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 183 for “"hydrophilicity"”.
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Chemical Surface Modification of Polycarbonate to Increase Hydrophilicity
… reaction time, and concentration to optimize hydrophilicity. Using 1 wt% PEI at 100 ℃ for 30 minutes and 1 wt% PAA-MAA at 100 ℃ for 90 minutes, contact angles were reduced to 3° and preserved transparency. Using the two-step method with PEI and PAA-MAA, the surface of polycarbonate became …
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Improvements in the Performance and Understanding of Switchable-Hydrophilicity Solvents
Switchable-hydrophilicity solvents (SHSs) are amine and amidine solvents that can be reversibly switched between two forms: one that forms a biphasic mixture with water and another that forms a monophasic mixture with water. The addition or removal of CO2 from SHS-based systems acts as the trigger …
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Improving hydrophilicity of silicone elastomer by IPN formation with hyaluronan
… These elastomeric materials had improved hydrophilicity compared to untreated PDMS. Additionally, new chemical species (ATR/FTIR and XPS spectroscopy) and surface morphologies (SEM imaging) indicated the introduction of HA into the PDMS. Furthermore, analysis of the oxygen gas permeability …
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Wettability and hydrophilicity of rigid and soft contact lens surfaces
… lens surface and a liquid. The wettability and hydrophilicity of both soft and rigid contact lens surfaces were determined using two novel techniques and an established method. The two novel techniques were the un-separated adherent quid/laser method and the adherent liquid/ maximum force method …
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Oxidation of Microplastics: Evidenced by Spectroscopy, Hydrophilicity, and Heavy Metal Uptake
… the results of which show an increase in hydrophilicity and a growing carbonyl peak around 1770 cm<sup>-1</sup> respectively. In the chemical oxidation method, temperature and contact time are major factors in the successful weathering of microplastics, while pH did not appear to have any …
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Predicting the Risk of Crystallization for Suspensions of Amorphous Spray Dried Dispersions from Structural, Thermal and Hydrophilicity Properties
Suspensions of spray dried amorphous dispersions are a valuable tool for enhancing the exposure of poorly soluble compounds in preclinical animal models. However, limitations in drug supply and time/cost of manufacture in the drug discovery space make it desirable to predict the likelihood of …
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Polysulfone mixed matrix membranes with biosynthesis nanoparticles: enhancement of interface compatibility and antibacterial membrane seperation process
… addition of bio-AgNPs was able to enhance the hydrophilicity of composite PSf membranes which proved by decreasing the value of contact angle. Meanwhile, structure on bottom layer shown a porous bulk with finger-like structure and macroviod structure which is responsible for mechanical support. …
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Photoinduced wetting kinetics of water on immersed nanoporous titania surfaces with application to oil-water separation
… decompose the organic pollutants and restore hydrophilicity. The kinetics of this conversion from hydrophobicity to hydrophilicity were studied in situ under various UV intensities using goniometric measurements and a simple adsorption-photocatalysis model is proposed to describe the observed …
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DYNAMIC SURFACES FOR URINARY CATHETERS: THE EFFECT OF POLY (GLYCEROL SEBACATE CITRATE) COMPOSITION ON DEGRADATION, ENCRUSTATION RESISTANCE AND BACTERIAL RESPONSE
… characteristics, mechanical behaviour, hydrophilicity and encrustation resistance of bulk samples were investigated and the feasibility of coating a silicone catheter material with PGSC using oxygen plasma treatment was assessed. The effect of citric acid concentration on encrustation …
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Temperature-dependent Terahertz Time-domain Spectroscopy as a Tool to Assess the Crystallisation Tendencies of Amorphous Drug-Polymer Systems
… groups. Additionally, the influence of polymer hydrophilicity was shown to modulate water uptake and relaxation behaviour. In the strongly interacting systems of indomethacin and felodipine, the evaporation of tightly bound water caused sharp changes in mobility, particularly in the most …
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Synthesis and Characterization of Poly(arylene ether sulfone)s for Reverse Osmosis Water Purification and Gas Separation Membranes
… functionality, polymer composition, and polymer hydrophilicity. Sulfonated bisphenol A based poly(arylene ether sulfone) random copolymers were synthesized with reactive amine endgroups and further functionalized with a tetra-epoxy resin, acryloyl chloride, phenylethynyl phthalic anhydride, and …
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Ab initio molecular dynamics simulations of lanthanide coordination structures in water and in faujasite
… systems to study the influence of confinement, hydrophilicity, and cation exchanged on the local structure of water as quantified from radial distribution functions. Increases in hydrophilicity in hydrogen-exchanged faujasite disrupts the confined water structure. While lanthanum ions compensate …
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Effects of water-soluble polymers upon some properties of natural rubber latex
… 2, were principally characterised by viscometry, hydrophilicity assessment and infra-red analyses. It has been found that such characteristics of these polymers as molecular weight, composition distribution and hydrophilicity are dependent upon the method used for their preparation. Explanations …
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Tailoring Metal–Organic Frameworks for Water Harvesting
… the framework pore can greatly increase the hydrophilicity of a framework. Within Chapter 5, the author investigates the relationship between pore hydrophilicity and kinetic hysteresis, finding that kinetic limitations arise in sufficiently hydrophilic frameworks. Chapter 6 explores the …
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Study on the effect of zeolite rice husk particles on polysulfone membrane
… the highest water permeability (315.29 Lm-2h-1), hydrophilicity (45o) porosity (41.5%) and good rejection (97.8%) ability. Membranes with higher RHY content (more than 2wt. %) generated more particle agglomeration that disturbs membrane structure as can be observed in the cross-section and …
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The effect of flower-like tatania towards characteristics and performance of polysulfone mixed matrix membrane
… area, particle distribution, surface roughness, hydrophilicity property, mean pore size, mechanical strength and porosity. Meanwhile, membrane performances were evaluated in terms of HA rejection, PWF, antifouling, antibacterial activity and photocatalytic properties based on self-cleaning …
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Interactions of single-crystal lithium niobate surfaces with ultra-violet laser radiation
… split naturally into three areas: effects on hydrophilicity by low intensity laser irradiation, effects on ferroelectric domain inversion by focussed laser irradiation, and modelling of the heating and subsequent lithium diffusion during focussed laser irradiation.<br/><br/>It was seen that …
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Metal oxide modified tubular ceramic membrane for the separation of oil-in-water emulsion.
… nanoparticles for surface wettability to improve hydrophilicity and increase O/W emulsion separation efficiency. A novelty material – Magnesium Oxide (MgO) - nanoparticles modified tubular ceramic membrane was investigated and discovered to have a high hydrophilicity and O/W emulsion separation …
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Modification of thin film composite (TFC) membrane by incorporation with copper nanoparticles (Cu-NPs) for antibacterial properties
… existed on both types of membranes. Surface hydrophilicity of the membranes was enhanced by the presence of Cu-NPs, as indicated by the measured contact angle of 63.25� 0.75 for TFC, 38.63 � 2.16 for TFC-CuNPs, and 58.00 � 3.39 for TFC-S-CuNPs. Consistently, the water flux obtained from the …
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