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 14 of 14 for “"Sunscreens"”.
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Zinc Sunscreens Affect Development of Strongylocentrotus purpuratus Embryos
<p>The growing popularity of physical sunscreens will also lead to an increased release of the ingredients from zinc oxide (ZnO) sunscreens into marine environments. Though zinc (Zn) is a necessary micronutrient in the ocean, greater than natural Zn concentrations are being released into marine …
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Synthesis of corn-derived carbohydrate derivatives as effective multifunctional sunscreen
… found they have great promise as multifunctional sunscreens, based on the isosorbide molecule as a carrier and the cinnamate group's UV absorption. In this study, a series of isosorbide derived UVB and UVA sunscreens of high extinction coefficient have been successfully synthesized. The …
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Preparação de nanopartículas de poli (metacrilato de metila) carregadas com filtros solares por processo mediado por membrana de vidro (SPG)
… the damage of skin with the use of topical sunscreens, which are intended to block the penetration of radiation into the skin layers. Encapsulation of sunscreens into polymeric nanoparticles has constituted the subject of many scientific researches due to the lower dermal absorption of …
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Design and Synthesis of New Systems for Photoprotection and Solar Energy Storage
… rational design and obtention of new synthetic sunscreens and molecular energy storage systems. In particular, an evaluation of their photophysical and photochemical properties and diverse structural modifications to tune them was done. The thesis is divided in different chapters. Firstly, an …
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Photochemical, photophysical, and photobiological studies of zeolite guest-host complexes
… variety of zeolite complexes, from catalysts to sunscreens. The first chapter describes the preparation and photophysical and photochemical characterization of two new photocatalytic materials. The catalysts are based on a multi-component zeolite, host-guest complex and the interaction between …
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Excited-state organic chemistry: Tuning photoprotective and photoredox properties
… and the development of a novel family of sunscreens designed to mitigate damage from high-energy visible radiation (HEVR). Chapter 4 also consists of three sections: an introduction to the general principles of photoredox catalysis, a systematic study of halogen atom transfer (XAT) …
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Estudio del comportamiento fotoquímico y electroquímico de yodoalquenos
… derived from cyclohexenone to act as sunscreens is examined as well. The conclusions of the dissertation are summarized in chapter 7. In chapter 8, material and methods employed in mechanistic and experimental studies are detailed.
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Evaluating the Dual Role of Municipal Wastewater Treatment Plants in the Removal Efficiency and Environmental Emission of Microplastics
… metal(loid)s, synthetic musk fragrances, sunscreens, pharmaceuticals, organophosphate flame retardants, and pesticides. Different polymer types, such as polyethylene, polypropylene, and polystyrene, were evaluated for their pollutant retention capacities, with polystyrene demonstrating …
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Characterizing Engineered Nanomaterials: From Environmental, Health and Safety Research to the Development of Shaped Nanosphere Lithography for Metamaterials
… most important finding was that the commercial sunscreens that listed titania or zinc oxide as ingredients contained nanoscale materials. Cell free photochemical tests revealed that ZnO particles without any surface coating were more active at generating ROS than surface coated TiO2 …
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Stress, fracture, and microstructure development of drying aqueous particulate coatings
Particulate coatings are ubiquitous, acting as sunscreens, architectural paints, and anticorrosive coatings. The performance of these coatings most often requires that the coating is defect free, and is dependent on the coating microstructure that forms during solidification. Regulations and …
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Carbon Nanotube Behavior in Represntative Old Leachate
… ink jet printer paper, textiles, cosmetics, sunscreens, and sporting goods. Although no direct measurement or inventory of nanomaterial disposal has been documented in the literature, life cycle based studies predict that over 50% of nanomaterials produced will likely eventually reside in MSW …
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The Chlorination of Pharmaceuticals and Other Phenolic Compounds in the Presence of Iodide
… commonly added to household products such as sunscreens, soaps, toothpastes, and deodorants. If present in natural waters, PPCPs can come into contact with disinfectants during drinking water treatment processes. PPCPs are already known to form a variety of disinfection byproducts (DBPs) when …
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Photoallergic contact dermatitis in Europe
Photoallergic contact dermatitis (PACD) is a clinical problem that has often been poorly understood and neglected by dermatologists over recent years. This can be partly attributed to its investigation by photopatch testing (PPT) falling between the expertise of photobiologists and contact …
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Knowledge, attitudes and practices of Black African males towards the use of sun protection : a case study of a University of Technology in KwaZulu-Natal
Dissertation submitted in fulfillment of the requirements for the Master of Health Sciences in Somatology at the Durban University of Technology, Durban, South Africa, 2021.