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Showing 1 to 20 of 31 for “"Argon plasma"”.
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Fundamental properties of a microwave induced argon plasma
… behaviour of a microwave excited electrodeless argon discharge is investigated at pressures between 0.02 and 6.00 mbar. Spectroscopic measurements of twenty one emission lines of the argon I spectrum and seven lines of the argon II spectrum are combined with microwave impedance and Langmuir …
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Application of Argon Plasma Technology to Hydrophobic and Hydrophilic Microdroplet Generation in PDMS Microfluidic Devices
<p>Abstract Application of Argon Plasma Technology to Hydrophobic and Hydrophilic Microdroplet Generation in PDMS Microfluidic Devices Brennan Graham Microfluidics has gained popularity over the last decade due to the ability to replace many large, expensive laboratory processes with small handheld …
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The role of surface pretreatment and surface analysis in the bondability of carbon fiber-polyimide matrix composites
… wash, gritblast, sulfuric acid soak, ammonia plasma, argon plasma, argon plasma followed by ammonia plasma, nitrogen plasma, and oxygen plasma. The pretreated surfaces were chemically characterized through the use of XPS (X-ray photoelectron spectroscopy), ISS (ion scattering spectroscopy), …
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Study of contaminants in plasmas during decommissioning processes
… when contaminated components are subjected to plasma-based decommissioning processes are developed. Two parallel plasma systems are developed and investigated. A better-understood argon plasma based system has temperature measurement methods developed, along with an exploration of the resultant …
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Avaliação da resistência mecânica e da molhabilidade de fibras de aramida após tratamento com plasma de argônio
… and 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 …
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Evaluation of slurry injection for the determination of metals in solid samples using inductively coupled plasma atomic emission spectrometry
It has been said that inductively coupled plasma (ICP) is the panacea for the determination of metals in environmental samples. The ease of sample introduction for liquids coupled with excellent limits of detection of this spectrometric method provide the analyst with the ability to perform rapid, …
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Ion flux maps and helicon source efficiency in the VASIMR VX-100 experiment using a moving Langmuir probe array
… array that measured and mapped ion flux and plasma source efficiency in a flowing plasma with large (∼1.5 T) external magnetic fields in the VASIMR (Variable Specific Impulse Magnetoplasma Rocket) VX-100 experiment. The probe array was swung through an argon plasma revealing a detailed …
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Trace element analysis of bighorn sheep horns
… determined in all samples by inductively coupled argon plasma spectroscopy. Year of horn growth was determined for 154 of the samples. All elements of concentrations varied significantly with respect to location. Some elements varied similarly to other elements with respect to location, but most …
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Copper metallization with an electron cyclotron resonance
An "electron cyclotron resonance" plasma source, used for physical vapor deposition of copper into sub-micron features, was studied to determine whether parameters, such as gas atom density, electron density and temperature, surface bias, and copper ionization fraction at the deposition surface, …
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Studies on the dynamics of limited filaments
… a diagnostic, conductive limiter is presented. Plasma filaments are coherent structures present in many fusion devices and transport a significant amount of particles and energy to vacuum chamber walls. The theories of filament propagation are based on a circuit model of current closure loops …
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An experimental study and modeling of Transformer-Coupled Toroidal Plasma processing of materials
The Transformer Coupled Toroidal Plasma (TCTP) source uses a high power density plasma formed in a toroidal-shaped chamber by transformer coupling using a magnetic core. The objectives of the thesis are (1) to characterize the TCTP source, (2) to understand the kinetics and limitations of species …
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Experimental Studies of Spacecraft Plasma Interactions: Facility Characterization and Initial Measurements
… of this thesis are to characterize the plasma environment of a new vacuum chamber facility at Virginia Tech and to perform initial measurements of plasma flow field for studying spacecraft-plasma interactions using this facility. An argon plasma environment was created using a hot …
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Dekontamination der Eischale von Konsumeiern mithilfe von atmosphärischem Plasma
… Die Behandlung mit kaltem atmosphärischem Plasma ist eine neue Technologie für ein schonendes und effizientes Dekontaminationsverfahren. Es ist ionisiertes Gas aus einer Mischung von UV-Strahlung, geladenen Teilchen und freien Radikalen. Ziel dieser Arbeit war es daher, die Effektivität von …
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enhancement of charge particle emission from a plasma focus device
Design and optimization of a low energy plasma focus for enhancing charged particle emission and x-ray radiation from the plasma focus device have been investigated. The design concept and the technical details are described. Design and fabrication of the required diagnostic instruments used to …
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RF-compensated Langmuir Probe Diagnostics of Pulsed Plasma Ion Implantation System
… of ion implantation dose in processing plasmas. The vital variable is fluence, i.e. ion implantation dose, which is currently predicted by Lieberman model during high-voltage Plasma Ion Implantation (PII). Chapter \ref{chap:intro} starts with an introduction of plasma ion implantation. …
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Ignition and flameholding in supersonic flow by injection of dissociated hydrogen
… experiment using hydrogen atoms generated by a plasma torch. The supersonic combustion tests were conducted in a direct-connect mode at atmospheric pressure with either ambient temperature air or burner-heated vitiated air with total temperatures from 1200 to 4000 R. Both semi-freejet and ducted …
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Surface characterization of plasma treated carbon fibers and adhesion to polyethersulfone
A series of RF plasmas was chosen to modify the surface chemical composition of Hercules IM7 carbon fibers. A two-liquid tensiometric method was used to determine the surface energy parameters y(ds) and I(psf) of the fibers. An XPS analysis of air and argon plasma treated fibers indicated a …
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Spectroscopic characterisation of high dielectric constant materials on semiconducting surfaces
… in an oxygen atmosphere. The affects of an argon plasma ion assisted deposition technique (used in the growth of optical coatings to aid in film densification) and the oxygen back pressure on the growth of an interfacial oxide region were investigated by XPS. On gallium arsenide substrates, …
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