Synthesis of transparent superhydrophobic polyethylene surfaces
Synthesis of transparent superhydrophobic polyethylene surfaces
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DOI：
10.1016/j.surfcoat.2005.06.022
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发表时间：
2006-05-08
影响因子：
5.4
通讯作者：
Poncin-Epaillard, F
中科院分区：
文献类型：
--
作者：
Fresnais, J;Chapel, JP;Poncin-Epaillard, F
超疏水表面，已经存在于自然界中，如在植物（莲花）的叶子或一些鸟类的羽毛中观察到的，对应于水接触角高于150度的疏水表面。在进行这种表面的合成之前，必须理解相应的现象并定义相关的特征。大多数已经开发的技术导致表面具有弱的物理性质，如光学和机械性质。在这里，提出了在干燥介质（等离子体）中的合成，导致稳定和透明的聚合物超疏水表面。有两种途径是可能的;第一个步骤对应于一步合成（低密度聚乙烯（LDPE）的CF 4等离子体改性），第二个步骤对应于两个步骤（O-2等离子体处理，然后在LDPE上进行CF 4等离子体处理）。O-2等离子体允许产生可变的粗糙度，而CF 4等离子体强调这种粗糙度并产生非极性层。通过两步处理，几个等离子体参数被发现阐述稳定的透明的超疏水表面具有可控的粗糙度，其化学结构接近于聚四氟乙烯的结构。它已被证明，超疏水表面可以获得，即使具有低的粗糙度，约20 nm。(c)2005年由Elsevier B. V.出版
Superhydrophobic surfaces, already present in the nature as observed with leaves of plants (lotus) or feathers of some birds, correspond to hydrophobic surface whose water contact angle is higher than 150 degrees. Before running the synthesis of such surface, one must understand the corresponding phenomenon and define the pertinent characteristics. Most of the techniques already developed lead to surfaces with weak physical properties such as optical and mechanical ones. Here, the synthesis in dry medium (plasma) is proposed leading to stable and transparent polymeric superhydrophobic surfaces. Two routes are possible; the first one corresponds to the one-step synthesis (CF4 plasma modification of low density polyethylene (LDPE)), the second one to the two steps (O-2 plasma treatment followed by CF4 plasma onto LDPE).The plasma parameters are defined to optimize the degradation and/or the functionalization and the obtained surface structures are characterized. The O-2 plasma allows to create a variable roughness while CF4 plasma emphasizes this roughness and creates the apolar layer. By the two-step treatments, several plasma parameters were found to elaborate stable transparent superhydrophobic surfaces with a controlled roughness and whose chemical structure is close to a Teflon-like structure. It has been shown that superhydrophobic surface can be obtained even with a low roughness, around 20 nm. (c) 2005 Published by Elsevier B.V.