箴言
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在科学上没有平坦的大道,只有那些不畏艰险沿着陡峭山路攀登的人,才有希望达到光辉的顶点。
----马克思
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合作研究
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请有兴趣的研究组联系我们。欢迎任何形式的合作,尤其是在自组装、水凝胶以及生物医药等方向的合作。
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研究成果
18. Hierarchical Structure and Polymorphism of a Sphere-Cubic Shape Amphiphile of Polyhedral Oligomeric Silsesquioxane-C60 Conjugate. J. Mater. Chem. 2011, 37, 14240-14247
发布时间:2016-04-26
Sun, H.-J.; Tu, Y.;* Wang, C.-L.; Van Horn, R. M.; Tsai, C.-C.; Graham, M. J.; Sun, B.; Lotz, B.; Zhang, W.-B.;* Cheng, S. Z. D.* Hierarchical Structure and Polymorphism of a Sphere-Cubic Shape Amphiphile of Polyhedral Oligomeric Silsesquioxane-C60 Conjugate. J. Mater. Chem. 2011, 37, 14240-14247. [Link] [PDF]
Abstract
A shape amphiphile composed of covalently linked spherical and cubic nanoparticles with distinct symmetry ([60]fullerene (C60) and polyhedral oligomeric silsesquioxane (POSS)) was synthesized and its solid state structures were characterized. The two types of nanoparticles are known to be generally immiscible, but they were connected with a short covalent linkage forming an organic–inorganic dyad (POSS–C60) which exhibited interesting crystallization characteristics. Crystals of the dyad exhibited polymorphism with two different crystal structures: an orthorhombic and a hexagonal unit cell with symmetry groups of P21212 and P6, respectively, both of which formed an alternating bi-layered structure of POSS and C60. The different symmetry groups in the polymorphs were attributed to the different packing orientations of the POSS within each layer. In the orthorhombic unit cell, one set of the edges of the POSS moieties is parallel to the c-axis; while in the hexagonal unit cells the body-diagonal is parallel to the c-axis of the crystal. Based on the crystal packing structure and density differential, it has been determined that the hexagonal unit cell structure is the more thermodynamically stable phase. This type of bi-layered structure with an alternating conductive fullerene and insulating POSS layer structure is of great interest for various potential applications such as nano-capacitors.