猪笼草蜡质滑移区表面反粘附特性的研究  

Anti-adhesion Mechanisms of Nepenthes Waxy Slippery Zone Surface

作　　者：毕可东[1,2] 宋小闯 王玉娟[1,2] 杨决宽[1,2] 陈云飞[1,2] 

机构地区：[1]东南大学机械工程学院,南京211189 [2]东南大学江苏省微纳生物医疗器械设计与制造重点实验室,南京211189

出　　处：《机械工程学报》2015年第23期103-109,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51345012)

摘　　要：利用环境扫描电子显微镜(ESEM)和原子力显微镜(AFM)表征红瓶猪笼草蜡质滑移区表面微观形貌,并提取粗糙度的相关参数。利用AFM分别在低载荷和高载荷下对蜡质区表面同一区域进行扫描,在不同条件下的扫描形貌一致,且扫描后的探针针尖上未发现附着污染物。利用胶体探针技术在无针尖的探针悬臂上粘附15μm SiO_2小球,模拟单根刚毛与猪笼草蜡质区表面的接触,并测试蜡质区表面的粘附力和摩擦力,并与不同粗糙度的抛光纸表面做对照。考虑到表面物理化学性质对其粘附特性的重要影响,利用接触角测量仪测量蜡质区表面和同粗糙度范围抛光纸表面对水和二碘甲烷的表观接触角并利用二滴法计算其表面能。研究结果表明:蜡质滑移区表面单个蜡质晶体具有力学稳定性,不会因脱落而污染昆虫的粘附器官,污染学说不成立;表面微粗糙度能有效地减小界面间的接触面积,降低了蜡质滑移区表面的粘附力和摩擦力;蜡质滑移区超疏水特性和低表面能是降低表面粘附力和摩擦力的另一个重要因素,两者共同作用形成了猪笼草蜡质滑移区的反粘附特性。The micro-topography and geometrical parameters of the surface of nepenthes waxy slippery zone are characterized by atomic force microscope （AFM） and environment scanning electron microscope （ESEM）. An individual domain of the waxy slippery zone surface is scanned by AFM with different normal forces applied, showing no difference in the topography and without pollutant adhering to the probe tip after scanning. Colloidal probe, which is made by gluing a 15 μn silica sphere onto the probe cantilever equipped with no tips, is employed to behave as a single seta contacting with the surface of nepenthes waxy slippery zone. Adhesion and friction forces of the waxy zone surface are measured anti compared with those of polishing papers. Considering the effect of surface physicochemical properties on its adhesion ability, contact angles of polar （water） and non-polar （diiodomethane） liquids on the waxy zone surface and polishing papers with a similar roughness are measured by contact angle measuring device. The results show that a single crystal of waxy zone is of the mechanical stability, thus disclaiming the contamination hypothesis. The contact area at the interface can be reduced efficiently by the surface roughness of waxy zone, which, to some extent, decreases its adhesion and friction forces, The super-hydrophobic property and low surface energy of the waxy zone, combined with each other to form an anti-adhesion effect on the nepenthes waxy slippery zone, are another factor in reducing the surface adhesion and friction forces.

关 键 词：猪笼草 反粘附 粗糙度 超疏水 低表面能 

分 类 号：TG156[金属学及工艺—热处理]