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

2009
Thiel P A; Shen M; Liu D J; Evans J W . 2009. Coarsening of Two-Dimensional Nanoclusters on Metal Surfaces. Journal of Physical Chemistry C. 113:5047-5067. abstract
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Shen M M; Liu D J; Jenks C J; Thiel P A; Evans J W . 2009. Accelerated coarsening of Ag adatom islands on Ag(111) due to trace amounts of S: Mass-transport mediated by Ag-S complexes. Journal of Chemical Physics. 130:094701. abstract
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Li M; Wang C Z; Evans J W; Hupalo M; Tringides M C; Ho K M . 2009. Competition between area and height evolution of Pb islands on a Si(111) surface. Physical Review B. 79:113404. abstract
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Li M Z; Han Y; Thiel P A; Evans J W . 2009. Formation of complex wedding-cake morphologies during homoepitaxial film growth of Ag on Ag(111): atomistic, step-dynamics, and continuum modeling. Journal of Physics-Condensed Matter. 21:084216. abstract
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Guo X F; Liu D J; Evans J W . 2009. Schloegl's second model for autocatalysis with particle diffusion: Lattice-gas realization exhibiting generic two-phase coexistence. Journal of Chemical Physics. 130:074106. abstract
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Albao M A; Chuang F C; Evans J W . 2009. Kinetic Monte Carlo simulation of an atomistic model for oxide island formation and step pinning during etching by oxygen of vicinal Si(100). Thin Solid Films. 517:1949-1957. abstract
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2008
Han Y; Unal B; Qin F L; Jing D P; Jenks C J; Liu D J; Thiel P A; Evans J W . 2008. Kinetics of facile bilayer island formation at low temperature: Ag/NiAl(110). Physical Review Letters. 100:116105. abstract
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Han Y; Evans J W; Liu D J . 2008. Quantum stabilities and growth modes of thin metal films: Unsupported and NiAl-supported Ag(110) and Ag(100). Surface Science. 602:2532-2540. abstract
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Li M; Chung P W; Cox E; Jenks C J; Thiel P A; Evans J W . 2008. Exploration of complex multilayer film growth morphologies: STM analysis and predictive atomistic modeling for Ag on Ag(111). Physical Review B. 77:033402. abstract
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Guo X F; Evans J W; Liu D H . 2008. Generic two-phase coexistence, relaxation kinetics, and interface propagation in the quadratic contact process: Analytic studies. Physica a-Statistical Mechanics and Its Applications. 387:177-201. abstract
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