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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Synthesis Of Nano-Structured Monoclinic W03 Particles, Zhixiang Lu
Synthesis Of Nano-Structured Monoclinic W03 Particles, Zhixiang Lu
Electronic Theses and Dissertations
The goal of this research is: 1) to develop synthetic methods for generating nanosized particles of monoclinic W03 (m-W03) and 2) to use the high surface area of the nano-sized material in infrared spectroscopic studies of the reactions of gaseous molecules with the particulate surface. Two methods of making nano-structured monoclinic tungsten trioxide (m-W03) particles are investigated. In one method, the sol formation occurs in the presence of a solution containing chelating agents and in a second approach, the sol formation occurs in a water-in oil emulsion. Commercial m-W03 particles are approximately 1 micron …
Computer Simulations Of Confined Systems, Jayendran C. Rasaiah
Computer Simulations Of Confined Systems, Jayendran C. Rasaiah
University of Maine Office of Research Administration: Grant Reports
Jayendran Rasaiah of the University of Maine is supported by an award from the Theoretical and Computational Chemistry program with partial funding provided by the Experimental Program to Stimulate Competitive Research for the development of computational methods to simulate water and other solvents in confined systems, such as carbon nanotubes and the interior of proteins. Other systems which are being studied include capillary evaporation of water between hydrophobic plates, water near surfaces and water between charged membranes. The development of better water potentials for a variety of applications is a major goal of the research. Rasaiah is also developing efficient …
Photostabilization Of High-Yield Pulps Reaction Of Thiols And Quinones With Pulp, Jonathan Spender
Photostabilization Of High-Yield Pulps Reaction Of Thiols And Quinones With Pulp, Jonathan Spender
Electronic Theses and Dissertations
Some thiols have been shown to be efficient in both bleaching and stabilizing the brightness of mechanical pulps. Two thiols, thioglycerol and glycol dimercaptoacetate, have received considerable attention due to their photostabilization effects. Their reactions with 1,4-benzoquinone, a model lignin compound, were investigated. In the first part of this study, reaction products were isolated using preparative HPLC and were fully characterized using GC-MS as well as l3C-NMR Both thiols were found to undergo Michael addition with the model quinone (in methanol) to yield a substituted hydroquinone. Further reaction with excess quinone in the presence of UVlight facilitated subsequent redox …
Synthesis And Reactivity Of Gold Thiolate Cluster Complexes, Hanan Abdou
Synthesis And Reactivity Of Gold Thiolate Cluster Complexes, Hanan Abdou
Electronic Theses and Dissertations
Chemical oxidation of dinuclear gold(I) thiolates of the formula LLAu2(SC6H4CH3)2 [LL= dppp, bis(dipheny1phosphine)propane and dppb, bis(dipheny1phosphine)butane] and dinuclear gold(I) thiolate complexes with bridging a propane dithiolate ligand of the formula LLAu2(SC3H6S) [LL = dppp and dppb] was carried out using the mild oxidizing agent, ferrocenium, [Cp2Fe]PF6). Spectroscopic studies and elemental analysis showed the formation of gold(I) clusters, disulfide, and ferrocene as products of this oxidation reaction. The clusters, [(dppp)AU2(SC6H4CH3)](PF6) and [(dppb)Au2(SC …
Grading The General Chemistry Laboratory: A Constructivist Approach., Barbara Stewart
Grading The General Chemistry Laboratory: A Constructivist Approach., Barbara Stewart
Electronic Theses and Dissertations
Constructivist theories of learning posit that instructors cannot transfer their knowledge to students; students must actively construct their own understanding. The Inter-Chem-Net project uses technology and instrumentation to provide an individualized experience within the large general laboratory course, effectively establishing a constructivist methodology. A grading rubric was developed to communicate course expectations and provide an easy and reliable method of evaluating student work in the general chemistry laboratory. The grading rubric separates the learning outcomes into a checklist of skills associated with each particular grade. This checklist provides detailed feedback for individualized choices of experiments, a key component of the …