Name:

Liming Wang

Introduction:

Liming Wang, Associate Professor
School of Chemistry and Chemical Engineering
Mobile: 13424468677        
E-mail: wanglm@scut.edu.cn
Ph. D., University of California, Riverside, USA, 2002
M. Sc., Dalian Institute of Chemical Physics, CAS, 1994.
B. Sc., Fudan University, China, 1991
2003-2005: Research Fellow, Leeds University, UK
2002-2003: Postdoc Research Associate, Emory University, USA

Research Areas:
Our research focuses on the environmental chemistry of organic pollutants and chemical reaction kinetics.
(1) Trace Air Pollutant Detections: We are currently developing high-sensitive optical absorption methods for trace air pollutant detections using CRDS (Cavity Ring-Down Spectroscopy) and CEAS (Cavity Enhanced Absorption Spectroscopy), etc. Using pulsed-laser CRDS, we have achieved detection limits of ~ 1 ppb for atmospheric HONO and of ~ 100 ppt for atmospheric NO2. Using diode laser, the portable apparatus can be constructed with even better detection limits and higher time resolution.
(2) Gas-Phase Reaction Kinetics of Organic Pollutants: We are currently studying the atmospheric oxidation mechanism of terpenes, which are considered as the major sources of atmospheric secondary organic aerosols. Our interest is in the reaction mechanism and OH radical formation mechanism from reactions of terpenes and ozone. CEAS is used to detect the reaction intermediates:
(3) Theoretical Chemical Reaction Kinetics: We are interested in the gas-phase reaction kinetics of key reactions occurred in the atmospheric and combustion environments. Free radicals play important roles in these environments. However, it is difficult to study the reaction mechanism experimentally, mainly due to the difficult in detecting the highly reactive and hence allusive free radicals. Our purpose is to study these reaction mechanisms using theoretical methods. High-level potential energy surfaces are first calculated, followed by RRKM/TST calculation with Master-Equation calculations. Our current interest is on the reaction kinetics involving peroxy and alkoxy radicals and the atmospheric oxidation mechanism of pinoaldehyde and nopinone, which are major products from atmospheric oxidation of - and -pinenes. The following diagram shows the potential energy surfaces of R + O2 reactions:
(4) NMR Determination of Organic Components in Atmospheric Aerosols: Atmospheric aerosols contain a large number of organic components which are crucial to hydroscopic and optical properties. This is particularly important to Pearl River Delta region after de-sulfured fossil fuel and coal are enforced. However, traditional LC-MS technique can only identify ~ 15 % of total organic mass due to mainly the solubility problem. We plan to use advanced NMR techniques to identify the whole spectrum of the organic components, particularly the DOSY (diffusion-ordered spectroscopy) technique for differentiating the components according to their diffusivity, or approximately their size.

Current Research Projects:
1. NSFC 20777017, Atmospheric Chemistry of Terpenes and Oxidation Intermediates, 08.1-10.12
2. Transformation of Organic Pollutants in Atmospheric Aerosol, Sponsored by Department of Education of China

