Notice: This lecture is a research seminar for credit.
Time
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Mar 22, 2019 10:00-11:00 a.m.
Abstract
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Molecular and colloidal self-assembly has been recognized as an important “bottom-up” approach to constructing functional materials and self-organized systems for various applications. An understanding of the self-assembly pathways is significant for designing routes to the desired structures and the emergence of novel properties. However, it remains a great challenge to unveil the hidden pathways and translate states during self-assembly due to the difficulty of in situ characterizations, especially in complex hierarchical and/or multi-component systems. In this talk, we report our developments on in situ characterization methods and their effectiveness in revealing the hidden pathways during molecular and colloidal self-assembly. For instances, using in situ combined spectroscopies, we elucidate the transient structures during the self-assembly of organic cages and provide deep insights into the chiral amplification in multi-component supramolecular systems. Through a variety of in situ studies on molecular assembly, we discover and establish a new assembly mode that we name catalyzed assembly (catassembly) for its resemblance to catalysis. Finally, we highlight our discovery of the dynamic deformation of individual PbSe nanocrystals during colloidal assembly into superlattice through in-situ liquid-phase TEM. We show an unprecedented phenomenon that inorganic semiconductors are “soft materials” at the nanoscale. The discoveryis significant not only for the designing of nanocrystals and nanocrystal architectures with desired properties for various applications, but also for controlling the physical and chemical processes of a wide range of matter at the atomic or nanometric level.
Speaker's Bio
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Dr. Yu Wang obtained his B.Sc. degree from the department of intensive institution at Nanjing University in 2009, and his Ph.D. degree from the department of chemistry at Xiamen University in 2016. From May 2016 to Aug 2017, he was a post-doc researcher at the University of Akron. Since Aug 2017, he works as post-doc in the department of materials science and engineering at University of California, Berkeley. He is interested in self-assembled materials, nanotechnology and in situ characterizations. His research focuses on developing controllable assembly methods to construct (hierarchical) nanomaterials from small molecules, macromolecules, and nanocrystals and exploring their emergent properties in chemistry and physics. He has published 15 research papers. In recent five years, as the first or corresponding author he has published 9 papers on high-impact journals such as Nature Commun. (three times), Chem. Soc. Rev., and J. Am. Chem. Soc.
Registration
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Professors and students of TBSI are welcometo attend. The lecture is also open to the public. For off-campuspersonnel, please scan the QR code and and fill in your information (name,company, contact number, ID number). The language of the lecture isEnglish.
