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美国工程院院士程正迪教授学术报告(2016-10-19)

( 2016-10-18 )
 
 The University of Akron 的 Stephen Z. D. Cheng (程正迪,美国工程院院士)教授将到访科大并做学术报告,具体安排如下:
报告题目:Precisely Functionalized Molecular Nanoparticles Are Unique Elements for Macromolecular Science: From “Nanoatoms” to Giant Molecules 
报告时间:10月19日(周三)上午10:00
报告地点:环资楼一楼学术报告厅
 
 

 
 
Precisely Functionalized Molecular Nanoparticles Are Unique Elements for Macromolecular Science: From “Nanoatoms” to Giant Molecules

Stephen Z. D. Cheng

Department of Polymer Science, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH 44325-3909, U.S.A.

In this talk, we present a unique approach to the design and synthesis of “giant molecules” based on “nano-atoms” for engineering structures across different length scales and controlling their macroscopic properties. Herein, “nano-atoms” refer to shape-persistent molecular nanoparticles (MNPs) with precisely-defined chemical structures and surface functionalities that can serve as elemental building blocks for the precision synthesis of “giant molecules” by methods such as a sequential click approach and other efficient organic transformations. Typical “nano-atoms” include those based on fullerenes, polyhedral oligomeric silsesquioxanes, polyoxometalates, and folded globular proteins. The resulting “giant molecules” are precisely-defined macromolecules. They include, but are not limited to, giant surfactants, giant shape amphiphiles, and giant polyhedra. Giant surfactants are composed of “nano-atoms” tethered with flexible polymer tails of various compositions and architectures at specific sites that have drastic chemical differences such as amphiphilicity. Giant shape amphiphiles are built up by covalently-bonded molecular segments with distinct shapes where the self-assembly is driven by the shape of the molecular segment as well as the chemical interaction. Giant polyhedra are either made of a large MNP or by deliberately placing “nano-atoms” at the vertices of a polyhedron. Giant molecules capture the essential structural features of their small-molecule counterparts in many ways but possess much larger sizes; therefore, they are recognized in some cases as size-amplified versions of those counterparts and often, they bridge the gap between small-molecules and traditional macromolecules. Highly diverse, sometime completely unexpected, thermodynamically stable and metastable hierarchal structures are commonly observed in the bulk, thin-film, and solution states of these giant molecules. Controlled structural variations by precision synthesis further reveal a remarkable sensitivity of their self-assembled structures to the primary chemical structures. Unconventional nanostructures can be obtained in confined environments or through directed self-assembly. All the results demonstrate that MNPs are unique elements for macromolecular science, providing a versatile platform for engineering nanostructures that are not only scientifically intriguing, but also technologically relevant.
 

 
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