Slawomir Lomnicki

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Slawo (Slawomir) M. Lomnicki

Research Assistant Professor - Physical Chemistry and Heterogeneous Processes

MS: A. Mickiewicz University, Poznan, Poland

PhD: A. Mickiewicz University, Poznan, Poland

PostDoc: University of South Carolina

Phone: (225) 578-4417

E-mail: slomni1@lsu.edu

Office: 400 Choppin Hall

Area of Interest

Nanoparticles and nanoclusters have unique properties discriminating them from bulk materials. The basic understanding of the relation of the particle size and their chemical properties is one of the main research themes. We have developed a synthetic route allowing for a precise control of the size of the supported metal oxide or metal nanoclusters with the precision of 0.2 nm. Currently supported Iron, Copper, Nickel and Silver oxide can be synthesized in the cluster size range 0.8-5 nm. These clusters can be attached to different matrixes such as silica, titania or magnesia. We are attempting to increase the available size range of supported nanoclusters up to 50 nm without loss of size resolution.

Initial experiments with the metallic clusters are also very promising. Supported metallic silver nanoclusters were synthesized with the same cluster size accuracy and resolution .

Iron oxide nanoclusters with the diametr size of 3.2nm +/- 0.2 supported on silica

The ability to control the size and related with it activity opens a new door for the design of new catalytic systems. It is anticipated that with the size control, one can manipulate the selectivity of the catalytic reaction towards desired products. Using this approach, we are working on catalytic systems for synthesis of new renewable fuels or fuels from waste materials. As an example, development of the catalyst to convert cellulose (the waste part of agricultural crops is usually rich in cellulose) into liquid fuels will provide an unlimited source of renewable energy source.

Number of EPFRs formed on the copper oxide nanoclusters as a function of cluster size

Surface reactivity of nanoparticles has important implications to environment and human health. Ambient air contains a significant amount of particles smaller than 100nm (so called PM0.1). Also man made nanomaterials are more often present in human environments nowadays. We are studying the reactivity of small particles with organic molecules occurring in the environment and their ability to form particle bound Environmentally Persistent Free Radicals (EPFR). We have developed the mechanism of the surface-adduct interaction resulting in an electron transfer from the adsorbate to metal ion center resulting in the formation of surface stabilized radicals. These radicals are characterized in an exceptional stability in air in the range of days or even longer. Formation yield (and possibly stability) of surface bound radicals is also sensitive to the size of particles. The effect of surface-radical adducts on living organisms and environment is evaluated.

Selected Publications

Balakrishna, S.; Lomnicki, S.; McAvey, K. M.; Cole, R. B.; Dellinger, B.; Cormier, S. A., Environmentally Persistent Free Radicals Amplify Ultrafine Particle Mediated Cellular Oxidative Stress and Cytotoxicity, Particle and Fibre Toxicology 2009, 6.

Nganai S.; Lomnicki S.; Dellinger B.; Ferric Oxide Mediated Formation of PCDD/Fs from 2-Monochlorophenol, Environ. Sci. Technol, 2009, 43, 368-373

Balakrishna, S.; Lomnicki, S.; Dellinger, B.; Cormier, S. A., Resveratrol Ameliorates the Redox Imbalances in Human Airway Epithelial Cells Exposed to Combustion Generated Nanoparticles, Free Radical Bio Med 2008, 45, S44-S44.

Truong, H.; Lomnicki, S.; Dellinger, B.; Mechanisms of Molecular Product and Persistent Radical Formation from the Pyrolysis of Hydroquinone, Chemosphere 2008, 71 (1), 107-113.

Lomnicki, S.; Truong, H.; Vajereno, E.; Dellinger, B., A Copper Oxide-Based Model of Persistent Free Radical Formation on Combustion Derived Particulate Matter Environ. Sci. Technol. 2008, 42 (13), 4982-4988

Khachatryan, L.; Lomnicki, S.; Dellinger, B.; An Expanded Reaction Kinetic Model of the CuO Surface-Mediated Formation of PCDD/F from Pyrolysis of 2-chlorophenol. Chemosphere 2007, 68 (9), 1741-1750.

Dellinger, B.; Lomnicki, S.; Khachatryan, L.; Maskos, Z.; Hall, R. W.; Adounkpe, J.; McFerrin, C.; Truong, H., Formation and Stabilization of Persistent Free Radicals. Proceedings of the Combustion Institute 2007, 31 (1), 521-528.

Cormier S.; Lomnicki S.; Backes W.; Dellinger B.; Origin and Health Impacts of Emissions of Toxic By-Products and Fine Particles from Combustion and Thermal Treatment of Hazardous Wastes and Materials, Environ. Health Persp., 114 (2006) 801-817

Lomnicki S.; Dellinger B.; Developement of Iron Oxide/Titania Catalyst for Dioxin Decomposition, Environ. Sci. Technol., 37 (2003) 4254-4260

Lomnicki S.;.Lichtenberger J.; Xu X.; Waters M.; Kosman J.; Amiridis M.D.; Catalytic Oxidation of 2,4,6-Trichlorophenol Over Vanadia/Titania-Based Catalysts, Appl. Catal.,(2003) 46, 105-119

Lomnicki S.; Dellinger B.; A Detailed Mechanism of the Surface-Mediated Formation of PCDD/F from the Oxidation of 2-Chlorophenol on CuO/ Silica Surface, J. Phys. Chem. A, 107 (2003) 4387-4395

This page was last updated Thursday, October 15, 2009

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