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Mitsui-7, Heat-Treated, And Nitrogen-Doped Multi-Walled Carbon Nanotubes Elicit Genotoxicity In Human Lung Epithelial Cells, Katelyn J. Siegrist, Steven H. Reynolds, Dale W. Porter, Robert R. Mercer, Alison K. Bauer, David Lowry, Lorenzo Cena, Todd A. Stueckle, Michael L. Kashon, John Wiley, Jeffrey L. Salisbury, John Mastovich, Kristin Bunker, Mark Sparrow, Jason S. Lupoi, Aleksandr B. Stefaniak, Michael J. Keane, Shuji Tsuruoka, Mauricio Terrones, Michael Mccawley, Linda M. Sargent
Mitsui-7, Heat-Treated, And Nitrogen-Doped Multi-Walled Carbon Nanotubes Elicit Genotoxicity In Human Lung Epithelial Cells, Katelyn J. Siegrist, Steven H. Reynolds, Dale W. Porter, Robert R. Mercer, Alison K. Bauer, David Lowry, Lorenzo Cena, Todd A. Stueckle, Michael L. Kashon, John Wiley, Jeffrey L. Salisbury, John Mastovich, Kristin Bunker, Mark Sparrow, Jason S. Lupoi, Aleksandr B. Stefaniak, Michael J. Keane, Shuji Tsuruoka, Mauricio Terrones, Michael Mccawley, Linda M. Sargent
Lorenzo Cena
Background: The unique physicochemical properties of multi-walled carbon nanotubes (MWCNT) have led to many industrial applications. Due to their low density and small size, MWCNT are easily aerosolized in the workplace making respiratory exposures likely in workers. The International Agency for Research on Cancer designated the pristine Mitsui-7 MWCNT (MWCNT-7) as a Group 2B carcinogen, but there was insufficient data to classify all other MWCNT. Previously, MWCNT exposed to high temperature (MWCNT-HT) or synthesized with nitrogen (MWCNT-ND) have been found to elicit attenuated toxicity; however, their genotoxic and carcinogenic potential are not known. Our aim was to measure the genotoxicity …
Electrical Conductivity, Impedance, And Percolation Behavior Of Carbon Nanofiber And Carbon Nanotube Containing Gellan Gum Hydrogels, Holly Warren, Reece Gately, Peter O'Brien, Robert Gorkin Iii, Marc In Het Panhuis
Electrical Conductivity, Impedance, And Percolation Behavior Of Carbon Nanofiber And Carbon Nanotube Containing Gellan Gum Hydrogels, Holly Warren, Reece Gately, Peter O'Brien, Robert Gorkin Iii, Marc In Het Panhuis
Robert Gorkin III
The electrical impedance behavior of gellan gum (GG), GG-carbon nanotube, and GG-carbon nanofiber hydrogel composites is reported. It is demonstrated that the impedance behavior of these gels can be modeled using a Warburg element in series with a resistor. Sonolysis (required to disperse the carbon fillers) does not affect GG hydrogel electrical conductivity (1.2 ± 0.1 mS/cm), but has a detrimental effect on the gel's mechanical characteristics. It was found that the electrical conductivity (evaluated using impedance analysis) increases with increasing volume fraction of the carbon fillers and decreasing water content. For example, carbon nanotube containing hydrogels exhibited a six- …