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Theses/Dissertations

Chemical engineering

Retrospective Theses and Dissertations

Physical Sciences and Mathematics

2001

Articles 1 - 2 of 2

Full-Text Articles in Engineering

Investigation Of The Peroxovanadate Sol-Gel Process And Characterization Of The Gels , Craig Joseph Fontenot Jan 2001

Investigation Of The Peroxovanadate Sol-Gel Process And Characterization Of The Gels , Craig Joseph Fontenot

Retrospective Theses and Dissertations

Vanadium oxide gels derived from aqueous solution of V2O 5 and H2O2 have been investigated using in situ 51V NMR and laser Raman spectroscopic techniques. On the basis of this characterization, a pathway for peroxovanadate decomposition has been proposed, including the presence of two peroxovanadate dieters. New Raman bands and assignments for these species are reported. Experimental 51V NMR evidence suggested the VO2+ species was directly involved in the formation of the gel. The vanadia xerogels were studied using 51V and 17O MAS NMR, 17 O 3QMAS NMR, TGA, DSC, XRD, SEM and laser Raman spectroscopy. Based primarily on the ...


Study Of Transport And Dissolution Of A Nonaqueous Phase Liquid In Porous Media: Effects Of Low-Frequency Pulsations And Surfactants , Mirrya Mosier Fontenot Jan 2001

Study Of Transport And Dissolution Of A Nonaqueous Phase Liquid In Porous Media: Effects Of Low-Frequency Pulsations And Surfactants , Mirrya Mosier Fontenot

Retrospective Theses and Dissertations

The transport and dissolution of residual non aqueous phase liquids (NAPLs) trapped in water saturated porous media is a problem pertinent to both environmental and petrochemical industries. In this work we have quantitatively examined the complete dissolution of residual entrapped NAPL at the pore-scale in three dimensions using refractive index matching techniques along with planar laser induced fluorescence. The results yielded pore-scale information regarding ganglia volume, surface area, and position over time at various Capillary numbers. We found that with increasing Capillary numbers, the time for total dissolution decreased. In addition, it appears that large ganglia exhibit fractal area to ...