Three-dimensional observation of confined phase-separated structures in block copolymer nanoparticles
Three-dimensional observation of confined phase-separated structures in block copolymer nanoparticles
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DOI：
10.1039/c2sm07139h
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发表时间：
2012-01-01
期刊：
影响因子：
3.4
通讯作者：
Shimomura, Masatsugu
中科院分区：
文献类型：
--
作者：
Higuchi, Takeshi;Motoyoshi, Kiwamu;Shimomura, Masatsugu
研究了纳米粒子作为三维约束体系，约束对二嵌段共聚物微相分离结构的影响。我们成功地用简单的溶剂蒸发法从疏水二嵌段共聚物中制备了具有各种复杂结构的纳米粒子。通过透射电子显微断层扫描（tem）对纳米颗粒进行了详细的三维结构分析，发现复杂结构仅在纳米颗粒表面区域形成，其厚度与块体状态下嵌段共聚物的单分子长度相对应。这些结果表明，三维约束从根本上影响嵌段共聚物的自组装，在纳米颗粒的表面区域最强烈，而在中心区域则较弱。
The effect of confinement on microphase-separated structures of a diblock copolymer is investigated in nanoparticles serving as a three-dimensional (3D) confinement system. We succeeded in preparing nanoparticles having various types of complex structures from hydrophobic diblock copolymers by a simple solvent evaporation method. The detailed 3D structural analysis of the nanoparticles by transmission electron microtomography (TEMT) revealed that complex structures were found only to form in the nanoparticle surface region, the thickness of which corresponded to the single-molecule length of the block copolymer in the bulk state. These results indicate that 3D confinement fundamentally affects block copolymer self-assemblies most strongly in the surface region of nanoparticles but only weakly in the central region.