Steve Constance

Materials and Transportation

160 Spedding Hall

The Ames laboratory

Ames,  IA  50011-3020



Ames Laboratory has a number of education programs that involve elementary school students through graduate students. Scientific and engineering staff at the Laboratory total more than 250, with more than 100 university students comprising a vital part of that total.

Dr. Da-Jiang Liu

Associate Scientist
307B Wilhelm Hall
The Ames Laboratory
Ames, IA 50011-3020
Phone 515-294-0266
Fax 515-294-9927

Research Interests

  • Modeling of surface processes related to chemistry and materials.
  • Catalytic surface reaction: multiscale modeling of spatial-temporal patterns, connecting atomistic simulations of reaction and continuous description of diffusion; fluctuations and bifurcations of chemical reactions on nanoscale particles.
  • Metal thin films: restructuring and diffusion of nanostrustures in epitaxal films.
  • Etching of semiconductor surfaces.

        Project Affiliations:
        Chemical Physics

(Chronologically most recent on top)Education

  • 2005-present, Associate Scientist, Ames Laboratory, Iowa State University
  • 2002-2005, Assistant Scientist, Ames Laboratory, Iowa State University
  • 1998-2002, Postdoctoral Research Associate, Ames Laboratory, Iowa State University
  • Ph.D. 1998, University of Maryland at College Park
  • B.Sc. 1991, University of Science and Technology of China

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

Unal B; Qin F; Han Y; Liu D J; Jing D P; Layson A R; Jenks C J; Evans J W; Thiel P A . 2007. Scanning tunneling microscopy and density functional theory study of initial bilayer growth of Ag films on NiAl(110). Physical Review B. 76:195410. abstract
Export: Tagged BibTex

Wang Y D; Ren Y; Nie Z H; Liu D M; Zuo L; Choo H; Li H; Liaw P K; Yan J Q; McQueeney R J; Richardson J W; Huq A . 2007. Structural transition of ferromagnetic Ni2MnGa nanoparticles. Journal of Applied Physics. 101:063530. abstract
Export: Tagged BibTex

Guo X F; Liu D J; Evans J W . 2007. Generic two-phase coexistence, relaxation kinetics, and interface propagation in the quadratic contact process: Simulation studies. Physical Review E. 75:061129. abstract
Export: Tagged BibTex

Shen M M; Wen J M; Jenks C J; Thiel P A; Liu D J; Evans J W . 2007. Ripening of monolayer vacancy pits on metal surfaces: Pathways, energetics, and size-scaling for Ag(111) versus Ag(100). Physical Review B. 75:245409. abstract
Export: Tagged BibTex

Liu D J; Evans J W . 2007. Fronts and fluctuations in a tailored model for CO oxidation on metal(100) surfaces. Journal of Physics-Condensed Matter. 19:065129. abstract
Export: Tagged BibTex

Liu D J; Evans J W . 2007. Fluctuations and patterns in nanoscale surface reaction systems: Influence of reactant phase separation during CO oxidation. Physical Review B. 75:073401. abstract
Export: Tagged BibTex

Liu D; Guo X F; Evans J W . 2007. Quadratic contact process: Phase separation with interface-orientation-dependent equistability. Physical Review Letters. 98:050601. abstract
Export: Tagged BibTex

Fleet Vehicles

General Information:

The Materials and Transportation Fleet Vehicle section provides acquisition, utilization and maintenance records, and disposal of vehicles used in support of research conducted by Ames Laboratory employees.

Precious Metals

General Information:

The Materials Handling group provides Precious Metals receiving and documentation (PM's) for research programs funded by the Department of Energy (DOE). Precious metals are obtained from the DOE's Business Center for Precious Metals Sales and Recovery (BCPMSR). The return of  scrap and excess precious metals to the BCPMSR is also provided by this group. Metals under this control are:

Express Package Shipping Services

General Information:

The materials handling office's express package shipping service offers overnight domestic letter and parcel service for official business only. Express international shipments are also offered. Many hazardous and non-hazardous materials may be shipped by express. This service is provided to Ames Laboratory personnel.

Mail Services

General Information:

Mail Services provides U.S. Postal Service (USPS) and ISU campus mail receiving, sorting and outbound service. This service is available for all Ames Laboratory official business.

Quick Links to Schedules:


Storeroom Services


General Information:

The Ames laboratory storeroom offers materials in commodities of building supplies, hardware and small tools, gases, metals, electrical material and supplies, electronic supplies, mechanical material and supplies, custodial supplies, office supplies, and laboratory supplies. These materials are available to all Ames Laboratory personnel, if approved by their supervisor.

Hazardous Material Shipments

GET (General Employee Training):
General Information:

Materials and Transportation personnel perform domestic and international shipping activities associated with hazardous materials transported onsite and offsite.

shipping and Receiving Services

General Information:

Shipping and Receiving services are provided for Ames Laboratory personnel. A central receiving and distribution facility on Kooser Dr. is operated by the  Materials and Transportation group. Daily on-site deliveries are made of gases, inbound express mail, credit card and purchase order packages.

Shipping Address for ALL packages to Ames Laboratory: