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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Effects Of Preparative Parameters On The Structure And Performance Of Ca-La Metal Oxide Catalysts For Oil Transesterification, Shuli Yan, Manhoe Kim, Siddharth Mohan, Steven O. Salley, K.Y. Simon Ng
Effects Of Preparative Parameters On The Structure And Performance Of Ca-La Metal Oxide Catalysts For Oil Transesterification, Shuli Yan, Manhoe Kim, Siddharth Mohan, Steven O. Salley, K.Y. Simon Ng
National Biofuels Energy Laboratory
The effects of preparative parameters on the surface basicity, composition, and transesterification activities of several Ca-La metal oxide catalysts were investigated. Four different preparation methods: ammonia-ethanol-carbon dioxide precipitation, physical mixing, impregnation, and co-precipitation, were studied. It was found that the ammonia-ethanol-carbon dioxide precipitation method resulted in the highest BET specific surface area, base strength and base site concentration. Moreover, catalyst surface composition and basicity are a function of calcination temperature, precipitants, pH, and molar ratio of Ca to La in precursor solution, and storage conditions. XRD, XPS, basicity and BET tests revealed that catalyst structure and dispersion of Ca species …
Supercritical Carbon Dioxide Processing Of Nano - Clays And Polymer/Clay Nanocomposites, Mihai Manitiu
Supercritical Carbon Dioxide Processing Of Nano - Clays And Polymer/Clay Nanocomposites, Mihai Manitiu
Wayne State University Dissertations
Effective dispersion of the fillers in a polymer matrix and improvement of polymer-clay interactions are two key challenges in the field of nanocomposites. A novel processing method that utilizes the unique properties of supercritical carbon dioxide (scCO2) to disperse nano-clay and prepare a series of polymer/clay nanocomposites with enhanced properties was explored.
Significant dispersion was achieved using the scCO2 process with Cloisite 10A without the presence of an organic phase as evident by the absence of the diffraction peak in WAXD and the presence of individual tactoids that lost their parallel registry. The expanded flexible structure of the scCO2 processed …
Design Of A Polysaccharide Derived Tissue Engineered Vascular Graft, Irina Robu
Design Of A Polysaccharide Derived Tissue Engineered Vascular Graft, Irina Robu
Wayne State University Dissertations
DESIGN OF A POLYSACCHARIDE DERIVED TISSUE ENGINEERED VASCULAR GRAFT
By
Irina Robu
November 2010
Advisor: Dr. Howard Matthew
Major: Chemical Engineering
Degree: Doctor of Philosophy
As the most frequent congenital anomaly and the leading cause of death, congenital heart disease is an attractive target for tissue engineering research. The challenging target to engineer a native blood vessel stems from the need to find substitutes for pediatric patients born with congenital defects. The tissue engineering graft functions to bring various cells of the vasculature in close proximity to one another to enable intercellular signaling which facilitates cell adhesion, migration and differentiation. …
Electroless Deposition Of Superconducting Magnesium Diboride Thin Films On Various Substrates, Khrupa Saagar Vijayaragavan
Electroless Deposition Of Superconducting Magnesium Diboride Thin Films On Various Substrates, Khrupa Saagar Vijayaragavan
Wayne State University Theses
ABSTRACT
ELECTROLESS DEPOSITION OF SUPERCONDUCTING MAGNESIUM DIBORIDE THIN FILMS ON VARIOUS SUBSTRATES
by
KHRUPA SAAGAR VIJAYARAGAVAN
MAY 2010
Advisor: Dr. Susil K Putatunda
Dr. Gavin Lawes
Major: Chemical Engineering
Degree: Masters of Science
Superconducting thin films of magnesium diboride were synthesized by a novel electroless plating process. Electroless plating shares many similarities to electroplating with the major difference being the absence of a continuous bias voltage. Significantly, this work represents the first investigation where electroless deposition has been used to prepare compounds, as opposed to the elemental metals considered in all previous studies. Magnesium Diboride is a recently discovered superconducting …
Molecular Modeling Of Energetic Materials And Chemical Warfare Agents, Nandhini Sokkalingam
Molecular Modeling Of Energetic Materials And Chemical Warfare Agents, Nandhini Sokkalingam
Wayne State University Dissertations
Contamination of military sites by energetic materials and chemical warfare agents is a growing problem. To avoid health hazards associated with these compounds, it is necessary to decontaminate or remediate the contaminated sites. Effective decontamination requires knowledge of environmental fate of contaminants and the appropriate remediation methodologies. While the fate of chemical warfare agents are well studied, the impact of certain energetic materials in the environment is relatively unknown. So the current focus is determining environmental fate of Insensitive Munitions (IM) which are energetic materials that have low shock sensitivity and high thermal stability and developing detection schemes for identifying …