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论文类型：会议论文

发表时间：2009-07-08

收录刊物：EI、CPCI-S、Scopus

卷号：7493

关键字：ice templating; assembly of nanoparticles; particle-fiber; smart composite material; sophisticated mirostructure

摘要：An investigation was performed to develop a facile route, named as ice templating, for large scale of three-dimensional assembling of polystyrene nanoparticles. The organic nanoparticles were assembled into a macroscopic subject with sophisticated three-dimensional microstructure, induced by growing ice crystals in freezing process of particle suspension. By controlling freezing direction, freezing rate, and particle concentration in suspension, various interesting microstructures were prepared, including three-dimensional connected porous lamellas, bundles of ribbons, and fibers with uniform diameter (similar to 1.5 mu m), high aspect ratio, and same orientation. Freezing direction is the key factor to control the assembling direction of particles, while, freezing rate and particle concentration are important parameters which affect morphology and size of microstructures. On the other hand, the route of ice templating has many advantages, including environmental friendly, low cost, high output and universality. Other materials, such as metal and semiconductor nanoparticles, could also be used in our platform for preparation of smart materials and structures. It is anticipated that by this simple approach, various functional nanoparticles would be efficiently assembled into macroscopic subject with sophisticated microstructures which offer synergistic, optimized properties of individual zero-dimensional elements, and hence, the derived composite materials or structures could implement desired functions with better performance.