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.
Results
Showing 1 to 20 of 85 for “"Surface characterization"”.
-
Surface characterization of LDEF materials
… exposed to the low-Earth orbit environment. Surface characterization of LDEF materials included polymers, composites, thermal control paints, and aluminum. X-ray photoelectron spectroscopy (XPS}, Auger electron spectroscopy (AES), scanning electron microscopy (SEM), and contact angle analysis …
-
Surface characterization and adhesion of plasma-modified polyimides
… bonding. Chemical changes which occurred in the surface as a result of the plasma treatments were investigated using x-ray photoelectron spectroscopy (XPS) and infrared reflection-absorption spectroscopy (IR-RAS). Water contact angle analysis was utilized to characterize the changes in surface …
-
Synthesis and Surface Characterization of Silica-Polypeptide Composite Particles
The synthesis and sequential surface characterization of silica-polypeptide composite particles is described. Nearly monodisperse colloidal silica cores were obtained by the alkaline hydrolysis of tetraethyl orthosilicate (TEOS). The hydrodynamic radius can be easily controlled in the range of ƒî …
-
Synthesis and surface characterization of semiconductor nanocrystals for photovoltaic application
Im ersten Teil dieser Arbeit wurde die Kinetik einer neuen kolloidchemischen Synthese von monodispersen sphärischen CdSe- und CdS-Nanopartikeln (QDs) untersucht, deren Wachstum in Gegenwart von in situ gebildetem Cd erfolgt. Reaktionen mit verschiedenen Se- und S-Ausgangsverbindungen, Cd- zu Se- …
-
A skin surface characterization system based on capacitive image analysis
… the feasibility of a noninvasive skin characterization system based on the analysis of capacitive images of the skin surface. The system relies on a CMOS portable capacitive device which gives 50 micron/pixel resolution capacitance map of the skin micro-relief. In order to extract …
-
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 …
-
An experimental device for critical surface characterization of YBCO tape superconductors
The twisting stacked tape cabling (TSTC) method for YBCO superconductors is very attractive for high current density, high magnetic field applications, such as nuclear fusion reactors and high energy physics experiments. Industrial scale assembling methods have been proposed, and cable samples have …
-
Surface Characterization of Poly (epsilon-caprolactone) at the Air/Water Interface
Surface behavior of poly (epsilon-caprolactone) (PCL) have been studied at the air/water interface (A/W). PCL is a hydrophobic and crystalline polyester with a glass transition temperature around -60 degrees centigrade, a melting point around 55 degrees centigrade, excellent biocompatibility, and …
-
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 …
-
A prediction of polymer wear using polymer mechanical properties and surface characterization parameters
Polymers were slid on rough hard steel surfaces with normal loads which caused full penetration (real and apparent areas equal) and partial penetration (real less than apparent area). Wear data for polyvinylchloride (PVC) and polychlorotrifluoroethylene (PCTFE) was obtained on a pin-on-disk machine …
-
Investigation Into Use of Piezoelectric Sensors in a Wheeled Robot Tire For Surface Characterization
A differential steered, 13.6 kg robot was developed as an intelligent tire testing system and was used to investigate the potential of using piezoelectric film sensors in small tube-type pneumatic tires to characterize tire-ground interaction.<br />One focus of recent research in the tire industry …
-
Surface Characterization of Siloxane, Silsesquioxane, and Maleic Anhydride Containing Polymers at Air/Liquid Interfaces
… (LB) to prepare ultra thin films on solid surfaces from monolayers at A/W has considerable utility for studying surface interactions. In particular, the phase behavior of polyhedral oligomeric silsesquioxanes (POSS) was examined using a combination of LB and Brewster angle microscopy …
-
Surface characterization of self-assembled monolayers for applications of selective ionic transport through nanoporous membranes
… small characteristics length scales. Bare solid surfaces of metal and metal oxides tend to adsorb organic contaminants in order to lower the free energy between the metal and the environment. The adsorbed matter can alter the interfacial properties of microfluidic and nanofluidic systems. The …
-
Development And Interface/Surface Characterization Of Titanium Dioxide And Zinc Oxide Electron-Collection Interlayer Materials For Organic Solar Cells
… pinhole density. We showed that sg-ZnO with high surface area porous structure allows the probe molecules and poly-thiophene (P3HT) thin layer to direct contact ITO substrate, whereas sp-ZnO with dense structural property efficiently eliminates the probe molecule diffusion and the penetration of …
-
Interfacial Electrochemistry and Surface Characterization: Hydrogen Terminated Silicon, Electrolessly Deposited Palladium & Platinum on Pyrolyzed Photoresist Films and Electrodeposited Copper on Iridium
Hydrogen terminated silicon surfaces play an important role in the integrated circuit (IC) industry. Ultra-pure water is extensively used for the cleaning and surface preparation of silicon surfaces. This work studies the effects of ultra-pure water on hydrogen passivated silicon surfaces in a …
-
Control of AFMs in contact mode
… Force Microscope (AFM) is a high precision surface characterization tool commonly used in Nano-technology, Bio-technology, semiconductors, MEMS, and life sciences' applications. As most versatile systems, AFM offers little guarantees on achieving repeatable satisfactory operation. This is …
-
A plasma polymerization investigation and low temperature cascade arc plasma for polymeric surface modification
… and butane, Section III. In Sections V and VII, surface modification treatments were performed on seven polymers using low temperature cascade arc torch (LTCAT) of Ar with or without adding reactive gas of O₂ or H₂O. Static and dynamic surface characterization techniques were used to examine …
Page 1 of 5