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周东山,教授
 

Email: dzhou@nju.edu.cn

Tel: 86 025 83686136

 

周东山 教授

Prof.  Dongshan Zhou

2010-present                Professor, Department of Polymer Science and Engineering, Nanjing University

2005-2010                    Associate Professor, Department of Polymer Science and Engineering, Nanjing University

2003-2005                    Postdoc, Department of Physics, Department of Chemistry, Nanjing University

2006-2008                    Humboldt Research Fellow, Institute of Physics, Rostock University, Germany

2000-2003                    PhD, Department of Polymer Science and Engineering, Nanjing University

1997-2000                    MS, Department of Earth Science, Nanjing University

1993-1997                    BS, Department of Chemical Engineering, Nanjing University

周东山       教授,博士生导师。1974年生。分别于1997年、2000年和2003年在南京大学化工系、地球科学系和高分子科学与工程系获得本科、硕士博士学位。2003-2005年在南京大学物理系、化学系从事博士后研究工作,2005年起受聘为高分子系副教授,2006-2008年受洪堡基金会资助在德国Rostock大学物理研究所从事研究工作,2009年开始担博士生导师,2010年晋升为教授。曾于2005年获得全国百篇优秀博士学位论文(导师为薛奇教授)。目前的研究方向为:高分子构象转变、相变和玻璃化转变;高速高灵敏量热学,受限态亚稳态材料性质。

Research Interests

Instrumental Development in Fast Scanning and Sensitive Calorimetry

Fast heating or cooling treatment is one of the most routinely used techniques to prepare advanced functional materials in metastable states. Depending on the rates of crystallization or polymorphism transition, the corresponding heating or cooling rates to capture the wanted metastable states can span from few K/s to 107 K/s. Calorimeters with ultrafast temperature scanning rates are highly desired to follow and control these fast structural evolutions. And additionally, the sensitivity of calorimeter, that is proportional to the temperature scanning rate, is also increased down to levels sub-nano J/K, making direct measurements on ultrathin film possible.

In this lab, we successfully build the ultrafast scanning and sensitive calorimeter with scanning rates up to 105 K/s, short response time down to sub-milliseconds and sensitivity down to 50 pico J/K.

in-situ Integration of Fast Scanning Calorimeter with Structural Analysis Techniques

Thermally analysis alone in some cases is not enough to provide the full description of the phase and structural evolution, so we integrate the fast scanning calorimeter with the micro-structural analysis techniques, say, micro-Raman scattering spectroscopy.

Melting behaviors with fast enough heating rate provides the growing crystallinity during annealing, while Raman spectroscopy provides the information regarding the chain conformation transition during crystallization. We can find that both techniques provide the consistent crystallization kinetics.

 

Metastable States and Confined System

With the fast scanning calorimeter, we can capture transient polymorphs of small molecules that are very unstable in ambient temperature even though they were obtained under demanding conditions. For example, the square plate form of liquid crystal forming molecule 8OCB, was found in very limited temperature and time window when it was grown from glassy liquid crystalline states [Soft Matter 2013, 9, 1488].

Glass transition of polymers confined into ultrathin film has been intensively studied owning to polymer thin films’ increasing important applications in high-tech devices, and as the model system for the study of size effect on the glass transition itself. With this sensitive calorimeter, we have successfully measured the glass transition of polymer thin films down to few nanometers [Macromolecules 2008, 41, 7662; 2013, 46, 7006].

Selected Publications

1.   Thickness Dependence of Glass Transitions Measured by AC-Chip Calorimetry in Films with Controlled Interface, Jiao Chen, Jie Xu, Xiaoliang Wang, Dongshan Zhou*, Pingchuan Sun, Gi Xue*, Macromolecules 2013, 46, (17), 7006-7011.

2.   A transient polymorph transition of 4-cyano-4 '-octyloxybiphenyl (8OCB) revealed by ultrafast differential scanning calorimetry (UFDSC), Jing Jiang, Evgeny Zhuravlev, Zijie Huang, Lai Wei, Qin Xu, Meijuan Shan, Gi Xue, Dongshan Zhou*, Christoph Schick*, Wei Jiang*, Soft Matter 2013, 9, (5), 1488-1491.

3.   Thermo-reversible gelation of atactic poly(methyl methacrylate) in poly(ethylene glycol) oligomers, Yun Gao, Chunhong Yu, Minzhi Chen, Xiaoliang Wang, Dongshan Zhou*, Gi Xue*, Eur. Phys. J. E 2013, 36, 37.

4.   Tracking the interdiffusion of polymers at a molecular level by H-1 dipolar filter solid-state NMR under fast magic angle spinning, Qiang Gu, Xiaoliang Wang, Pingchuan Sun, Dongshan Zhou*, Gi Xue*, Soft Matter 2011, 7, (2), 691-697.

5.   Verifying the symmetry of ultra-fast scanning calorimeters using liquid crystal secondary temperature standards, Minzhi Chen, Muting Du, Jing Jiang, Dawei Li, Wei Jiang, Evgeny Zhuravlev, Dongshan Zhou*, Christoph Schick*, Gi Xue*, Thermochim. Acta 2011, 526, (1-2), 58-64.

6.   Calorimetric study of blend miscibility of polymers confined in ultra-thin films, Wei Jiang, Muting Du, Qiang Gu, Jing Jiang, Heiko Huth, Dongshan Zhou*, Gi Xue*, Christoph Schick*, Eur. Phys. J.-Spec. Top. 2010, 189, (1), 187-195.



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