Research by Stephen A. Hackney, Professor, Materials Science and Engineering, Michigan Technological University.
Imaging by Pinaki Mukherjee, Staff, Materials Science and Engineering, Engineer/Scientist, Applied Chemical and Morphological Analysis Laboratory (ACMAL).
Instrument: FEI 200kV Titan Themis S-TEM in ACMAL’s Electron Optics Facility.
Scale bar indicates 500 nm.
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Supercritical carbon dioxide is used to exfoliate graphite, producing a small, several-layer graphitic flake. The supercritical conditions of 2000, 2500, and 3000 psi and temperatures of 40°, 50°, and 60°C, have been used to study the effect of critical density on the sizes and zeta potentials of the treated flakes. Photon Correlation Spectroscopy (PCS), Brunauer-Emmett-Teller (BET) surface area measurement, field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM) are used to observe the features of the flakes.
Wattanaprayoon, Chaiyaporn, “Graphite exfoliation by supercritical carbon dioxide extraction”, Master’s Thesis, Michigan Technological University, 2011.
HLF 1 taken with SEM. Eutectic crystallization texture in iron silicides from a fulgurite from lower Michigan (lightning strike glass). Submitted by Christopher Stefano, Associate Curator, A. E. Seaman Mineral Museum.