Yuan W
Department of Materials Science & Engineering, University of Cincinnati, Cincinnati, Ohio, 45221-0012
J Colloid Interface Sci. 1997 Jan 1;185(1):197-209. doi: 10.1006/jcis.1996.4604.
Organofunctional silane films formed on pure zinc substrates from aqueous solutions were characterized by ellipsometry, contact angle measurements, reflection absorption infrared spectroscopy (RAIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The silanes studied were gamma-aminopropyltriethoxysilane (gamma-APS) and gamma-ureidopropyltrialkoxysilane (gamma-UPS). The deposition parameters included solution concentration, solution dipping time, and pH value of the applied solution. Effects of these deposition variables on the thickness of the film, the surface energy of the film, the chemical structure of the film, and the surface topography of the film are discussed. The effect of film aging time on the surface energy of silane-coated pure zinc substrates was also studied. It was found that the silane film thickness obtained depends primarily on the applied solution concentration and is independent of the solution dipping time. The molecular orientations of the applied silane film are determined by the pH value of the applied silane solution and the isoelectric point of the metal substrates. The deposition window in terms of pH value for zinc substrates was between 6 and 9. The total surface energy of silane-coated pure zinc substrate decreases steeply with film aging time for gamma-APS but not for gamma-UPS. The stability of both silane films improved after aging in the air.
通过椭偏仪、接触角测量、反射吸收红外光谱（RAIR）、X射线光电子能谱（XPS）和原子力显微镜（AFM）对在纯锌基底上由水溶液形成的有机官能硅烷膜进行了表征。所研究的硅烷为γ-氨丙基三乙氧基硅烷（γ-APS）和γ-脲丙基三烷氧基硅烷（γ-UPS）。沉积参数包括溶液浓度、溶液浸渍时间和所施加溶液的pH值。讨论了这些沉积变量对膜厚度、膜表面能、膜化学结构和膜表面形貌的影响。还研究了膜老化时间对硅烷涂层纯锌基底表面能的影响。发现所获得的硅烷膜厚度主要取决于所施加的溶液浓度，而与溶液浸渍时间无关。所施加硅烷膜的分子取向由所施加硅烷溶液的pH值和金属基底的等电点决定。锌基底在pH值方面的沉积窗口在6至9之间。对于γ-APS，硅烷涂层纯锌基底的总表面能随膜老化时间急剧下降，而对于γ-UPS则不然。两种硅烷膜在空气中老化后稳定性均有所提高。
