Chang Y. Ryu
— Assistant Professor of Chemistry,
Rensselaer Polytechnic Institute

— B.S., Chemical Technology, (with honors), Seoul National University, Korea, 1990
— M.S., Chemical Technology, Seoul National University, Korea, 1992
— Ph.D., Chemical Engineering, University of Minnesota, 1998

Career Highlights:
Ryu spent a year working as a research associate for the Korea Institute of Science and Technology. Upon earning his Ph.D. from the University of Minnesota, Ryu served as a postdoctoral researcher for the University of California at Santa Barbara for nearly two years. He joined Rensselaer in late 2000 as an assistant professor of chemistry. His honors and awards include the Mettler-Toledo Thermal Analysis Education Grant in 2001, the Arthur K. Doolittle Award from the American Chemical Society's (ACM) Division of Polymeric Materials Science and Engineering (PMSE) in 1998, and a Korea Foundation for Advanced Studies Scholarship from 1993 through 1998.

Research Interests:
Ryu leads an NSEC Seed Grant project entitled, "Synthesis and HPLC Separation of ABC Three-Arm Star Block Copolymers." He also serves as a director for Rensselaer's centralized polymer thermal characterization facility, and offers interdisciplinary training for students and researchers in chemistry, chemical engineering, and materials.

Ryu is researching synthesis and characterization of heterogeneous polymers such as polymer blends and block polymers, and polymer-carbon nanotube hybrid materials. He is studying structure-property relationships of multiphase polymer systems, where their performance and applications are closely related to the mesoscopic morphologies. Ryu is working to develop a synthesis protocol that allows researchers to design and manufacture the model polymers and is also considering the application of these techniques to solve industrially relevant problems. He aims to guide the rational design of polymeric materials, thus gaining a fundamental understanding in the correlation between properties and structures in multiphase polymers.

He is also interested in developing carbon nanotubes (wires) imbedded in insulating polymer sheath by the synthesis of polymer-carbon nanotube hybrid materials. Polymer grafted nanotubes could result in a "cylinders-in-cylinders" morphology and can be subsequently aligned or "pulled" on a large scale by applying shear, electric field, or magnetic field. These nanotube-containing copolymers will have potential applications in high-resolution flat screen display. Possible applications as structural reinforcements in composite materials for microelectromechanical systems (MEMS) applications are also of interest, because the grafted polymer chains improve the adhesion between stiff nanotubes and polymer matrix.

Selected Publications:
Yang, H.; Shin, T. J.; Yang, L.; Cho, K. W.; Ryu, C. Y.; Bao, Z. "Effect of Mesoscale Crystalline Structure on Field-Effect Mobility of Regioregular Poly(3-hexyl thiophene) in Thin Film Transistors," Adv. Function. Mat., 15, (4), 671-676, (2005).

Yang, X. W.; Hua, F. J.; Yamato, K.; Ruckenstein, E.; Gong, B.; Kim, W.; Ryu, C. Y. "Supramolecular AB diblock copolymers," Angew. Chem.-Int. Edit., 43, 6471-6474, (2004).

Han, J. T.; Lee, D. H.; Ryu, C. Y.; Cho, K. W., "Fabrication of superhydrophobic surface from a supramolecular organosilane with quadruple hydrogen bonding," J. Am. Chem. Soc., 126, 4796-4797, (2004).

Park, S.; Park, I. ; Chang, T.; Ryu, C. Y. "Interaction-controlled HPLC for block copolymer analysis and separation," J. Am. Chem. Soc. , 126, 8906-8907 (2004).

Lastella, S.; Jung, Y. J.; Yang, H. C.; Vajtai, R.; Ajayan, P. M.*; Ryu, C. Y.*; Rider, D. A.; Manners, I., "Density control of single-walled carbon nanotubes using patterned iron nanoparticle catalysts derived from phase-separated thin films of a polyferrocene block copolymer," J. Mater. Chem., 14, 1791-1794, (2004).

Cho, J. H.; Lee, D. H.; Shin, H. S.; Pattanayek, S. K.; Ryu, C. Y.; Cho, K.*, "Exploiting Poly(dimethylsiloxane)-Modified Tips To Evaluate Frictional Behavior by Friction Force Microscopy," Langmuir, 20, 11499-11503, (2004).

Viswanathan, G.; Chakrapani, N.; Yang, H.C.; Wei, B. Q.; Chung, H. S.; Cho, K. W.; Ryu, C. Y.*; Ajayan, P. M.*, "Single-step in situ synthesis of polymer-grafted single-wall nanotube composites," J. Am. Chem. Soc. , 125, (31), 9258-9259, (2003).

Lahiff E, Ryu CY, Curran S, Minett AI, Blau WJ, Ajayan PM*, "Selective positioning and density control of nanotubes within a polymer thin film, " Nano Letters, 3, (10), 1333-1337 (2003).

Contact Information:
Chang Y. Ryu
Department of Chemistry
205 Cogswell
Rensselaer Polytechnic Institute
110 Eighth Street
Troy, N.Y. 12180 USA
(518) 276-2060


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