Schmidt Bernhard V K J, Elbert Johannes, Scheid Daniel, Hawker Craig J, Klinger Daniel, Gallei Markus
Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States.
Ernst-Berl Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss Str. 4, 64287 Darmstadt, Germany.
ACS Macro Lett. 2015 Jul 21;4(7):731-735. doi: 10.1021/acsmacrolett.5b00350. Epub 2015 Jun 24.
The formation of nanostructured shape anisotropic nanoparticles from poly(ferrocenylsilane)--poly(2-vinylpyridine) (PFS--P2VP) block copolymers is presented. Ellipsoidal particles with an axially stacked lamellar structure and nanosheets with a hexagonal structure of PFS cylinders are obtained under neutral wetting conditions through the use of a mixed surfactant system during self-assembly. In contrast to traditional systems, the resulting particle structure is strongly influenced by crystallization of the PFS domains under colloidal confinement with lamella-forming PFS--P2VP block copolymers leading to cylindrical morphologies. A blending approach was developed to control this morphological change and by the addition of PFS homopolymers, ellipsoidal particles with a lamellar structure could also be obtained. Ultimately, the spatial control over two orthogonal functionalities was exploited to demonstrate morphology transitions for nanosheets upon the exposure to methanol as solvent for P2VP and FeCl as a redox stimulus, opening up a variety of applications in the field of stimuli-responsive materials.
本文介绍了由聚（二茂铁基硅烷）-聚（2-乙烯基吡啶）（PFS-P2VP）嵌段共聚物形成纳米结构形状各向异性纳米颗粒的过程。在中性润湿条件下，通过在自组装过程中使用混合表面活性剂体系，获得了具有轴向堆叠层状结构的椭球形颗粒和具有PFS圆柱体六边形结构的纳米片。与传统体系不同，所得颗粒结构受到胶体限制下PFS域结晶的强烈影响，形成层状的PFS-P2VP嵌段共聚物导致圆柱形形态。开发了一种共混方法来控制这种形态变化，通过添加PFS均聚物，也可以获得具有层状结构的椭球形颗粒。最终，利用对两种正交功能的空间控制，证明了纳米片在暴露于作为P2VP溶剂的甲醇和作为氧化还原刺激物的FeCl时的形态转变，为刺激响应材料领域开辟了多种应用。
