattern, and subsequently pressed by a mold with a rougher pattern. A pure polymer sheet is employed as the upper layer, which will be removed during heating processes as a sacrificed layer, while the lower layer is a compound material of polymer and ceramic powder. After heating process, ceramic compact is sintered and formed a full-dense patterned sheet. By the proposed multi-step imprinting process with a layered material, ceramic sheets with micro hierarchical pattern can be fabricated with low cost. In the present work, poly(vinyl alcohol) (PVA) was prepared as the upper layer, and a compound material of alumina powder and PVA as a lower layer. Molds with finer and rougher patterns were also prepared for multi-step imprinting. As a result, a hierarchical structure on a thin ceramic sheet could be fabricated.
Key words: Imprint / Ceramics / Hydrophobic surface / Multi-scale patterning / Bio mimicry
© F. Tsumori et al., Published by EDP Sciences, 2015
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