- New Renishaw InVia Raman microscope up and running! More details on the website soon.
- Interested in joining an XRD or Raman user workshop? Send contact us and we'll put you on the notification list.
- Megan and Charity participated in 6 presentations at the Lunar and Planetary Science conference in Woodlands, TX.
- Rebecca represented OU at the Oklahoma State Capitol on Science Day with a poster presentation comparing weathering of grain size fractions from sediments collected in various climate regimes. Thanks for making us proud, Rebecca!
- Andy was invited to speak at the EPA's national groundwater research lab in Ada, OK. Several group members went along to discuss potential student internship and job opportunities. Andy presented a summary of Jeff, Molly, Sarah, and Virginia's work on chromium in the Central Oklahoma Aquifer
- Megan, Lynn Soreghan, and Young Ji finished their first tour of field sites this year for their NSF chemical weathering project, with stops in Antarctica, Norway, the California desert, and Puerto Rico. Exciting results forthcoming!
- Andy gave an invited talk at the National Academy of Science Roundtable for Mesoscale Chemistry, hosted at the Swedish Embassy in Washington, D.C.
Physical and planetary geochemistry
Stubbeman-Drace Presidential Professor
Nanoscale geosience and low-temperature geochemistry
Deep time signatures of rock weathering
Ph.D. (geology), 2013, Northwestern
Dissolution in brines
Ph.D. (geology), 2014, University of Kansas
KRISTEN MARRA, Ph.D. student (co-advised with Lynn Soreghan)
Physical and Chemical Weathering in Alluvial Systems of the McMurdo Dry Valleys, Antarctica
MOLLY SEXTON, M.S. student
Stratigraphic and Textural Analysis of Nanodiamonds Across the Younger Dryas Boundary in Sediments of Western Oklahoma
JEFF WESTROP, M.S. student
The geochemistry of chromum in the Central Oklahoma Aquifer- Norman, OK
Deep time signatures of rock weathering.
Thermodynamic modeling of barite hashemite solid solutions in the Central Oklahoma Aquifer.
SARAH VAN DEVENTER
|Where they are now|
|Dan Ambuehl (M.S.)||EOG Resources, Oklahoma City|
|Debajyoti Basu Sarkar (M.S.)||just finished|
|Xiaofeng Chen (Ph.D.)||postdoctoral researcher, UT-Austin BEG|
|Emily Dixon (M.S.)||Scientist, National Energy and Technology Laboratory|
|Seth Gainey (M.S.)||Ph.D. program, UNLV|
|Matt Kendall (M.S.)||Associate Geologist, DeGolyer and MacNaughton|
|Matt Miller (M.S.)||Geologist, J.M. Waller and Associates, Inc.|
|Sumudu Munasinghe (M.S.)||Geochemist, Chesepeake Energy, Oklahoma City OK|
|Brittany Pritchett (M.S.)||Scientist, Oklahoma Geological Survey|
|Margaret Root (M.S.)||Awesome Mom|
|Allison Stumpf (M.S.)||Apache (Midland, TX)|
|Andrew Swindle (Ph.D.)||Assistant Professor, Wichita State University|
ATOMIC ABSORPTION SPECTROSCOPY: Our PerkinElmer AAnalyst 800 combines flame and furnace atomization capability in a single instrument to provide elemental analysis of liquid samples. The absorbance of unknown samples at an appropriate wavelength is compared with the absorbance of known standard solutions. We have lamps for most elements of interest in the Earth and environmntal sciences. The furnace is transversely heated and utilizes Zeeman background correction. Contact one of the Elwood Maddens to inquire about the appropriateness of flame or furnace for your samples.
ATOMIC FORCE MICROSCOPY: The Pacific Nanotechnology NanoR2 is designed to probe the nanometer-scale topographic, physical, electronic, and magnetic properties of surfaces.
GAS ADSORPTION ANALYSIS (BET surface area and pore size distribution): Gas adsorption analysis for surface area and pore size distribution (Quantachrome Nova 2000e) of powdered samples.
POWDER X-RAY DIFFRACTION (XRD): Dr. A. Elwood Madden oversees the powder X-ray diffractometer (Rigaku Ultima IV) in the Devon Energy NanoLab. We have updated reference databases and software such as MDI Jade2010, PDXL, and ClaySim.
RAMAN MICROSCOPY: Our new Renishaw InVia scanning Raman microscope was installed in Jan. 2015! Featuring 532nm and 785nm lasers, this is a great method for spot and mapping analyses of a range of materials. A linkham heating/cooling stage allows the collection of temperature-dependent spectra.
UV-VISIBLE SCANNING ABSORPTION SPECTROPHOTOMETRY: Thermo Scientific Genesys 6.
WATER ULTRAPURIFICATION SYSTEM: Barnstead Nanopure UV
Other equipment includes:
- anaerobic chamber
- analytical balances
- geochemical thermodynamic and reaction path modeling software (Geochemist’s Workbench)
- geochemical reactors of various types
- pH meters and electrodes
Additionally, we have expertise in techniques such as the following which are readily available at OU or elsewhere:
Kinetic Phosphorescence Analysis (KPA), Scanning Electron Microscopy (SEM), Surface (zeta) potential measurement, synchrotron x-ray spectroscopy, Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Fluid Inclusion Analysis.
We also have access to many other types of geochemistry facilities, as found on the GEOCHEMISTRY at OU website