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 18 of 18 for “"oxygen plasma treatment"”.
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… Untreated, 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 …
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Durability and Adhesion of a Model Epoxy Adhesive Bonded to Modified Silicon Substrates
… spectroscopy. 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 …
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Development Of Single And Array Electro-Chemical Sensors For Real-Time Trace Metal Analysis In Aqueous Environmental Media
… of other species’ adsorption at surface oxygen groups. This stepwise functionalization approach served as a universal platform for elevating CFMs’ selectivity, while retaining sensitivity, response, stability, and lifetime.</p> <p>In parallel work, pyrolyzed photoresist film (PPF) …
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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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STUDY OF GAS ADSORPTION ON AS-PRODUCED AND MODIFIED CARBON NANOTUBES
… that were structurally modified using acid treatment. Enhancement of the sorptive capacity and the presence of two distinct kinetics of gas adsorption verified partial opening of single walled carbon nanotubes as a result of chemical treatment. Mutiwalled carbon nanotubes were exposed to …
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Plasma Treatment of Zinc Oxide Thin Film and Temperature Sensing Using the Zinc Oxide Thin Film
… zinc oxide thin films, films 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 …
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Process-Induced Degradation during the Integration of Pb(Zr/x Ti/1-x)O3 Ferroelectric Capacitors
… capacitor module requires high density plasma to pattern their shapes because of a low volatility of etched byproducts, therefore the degradation of ferroelectric capacitor performance could occur by the collision of high energetic particles. The damage of PZT thin film due to dry …
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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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Development Of Carbon Based Neural Interface For Neural Stimulation/recording And Neurotransmitter Detection
… fabrication of microelectrode arrays. By the oxygen plasma treatment of photoresist prior to pyrolysis, we obtained carbon fiber arrays. Good sensitivity in dopamine detection by this carbon fiber arrays and improved adhesion have been demonstrated.</p>
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Solution-Processed ZnO Nanoparticles for Optically Addressed Spatial Light Modulators and Other Applications
… effect such as thermal annealing and oxygen plasma treatment was also investigated. Then ZnO NP-based OASLM was researched by simulation and device characterization regarding electrical and optical properties. More importantly, the optimization of ZnO NP-based OASLMs was conducted in …
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Growth and Characterization of (InxGa1-x)2O3, and NiO Heterostructures
… sapphire substrate at temperatures of 700ºC and oxygen partial pressure of 10-2 Torr was found for indium composition ≤10%. Theoretical calculations revealed that the addition of In in Ga2O3 increases the lattice constant and reduces the bandgap of the alloy. This was confirmed by measurements of …
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Developing next generation, non-toxic, inorganic materials for photovoltaics and thin-film transistors
… function of MoS<sub>2</sub> is tuned through oxygen plasma treatment to increase its work function. The experimental examination of defect tolerance of BiOI is conducted in chapter three. BiOI films are vacuum-annealed to induce surface composition changes. Large changes in surface atomic …
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Interface Engineering and Substrate Design for Anode-free Lithium Metal Batteries
… lithium deposition in anode-less systems. Oxygen plasma treatment was employed to introduce functionalized defect sites on graphene. These controlled defects enhance the lithiophilicity of the graphene/Cu current collector, promoting uniform lithium deposition. In addition, defective …
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An Investigation of Plasma Pretreatments and Plasma Polymerized Thin Films for Titanium/Polyimide Adhesion
Plasma pretreatments are environmentally benign and energy efficient processes for modifying the surface chemistry of materials. In an effort to improve the strength of the titanium alloy/FM-5 polyimide adhesive joint for aerospace applications, oxygen plasma pretreatments and novel thin plasma …
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Development of coagulation monitoring devices
… substrate with various surface layers such as oxygen plasma treatment, poly (acrylic acid), polyelectrolyte, SiOx and dextran to produce surfaces which were hydrophilic and biocompatible with blood. A broad range of modified surfaces were investigated and documented. A detailed physical and …
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Characterization of the molecular structure at modified polymer surfaces and polyphenylene sulfide/copper interphases
… optimize experimental conditions. Results after plasma treatment indicated a very thin modified surface layer (< 10 nm) where the thickness and specific surface chemistry depended on the polymer and plasma gas used. The interaction of an epoxy resin with a surface modified PPS film showed that …
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Microenvironmental Modulation of Breast Cancer Stem Cells Through Biological Matrix
… method. Wavy microfeatures were fabricated by oxygen plasma treatment on polydimethylsiloxane (PDMS) films. 2D thin films with extracellular matrix proteins using dip coating and layer by layer method was also prepared. All matrices were visualized using SEM or AFM techniques and optimized for …
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DYNAMIC SURFACES FOR URINARY CATHETERS: THE EFFECT OF POLY (GLYCEROL SEBACATE CITRATE) COMPOSITION ON DEGRADATION, ENCRUSTATION RESISTANCE AND BACTERIAL RESPONSE
… a silicone 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 …