人造玫瑰花花瓣的微结构分布与水滴黏附性质的关系  

Effects of the Distribution of Micropapillae with Nanofolds on the Adhesive Property of Artificial Red Rose Petals

作　　者：王景明[1] 王春[1] 王明超[1] 江雷[1,2] 

机构地区：[1]北京航空航天大学化学与环境学院,北京100191 [2]中国科学院化学研究所北京分子科学国家实验室,北京100190

出　　处：《高等学校化学学报》2011年第8期1807-1811,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20901006);中央高校基本业务科研费专项资金(批准号:YWF-10-01-B16)资助

摘　　要：采用模板印刷法制得了具有玫瑰花花瓣结构的聚二甲基硅氧烷(PDMS)薄膜,通过对该薄膜逐级拉伸改变了微观结构的分布;采用环境扫描电镜(ESEM)观察了不同拉伸程度下薄膜表面微观结构的变化,采用高敏感性微电力学天平测试了样品表面微观结构变化过程中水滴的黏附力,分析了微观结构分布与水滴黏附性质的关系;采用接触角测量仪表征了不同拉伸程度下薄膜的浸润性.实验结果表明,随着PDMS薄膜被逐次拉伸,单位面积内玫瑰花花瓣乳突的数目减少,纳米褶皱面积不断增加,而纳米级褶皱结构尺寸随着拉伸基本上不发生变化,直到样品破坏;与微观结构变化相对应的,该表面对水滴的黏附力先增大后减小,直到该表面彻底破坏.由此可见,微米结构及纳米结构的分布是影响玫瑰花花瓣对水滴黏附的主要因素.Many biological organism surfaces exhibit amazing characters.An intriguing example is the red rose petal,which is famous of its ＂petal effect＂（i.e.the water droplet adhesion effect）.Numerous studies have revealed that these interesting characters of the biological surfaces are attributed to their special wettabilities with the combination of unusual micro-and nano-hierarchical structures and chemical composition.In this article,the ＂petal effect＂ was reproduced on an ＂artificial red rose petal＂——a superhydrophobic PDMS film with the same hierarchical rough structures of red rose petals.The surface adhesive effect was characterized by the high-sensitivity microelectromechanical balance system,and the effects of micro-and nano-structure on the adhesive property of ＂artificial red rose petal＂ was investigated by altering the stretch stage.The morphology of the ＂artificial red rose petal＂ at different stages were observed by environmental scanning electron microscope（ESEM）,and the wettability was characterized by the apparent contact angle.The experimental results show that surface hydrophobicity can be enhanced by the nano-scaled structure and the high adhesive force is mainly caused by the micro-and nano-scaled structure.It is believed that this work will provide us a new avenue to further understand the wettablilty of solid surface and to design novel microfluidic devices in a wide range of applications.

关 键 词：人造玫瑰花花瓣 表面黏附力 拉伸 微米结构 纳米结构 

分 类 号：O647[理学—物理化学]