NDLTD logo NDLTD Union Catalog and Global ETD Search

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 56 for “"Polytetrafluoroethylene"”.

  1. Friction and Wear of Polytetrafluoroethylene/Graphene Oxide Composite Thin Films

    Carter, Justin Kyle2017

    <p>Polytetrafluoroethylene (PTFE) is a commonly used solid lubricant due to its low coefficient of friction and chemical inertness. As a polymer, PTFE suffers from high wear and low adhesion to substrates limiting its use as a thin film. Thin PTFE films are ideal candidates for solid lubrication in …

    arkansas Repository record

  2. Hyaluronic acid enhancement of expanded polytetrafluoroethylene for small diameter vascular grafts

    Lewis, Nicole R., author, James, Susan P., advisor, Popat, Ketul C., committee member, Bailey, Travis, committee memberColorado State University. Libraries2014

    … While polyethylene (Dacron) and expanded polytetrafluoroethylene (ePTFE) are the most commonly used small diameter synthetic vascular graft materials, there are significant limitations that make these materials unfavorable for use in the low blood flow conditions of the small diameter …

    colostate Repository record

  3. The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication

    Klaas, Nkosana VDepartment of Mechanical Engineering2003

    … behaViour of 25 % wt glass fibre filled polytetrafluoroethylene (PTFE) under dry sliding conditions. The experimental work was extended to compare and include its wear behaviour with other fillers such as bronze, carbon and graphite and to conduct tests under under water lubrication. …

    cape-town Repository record

  4. Adhesion of copper to polytetrafluoroethylene surfaces modified with vacuum UV radiation downstream from He and Ar microwave plasmas

    Desai, Hrishikesh R.

    rit Repository record

  5. Surface modification of polytetrafluoroethylene (PTFE) with Vacuum UV radiation from helium microwave plasma to enhance the adhesion of sputtered copper

    Liao, Xiaolu

    rit Repository record

  6. Construction of an Initiated Chemical Vapor Deposition (iCVD) Reactor and Deposition of Polytetrafluoroethylene (Ptfe) Thin Films Using Perfluoro-1-Octanesulfonyl Fluoride as the Initiator

    Kosgey, Edgar Kiprop

    … a custom-built iCVD reactor and use it to grow polytetrafluoroethylene (PTFE) thin films. Perfluoro-1-octanesulfonyl fluoride (PFOSF) was used as the initiator while hexafluoropropylene oxide (HFPO) was used as the monomer. HPFO is well known for its good thermal decomposition. Nichrome …

    mo-state Repository record

  7. Kr-F laser surface treatment of poly(methyl methacrylate), glycol-modified poly(ethylene terephthalate), and polytetrafluoroethylene for enhanced adhesion of Escherichia Coli K-12

    Suggs, Allison ElizabethVirginia Tech2002

    … poly(ethylene terephthalate), and polytetrafluoroethylene and its effect on the adhesion of Escherichia Coli K-12 bacteria. These three polymers were chosen for their very different mechanisms of ablation as well as their range of surface free energies and bacterial responses[2-4]. …

    vt Repository record

  8. New Approaches to Automated Analytical Instrumentation

    CORNS, WARREN THOMAS1991

    … a silicone rubber membrane GLS and a microporous polytetrafluoroethylene membrane GLS.

    plymouth Repository record

  9. Plasma-assisted deposition of chromium, fluorocarbon and chromium/carbon/fluorine films on glass, polymer and metal substrates

    O'Keefe, Matthew J.University of Illinois at Urbana-Champaign2011

    … (Cr/C/F) thin films onto glass, polytetrafluoroethylene (PTFE), and low carbon, cold rolled steel substrates has been studied. Depositions were conducted in an internal electrode, radio frequency sputter deposition system at 100 W of power for one hour. Argon and C$\sb2$F$\sb6$ …

    uiuc Repository record

  10. A novel polymeric prosthetic heart valve: design, manufacture, and testing

    Brubert, JacobUniversity of Cambridge2016

    … better than polyester, but worse than expanded polytetrafluoroethylene and pericardium graft materials. In measures of inflammation, the BCPs and polytetrafluoroethylene were better than polyester and pericardium. A durable heparin coating gave SEPS22 superior haemocompatibility compared to all …

    cambridge Repository record

  11. Effect of chain structure on the thermodynamics and kinetics of polymer crystallization

    Snyder, Chad R.Virginia Tech1995

    … T<sub>m</sub>, and lamellar thicknesses of polytetrafluoroethylene have been determined in this work. T<sub>m</sub> has been shown to be 331±2°C. By atomic force microscopy and theoretical arguments it has been shown that the lamellar thicknesses of polytetrafluoroethylene, over the …

    vt Repository record

  12. Experimental investigation of surface temperatures of some polymers in unlubricated sliding

    Li, Stephen HongmanVirginia Polytechnic Institute and State University1976

    … polymers, namely high density polyethylene, polytetrafluoroethylene, polystyrene, and polymethylmethacrylate were investigated. Effects of load and sliding speed on the friction and wear behavior of the polymers were examined. Finally, the experimental results were compared with theoretical …

    vt Repository record

  13. Ridge Preservation Using Guided Regeneration, Free Gingival Grafts, and Platelet-rich Plasma // Ридж презервейшън с приложение на направлявана регенерация, пълнослойни гингивални трансплантати и богата на тромбоцити плазма

    Yotsova, Ralitsa, Йоцова, РалицаMedical University of Varna2023

    … in post-extraction sockets using non-porous polytetrafluoroethylene membranes alone and in combination with platelet-rich plasma, as well as free full-thickness gingival grafts as a method of socket sealing. Post-extraction bone resorption may necessitate additional regenerative procedures …

    varna Repository record

  14. The use of thin polymeric coatings to prevent fretting corrosion and metallic contact in steel-on-steel systems

    Day, Kent AllenVirginia Polytechnic Institute and State University1986

    … chosen for study: polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), polyimide (PI), polyvinylidene fluoride (PVDF), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), low-density polyethylene (LOPE), high-density polyethylene (HDPE), polysulfone (PSO) and polystyrene (PS). …

    vt Repository record

  15. Ion Beam Mixing of Metal/Fluoropolymer Interfaces

    Dennis, Darcie LeAnn

    … implanted thin metal layers on Teflon PTFE (polytetrafluoroethylene). RBS analysis shows that thin layers copper and chromium approximately 300-400 Å thick become distributed though the implant layer of the Teflon. When the implant fluence increases the metal is distributed over a small …

    mo-state Repository record

  16. An experimental study of the magnetic linear birefringence and dichroism of liquids, solutions and dispersions

    Batchelor, