|
Research Interests:
"Life at the edge"-Surfaces are where the action is.
Our research program is aimed at characterizing and understanding chemical reactions at surfaces. Interfacial processes and surface chemistry are at the heart of technologies associated with the chemical and petroleum industries, production of microelectronic devices, and design and fabrication of sensors and diagnostic devices, and play key roles in heterogeneous processes in environmental and atmospheric chemistry. By discovering novel methods to alter and control surface chemistry we seek to develop new catalysts for specialty chemical synthesis, make advanced materials with novel properties, and build functional nanostructures from a "bottom-up" approach utilizing directed manipulation and layered nanofabrication at surfaces and interfaces. Surfaces are central to nanoscience and technology, modifying and controlling important properties of nanoparticles and electrical contacts. We employ a wide array of surface analytical techniques in our work, including scanning tunneling microscopy (STM), high resolution X-ray photoelectron spectroscopy (XPS), and infrared reflection-absorption spectroscopy (IRAS).
Current research activities include: (i) understanding the structure, reactivity, and catalysis of bimetallic Pt alloys, (ii) investigating bond-selective chemistry using low energy electrons and ions, (iii) probing chemistry and catalysis at Au surfaces and nanoparticles, (iv) elucidating kinetics and mechanism of ozonolysis of hydrocarbon films, (v) characterization of novel PEM fuel cell electrodes, (vi) development of Rutherford backscattering (RBS) as a novel probe of liquid-solid interfaces, and (vii) measurements and fabrication of nanostructures by self-assembly and directed manipulation.
Teaching Interests:
I particularly enjoy teaching in the General (Freshman) Chemistry program. I try to show that applications are everywhere and to communicate the excitement of recent scientific advances, e.g. , observation, manipulation, and control of reactivity at the atomic scale. At the graduate level, I have primarily taught a course in Surface Chemistry. Depending on student interest, this course has emphasized more or less the various aspects of the field, such as kinetics, bonding and mechanistic chemistry or surface analysis.
Recent Publications:
2006
218. “Oxygen adsorption and oxidation reactions on Au(211) surfaces: Exposures using O2 at high pressures and ozone (O3) in UHV”, J. Kim, E. Samano, and B. E. Koel, Surface Sci., 600, 4622-4632 (2006).
217. “CO Adsorption and Reaction on Clean and Oxygen-Covered Au(211) Surfaces”, J. Kim, E. Samano and B. E. Koel, J. Phys. Chem. B, 110, 17512-17517 (2006).
216. Chapter 3.8.4 “Adsorbed CO2, NO2, O3, SO2, OCS, and N2O on Metals”, C. Panja, J. Kim, E. C. Samano, and B. E. Koel, in Adsorbed Layers on Surfaces, Landolt-Bornstein Volume III/42 , H. Bonzel (Ed.), (Springer-Verlag, Berlin-Heidelberg, 2006), pp. 170-241.
215. “Catalytic oxidation of HCN over a 0.5% Pt/Al2O3 catalyst”, H. Zhao , R. G. Tonkyn, S. E. Barlow, B. E. Koel, and C. H. F. Peden, Applied Catalysis B: Environmental, 65, 282-290 (2006).
214. “Fractional factorial study of HCN removal over a 0.5% Pt/Al2O3 catalyst: Effects of temperature, gas flow rate, and reactant partial pressure”, H. Zhao, R. G. Tonkyn, S. E. Barlow, C. H. F. Peden, and B. E. Koel, Ind. Eng. Chem. Res., 45, 934-939 (2006).
213. “Desorption of Chemisorbed Carbon on Mo(100) by Noble Gas Ion Sputtering: Validation of Ground Test Measurements of Ion Engine Lifetimes,” C.-S. Ho, S. Banerjee, B. E. Koel. O. B. Duchemin, and J. E. Polk, Appl. Surface Sci., 252, 2657-2664 (2006).
2005
212. "Demonstration of an In-situ Electrochemical RBS System to Study Electrode-Electrolyte Interfaces", A. Hightower, B.E. Koel, and T. Felter, in Electrode Processes VII (from the 206th Meeting of The Electrochemical Society, Honolulu, HI, Oct. 3-8, 2004, ECS Proceedings, Vol. 2004-18) , V.I. Birss, D. Evans, M. Josowicz, and M. Osawa (Eds.), (ECS,Pendington, NJ, 2005), p. 46-54.
211. "Fabrication of Polystyrene Latex nanostructures by Nanomanipulation and Thermal Processing," E. Harel, S.E. Meltzer, A.A.G. Requicha, M.E. Thompson, and B.E. Koel, Nano Lett., 5, 2624-2629 (2005).
210. "TPD and FT-IRAS investigation of ethylene oxide (EtO) adsorption on a Au(211) stepped surface", J. Kim and B.E. Koel, Langmuir, 21, 3886-3891 (2005).
209. "Hydrogenation of 1,3-butadiene on two ordered Sn/Pt(111) surface alloys", H. Zhao and B.E. Koel, J. Catal., 234, 24-32 (2005).
208. "Reactivity of Ethyl Groups on a Sn/Pt(111) Surface Alloy", H. Zhao and B.E. Koel, Catal. Lett., 99, 27-32 (2005).
207. "Influence of coadsorbed hydrogen on ethylene adsorption and reaction a ( 3x 3)R30°-Sn/Pt(111) surface alloy", H. Zhao, and B.E. Koel, Langmuir, 21(3), 971-975 (2005).
|