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报告题目 |
Colloidal Superparticles: A New Frontier of Nanomaterials |
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报告时间 |
2012年12月17日下午3:00 |
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报告地点 |
合肥微尺度物质科学国家实验室一楼科技展厅 |
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摘要 |
Colloidal superparticles are nanoparticle assemblies in the form of colloidal particles. Assembling nanoscopic objects into meso/macroscopic complex architectures allows bottom-up fabrication of functional materials, which is essential for many nanomaterial-based technological applications. In this seminar, we will discuss the formation of superparticles with supercrystalline structures made from the self-assembly of nanoparticles with a verity of chemical compositions and with well-defined size and shapes. We will show that the self-assembly of CdSe/CdS core/shell semiconductor nanorods, mediated by shape and structural anisotropy, producesmesoscopiccolloidal superparticles having multiplewell-defined supercrystalline domains.Further, functionality-based anisotropic interactions between these CdSe/CdS nanorods can be kinetically introduced during the self-assembly and in turn yield single-domain, needle-like superparticles having parallel alignment of constituent nanorods. Unidirectional patterning of these mesoscopic needle-like superparticles gives rise to the lateral alignment of CdSe/CdS nanorods into macroscopic, uniform, freestanding polymer films that exhibit strong photoluminescence with a striking anisotropy, enabling their use as down-conversion phosphors to create polarized light-emitting diodes. |
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报告人 |
Prof. Y. Charles Cao Department of Chemistry, University of Florida, Gainesville, FL 32611, USA. |
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报告人简介：⑴现在工作单位及职称 ⑵主要研究方向 ⑶学术成就简述（100字以内） Dr. Charles Cao is a tenured associate professor in the Department of Chemistry at the University of Florida. He received his BSc (1990), MSc (1993), and PhD degrees (1996) from Jilin University in Changchun. He then worked as a postdoctorial fellow in the Institute of Photographic Chemistry of the Chinese Academy of Sciences, the Hebrew University of Jerusalem, and the Northwestern University at Evanston, before he joined the faculty of the Department of Chemistry at the University of Florida in 2003. His research interests focus on the science of nanomaterials. His work seeks todevelop methodologies for controlling the surface and interior structures of materials at the nanometer scale, for better understanding the thermodynamic and quantum mechanical properties of these materials and for using them in technology applications. Dr. Cao has published over 60 papers in highly regarded research journals, including Nature, Science, the Proceeding of National Academy of Sciences, the Journal of the American Chemical Society, and Angewandte Chemie. He was a guest editor for special issues of two international journals on the topic of nanomedicine. His accomplishments have been recognized with an NSF Career Award and covered in several highlight articles in Chemical Engineering News, Science, and many popular magazines, newspapers and trade journals. His research program is sponsored by the National Science Foundation, Office of Naval Research, and Department of Energy. | |
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接待单位联系人：俞书宏 电话：3603040 | |
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主办单位：微尺度国家实验室，化学与材料科学学院，研究生院 | |