奈米級仿生黏著科技

在本篇論文中，成功的利用電子束微影技術和化學氣相層積製造奈米級仿生黏著層，壁虎的腳上有很多高密度的角質奈米纖毛，使得它可以在光滑或是粗糙的表面上行走，實驗中成功地利用高分子光阻材料和奈米碳管製造出高密度的纖毛，並且利用原子力顯微鏡和特別的探針作為量測吸附力的設備，利用光阻奈米纖毛分析其吸附力和纖毛半徑、密度、數量和產生凡得瓦力實際面積的相互關係，而奈米碳管所產生的黏著力已經和壁虎的腳毛黏著力到了同一個等級了。而對於壁虎腳毛的自我清潔功能也做了驗證，壁虎腳毛之所以如此斥水的原因在於奈米等級的間隙，使得空氣保留在間隙中，水無法陷入間隙，產生較大的水滴接觸角，使得水可以輕易的將附著於表面的灰塵微粒帶走，而造成自我清潔效應。

關鍵字

壁虎；仿生；奈米；吸附；黏著；自我潔淨

並列摘要

This work presents the fabrication and characterization of nano-fibrils mimicking gecko foot-hairs for enhanced dry adhesion. High contact area ratio of the polymer and carbon nanotube fibrils is achieved, respectively, using e-beam lithography and chemical vapor deposition. The adhesion forces from gecko foot-hairs and the artificial fibrils are measured with a customized AFM tip to evaluate the effects of different materials, surface density, the number of fibrils and the area of real contact. With the water-vapor assisted deposition, the surface density of the carbon nanotubes is optimized for comparable adhesion forces to gecko foot-hairs. Although the photoresist and the CNT are both intrinsically hydrophilic, superhydrophobic behavior was obtained when they were patterned or synthesized into nano-fibrils.

並列關鍵字

gecko ； biomimetic ； nanotechnology ； adhesives ； self-cleaning

參考文獻

[1] A.B. Kesel, A. Martin, and T. Seidl, “Adhesion measurements on the attachment devices of the jumping spider evarcha arcuata,” J. Experimental Biology, vol. 26, pp. 2733-2738, 2003.

[2] E. Arzt, S. Gorb, and R. Spolenak, “From micro to nano contacts in biological attachment devices,” PNAS, vol. 100, no. 9, pp. 10603-10606, 2003.

[3] H. Gao and H. Yao, “Shape insensitive optimal adhesion of nanoscale fibrillar structures,” PNAS, vol. 101, no. 21, pp. 7851-7856, 2004.

[5] D.J. Irschick et al., “A comparative analysis of clinging ability among pad-bearing lizards,” Biological J. Linnean Society, vol. 59, pp. 21-35, 1996.

[6] R. Ruibal and V. Ernst, “The structure of digital setae of lizards,” J. Morphology, vol. 117, pp. 271-294, 1965.

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奈米級仿生黏著科技

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