报告人：Prof. Zhan Chen （Department of Chemistry,
University of Michigan, Ann Arbor, Michigan 48109, US）
题 目：Molecular Structures
of Buried Polymer/Liquid and Polymer/Solid Interfaces
时 间：2017年5月5日下午4:00
地 点：南开大学 蒙民伟楼 201
报告简介：
Understanding molecular
surface/interface structures of polymers and biomolecules is important for many
applications and processes, such as biomaterial design, anti-biofouling
control, bio-adhesion, biosensing, modern micro- and nano-electronic devices,
nano-imprinting, and blood coagulation. However, it is difficult to examine
polymer and biological interfaces due to the lack of appropriate techniques.
Most surface sensitive techniques require high vacuum to operate and cannot provide
molecular structural information. In many cases, polymer and biological
molecules need to be studied in situ, e.g., at solid/liquid interfaces. Prof.
Chen’s group has developed systematic methodologies to examine molecular
structures of complex surfaces and interfaces in situ in real time using
state-of-the-art sum frequency generation (SFG) vibrational spectroscopy,
supplemented by other techniques, such as Fourier transform infrared
spectroscopy (FTIR), FTIR-attenuated total reflection (FTIR-ATR) spectroscopy,
contact angle goniometry, Raman scattering, circular dichroism spectroscopy and
fluorescence spectroscopy. We applied such methodologies to elucidate molecular
structures of many important surfaces and interfaces, greatly impacting many
research areas in analytical chemistry, physical chemistry, biochemistry,
chemical biology, materials chemistry, environmental chemistry, medicinal
chemistry, surface and interfacial science, biophysics, molecular spectroscopy,
and macromolecular science and engineering. Currently we are investigating
surface immobilized peptides for antimicrobial coatings, surface immobilized
enzymes for biosensing, antifouling polymer coatings, membrane peptides and
proteins, nanomaterial-cell interactions, buried interfaces in solar cells and
batteries, and polymer adhesion. We are also developing instrumentation and
data analysis methodology for vibrational spectroscopic and nonlinear optical
spectroscopic
methods.
1. Effect of Interfacial Molecular Orientation on Power Conversion Efficiency
of Perovskite Solar Cells, J. Am. Chem. Soc., 2017, 139, 3378.
2. An Engineered Surface-immobilized Enzyme that Retains High Levels of
Catalytic Activity in Air, J. Am. Chem. Soc., 2017, 139, 2972.
3. Molecular Interactions between Graphene and Biological Molecules, J. Am.
Chem. Soc., 2017, 139, 1928.
4. Engineering and Characterization of Peptides and Proteins at Surfaces and
Interfaces: A Case Study in Surface-Sensitive Vibrational Spectroscopy, Acc.
Chem. Res., 2016, 49, 1149.
5. Probing Site-specific Structural Information of Peptides at Model Membrane
Interface in Situ, J. Am. Chem. Soc., 2015, 137, 10190
