Carnegie Mellon University

Guojun Xie

Guojun Xie

Graduate Student

Address
Carnegie Mellon University
4400 Fifth Avenue
Mellon Institute
Pittsburgh, PA 15213

Bio

 

Education

Ph. D., Chemistry, Carnegie Mellon University, Pittsburgh, U.S. (GPA: 4.05/4.00)  08/2013-06/2018(expected)
B. S., Chemistry, Peking University, Beijing, P.R. China (GPA: 3.55/4.00)              09/2009-07/2013

Research

Ph.D. Candidate, with Prof. Krzysztof Matyjaszewski, Dept. of Chemistry, Carnegie Mellon University, Pittsburgh, US

Synthesis and characterization of complex polymeric architectures               08/2013-present

  • Designed the chemical structures and synthetic strategies of novel polymeric materials for various application including surfactants, lubricants, (ultra)soft elastomer, porous materials and templates for nanoparticles
  • Optimized conditions for atom transfer radical polymerization (ATRP) via kinetic studies
  • Performed multi-step syntheses through application of various polymerization techniques and post-polymerization modification methods to achieve targeted materials
  • Evaluated the structures and properties of synthesized polymeric using various characterization techniques in inter-department and inter-university collaborations
  • Extracted and rationalized the structure-property relations in materials based on analysis of experimental results

Research assistant, with Prof. Yuguo Ma, College of Chemistry, Peking University, Beijing, China 

Developed heterobimetallic olefin polymerization phenoxy-imine catalysts        09/2012-06/2013

  • Synthesized phenoxy-imine ligands with structural diversity for studying and tuning the property of catalysts
  • Tested the performance of catalysts by polymerization procedures and polymer characterization

Research assistant, with Prof. Jianbo Wang, College of Chemistry, Peking University, Beijing, China

Studied transition-metal-catalyzed isomerization of cyclopropene derivatives            09/2010-08/2012

  • Synthesized organic substrates with different functional groups to test the functional group tolerance

