Brian Phillips

Professor 
Office: ESS 240    
E-mail: brian.phillips "at" stonybrook.edu


B.S., Bowling Green State University, 1984 
Ph.D., University of Illinois at Urbana-Champaign, 1990 
Postdoctoral Research Associate, Lawrence Livermore National Laboratory, 1991-1994 
Research Associate, University of California, Davis, 1994-2002 
Faculty member at Stony Brook since 2002 


 

 

I have broad research interests in the general areas of geochemistry and mineralogy, with an emphasis on the molecular-level structure of minerals and their surfaces.

Environmental Molecular Science: A primary goal of my current research efforts is to understand the processes and reaction mechanisms operating at mineral-water interfaces, and the control that surface chemistry exerts on the rates of surface-controlled reactions such as dissolution, precipitation, and coprecipitation of impurities. The composition of fluids in near-surface environments are modified through reactions with minerals. The rates of these reactions determines how quickly contaminants can be transferred between fluid and solid phases, whether they can be effectively locked up in mineral phases, and how quickly they can be re-released upon change in fluid chemistry. Our research makes extensive use of Nuclear Magnetic Resonance (NMR) spectroscopic techniques to determine the the molecular-level structure of minerals and their surfaces, and for measuring kinetics of reactions for dissolved complexes. We are particularly interested in determining the structure of impurities in minerals, such as organic molecules, as models for how these ions and molecules bind to mineral surfaces. Our research group is affiliated with theCenter for Environmental Molecular Science (CEMS), which is a collaboration among researchers at Stony Brook, Brookhaven National Laboratory, Penn State University, and Temple University.

Kinetics of Oxygen Exchange Reactions
Structural and chemical properties of mineral surfaces provide some of the most fundamental constraints on reactions that result in mass transfer between solid and fluid phases, such as sorption, coprecipitation, crystal growth, and dissolution . Fundamental processes at mineral surfaces are difficult to study directly because of the heterogeneous nature of the mineral surface and of the surface/fluid interface.An alternative approach is to study dissolved complexes that contain structural elements similar to those thought to occur on exposed mineral surfaces. One class of molecules that fit this description are the Al-oxyhydroxide polymers based on the Al13 molecule: 


These molecules contain a central 4-coordinated metal (Al, Ga, or Ge) surrounded by a shell of 12 6-coordinated Al in edge-sharing configurations similar to the structure of Al-hydroxide and 1:1 clay minerals. This molecule exposes oxygens in bridging (bonded to two Al) and terminal configurations similar to those expected for simply terminated crystals and exhibits charge densities similar to those of Al-oxyhyroxides at near-neutral to slightly acidic conditions. The rates at which these oxygens exchange with oxygens in the bulk solution can be measured in situ by 17O-NMR techniques, giving time scales for bond-breaking reactions and how they change with change in chemistry. For example, we have found that substitution of fluoride ion onto an oxygen site makes the other oxygens more reactive by a factor of 100.

Nuclear Magnetic Resonance (NMR) Spectroscopy 
NMR spectroscopy can provide information on the structure of minerals in terms of the distribution of distinct atomic configurations and complements techniques, such as X-ray diffraction, that yield average atom positions. The structural information from NMR is related to the immediate coordination environment of the atom of interest and is isotopically specific. This makes NMR very useful for disordered materials such as amorphous (non-crystalline) phases and mineral surfaces, where the structure varies over short (nm) distance scales. For example, the white precipitate in this image is an amorphous aluminum-oxyhydroxide that results from neutralization of acid mine drainage in a stream: 

Oxyhydroxide flocs of Fe (orange) and Al (white) formed at a stream-bed spring of acid mine water. Yuba county, California.

Using 27Al NMR spectroscopy we could determine the distribution of Al coordination environments, which provided information on the precursor molecules from which the precipitate probably forms.


Our group maintains a 400 MHz Varian Inova NMR spectrometer equipped with sample probe assemblies for experiments on a wide range of solid materials. A new wide-bore 500 MHz spectrometer for solid-state materials research was installed in 2004, and which is shared with the group of Prof. Clare Grey (Dept. of Chemistry, SUNY Stony Brook). We also use high-field spectrometers (600 and 700 MHz) in the Stony Brook Keck NMR Center for Structural Biology. Currently we are using solid-state NMR methods to study a variety of minerals, glasses, and mineral surfaces.

 


Selected Publications

Phillips, B.L., Houston, J.R., Feng, J., and Casey, W.H. (2006) Observation of 103Rh NMR by cross-polarization.  J. Am. Chem. Soc., in press

Casey, W.H., Olmstead, M.M., and Phillips, B.L. (2005)  A new aluminum-hydroxide octamer.  Inorg. Chem., 44:4888-4890.

Phillips, B.L., Lee, Y.J., Reeder, R.J. (2005) Organic coprecipitates with calcite: an NMR spectroscopic study.  Env. Sci. Technol.,  39:4533-4539.

