Ultrathin Antifouling Coatings with Stable Surface Zwitterionic Functionality by Initiated Chemical Vapor Deposition (iCVD)
Ultrathin Antifouling Coatings with Stable Surface Zwitterionic Functionality by Initiated Chemical Vapor Deposition (iCVD)
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DOI：
10.1021/la302059s
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发表时间：
2012-08-21
期刊：
影响因子：
3.9
通讯作者：
Gleason, Karen K.
中科院分区：
文献类型：
--
作者：
Yang, Rong;Gleason, Karen K.
采用不依赖底物的全干引发化学气相沉积（iCVD）技术，与1,3-丙烷磺酮进行限扩散气相反应，合成了聚[N，N-二甲基-N-甲基丙烯氧氧乙基-N-（3-磺丙基）-co-2-（二甲氨基）甲基丙烯酸乙酯-共乙二醇二甲基丙烯酸酯]（PDDE）防污薄膜。通过石英晶体微天平耗散监测（QCM-D）测量，涂层表面对包括牛血清白蛋白（BSA）、腐植酸（HA）和海藻酸钠（SA）在内的各种污染物的吸收非常低。腐植酸的污染依赖于Ca2+等二价阳离子的存在。深度分析和角度分辨x射线光电子能谱（XPS）测量结果表明，两性离子基团高度集中在膜的顶部，约为3nm。接触角测量表明，接触水后表面链重组程度有限。在空气中存放100天后，动态接触角保持不变，表明界面的稳定性。该涂层与基材无关，薄膜在纳米结构表面（包括沟槽、反渗透膜和静电纺纳米纤维垫）呈保形分布。
Antifouling thin films of poly[N,N-dimethyl-N-methacryloxyethyl-N-(3-sulfopropyl)-co-2-(dimethylamino)ethyl methacrylate-co-ethylene glycol dimethacrylate] (PDDE) were synthesized via a substrate-independent and all-dry-initiated chemical vapor deposition (iCVD) technique followed by a diffusion-limited vapor-phase reaction with 1,3-propane sultone. Coated surfaces exhibited very low absorption of various foulants including bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA), as measured with the quartz crystal microbalance with dissipation monitoring (QCM-D). The fouling by humic acid was dependent on the presence of divalent cations such as Ca2+. Both depth profiling and angle-resolved X-ray photoelectron spectroscopy (XPS) measurements indicated that the zwitterionic groups were highly concentrated in the top similar to 3 nm of the film. The contact angle measurements revealed a limited degree of surface chain reorganization upon contacting water. The dynamic contact angles remained unchanged after 100 days of storage in air, indicating the stability of the interface. The coating was substrate-independent, and the film was conformal on surface nanostructures including trenches, reverse osmosis membranes, and electrospun nanofiber mats.