Polymer and Composites Division, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Zhenhai District, Ningbo, Zhejiang Province, 315201, P. R. China.
Macromol Rapid Commun. 2012 Feb 13;33(3):218-24. doi: 10.1002/marc.201100638. Epub 2011 Dec 20.
A facile route to reassemble titania nanoparticles within the titania-block copolymer composite films has been developed. The titania nanoparticles templated by the amphiphilic block copolymer of poly(styrene)-block-poly (ethylene oxide) (PS-b-PEO) were frozen in the continuous PS matrix. Upon UV exposure, the PS matrix was partially degraded, allowing the titania nanoparticles to rearrange into chain-like networks exhibiting a closer packing. The local structures of the Titania chain-like networks were investigated by both AFM and SEM; the lateral structures and vertical structures of the films were studied by GISAXS and X-ray reflectivity respectively. Both the image analysis and X-ray scattering characterization prove the reassembly of the titania nanoparticles after UV exposure. The mechanism of the nanoparticle assembly is discussed.
已开发出一种在二氧化钛-嵌段共聚物复合薄膜内重新组装二氧化钛纳米粒子的简易途径。由两亲嵌段共聚物聚苯乙烯-嵌段-聚氧化乙烯（PS-b-PEO）模板化的二氧化钛纳米粒子被冷冻在连续的 PS 基质中。在紫外光照射下，PS 基质部分降解，允许二氧化钛纳米粒子重新排列成链状网络，表现出更紧密的堆积。通过原子力显微镜（AFM）和扫描电子显微镜（SEM）研究了二氧化钛链状网络的局部结构；通过 GISAXS 和 X 射线反射率分别研究了薄膜的横向结构和垂直结构。图像分析和 X 射线散射特性均证明了紫外光照射后二氧化钛纳米粒子的重新组装。讨论了纳米粒子组装的机制。
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