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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"UV-VIS spectrophotometry"”.
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Mechanism-Guided Studies of Brønsted Acid and Base Organocatalysis
… of pH-rate profiles for hydrolysis using UV-Vis spectrophotometry. Estimates of the second-order rate constant for acid-catalysed hydrolysis (kH, M-1s-1) and the first-order rate constant for the solvent reaction (k0, s-1) for each imine were extracted from the rate-profiles, however, pKa …
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UV stabilisation of poly(ethylene terephthalate)
… this project was to design novel polymerisable UV absorbers which successfully protect PET from UV degradation for a longer duration of time compared to non-polymerisable UV stabilising additives. The polymerisable UV stabilisers for PET were synthesised using cyanuric chloride as a synthetic …
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Effect of Carbonaceous Nanoparticles on Naturally Occurring Iron Reduction by Carboxylates
… were determined colorimetrically using UV-Vis spectrophotometry, while oxalate was quantified by Ion Chromatography (IC). Results indicate that CNPs enhances the production of Fe(II) from Fe(III)-oxalate by a factor of 2 in dark and 5 in light experiments. The maximum fractional iron …
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Evaluation of Triclosan Reactivity in Monochloraminated Waters
… in the absence of triclosan using UV-VIS spectrophotometry. Experimental results showed that the monochloramine auto-decomposition intermediates, free chlorine and dichloramine, are responsible for a majority of the observed triclosan decay and product formation. A kinetic model for …
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Development of a high-throughput phenotyping method for measuring sorghum carotenoids
… a high-throughput phenotyping (HTP) method using UV-VIS spectrophotometry can identify high carotenoid sorghum lines for selection during breeding. In this study, a simple and rapid method for carotenoid extraction and UV-VIS spectrophotometric detection in a 96-well plate format was developed and …
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Magnetoacoustic chemical sensors based on swellable polymer microspheres
… The magnetoacoustic sensor was used to monitor viscosity of starch solution, water loading, and 2-hydroxyethyl methacrylate polymerization.</p><p>Poly(vinylbenzyl chloride) (polyVBC) microspheres were prepared by suspension polymerization and then derivatized to introduce dicarboxylate groups …
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The evaluation of the specificity of the Acid Phosphatase test to identify semen
… the enzyme kinetics using a novel method: UV-Vis spectrophotometry. Reaction kinetics showed a significant difference in the AP activity between humans and each of the four different animal species in this study (p < 0.001). Confirmatory testing was also performed using microscopy and …
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Inhibitory effects of Green synthesized Senna alexandrina silver nanoparticles (SAAgNPs) on Escherichia coli DnaK
… synthesized SA-AgNPs were characterized using UV- VIS spectrophotometry, FTIR, and SEM analysis. Furthermore, heat shock proteins (Hsp) are cellular and stress-induced proteins. With respect to this, it is anticipated that the Hsp can also interact with AgNPs transported into cells and/or the …
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Development of dermally absorbed copper(ii) complexes as potential anti-inflammatory drugs
… and their solution structure studied using UV-Vis spectrophotometry, CW-EPR spectroscopy, 1H NMR, ESI-MS and molecular modelling calculations. The presence of sarcosine did not significantly affect the stability of the complexes. Several species were found to exist in solution depending on …
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Investigation of Rhenium's Biogeochemistry
… and tri- thioperrhenates were never observed, by UV-Vis spectrophotometry. The stability constant for mono-thioperrhenate, K<sub>01<sub> = 10<super>4<super>, while the stability constant for tetra-thioperrhenate, K<sub>04<sub> = 10<super>19<super>. Below pH 8, the formation of a rhenium-sulfur …
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The synergistic interaction between dithiophosphate and frothers at the air-water and mineral-water interface
… chalcopyrite and chalcocite was measured by UV-Vis spectrophotometry and isothermal titration calorimetry. Adsorption tests in the presence of aeration were used to determine if DTP dynamically transferred from the air-water to the mineral-water interface. At the air-water interface a regular …
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Research and development of CdTe based thin film PV solar cells
… out using photoelectrochemical (PEC) studies, UV-Vis spectrophotometry, X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Furthermore, the electrical …
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Development of copper based anti-inflammatory drugs: histodine derivatives
… of the complexes were predicted with ultraviolet-visible (UV-Vis) spectrophotometry. The visible spectra obtained for the different Cu(II)/Glycyl-Lhistidine species in solution were typical of Cu(II) complexes in a tetragonally distorted, octahedral environment. The molar extinction coefficients …
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Saponin Removal from Quinoa by Abrasion Processing
… Preliminary studies using mass balance and visual observation found the tubular system removed 4.45% of the quinoa mass in saponin containing fractions compared to the conical system (1.33%) and fluidized bed (0.62%).</p> <p>After preliminary studies, a saponin estimation method was adapted …
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Vliv parametrů dispergace na formování vezikulárních systémů
… svetla bol určený zeta potenciál a metódou UV-VIS spektrofotometrie bol na základe merania turbidity sledovaný zákal jednotlivých vzoriek. Výsledky práce prezentujú najvhodnejšie parametre ultrazvukovej dispergácie pri použití homogenizátora Bandelin SONOPULS UW 3200. Použitie týchto …