Global ETD Search
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 20 of 59 for “"photo-oxidation"”.
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Time controlled photo-oxidation of polyolefins by polymer bound additives
… vinyl or thiol functional groups (used as photoactivators) have been synthesised and some of these were successfully bound to both polyethylene and polypropylene backbones during processing in the presence of peroxide and interlinking agent. Concentrates (masterbatches) of the …
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The effect of iron on the photo-oxidation of humic substances
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Metal Complex Photo-activators for the Time-Controlled, Photo-Oxidation of Polyolefins
The use of antioxidant photo-activator (APA), which is based on a combination of a photo-activator (ideal, e.g., iron dialkyldithiocarbamate (FDMC) and conventional, e.g., iron acetylacetonate (FAcAc)) and U.V. stabilizer, has been examined in both low-density polyethylene (LDPE) and polypropylene …
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Biologically inspired materials for electro-responsive coatings and the photo-oxidation of water
… the way nature employs peptides, a synthetic photocatalytic system for water oxidation was developed using photosystem II (PSII) as a model. Proteins form the structural scaffold for PSII, assembling dye molecules as well as the metal-oxo catalytic center; furthermore, peptides play an active …
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The Antioxidant Function of Lutein in Controlling Photo-Oxidation of a Colloidal Beverage System
… addition of lutein to provide protection against photo-oxidation of susceptible compounds also was investigated. Fluorescent light-exposure (14 d, 4°C) of the control beverage system led to a decline in sensory quality based on triangle test results. Sensory quality also declined in the …
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The photo-oxidation of benzyl alcohol over TiO2 and Pt TiO2 and the effect of reaction conditions
… benzaldehyde is commonly produced by the oxidation of benzyl alcohol (B-Alc) using stoichiometric amounts of hazardous oxidants such as chromates. The selective, photocatalytic oxidation of benzyl alcohol offers a promising, more environmentally friendly method of producing benzaldehyde. …
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A Study of the Factors Affecting the Deteioration of Old Paint Media
… for evaluating the changes occurring during photo-oxidation and two have been found to be particularly useful. The first involves a measurement of the decrease in IR_absorbance of the -CH2- stretching vibration at 2930 cm-1 which correlates with weightloss. The second monitors the formation …
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Triplet exciton dynamics in conjugated polymer films
… are also believed to play a primary role in photo-oxidative degredation of polymer devices. Two-photon photoemission is used to probe triplet exciton relaxation dynamics in pristine conjugated polymer films and triplet-triple annihilation is determined to be an important deexcitation …
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Synthesis of photochemically active complexes for DNA recognition and binding
… of this thesis is to synthesize and examine the photophysical and structural properties of 3-(pyridin-2-yl)imidazo[1,5-a]pyridine (P) and 3-(pyridin-2-yl)imidazo [1,5-a]pyridine (IQ) based cations and their potential use as DNA binding agents. The P ligand was aimed to compare with the IQ ligand …
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Investigating the mechanisms of desiccation tolerance in the resurrection plant, myrothamnus flabellifolius (WELW)
… under water limiting conditions can result in photo-oxidation which causes damage to plant tissues. M flabellifolius is a homoichlorophyllous plant and thus retains chlorophyll during desiccation. The mechanisms whereby this plant prevents photo-oxidation damage are not known and thus one of …
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An Evaluation of Tellurium Compounds as Polymer Stabilisers
… stabilisers during processing and thermal oxidation but they do not lead to good UV stability during photo-oxidation. When used in combination with 4-octyloxy-2-hydroxvbenzophenone (HOBP) or when analogues of HOBP were incorporated into the organotellurium molecule the UV stability was …
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Project Synthesis of N Acetyl L Histidine Ethyl Amide and Standard Operating Procedure for Fractional Collector
<p>Photo oxidation of proteins leads to the formation of cross links of the amino acids in the proteins and leads to induction of cataracts, photo aging of the skin and in the Photodynamic therapy of tumors.<strong></strong></p> <p>Oxidation of proteins involves significant modification of …
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Synthesis and Physical Investigation of Tellurium Dithiocarbamates
… to study their ligand exchange reactions. The photo-reaction of solutions of these compounds with dioxygen was investigated. The tetrakis(dialkyldithiocarbamato) tellurium(IV) [Te(dtc)4] was found to be a good stabilizer for polypropylene (PP) during photo-oxidation. In addition, [Te(dtc)4] …
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The Accelerated Photo-Degradation of Low Density Polyethylene
… in the range 280 - 340 nm as possible photo-activators to low density polyethylene (LDPE). They included benzophenone, substituted benzophenones, metal-di-thiocarbamates, transitional metal-complexes containing ligands, acetyl-acetone substituted salicylaldoximes, …
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Degradation of Cd-yellow pigment: an ab initio study of defects and adsorption of oxygen and water on CdS
… alone does not constitute conclusive proof of photo-oxidation. The origins of such chemical and physical alterations are still under debate. Structural defects in CdS, among other possible causes like photo-oxidation processes, may play a role in the degradation process. Their presence in the …
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A study of certain trace metals in sea water using anodic stripping voltammetry
… for the destruction of dissolved organic matter (photo-oxidation with ultra-violet radiation), and with an addification procedure to obtain measurements of trace metal speciation in sea water. An argument for the existence of Cu-aspartic acid chelates in sea water has been described theoretically …
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Subcellular labelling of myelin protein (PLP and DM20) in the central nervous system
… subcellular localisation were investigated. The photo-oxidation technique was applied to both cerebellar and cervical spinal cord vibratome sections. A brominated eosin conjugated secondary antibody was created and used to label a primary antibody against PLP and DM20. The photo-oxidation …
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