Carnegie Mellon University Department of Chemistry
photo of Hyung J. Kim

Hyung J. Kim

Professor

Carnegie Mellon University

email:

Phone: (412) 268-6489

Fax: (412) 268-1061

Office: Mellon Institute 512

ORCID: 0000-0003-4334-1879
ResearcherID: S-3066-2016

group website

Faculty & Research

Hyung J. Kim

Professor

Research Areas

Theoretical and computational chemistry, equilibrium and nonequilibrium statistical mechanics, computer simulations, chemical reactions and spectroscopy in solution, green solvents, supercapacitors, multi-domain proteins

Solvation and chemical reactions in green solvents

Most chemical reactions occur in a solution environment, which alters significantly free energies and dynamics (and sometimes reaction mechanisms) of reaction systems through short-range and Coulombic interactions, compared to the gas phase. A classic example is solvolysis of halo-alkanes. Their SN1 kinetics become accelerated by many orders of magnitude in solvents like water, compared to the elimination pathway in the gas-phase pyrolysis. Therefore the influence of dissolution, commonly referred to as “solvation effect”, is critical to understanding kinetics (e.g., rate constant) and thermodynamics (e.g., equilibrium constant) of solution-phase reactions. By employing analytic theory and modern computational techniques, we study solvation effects in homogeneous (i.e., bulk solvent) and heterogeneous (e.g., interface and nano-confinement) environments. Our primary focus is on chemical reactions involving charge shift (e.g., SN1 and electron transfer reactions) and related dynamics (e.g., dielectric relaxation and vibrational energy relaxation) in environmentally benign green solvents, in particular, room-temperature ionic liquids and supercritical water.

Computational study of supercapacitors and pseudocapacitors

Electric double layer capacitors (EDLCs) offer a promising energy storage system thanks to their high energy density and good power performance. Using computational methods, we study EDLCs based on microporous carbon electrodes in ionic liquids and organic electrolytes. Our main effort is directed towards quantitation of how electrode properties such as size and shape of carbon micropores and electrolyte properties, e.g., ion size, density and conductivity, control the energy and power densities of EDLCs.

Structure and dynamics of multi-domain proteins

Conformational changes of multi-domain proteins usually have a crucial influence on their functions. An excellent example is the activation of plasminogen to plasmin, which plays a key role in fibrinolysis. While there is strong experimental evidence that its activation is accompanied by closed-to-open conformational changes, 3D structure of entire plasminogen is not well understood. To gain insight into this important problem, we are performing large-scale simulations in collaboration with the Llinas group. Our current thrust is to investigate specific bindings and interactions between domains of plasminogen using various simulation techniques.

Education and Appointments
Years Position or Degree
2002–present Professor of Chemistry, Carnegie Mellon University
2002–2015 Head of Chemistry, Carnegie Mellon University
2001–2002 Interim Head of Chemistry, Carnegie Mellon University
1998–2002 Associate Professor of Chemistry, Carnegie Mellon University
1992–1998 Assistant Professor of Chemistry, Carnegie Mellon University
1988–1992 Postdoctoral research fellow, University of Colorado, Boulder
1988 Ph.D. State University of New York at Stony Brook
Awards and Distinctions
Years Award
2008-present KIAS Scholar, School of Computational Sciences, Korea Institute for Advanced Study
2007 Adjunct Professor of Physics, Korea University
2001 Visiting Associate Professor of Chemistry, University of Colorado, Boulder
2001 Distinguished Visiting Associate Professor of Physics, BK21, Seoul National University
Selected Publications

A Molecular Dynamics Study of Water Flow Across Multiple Layers of Pristine, Oxidized, and Mixed Regions of Graphene Oxide Jon A. L. Willcox and H. J. Kim, ACS Nano 2017, 11, 2187–2193.

Spectroscopic and MD Study of Dynamic and Structural Heterogeneities in Ionic Liquids Eric C. Wu, H. J. Kim and Linda A. Peteanu, J. Phys. Chem. B 2017, 12, 1100–1107.

A Mechanistic Insight into Organocatalytic Properties of Imidazolium-Based Ionic Liquids and a Positive Co-Solvent Effect on Cellulose Modification Reactions in an Ionic Liquid Ryohei Kakuchi, Ryo Ito, Shuhei Nomura, Hadi Abroshan, Kazuaki Ninomiya, Tomoyuki Ikai, Katsuhiro Maeda, H. J. Kim and Kenji Takahashi, RSC Adv. 2017, 7, 9423–9430.

Gold Nanoclusters Promote Electrocatalytic Water Oxidation at the Nanocluster/CoSe2 InterfaceShuo Zhao, Renxi Jin, Hadi Abroshan, Chenjie Zeng, Hui Zhang, Stephen D. House, Eric Gottlieb, H. J. Kim, Judith C. Yang and Rongchao Jin, J. Am. Chem. Soc. 2017, 139, 1077–1080.

CO2 capture in ionic liquid 1-alkyl- 3-methylimidazolium acetate: A concerted mechanism without carbene Fangyong Yan, Nilesh R. Dhumal and H. J. Kim, Phys. Chem. Chem. Phys. 2017, 19, 1361–1368.

A Molecular Dynamics Study of the Ionic Liquid, Choline Acetate Jon A. L. Willcox, Hyunjin Kim and H. J. Kim, Phys. Chem. Chem. Phys. 2016, 18, 14850–14858.

MD Study of Stokes Shifts in Ionic Liquids: Temperature Dependence Eric Wu and H. J. Kim, J. Phys. Chem. B 2016, 120, 4644–4653.

A Computer Simulation Study of Graphene Oxide Supercapacitors: Charge Screening Mechanism S.-W. Park, A. D. DeYoung, N. R. Dhumal, Y. Shim, H. J. Kim and Y. Jung, J. Phys. Chem. Lett. 2016, 7, 1180–1186.

Theoretical study of interactions of a Li+(CF3SO2)2N ion pair with CR3(OCR2CR2)nOCR3 (R = H or F)
Hadi Abroshan, Nilesh R. Dhumal, Youngseon Shim and Hyung J. Kim, Phys. Chem. Chem. Phys., 2016, 18, 6754–6762.

Molecular mechanism for the activation of Au25(SCH2CH2Ph)18 nanoclusters by imidazolium-based ionic liquids for catalysis
Hadi Abroshan, Gao Li, Jizhi Lin, Hyung J. Kim, Rongchao Jin, Journal of Catalysis, 2016, 337, 72–79

Molecular Interactions of a Cu-Based Metal Organic Framework with a Confined Imidazolium-Based Ionic Liquid: A Combined Density-Functional Theory and Experimental Vibrational Spectroscopy Study N. R. Dhumal, M. P. Singh, J. A. Anderson, J. Kiefer and H. J. Kim, J. Phys. Chem. C 2016, 120, 3295–3304.

On the Structural Stability of Ionic Liquid/IRMOF Composites: A Computational Study
H. Abroshan and H.J. Kim, Phys. Chem. Chem. Phys. 2015, 17, 6248–6254.

Experimental and Mechanistic Understanding of Aldehyde Hydrogenation Using Au25 Nanoclusters with Lewis Acids: Unique Sites for Catalytic Reactions
G. Li, H. Abroshan, Y. Chen, R. Jin and H.J. Kim, J. Am. Chem. Soc. 2015, 137, 14295–14304.