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汪 蓉,教授
 

Email: wangrong@nju.edu.cn

Tel: 0086-025-83596802

汪蓉 教授

Prof. Rong Wang

2013.01-present        Professor at Nanjing University, School of Chemistry and Chemical Engineering

2003.11-2012.12        Associate Professor at Nanjing University, School of Chemistry and Chemical Engineering

2009.06-08, 2011.06-08  Humboldt Research Fellow at Johannes Gutenberg-Universität Mainz, Institut für Physics

2006.10-2008.2         Research Fellow at National University of Singapore, Singapore-MIT Alliance

2001.8-2003.7          Post-doctor Fellow at Fudan University, Department of Macromolecular Science 

1998.9-2001.6          Sichuan University, Institute of Atomic and Molecular Physics

汪蓉 教授,博士生导师。20016月毕业于四川大学获博士学位,20019月至20037月在复旦大学高分子科学系做博士后研究,200311月到南京大学工作,200610月至20082月在新加坡国立大学从事访问研究。20096-8月和20116-8月受洪堡基金资助到德国Mainz大学做访问研究。研究兴趣主要集中于嵌段共聚高分子的自组装、具有生物相容性的两亲性高分子的自组装行为以及具有特殊功能的高分子复合材料。

Research Interests

1. Self-assembly of Block Copolymers

Self-assembly spontaneously creates structures or patterns with a significant order parameter out of disordered components. Of these self-assembly materials, block copolymer is an important one. Block copolymers can self-assembly into ordered patterns in nano scale. The morphologies and the phase diagram of comb copolymer Am+1(BC)m are investigated by the self-consistent field theory. By changing the volume fractions of the blocks, the interaction parameters between the different blocks and the side chain number, nine phases were found, including many structure-in-structure morphologies. The side chain number m affects the phase diagram largely due to the fact that the architecture of a comb copolymer is not invariant under the interchange between the three different monomers. Due to the connectivity of the blocks B and the inner blocks A, Am+1(BC)m comb copolymers with the longer main chain A or longer side chain with short block C, i.e. longer block B, are difficult to phase separate.

 

2. Vesicle Formation Pathways of Amphiphilic Block Copolymers

Vesicles and membrane properties play critical roles in reproducing the natural environment of living cells such as nutrient transport and DNA protection. We report how to control the morphology evolutionary stages of the self-assembly of amphiphilic block copolymers composed of hydrophilic-hydrophobic- hydrophilic structure using dissipative particle dynamics method. Two unique intermediate states are obtained by controlling the hydrophobic/hydrophilic block ratio, polymer-solvent interaction, and polymer concentration. Additionally, during the transition period between these two pathways, vesicles are formed through an in-between pathway. A crucial balance between the segregation of inner-hydrophobic beads and the attraction of outer-hydrophilic beads drastically affects the self-assembly pathways of amphiphilic block copolymer into vesicles from one mechanism over the other.

 

3. Crowding Effect Induced Phase Transition

In the microstructure formation of amphiphilic block copolymer, the solvent plays an important role. The aggregate concentration of the amphiphilic AB diblock copolymer decreases in solution with larger solvent size. The phase will transit in solution with different solvent size due to the excluded volume interaction effect. This widely existing excluded volume effect is very useful for the separation of polymers and helpful for understanding the crowding effect in bio-molecules.

 

Selected Publications

1.     Hetero-structure of ABC triblock copolymer thin film on Polymer-coated Substrate, Rong Wang*, Shanning Zhang, Yudong Qiu, Polymer, 2011 52(2), 586-592.

2.     Excluded volume effect on the self-assembly of amphiphilic AB diblock copolymer in dilute solution, Rong Wang, Zhibin Jiang, Gi Xue, Polymer, 201152(10)2361-2365.

3.     Disorder-to-order transition of triblock comb copolymer Am+1(BC)m, Zhiyuan Qian, Rong Wang*, Macromolecules, 2011, 44, 6113–6120.

4.     Stretching of free chains confined in concave brush-coated nanocylinders, Rong Wang, Sergei A. Egorov, Andrey Milchev, and Kurt Binder, Macromolecules, 201245 (5), 2580–2587.

5.     Controlling the self-assembly pathways of amphiphilic block copolymers into vesicles, Mengying Xiao, Guangjie Xia, Rong Wang*, Daiqian Xie*, Soft Matter, 2012, 8, 7865-7874.

6.    Biomimetic membrane control of block copolymer vesicles with tunable wall thickness, Mengying Xiao, Jiannan Liu, Jiexin Yang, Rong Wang*, Daiqian Xie*, Soft Matter, 2013,9, 2434-2442.

 



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