基于软印刷技术的竹材表面仿制荷叶超疏水结构

The super-hydrophobic structure of lotus leaf generated on the bamboo surface based on soft lithography

利用软印刷技术,研究了在竹材表面仿制荷叶表面的超疏水性微纳结构。以新鲜荷叶为模板,以聚二甲基硅氧烷(PDMS)为印章,经过两次复形处理使竹材表面获得类似荷叶表面的超疏水结构。扫描电子显微镜(SEM)观测及接触角测试结果表明,制备的仿生荷叶竹材样品具有与荷叶类似的微纳乳突结构粗糙表面,其与水滴的接触角达到150.5°(平均值),非常接近荷叶表面的接触角(154.5°),表现出超疏水特性。仿生荷叶微纳结构竹材样品的成功制备,证实了纳米技术赋予竹材等亲水材料以超疏水性能的可行性。

The super-hydrophobic micro-nano structure of the lotus leaf is generated on bamboo surfaces by soft lithography. The superhydrophobic structure created on the bamboo surfaces is similar to that of the lotus leaf after twice replication, with fresh lotus leaves as the template and the polydimethylsiloxane（PDMS） as the seal. The results of the scanning electron microscopy（SEM） and the water contact angle（WCA） measurements show that the prepared bionic lotus-leaf bamboo samples enjoy lotus-leaf-like micro-nano papillary rough surfaces. The WCA is 150.5°（the average value）, very close to that of lotus leaf surfaces（154.5°）, displaying a super-hydrophobic property.The successful preparation of the bionic lotus leaf micro-nano structure samples confirms the feasibility that a super-hydrophobic surface on bamboo and other hydrophilic materials could be achieved with the nano-technology.