北京化工大学孙晓明教授12月31日下午学术报告

发布时间:2014-12-29访问量:109设置

报告人:孙晓明教授

北京化工大学

 

题目:功能纳米颗粒的密度梯度离心分离与纯化/Separation and purification of functional nanoparticles by density gradient untracentrifugation

时间:20141231日(星期三)下午3:00pm

地点:独墅湖校区909号楼一楼B会议室

 

摘要:

Nanoseparation is attracting more and more interest as an important and effective complementary process to synthesis optimization for providing strictly monodisperse nanoparticles (NPs) for investigations of their size- or shape-dependent properties and assembly into superstructures or elaborate nanodevices. Here we adopted "density gradient ultracentrifuge separation" (DGUS) method for separation of polydisperse colloids to obtain more monodisperse or unique colloidal fractions. DGUS method was demonstrated a general method not only for sorting nanoparticles with different size and morphology but also applicable for various materials, such as noble metal, carbon, S-group semiconductor, or hydroxide compounds etc. Meanwhile, DGUS separation can be carried out in both aqueous and organic media. Combined with two insoluable solvents, DGUS method could even act as a hyperconcentration or hyperpurification technique for colloidal nanoparticles when centrifuging them through water/oil interfaces. Models were set up for typical systems for separation optimization. A series of nano-effects were observed or evidenced on these fractions as property investigations were performed, which provided chance to get deeper view into the structure-property relationship of colloidal nanoparticles. More importantly, nanoseparation demonstrated to us that the formation of nanoparticles with varied sizes or morphologies in one batch is not a random behavior; in contrast, they are closely related to synthetic parameters, properties of fractions, and composition distribution. The findings provide new inspirations for synthesis optimization. Furthermore, DGUS method could also be applied as an efficient analysis tool for investigation of reaction intermediate, assembly mechanisms and other quick reactions. Finally, DGUS have now been developed as a complete fabrication system for constructing monodisperse highly ordered assemblies.

 

个人简介:

19762月生,19952005年在清华大学理学院学习并先后获得学士博士学位(导师:李亚栋院士),2005 2008 在美国斯坦福(Stanford)大学做博士后,20083月开始任北京化工大学教授,博士生导师,曾任研究生院副院长。2004年获清华大学特等奖学金,2007年获全国百篇优秀博士论文2008年入选新世纪人才计划2011年获国家杰出青年基金资助。

主要从事无机功能材纳米料研究,在无机功能纳米结构的控制合成、表面改性与光电性能等方面取得系列有显著创新性和应用价值的成果。主持的科研项目包括国家杰出青年基金项目1项、国家“973”计划课题2项、国家自然科学基金2项。已在J. Am. Chem. Soc. (2)Angew. Chem. Int. Ed. (4) Adv. Mater.(2), ACS Nano(2), Nano Res., Chem. Eur. J. 等国际顶级学术期刊上以第一作者及通讯联系人发表论文70余篇,他引3800余次,单篇最高引用680次。获国家发明专利授权6项;申请国际专利2项。

 

联络人:张桥教授

 

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