Jillian F. Banfield Professor I am currently on sabbatical in the Department of Microbiology and Parasitology, University of Queensland until January 2001. Address/E-mail Program Affiliations Education Fields of Interest Publications Summary For additional information, see my

Contact Information

315 Lewis G. Weeks Hall For Geological Science 1215 West Dayton Street Madison, WI 53706

Tel: 608/265-9528 Fax: 608/262-0693 E-mail: jill@geology.wisc.edu

Program Affiliations

• Materials Science Program

Education

• PhD, Johns Hopkins University

Fields of Interest

• nanocrystalline materials (kinetics and thermodynamics)
• biomineralization and biomimetics

Publications

• Banfield, J.F., Welch, S.A., Zhang, H., Ebert, T.T., and Penn, R.L. (2000) The role of aggregation in crystal growth and transformations in nanophase FeOOH biomineralization products. Science, in press.
• Labrentz, M., Druschel, G.K., Thomsen-Ebert, T., Gilbert, B., Welch, S.A., Kemner, K.,. Logan, G.A., Summons, R., De Stasio, G., Bond, P.L., Lai, B., Kelley, S.D. and Banfield, J.F.Natural formation of nanocrystalline sphalerite (ZnS) by sulfate-reducing bacteria. Science, in prep.
• Penn, R.L. and Banfield, J.F. Growth modification via adsorption of mono- and di-functional carboxylic acids: Nanocrystalline anatase (TiO2) in aqueous suspensions. Geochim Cosmochim Acta, in review.
• Zhang, H. and Banfield, J.F. Phase transformations in nanocrystalline TiO2 ceramic membranes versus powder samples. J. Materials Chem, in review.
• Zhang H. and J. F. Banfield, Phase transformation of nanocrystalline anatase-to-rutile via combined interface and surface nucleation (2000) Journal of Materials Research, 15(2), 437-448.
• Zhang, H. and Banfield, J.F. (2000) Understanding polymorphic phase transformation behavior during growth of nanocrystalline aggregates: insights from TiO2. Journal of Physical Chemistry B., 104, 3481 -3487
• Zhang, H. and Banfield, J.F. (1999) A new kinetic model for the anatase-to-rutile phase transformation in nanocrystalline material revealing a second order dependence on the number of particles. American Mineralogist, 84, 528-535.
• Penn, R.L., Banfield, J.F., and Kerrick, D.M. (1999) TEM investigation of Lewiston, Idaho Fibrolite: Implications for grain boundary energetics and Al2SiO5 phase relations. American Mineralogist, 84, 152-159.
• Penn, R.L. and Banfield, J.F. (1999) Morphology development and crystal growth in nanocrystalline aggregates under hydrothermal conditions: insights from titania. Geochim. Cosmochim. Acta, 63, 1549-1557.
• Zhang, H., Penn, R.L., Hamers, R.J., and Banfield, J.F (1999) Enhanced Adsorption on Surfaces of Nanocrystalline Materials. J. Phys. Chem. B. 103, 4656 -4662.
• Penn R.L. and Banfield J.F. (1999) Formation of rutile nuclei at anatase {112} twin interfaces and the phase transformation mechanism in nanocrystalline titania, American Mineralogist, 84, 871- 876.
• Zhang, H. and Banfield, J.F. (1998) A model for exploring particle size and temperature dependence of excess heat capacities of nanocrystalline substances. NanoStructured Materials, 10, 184-195.
• Zhang, H. and Banfield, J.F. (1998) Phase stability in the nanocrystalline TiO2 system "Phase Transformations and Systems Driven Far >From Equilibrium", Eds. E. Ma, P. Bellon, M. Atzmon, R. Trivedi, MRS, 619-624
• Zhang, H. and Banfield, J.F. (1998) Thermodynamic analysis of phase stability in nanocrystalline titania. Journal of Materials Chemistry, 8, 2073-2076.
• Penn, R.L. and Banfield, J.F. (1998) Imperfect oriented attachment: a mechanism for dislocation generation in defect-free nanocrystals. Science, 281, 969-971.
• Penn, R.L. and Banfield, J.F. (1998) Oriented attachment and growth, twinning, polytypism, and formation of metastable phases: insights from nanocrystalline TiO2. American Mineralogist, 83, 1077-1082.
• Gribb, A.A. and Banfield, J.F. (1997) Particle size effects on transformation kinetics and phase stability in nanocrystalline TiO2. American Mineralogist, 82, 717-729
• Penn, R.L., Banfield, J.F., and Voigt, J. (1996) Synthesis of nanocrystalline barium hexaferrite from nanocrystalline goethite using the hydrothermal method. Materials Research Society, 432, 175-181.

Summary

My research is directed toward atomic-level understanding of the structure and chemistry of minerals, their microstructures, and surfaces, with emphasis on reactions that are taking place at or near mineral-mineral and mineral-solution interfaces. Examples include investigations into the role of surface adsorption in morphology development of finely crystalline materials, the role of surface related variables in controlling the behavior of nanocrystalline materials, and the inorganic and organic factors controlling the rates and mechanisms of dissolution of metal sulfide minerals. For details of these and other projects, see: http://www.geology.wisc.edu/~jill/banres.html.