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

2012
Wang C J; Liu D J; Evans J W . 2012. Schloegl's second model for autocatalysis on hypercubic lattices: Dimension dependence of generic two-phase coexistence. Physical Review E. 85:041109. abstract
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Guo X F; Unruh D K; Liu D J; Evans J W . 2012. Tricriticality in generalized Schloegl models for autocatalysis: Lattice-gas realization with particle diffusion. Physica A-Statistical Mechanics and Its Applications. 391:633-646. abstract
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2011
Roskop L; Evans J W; Gordon M S . 2011. Adsorption and Diffusion of Gallium Adatoms on the Si(100)-2 x 1 Reconstructed Surface: A Multiconfiguration Self-Consistent Field Study Utilizing Molecular Surface Clusters. Journal of Physical Chemistry C. 115:23488-23500. abstract
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Thiel P A; Unal B; Jenks C J; Goldman A I; Canfield P C; Lograsso T A; Evans J W; Quiquandon M; Gratias D; Van Hove M A . 2011. A Distinctive Feature of the Surface Structure of Quasicrystals: Intrinsic and Extrinsic Heterogeneity. Israel Journal of Chemistry. 51:1326-1339. abstract
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Han Y; Jing D P; Unal B; Thiel P A; Evans J W . 2011. Far-from-equilibrium film growth on alloy surfaces: Ni and Al on NiAl(110). Physical Review B. 84:113414. abstract
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Wang C J; Guo X F; Liu D J; Evans J W . 2011. Schloegl's Second Model for Autocatalysis on a Cubic Lattice: Mean-Field-Type Discrete Reaction-Diffusion Equation Analysis. Journal of Statistical Physics. 144:1308-1328. abstract
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Han Y; Unal B; Jing D P; Thiel P A; Evans J W . 2011. Temperature-dependent growth shapes of Ni nanoclusters on NiAl(110). Journal of Chemical Physics. 135:084706. abstract
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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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