Swaddle, T.W., Rosenqvist, R., Yu, P.,  Bylaska, E., Phillips, B.L., Casey, W.H. (2005), Kinetic evidence for five-coordination in AlOH2+(aq) ion.  Science, 208:1450-1453.

Tangeman, J.A., Phillips, B.L., Nordine, P.C., and Weber, J.K.R. (2004) Thermodynamics and structure of single- and two-phase yttria-alumina glasses.  J. Phys. Chem. B, 108:10663-10671.

Loring, J.; Yu, P.; Phillips, B.L.; Casey, W.H. (2004) Activation volumes for oxygen exchange between the GaO4Al12(OH)24(H2O)127+(aq) (GaAl12) polyoxocation and aqueous solution from variable pressure 17O NMR spectroscopy.  Geochim. Cosmochim. Acta, 68:2791-2798.

Phillips, B.L., Lee, A.P., and Casey, W.H. (2003)  Rates of oxygen exchange between the Al2O8Al28(OH) 56(H2O)2418+ (aq) (Al30) molecule and aqueous solution. Geochim. Cosmochim. Acta,67:2725-2733.

Yu, P., Lee, A., Phillips, B.L., and Casey, W.H. (2003) Potentiometric and 19F nuclear magnetic resonance spectroscopic study of fluoride substitution in the GaAl12 polyoxocation:  Implications for aluminum (hydr)oxide mineral surfaces. Geochim. Cosmochim. Acta, 67:1065-1080.

Furrer, G., Phillips, B.L., Ulrich, K.-W., Pothig, R., and Casey, W.H. (2002) The origin of aluminum flocs in polluted streams.  Science297:2245-2247.

Lee A.P., Phillips B.L., Olmstead M.M., Casey W.H. (2001)  Synthesis and characterization of the GeO4Al12(OH)24(OH2)128+  polyoxcation. Inorg. Chem.,  40:4485-4487.

Tangeman, J.A., Phillips, B.L., Navrotsky, A., and Weber, J.K.R. (2001) Vitreous forsterite (Mg2SiO4):  Synthesis, structure, and thermochemistry.  Geophys. Res. Lett.28:2517-2520.

Casey W.H., and Phillips, B.L. (2001)  The kinetics of oxygen exchange between sites in the GaO4Al12(OH)24(OH2)127+ (aq)  molecule and aqueous solution.   Geochim. Cosmochim. Acta,65:705.

Phillips, B.L., Casey, W.H., and Karlsson, M. (2000)  Bonding and reactivity at oxide mineral surfaces from model aqueous complexes. Nature404:379-382.

Nordin, J.P., Sullivan, D.J., Phillips, B.L., and Casey, W.H. (1999)  Mechanisms for F-promoted dissolution of Bayerite [b-Al(OH)3(s)] and Boehmite [g-AlOOH]: 19F NMR spectroscopy and experimental surface chemistry. Geochim. Cosmochim. Acta 63:3513-3524.

Phillips, B.L., Xu, H., Heaney, P., and Navrotsky, A. (2000)  29Si and 27Al MAS-NMR spectroscopy of b-eucryptite (LiAlSiO4): the enthalpy of Si,Al ordering. Am. Mineral., 85:181-188.

News & Announcements 

Dr. Michael Gurnis will be delivering a lecture entitled "Plate Tectonics: From Initiation of Subduction to Global Plate Motions" on Thursday, 3/26/15 at 4:00pm in the Hanson Seminar Room (ESS 123).

Geosciences Seminars

Geosciences Department Newsletter

**************

Melissa Sims chosen to introduce Secretary of Energy at NSLS-II Dedication

Celebrating Robert Cooper Liebermann
 

Professor Joel Hurowitz named Deputy PI for Mars 2020 Rover Instrument

PhD Student Yuyan (Sara) Zhao selected for Prestigious Dwornik Award

Professor Timothy Glotch to lead NASA funded research team

Professor Martin Schoonen named Chairman of the Environmental Sciences Department at BNL

Professors John Parise and Artem Oganov pursue Materials Genome Initiative

Professor Deanne Rogers finds evidence for past groundwater on Mars

Professor Robert Liebermann accepts Edward A. Flinn Award

Professor Scott McLennan selected for NASA's Mars Science Laboratory Team

Professor Timothy Glotch receives NSF Career Award

Geosciences PhD Francis McCubbin receives Presidential Early Career Award

Professor Scott McLennan on NASA team that finds new evidence for water at Mars crater

Geoscience Researchers Develop Numerical Model to Better Forecast Forces Behind Earthquakes 

Geoscience Professor Don Weidner selected to receive Inge Lehman Medal

Geoscience researchers find that natural minerals disinfect drinking water

Professor Dan Davis publishes 4th edition of "Turn Left at Orion"

Stony Brook PhD and Faculty Advisor Show that the Moon Isn't as Dry as Previously Thought

The Department welcomes its new faculty member, Deanne Rogers

Jerome Varriale, Geosciences major, Named URECA Researcher of the Month  

 

Department of Geosciences - Earth and Space Science Building, Stony Brook, NY 11794-2100  Phone: (631) 632-8200
Login to Edit