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 67 for “"Plasma treatment"”.
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Surface wettability studies of PDMS using flame plasma treatment
The flame plasma treatment studied in this thesis was able to oxidize the surface of Polydimethylsiloxane (PDMS) in a fraction of a second. It was found to be a much faster way to modify PDMS surface wettability than the current technologies. The surface wettability of Polydimethylsiloxane (PDMS) …
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Wool fabric plasma treatment: resulting properties evaluation and applications in field
Industry is on a continuous way to search new treatments and novel technologies to reduce costs, increase productivity, decrease waste generation and treatment. The textile industry is characterized by mature processes and its breakthrough has necessarily to come from technological transfer from …
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High performance thermoplastic matrix composite processing: dry powder prepregging, plasma treatment, consolidation/crystallization analysis
The quest for developing high performance materials, originally responsible for the birth and growth of the composites industry, is now responsible for the drive to produce composites which outperform those used today. A great deal of this interest lies in the use of thermoplastic polymers as the …
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Plasma Treatment of Zinc Oxide Thin Film and Temperature Sensing Using the Zinc Oxide Thin Film
… were treated with oxygen, hydrogen, and nitrogen plasmas. Oxygen plasma treatment improved the crystallinity of zinc oxide thin film. Hydrogen plasma treatments were found very effective in improving the electrical conductivity of the film sacrificing film’s transmittance. Nitrogen plasma …
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Fibre Modification for Concrete Reinforcement using a Novel Atmospheric Microwave Induced Plasma Torch (MIPT)
… the design of a novel microwave induced plasma torch for the surface modification of non-corrosive fibres. The system was developed to reduce the equipment cost, and production time needed in the conventional plasma treatment. To generate a consistent and low-cost microwave plasma jet at …
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An Investigation of Pore Collapse in Asymmetric Polysulfone Membranes
… research investigates the influence of amine plasma treatments on the surface pore structure of polysulfone membranes. The permeation of a rhodamine dye through the plasma treated membranes and through non-plasma treated membranes is used to examine the influence of the plasma treatment. …
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Development of low coast atmospheric pressure plasma jet for nano and bio technology applications
The development of cold atmospheric plasma (CAP) can overcome many limitations of low pressure plasma. Low temperature plasma is widely used in the semiconductor and medical industry for cleaning purposes. However, the process is time consuming because low pressure plasma requires vacuum …
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Adhesion and Durability of Coatings on Polypropylene Exterior Sidings
… thus increasing wettability and adhesion, is plasma treatment. The primary focus of this project was to study how plasma treatment improved adhesion of a water-reducible coating. This coating represented a product used in commercial siding. The surface tension of the panels was increased from …
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Surface Functionalised Emulsion- Templated Porous Polymers for In- Vitro Cell Culture
… routes to this include chemical modification, plasma treatment and chemical adsorption. Of these three routes to surface functionalisation, the plasma processing appears to give the best results, with further attachment of biologically-directing molecules, possible. This thesis presents oxygen …
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… commercially surface treated and oxygen plasma treated PAN based carbon fibers were used for study. XPS was used to determine fiber surface chemistry. A two-liquid tensiometric method was conducted to determine fiber surface energy and its dispersion and polar components. SEM was used to …
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Surface:plasma interactions in GaAs subjected to capacitively coupled RF plasmas
Surface compositional changes in GaAs due to RF plasmas of different gases have been investigated by XPS and etch rates were measured using AFM. Angular Resolved XPS (ARXPS) was also employed for depth analysis of the composition of the surface layers. An important role in this study was …
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Surface characterization and adhesive bonding of carbon fiber-reinforced composites
The effect of surface pretreatment on the adhesive bonding and bond durability of carbon fiber/epoxy and carbon fiber/bismaleimide matrix composites was studied. Methyl ethyl ketone (MEK) wipe, peel ply, grit blast and gas plasma treatments were the pretreatments of interest. Chemical and physical …
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Characterization and control of biofilm and biofluid microstructure and rheology
… of biofilms is important to design treatments for their removal. The main problem is that biofilms are very complex and often heterogeneous, making them difficult to characterise and model. In addition, the restructuring of biofilms can be a result of changes in their growth …
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Development of novel catalysts coated non-fluorinated proton exchange membranes for water electrolysis
… chemi-cal stability of the prepared membranes. Plasma treatment was employed to modify the nanofillers. The modification of CNTs through oxygen treatment followed by MoS2 sputtering proved to be more effective than other methods, as the process was controllable, rapid, and posed minimal risk of …
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Durability and Adhesion of a Model Epoxy Adhesive Bonded to Modified Silicon Substrates
… The effectiveness of combining the oxygen plasma treatment and silane coupling agent (SCA) derivatization in adhesion promotion for an epoxy bonded to a silicon surface was evaluated in this research. SCAs with different amine functionalities were studied. The oxygen plasma treatment time …
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Identification of changes in the surface of textiles subjected to plasma chemical treatment using attenuated total reflectance-fourier transform infrared spectroscopy
<p>Plasma chemical oxidation has been proposed as a “nondestructive” method for preparing samples from archaeological materials for radiocarbon dating using accelerator mass spectrometry. However, the chemical effects of low-temperature, low-pressure plasma discharges on fragile archaeological …
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Hydration-Induced Plasma Surface Modification of Aluminum Nanoparticles for Power Generation in Oxygen Deficient Environments
… the Al fuel core. One approach uses atmospheric plasma treatment to physically reduce the Al2O3 shell thickness while simultaneously exposing the defected surface to water vapor to promote surface hydration. Combining water-vapor with an atmospheric helium dielectric barrier discharge (DBD) …
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Avaliação da resistência mecânica e da molhabilidade de fibras de aramida após tratamento com plasma de argônio
… the surface of aramid fiber treated with argon plasma. The fiber was treated with argon plasma with a vacuum of 8x10-1 bar with power of 50 and 100 Watts, and, for each voltage, tests were carried out with duration of 1, 3 and 5 minutes. The tests performed were tensile tests, tensiometry and …
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DYNAMIC SURFACES FOR URINARY CATHETERS: THE EFFECT OF POLY (GLYCEROL SEBACATE CITRATE) COMPOSITION ON DEGRADATION, ENCRUSTATION RESISTANCE AND BACTERIAL RESPONSE
… catheter material with PGSC using oxygen plasma treatment was assessed. The effect of citric acid concentration on encrustation resistance properties and against E. coli and P. mirabilis infections was then analysed. To optimise the production of the PGSC, the effect of N2 atmosphere on …
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