Thursday, June 26, 2008 - 2:10 PM South American AB (Capital Hilton) 166
Synthesis of Nanophase Mn(VII) Oxide Using Green Technology and Its Applications
R. K. Vempati, Southern Methodist University, Dallas, TX, Gajanan Bhat, University of Tennesse at Knoxville, Knoxville, TN, and Richard Wagner, PhycoBiologics, Inc., Indianapolis, IN.
The innovation focuses on the formation and stabilization of innovative nanophase Mn(VII) oxide (NM7O) using 1,4-phenelynediamine (PDA). The starting material is a beige-colored hydrated Mn(II) mineral which upon addition of PDA forms a violet-colored NM7O. The mechanisms of formation appear to be oxidation of PDA to 1,4-benzoquinone in the presence of air resulting in oxidation of the hydrated Mn(II) mineral to NM7O. The SEM analysis showed globular NM7O mass with particle size ranging from 50 to 100 nm, and cyclic voltammetry and optical spectroscopy confirmed the Mn7+ oxidation state. Based on laboratory studies, NM7O is a super Lewis acid in that it attacks compounds with lone pairs of electrons, e.g. cyclohexylamine and cyclohexanone. Additionally, neutralize chemical warfare agents (CWAs) surrogates, e.g., 2-chloroethyl ethylsulfide (CEES-mustard gas analog) and dimethyl methyphosphonate (DMMP-sarin gas analog). The applications developed are: 1) odor removal from N and S bearing compounds, 2) metal polish, 3) disulfide syntheses using thiol groups, and 4) algaecide and bactericide formulations. Also, the violet-colored NM7O after reduction changes to environmentally safe brown-colored Mn(IV) oxide, and this property can be exploited to develop an optical sensor. The NM7O has been successfully coated/impregnated into non-woven and melt blown fabrics. These fabric materials can be incorporated into clothing, wipes and liners for odor control, algae and bacterial growth control and destruction, metal polish, toxic spills, decontamination, and diapers, hospital beds, incontinence, undergarments for soldiers and astronauts for odor removal and prevent bacterial growth. The NM7O manufacturing technology has received a US patent, a patent is pending on chemical warfare agents' destruction, and two provisional patents filed on NM7O coated fabrics and destruction of nuisance and pathogenic microorganisms. Green technologies relating to domestic, industrial, healthcare, hygiene and military and homeland security applications are being developed.