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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

2011
Belianinov A; Unal B; Ho K M; Wang C Z; Evans J W; Tringides M C; Thiel P A . 2011. Nucleation and growth of Ag islands on the (root 3 x root 3)R30 degrees phase of Ag on Si(111). Journal of Physics-Condensed Matter. 23:265002. abstract
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Liu D J; Wang J; Ackerman D M; Slowing I I; Pruski M; Chen H T; Lin V S Y; Evans J W . 2011. Interplay between Anomalous Transport and Catalytic Reaction Kinetics in Single-File Nanoporous Systems. ACS Catalysis. 1:751-763. abstract
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Shen M M; Jenks C J; Evans J W; Thiel P A . 2011. How Sulfur Controls Nucleation of Ag Islands on Ag(111). Topics in Catalysis. 54:83-89. abstract
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Ackerman D M; Wang J; Wendel J H; Liu D J; Pruski M; Evans J W . 2011. Catalytic conversion reactions mediated by single-file diffusion in linear nanopores: Hydrodynamic versus stochastic behavior. Journal of Chemical Physics. 134:114107. abstract
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Duguet T; Han Y; Yuen C; Jing D P; Unal B; Evans J W; Thiel P A . 2011. Self-assembly of metal nanostructures on binary alloy surfaces. Proceedings of the National Academy of Sciences of the United States of America. 108:989-994. abstract
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Ackerman D M; Evans J W . 2011. Boundary Conditions for Burton-Cabrera-Frank Type Step-Flow Models: Coarse-Graining of Discrete 2d Deposition-Diffusion Equations. Multiscale Modeling & Simulation. 9:59-88. abstract
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2010
Guo X F; De Decker Y; Evans J W . 2010. Metastability in Schloegl's second model for autocatalysis: Lattice-gas realization with particle diffusion. Physical Review E. 82:021121. abstract
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Arora P; Li W; Piecuch P; Evans J W; Albao M; Gordon M S . 2010. Diffusion of Atomic Oxygen on the Si(100) Surface. Journal of Physical Chemistry C. 114:12649-12658. abstract
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Duguet T; Unal B; Han Y; Evans J W; Ledieu J; Jenks C J; Dubois J M; Fournee V; Thiel P A . 2010. Variation of growth morphology with chemical composition of terraces: Ag on a twofold surface of a decagonal Al-Cu-Co quasicrystal. Physical Review B. 82:224204. abstract
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Thiel P A; Shen M M; Liu D J; Evans J W . 2010. Adsorbate-enhanced transport of metals on metal surfaces: Oxygen and sulfur on coinage metals. Journal of Vacuum Science & Technology A. 28:1285-1298. abstract
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