Rui Yuan
Carnegie Mellon University
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Publication
Featured researches published by Rui Yuan.
Journal of the American Chemical Society | 2017
Jianan Zhang; Yang Song; Maciej Kopeć; Jaejun Lee; Zongyu Wang; Siyuan Liu; Jiajun Yan; Rui Yuan; Tomasz Kowalewski; Michael R. Bockstaller; Krzysztof Matyjaszewski
An aqueous-based approach for the scalable synthesis of nitrogen-doped porous carbons with high specific surface area (SSA) and high nitrogen content is presented. Low molecular weight polyacrylonitrile (PAN) is solubilized in water in the presence of ZnCl2 that also acts as a volatile porogen during PAN pyrolysis to form mesoporous structures with significantly increased SSA. By templating with commercial SiO2 nanoparticles, nanocellulose fillers or filter paper, nanocarbons with SSA = 1776, 1366, and 1501 m2/g, respectively and 10 wt % N content were prepared. The materials formed by this benign process showed excellent catalytic activity in oxygen reduction reaction via the four-electron mechanism.
ACS Applied Materials & Interfaces | 2017
Jianan Zhang; Rui Yuan; Sittichai Natesakhawat; Zongyu Wang; Yepin Zhao; Jiajun Yan; Siyuan Liu; Jaejun Lee; Danli Luo; Eric Gottlieb; Tomasz Kowalewski; Michael R. Bockstaller; Krzysztof Matyjaszewski
Functional nanoporous carbon spheres (NPC-S) are important for applications ranging from adsorption, catalysis, separation to energy storage, and biomedicine. The development of effective NPC-S materials has been hindered by the fusion of particles during the pyrolytic process that results in agglomerated materials with reduced activity. Herein, we present a process that enables the scalable synthesis of dispersed NPC-S materials by coating sacrificial protective layers around polyacrylonitrile nanoparticles (PAN NPs) to prevent interparticle cross-linking during carbonization. In a first step, PAN NPs are synthesized using miniemulsion polymerization, followed by grafting of 3-(triethoxysilyl)propyl methacrylate (TESPMA) to form well-defined core-shell structured PAN@PTESPMA nanospheres. The cross-linked PTESPMA brush layer suppresses cross-linking reactions during carbonization. Uniform NPC-S exhibiting diameters of ∼100 nm, with relatively high accessible surface area (∼424 m2/g), and high nitrogen content (14.8 wt %) was obtained. When compared to a regular nanoporous carbon monolith (NPC-M), the nitrogen-doped NPC-S demonstrated better performance for CO2 capture with a higher CO2/N2 selectivity, an increased efficiency in catalytic oxygen reduction reactions, as well as improved electrochemical capacitive behavior. This miniemulsion polymerization-based strategy for the preparation of functional PAN NPs provides a new, facile approach to prepare high-performance porous carbon spheres for diverse applications.
Macromolecules | 2016
Yang Song; Gang Ye; Zongyu Wang; Maciej Kopeć; Guojun Xie; Rui Yuan; Jing Chen; Tomasz Kowalewski; Jianchen Wang; Krzysztof Matyjaszewski
Macromolecules | 2017
Maciej Kopeć; Rui Yuan; Eric Gottlieb; Carlos M. R. Abreu; Yang Song; Zongyu Wang; Jorge F. J. Coelho; Krzysztof Matyjaszewski; Tomasz Kowalewski
Macromolecules | 2016
Maciej Kopeć; Pawel Krys; Rui Yuan; Krzysztof Matyjaszewski
Polymer | 2017
Rui Yuan; Maciej Kopeć; Guojun Xie; Eric Gottlieb; Jacob Mohin; Zongyu Wang; Melissa Lamson; Tomasz Kowalewski; Krzysztof Matyjaszewski
Polymer | 2017
Guowei Wang; Zongyu Wang; Bong-Joon Lee; Rui Yuan; Zhao Lu; Jiajun Yan; Xiangcheng Pan; Yang Song; Michael R. Bockstaller; Krzysztof Matyjaszewski
Macromolecules | 2018
Julia Cuthbert; Antoine Beziau; Eric Gottlieb; Liye Fu; Rui Yuan; Anna C. Balazs; Tomasz Kowalewski; Krzysztof Matyjaszewski
ACS Applied Nano Materials | 2018
Yang Song; Guoyu Wei; Maciej Kopeć; Linfeng Rao; Zhicheng Zhang; Eric Gottlieb; Zongyu Wang; Rui Yuan; Gang Ye; Jianchen Wang; Tomasz Kowalewski; Krzysztof Matyjaszewski
Chemistry of Materials | 2018
Jianan Zhang; Yang Song; Yepin Zhao; Shuo Zhao; Jiajun Yan; Jaejun Lee; Zongyu Wang; Siyuan Liu; Rui Yuan; Danli Luo; Maciej Kopeć; Eric Gottlieb; Tomasz Kowalewski; Krzysztof Matyjaszewski; Michael R. Bockstaller