Dr. James W. Evans

Ames Laboratory Associate and Professor, Iowa State University
Address
315 Wilhelm Hall
The Ames Laboratory
Ames, IA 50011-3020
Phone 515-294-1638
Fax 515-294-4709
Email evans@ameslab.gov

Research Interests

  • Spatiotemporal behavior in chemisorption and catalysis on metal surfaces: realistic atomistic-level modeling of reaction kinetics; analysis of chemical diffusion and multi-scale modeling of reaction-diffusion behavior; analysis of fluctuations in nanoscale systems.
  • Fundamental statistical mechanical studies of far-from-equilibrium reaction-diffusion phenomena including kinetic phase transitions.
  • Interplay between anomalous transport and reaction in catalytically-functionalized mesoporous and nanoporous materials.
  • Self-assembly and stability of single- and multi-component epitaxial metal nanostructures formed by deposition on single-crystal surfaces.
  • Growth and relaxation epitaxial thin films: submonolayer nucleation & growth of islands; multilayer kinetic roughening; post-deposition coarsening; step flow during growth and erosion.
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    Selected Projects

  • Realistic multi-site lattice-gas models for CO-oxidation on Pd(100), Rh(100), Pt(100), and other surfaces.
  • Heterogeneous-coupled-lattice-gas modeling of patterns and fronts in catalytic surface reactions (HCLG is our Heterogeneous Multiscale Method).
  • Statistical mechanical analysis of discontinuous poisoning transitions (including generic two-phase coexistence and metastability) in reaction-diffusion models.
  • Modeling of catalytic conversion reactions and polymerization reactions in nanoporous systems with single-file diffusion.
  • Continuous-random-network models structure of amorphous materials (e.g., mesoporous oxide catalysts).
  • Formation of epitaxial nanostructures by deposition on a NiAl(110) binary alloy substrate, including analysis of alloy self-growth.
  • Effect of chalcogen additives (S, O) on stability of noble metal surface nanostructures (including additive-enhanced coarsening and cluster mobility).
  • Predictive atomistic and coarse-grained modeling of homoepitaxial thin film growth (for both submonolayer and multilayer regimes).
  • Development of general multi-site lattice-gas models and KMC simulation algorithms incorporating precise kinetics (surface diffusion barriers) for epitaxial systems.

        Project Affiliations:
        Chemical Physics

        Group Website:
        Evans Research Group

(Chronologically most recent on top)Education

  • Postdoctoral Fellow, 1979-81, Chemical Physics, Iowa State University
  • Ph.D. 1979, Mathematical Physics, University of Adelaide, Australia
  • B.Sc. (Hons) 1975, Mathematics, University of Melbourne, Australia

(Chronologically most recent on top)Professional Appointments

  • Senior Scientist, 1996-present; Chemist, 1993-96; Associate Scientist, 1983-93; Assistant Chemist, 1982-83, Ames Laboratory-USDOE.
  • Professor of Physics & Astronomy, 2010-present, Iowa State University
  • Professor of Mathematics, 1996-present; Associate Professor of Mathematics, 1991-1996, Iowa State University.
  • Visiting Scientist, Institute of Mathematics & its Applications, U. Minnesota, 2009.
  • Visiting Scientist, Institute of Physics - CAS, Beijing, 2009.
  • Visiting Scientist, Ecole des Mines, Nancy, France, 2000.
  • Visiting Scientist, Fritz Haber Institute, Berlin, Germany, 1991.

(Chronologically most recent on top)Honors & Awards

  • Fellow of the American Physical Society, 2002-present.

(Chronologically most recent on top)Publications with the Ames Laboratory

2014
Woehl T J; Park C; Evans J E; Arslan I; Ristenpart W D; Browning N D . 2014. Direct Observation of Aggregative Nanoparticle Growth: Kinetic Modeling of the Size Distribution and Growth Rate. Nano Letters. 14:373-378. abstract
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2013
Liu D J; Evans J W . 2013. Realistic multisite lattice-gas modeling and KMC simulation of catalytic surface reactions: Kinetics and multiscale spatial behavior for CO-oxidation on metal (100) surfaces. Progress in Surface Science. 88:393-521. abstract
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Wang C J; Han Y; Walen H; Russell S M; Thiel P A; Evans J W . 2013. Analytic formulations for one-dimensional decay of rectangular homoepitaxial islands during coarsening on anisotropic fcc (110) surfaces. Physical Review B. 88:155434. abstract
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Han Y; Russell S M; Layson A R; Walen H; Yuen C D; Thiel P A; Evans J W . 2013. Anisotropic coarsening: One-dimensional decay of Ag islands on Ag(110). Physical Review B. 87:155420. abstract
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Han Y; Engstfeld A K; Behm R J; Evans J W . 2013. Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene. Journal of Chemical Physics. 138:134703. abstract
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Wang J; Ackerman D M; Lin V S Y; Pruski M; Evans J W . 2013. Controlling reactivity of nanoporous catalyst materials by tuning reaction product-pore interior interactions: Statistical mechanical modeling. Journal of Chemical Physics. 138:134705. abstract
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Russell S M; Kim Y; Liu D J; Evans J W; Thiel P A . 2013. Communication: Structure, formation, and equilibration of ensembles of Ag-S complexes on an Ag surface. Journal of Chemical Physics. 138:071101. abstract
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2012
Engstfeld A K; Hoster H E; Behm R J; Roelofs L D; Liu X J; Wang C Z; Han Y; Evans J W . 2012. Directed assembly of Ru nanoclusters on Ru(0001)-supported graphene: STM studies and atomistic modeling. Physical Review B. 86:085442. abstract
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Han Y; Unal B; Evans J W . 2012. Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110). Physical Review Letters. 108:216102. abstract
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Ackerman D M; Wang J; Evans J W . 2012. Generalized Hydrodynamic Treatment of the Interplay between Restricted Transport and Catalytic Reactions in Nanoporous Materials. Physical Review Letters. 108:228301. abstract
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