Dr. Johnson recently graduated from Stanford University with a Ph.D. in Chemical Engineering and has 6 years of experience in experimental, low-temperature, aqueous geochemistry. Her graduate research focused on subsurface carbon storage in mafic and ultramafic rocks. She has experience with a variety of analytical techniques, including gas chromatography (GC-MS), scanning and transmission electron microscopy (SEM, TEM), isotopic measurement (ICP-MS), and high resolution ion microprobe analysis (SHRIMP-RG).
As a Ph.D. candidate, Dr. Johnson designed and completed experiments at elevated temperature and pressure of durations up to 6 months in order to simulate conditions that might define subsurface carbon storage. Solid phases from the experiments were analyzed using several high resolution techniques (SEM, TEM, SHRIMP-RG) in order to measure chemical gradients and crystal transformations at the nanoscale. These data were then combined with aqueous phase measurements to constrain a mechanistic model describing dissolution of the primary mineral (forsterite). Other projects that she has been involved with include an investigation of redox changes induced by CO2 injection to the subsurface, sample preparation for TEM analysis of thin film alloys, experimental investigations of basalt as a potential alkalinity source for mineral carbonation, and production of experimental samples used to calibrate a clumped isotope thermometer for magnesite.
CREDENTIALS & PROFESSIONAL HONORS
- Ph.D., Chemical Engineering, Stanford University, 2014
- M.S., Chemical Engineering, Stanford University, 2010
- B.S., Chemical Engineering, Brown University, 2008, honors
Johnson N, Thomas B, Maher K, Rosenbauer R, Bird D, Brown G. Olivine dissolution and carbonation under conditions relevant for in situ carbon storage. Chemical Geology 2014; 373:93–105.
Lee B, Sarin L, Johnson NC, Hurt RH. A nano-selenium reactive barrier approach for managing mercury of the life-cycle of compact fluorescent lamps. Environmental Science and Technology 2009; 43:15:5915–5920.
Johnson NC, Manchester S, Sarin L, Kulaots I, Gau Y, Hurt RH. Mercury vapor release from broken compact fluorescent lamps and in situ capture by new nanomaterial sorbents. Environmental Science and Technology 2008; 42(15):5772–5778.
Johnson NC, Maher K, Thomas B, Rosenbauer RJ, Bird DK, Brown GE. Uptake of isotopic spike by Si-rich alteration layer during olivine dissolution. Oral presentation, Goldschmidt Conference, Sacramento, CA, 2014.
Johnson NC, Maher K, Bird DK, Brown GE. Composition, formation, and role of the Si-rich surface layer during olivine dissolution. Oral presentation, Goldschmidt Conference, Florence, Italy, 2013.
Johnson NC, Thomas B, Maher K, Bird DK, Rosenbauer RJ, Brown GE. Formation of the Si-rich layer on olivine surfaces during carbonation under in-situ conditions. Poster Presentation, Goldschmidt Conference, Montreal, Canada, 2012.
Maher K, Johnson NC, Kharaka Y, Brown GE, Kang S-H, Rosenbauer RJ, Bird DK, Garcia Del Real P, Thomas B. The reactivity of CO2 in the subsurface. Oral presentation, USGS CO2 Sequestration in Unconventional Reservoirs Workshop, West Virginia, 2012.
Johnson NC, Thomas B, Rosenbauer RJ, Maher K, Brown GE. Effect of a Si-rich layer on olivine carbonation under in-situ conditions. Poster presentation, American Geophysical Union Fall Meeting, San Francisco, CA, 2011.
Johnson NC. CO2 sequestration using direct mineral carbonation of Mg-silicates. Oral presentation, Global Climate and Energy Project Annual Research Symposium, Stanford, CA, 2011.
Johnson NC, Thomas B, Maher K, Bird DK, Rosenbauer RJ, Brown GE. Adsorption of organic ligands on silicate mineral surfaces in the presence of CO2 and water: Insight into olivine dissolution rates. Oral presentation, Goldschmidt Conference, Prague, Czech Republic, 2011.
Johnson NC, Thomas B, Maher K, Bird DK, Rosenbauer RJ, Brown GE. Kinetics of olivine carbonation for the geologic storage of carbon dioxide. Poster presentation, Geological capture and storage in mafic and ultramafic rocks: IDOP/ICDP Workshop on the role of oceanic and continental scientific drilling, Muscat, Oman, 2011.
Johnson NC, Westfield I, Lu P, Bourcier W, Kendall T. Basalt as a solid source of calcium and alkalinity for the sequestration of carbon dioxide in building materials. Poster presentation, American Geophysical Union Fall Meeting, San Francisco, CA, December 2010.
Johnson NC, Thomas B, Maher K, Kendelewicz T, Bird DK, Rosenbauer RJ, Brown GE. Kinetics of Mg-silicate carbonation for the geologic storage of carbon dioxide. Oral presentation, American Chemical Society National Meeting, San Francisco, CA, 2010.
Johnson NC, Thomas B, Maher K, Kendelewicz T, Bird DK, Rosenbauer RJ, Brown GE. Kinetics of olivine carbonation at 60°C and 100 bar. Poster presentation, Geological Society of America Annual Meeting, Portland, OR, 2009.
Johnson NC, Hurt RH. The characterization and capture of mercury released from broken fluorescent light bulbs. Poster presentation, American Institute of Chemical Engineers Annual Meeting, Salt Lake City, UT, 2007.
American Chemical Society
American Geophysical Union
Journal of Alloys and Compounds
Geochimica et Cosmochimica Acta