Publications Since 2000:
1. David Ryan Glowacki, Liming Wang, Mike J Pilling,* Evidence for formation of bicyclic species in the early stages of atmospheric benzene oxidation, J. Phys. Chem. A, 113(18), 5385-5396 (2009)
2. Yi-Liang He, Liming Wang,* Cations of Halogenated Methanes: Adiabatic Ionization Energies, Potential Energy Surfaces, and Ion Fragment Appearance Energies, Struct. Chem., 20, 461-479 (2009)
3. David E. Bryant, David Greenfield, Richard D. Walshaw, Suzanne M. Evans, Alexander E. Nimmo, Caroline Smith, Liming Wang, Matthew A. Pasek, Terence P. Kee,* Electrochemical Studies of Iron Meterorites. Phosphorus Redox Chemistry on the Early Earth, Int. J. Astrobiology, 8(1), 27-36 (2009)
4. Liming Wang,* Yi-Liang He, Predictions of Thermodynamic Properties for Polychlorinated Dibenzofurans Using G3XMP2 Model Chemistry and Density Functional Theory, J. Phys. Chem. A, 113(1), 238-245 (2009)
5. Liming Wang,* Yi-Liang He, Halogenated Silanes, Radicals, and Cations: Theoretical Predictions on Ionization Energies, Structures and Potential Energy Surfaces of Cations, Proton Affinities, and Enthalpies of Formation, Int. J. Mass Spectrom. 276(1), 56-76 (2008)
6. Liming Wang,* Theoretical Studies on Thermochemistry of Stable Closed-Shell C1 and C2 Brominated Hydrocarbons, J. Phys. Chem. A, 112(22), 4951-4957 (2008)
7. Liming Wang,* Jingsong Zhang, Quantum Chemistry Study on Cation Structures of Fluorinated and Chlorinated Germanes and Their Radicals, J. Phys. Chem. A, 112(15), 3454-3465 (2008)
8. Liming Wang,* Mike J Pilling, Dewayne E Heard, Paul Seakins, A Gaussian-3X Prediction on the Enthalpies of Formation of Chlorinated Phenols and Dibenzo-p-dioxins, J. Phys. Chem. A, 112(9), 1832-1840 (2008)
9. Kenneth. W. McKee, Mark A. Blitz, Patricia A. Cleary, David R. Glowacki, Michael J. Pilling,* Paul W. Seakins, Liming Wang, Experimental and master equation study of the kinetics of OH + C2H2: Temperature dependence of the limiting high pressure and pressure dependence coefficients, J. Phys. Chem. A, 111, 4043-4055 (2007)
10. Liming Wang,* The gas-phase Thermochemistry of SeFn, SeFn+, and SeFn- (n = 1-6) from Gaussian-3 calculations, Int. J. Mass. Spectrom., 264, 84-91 (2007)
11. Liming Wang,* Clusters of Hydrated Methane Sulfonic Acid CH3SO3H•(H2O)n (n = 1-5) – A Theoretical Study, J. Phys. Chem. A, 111, 3642-3651 (2007)
12. P. A. Cleary, M. T. B. Romero, M. A. Blitz, D. E. Heard, M. J. Pilling,* P. W. Seakins, Liming Wang, Determination of the temperature and pressure dependence of the reaction OH + C2H4 from 200-400 K using experimental and master equation analyses, Phys. Chem. Chem. Phys., 8(48), 5633-5642 (2006)
13. James Hargrove, Liming Wang, Karen Muyskens, Mark Muyskens, David Medina, Susan Zaide, Jingsong Zhang,* Cavity ring-down spectroscopy of ambient NO2 with quantification and elimination of interferences, Environ. Sci. Technol., 40, 7868-7873 (2006)
14. Ian B. Gorrell, Liming Wang, Alison J. Marks, David E. Bryant, Frédérique Bouillot, Andrew Goddard, Dwayne E. Heard, and Terence P. Kee,* On the origin of the Murchison meteorite phosphonates. Implications for pre-biotic chemistry, Chem. Comm. 1643-1645 (2006)
15. N. Choi, M. J. Pilling, P. W. Seakins,* Liming Wang, Studies of site selective hydrogen atom abstractions by Cl atoms from isobutene and propane by laser flash photolysis / IR diode laser spectroscopy, Phys. Chem. Chem. Phys., 8, 2172-2178 (2006)
16. M. T. B. Romero, M. A. Blitz, D. W. Heard, M. J. Pilling, B. Price, P. W. Seakins,* Liming Wang, Photolysis of methylethyl, diethyl and methylvinyl ketones and their role in the atmospheric HOx budget, Faraday Discuss. 130 (on Atmospheric Chemistry), 73 (2005)
17. S. D. Chambreau, J. Lemieux, Liming Wang, Jingsong Zhang,* Mechanistic studies of the pyrolysis of 1,3-butadiene, 1,3-butadiene-1,1,4,4-d4, 1,2-butadiene, and 2-butyne by supersonic jet / photoionization mass spectrometry, J. Phys. Chem. A109, 2190-2196 (2005)
18. Liming Wang, Jingsong Zhang,* Theoretical studies on thermochemistry of chlorinated and fluorinated germanes and their radical fragments. J. Phys. Chem. A108, 10346-10353 (2004)
19. Liming Wang, Jingsong Zhang,* Near-Ultraviolet Absorption Spectrum of Vinoxy Radical (CH2CHO) by Cavity Ringdown Spectroscopy, Chinese J. Chem. Phys., 17(3), 357-361 (2004)
20. Y. M. Choi, J. Park, Liming Wang, M. C. Lin,* Formation and decomposition of phenylvinylperoxy radicals in the reaction: C6H5C2H2 + O2, ChemPhysChem, 5, 1231-1234 (2004)
21. J. Park, Liming Wang, M. C. Lin,* Kinetics of Phenyl Radical Reactions with Propane, n-Butane, n-Hexane and n-Octane: Reactivity of C6H5 toward the Secondary C-H Bond of Alkanes, Int. J. Chem. Kinet., 36, 49-56 (2004)
22. Steven Chambreau, Liming Wang & Jingsong Zhang,* Highly unsaturated silicon clusters, SinHx (n = 3-10, x = 0-3), in flash pyrolysis of silane and disilane, J. Phys. Chem. A106, 5081-5087 (2002)
23. Liming Wang & Jingsong Zhang,* Ab Initio Study of Reaction of Dimethyl Sulfoxide (DMSO) with OH Radical, Chem. Phys. Lett., 356, 490-496 (2002)
24. Liming Wang & Jingsong Zhang,* Ab Initio Calculation on Thermochemistry of CH3SOxH (x = 1, 2, 3) and H2SOy (y = 2, 3), J. Mol. Struct. (THEOCHEM), 581, 129-138 (2002)
25. Liming Wang & Jingsong Zhang,* Addition complexes of dimethyl sulfide (DMS) and OH radical and their reactions with O2 by ab initio and density functional theory, J. Mol. Struct. (THEOCHEM), 543, 167-175 (2001)
26. Liming Wang & Jingsong Zhang,* Detection of Nitrous Acid by Cavity Ring-Down Spectroscopy, Environ. Sci. Technol., 34, 4221-4227 (2000)