Publications

  • Xie, G.; Pawel, K.; Tilton, R. D.; Matyjaszewski, K. "Heterografted Molecular Brushes as Stabilizers for Water-in-Oil Emulsions" Macromolecules 2017, 50 (7), 2942-2950.
  • Xie, G.; Ding, H.; Daniel, W. F. M.; Wang, Z.; Pietrasik, J.; Sheiko, S. S.; Matyjaszewski, K., "Preparation of titania nanoparticles with tunable anisotropy and branched structures from core–shell molecular bottlebrushes". Polymer 2016, 98, 481-486.
  • Daniel, W. F. M.; Xie, G.; Vatankhah Varnoosfaderani, M.; Burdyńska, J.; Li, Q.; Nykypanchuk, D.; Gang, O.; Matyjaszewski, K.; Sheiko, S. S., "Bottlebrush-Guided Polymer Crystallization Resulting in Supersoft and Reversibly Moldable Physical Networks". Macromolecules 2017, 50 (5), 2103-2111.
  • Wang, Z.; Pan, X.; Yan, J.; Dadashi-Silab, S.; Xie, G.; Zhang, J.; Wang, Z.; Xia, H.; Matyjaszewski, K., "Temporal Control in Mechanically Controlled Atom Transfer Radical Polymerization Using Low ppm of Cu Catalyst". ACS Macro Letters 2017, 6 (5), 546-549.
  • Yuan, R.; Kopeć, M.; Xie, G.; Gottlieb, E.; Mohin, J. W.; Wang, Z.; Lamson, M.; Kowalewski, T.; Matyjaszewski, K. "Mesoporous Nitrogen-doped Carbons from PAN-based Molecular Bottlebrushes" Polymer accepted
  • Faivre, J.; Shrestha, B. R.; Burdynska, J.; Xie, G.; Moldovan, F.; Delair, T.; Benayoun, S.; David, L.; Matyjaszewski, K.; Banquy, X., "Wear Protection without Surface Modification Using a Synergistic Mixture of Molecular Brushes and Linear Polymers". ACS Nano 2017, 11 (2), 1762-1769.
  • Song, Y.; Ye, G.; Wang, Z.; Kopeć, M.; Xie, G.; Yuan, R.; Chen, J.; Kowalewski, T.; Wang, J.; Matyjaszewski, K., "Controlled Preparation of Well-Defined Mesoporous Carbon/Polymer Hybrids via Surface-Initiated ICAR ATRP with a High Dilution Strategy Assisted by Facile Polydopamine Chemistry". Macromolecules 2016, 49 (23), 8943-8950.
  • Ding, H.; Yan, J.; Wang, Z.; Xie, G.; Mahoney, C.; Ferebee, R.; Zhong, M.; Daniel, W. F. M.; Pietrasik, J.; Sheiko, S. S.; Bettinger, C. J.; Bockstaller, M. R.; Matyjaszewski, K., "Preparation of ZnO hybrid nanoparticles by ATRP". Polymer 2016, 107, 492-502.
  • Wang, G.; Schmitt, M.; Wang, Z.; Lee, B.; Pan, X.; Fu, L.; Yan, J.; Li, S.; Xie, G.; Bockstaller, M. R.; Matyjaszewski, K., "Polymerization-Induced Self-Assembly (PISA) Using ICAR ATRP at Low Catalyst Concentration". Macromolecules 2016, 49 (22), 8605-8615.
  • Yan, J.; Kristufek, T.; Schmitt, M.; Wang, Z.; Xie, G.; Dang, A.; Hui, C. M.; Pietrasik, J.; Bockstaller, M. R.; Matyjaszewski, K., "Matrix-free Particle Brush System with Bimodal Molecular Weight Distribution Prepared by SI-ATRP". Macromolecules 2015, 48 (22), 8208-8218.
  • Burdyńska, J.; Xie, G.; Li, Y.; Robertson, B.; Acosta, E.; Matyjaszewski, K.; Sheiko, S. “Molecular Bottlebrushes with bimodal side chain length” Poster session presented at: the 248th ACS National Meeting and Exposition; 2014, August 10-14; San Francisco, California.
  • Zhang, H.; Li, C.; Xie, G.; Wang, B.; Zhang, Y.; Wang, J., "Zn(II)- or Rh(I)-Catalyzed Rearrangement of Silylated [1,1′-Bi(cyclopropan)]-2′-en-1-ols". J. Org. Chem. 2014, 79 (13), 6286-6293.
  • Zhang, H.; Wang, B.; Wang, K.; Xie, G.; Li, C.; Zhang, Y.; Wang, J., "Pd-Catalyzed ring-opening cross-coupling of cyclopropenes with aryl iodides". Chem. Commun. 2014, 50 (59), 8050-8052.

Leadership and Activities

 Manager of GPC-related instruments, Matyjaszewski Group, Carnegie Mellon Univ.  10/2013-present

  • Lead the maintenance team of 3 to ensure the proper operations of all 4 GPC systems which analyzes more than 500 samples each month by monitoring instrument parameters, trouble shooting and replacing consumable parts
  • Leaded GPC-related instrumental upgrade within the research group by proposing the purchase plan cost up to 200K dollars, negotiating with suppliers to minimizing the cost-effectiveness ratio of purchased instruments and assembled 6 new GPC analytical systems.
  • Regulated the large volume of GPC analysis in a research group with more than 25 members via setting users' rules, providing user training and coordination between users
  • Attended bi-weekly meeting of manager committee to discuss potential safety issues and solutions

 President, United Network of Peking University for Alumni Abroad, Peking Univ.   10/2010-06/2013

  • Established and maintained sustainable relationship with over 300 alumni in the United Network of Peking University for Alumni Abroad
  • Hosted annual banquet for 200 plus students who just graduated from Peking University and would continue their studies abroad each year

Technical Skills

  • Characterization techniques: Nuclear Magnetic Resonance (NMR), Gel Permeation Chromatography (GPC/SEC), Dynamic Light Scattering (DLS), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), UV-Vis Spectroscopy, Dynamic Mechanical Analysis (DMA), atom force microscope (AFM), Tensiometer.
  • Computer skill: Microsoft Office Suite, Origin, MATLAB, ChemBioDraw, LaTeX, Python