学术报告：Nano- and Micro-structured Materials: From Microfluidics to Self-assembly
学术报告：Nano- and Micro-structured Materials: From Microfluidics to Self-assembly报告题目：Nano- and Micro-structured Materials: From Microfluidics to Self-assembly
报告人：Prof. Zhihong Nie
―――Department of Chemistry and Biochemistry， University of Maryland at College Park, MD
报告时间：2010年10月27日（周三）上午10：00
报告地点：嘉定学术活动中心307房间
This talk will focus on the development of new strategies for the preparation of micro- and nano-structured polymer materials. First of all, I will introduce a versatile method to synthesize polymeric microparticles with extremely high control over their dimensions, shapes, compositions, and morphologies[1-4]. The method includes (i) the emulsification of monomers in a microfluidic flow-focusing device and (ii) in-situ solidification of droplets via photopolymerization, thermal gelation or ionic crosslinking. This powerful approach offers extraordinary research opportunities in material science, biomedicine, and cell biology and has a broad range of applications, such as in the encapsulation of drugs, and in coating, separation, and catalyst technologies.
In addition, I will present a new approach to the self-assembly of inorganic nanoparticles by taking lessons from polymers [5,6]. For the prototype system, we used hydrophilic gold nanorods carrying hydrophobic polystyrene molecules at both ends, which resembled amphiphilic block copolymers. By changing the solvent quality, the polymer-tethered nanorods self-assembled into a wide range of hierarchical structures, such as chains, rings, and vesicles, in a controllable and predictable manner. We further discovered a striking similarity between the self-assembly of metal nanoparticles and reaction-controlled step-growth polymerization [7]. The assembly of nanoparticles in a well-organized manner allows the best exploitation of the unique collective optical, electronic, and magnetic properties of individual nanoparticles, and is vital for their utilization in optoelectronics, sensing, and biomedical applications[8].
Selected references
[1] Nie, Z.H., Xu, S.Q., et al. J. Am. Chem. Soc. 2005, 127, 8058.
[2] Nie, Z.H., Li, W., et al. J. Am. Chem. Soc. 2006, 128, 9408.
[3] Nie, Z.H., Park, J. I., et al. J. Am. Chem. Soc. 2008, 130, 16508.
[4] Park, J.I., Nie, Z.H. et al. Angew. Chem. Int. Ed. 2009, 48, 5300.
[5] Nie, Z.H., Fava, D., et al. Nature Mater. 2007, 6, 609.
[6] Nie, Z.H., Fava, D., et al. J. Am. Chem. Soc. 2008, 130, 3683.
[7] Liu, K., Nie, Z. H., et al. Science, 2010, 329, 197-200
[8] Nie, Z.H., A. Petukhova, et al. Nat. Nanotech. 2010, 5, 15-25
报告人简历
EDUCATION
2003 – 2008 Ph. D. in Polymer and Materials Chemistry (University of Toronto, Canada)
2000 – 2003 M. Sc. in Polymer Physics and Chemistry (CIAC, Chinese Academy of Sciences)
1996 – 2000 B. Eng. in Polymer Materials and Engineering (Jilin University)
PROFESSIONAL EXPERIENCES
2008 – 2010 NSERC Postdoctoral Fellow, Harvard University, Cambridge, MA
Supervisor: Prof. George M. Whitesides
Projects: low-cost medical diagnostics, soft robotics
欢迎大家参加！！
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