Synthetic Chemistry Lab., Kawamura Institute of Chemical Research, 631 Sakado, Sakura 285-0078, Japan.
Langmuir. 2011 May 17;27(10):6338-48. doi: 10.1021/la2004547. Epub 2011 Apr 14.
The formation of silica films on the glass plate whose surface was precoated by crystalline linear poly(ethylenimine) (LPEI) in advance was systematically investigated via controlling the surface-specific crystallization of the LPEI on the glass plate. Immersing glass substrates into a hot aqueous solution of LPEI containing additives such as transition metal ions and acidic compounds and retaining them on 30 °C for desired periods resulted in the formation of crystalline LPEI layers on the substrates. Subsequently dipping this LPEI-coated glass into silica source solutions afforded successfully hierarchically structured silica film which coated continuously the surface of the substrates. In this two-step process, we found that the formation of hierarchically structured silica films strongly depended on the LPEI layer formed from the LPEI aqueous solutions containing different additives. The LPEI layer formed by changing the kinds of additives and their concentrations provides the differently structured silica films composed of turbine-like structures flatly lying-on and/or vertically standing-on as well as ribbon network structures on the surface of the substrates. Moreover, we functionalized these silica films by the introduction of hydrophobic alkyl chains or emissive Eu(III) complexes and investigated their wettability and emission properties.
通过控制线性结晶聚乙烯亚胺（LPEI）在玻璃表面的特异性结晶，系统地研究了玻璃片上预先涂覆结晶线性聚乙烯亚胺（LPEI）的硅酮薄膜的形成。将玻璃基板浸入含有添加剂（如过渡金属离子和酸性化合物）的 LPEI 水溶液中，并在 30°C 下保持所需时间，可在基板上形成结晶 LPEI 层。随后将涂覆 LPEI 的玻璃基板浸入硅源溶液中，成功地制备了连续覆盖基板表面的分层结构硅酮薄膜。在这两步过程中，我们发现分层结构硅酮薄膜的形成强烈依赖于含有不同添加剂的 LPEI 水溶液形成的 LPEI 层。通过改变添加剂的种类和浓度形成的 LPEI 层提供了不同结构的硅酮薄膜，这些薄膜由涡轮状结构、平坦地放置和/或垂直地放置以及基板表面上的带状网络结构组成。此外，我们通过引入疏水性烷基链或发光 Eu（III）配合物对这些硅酮薄膜进行了功能化，并研究了它们的润湿性和发光性能。
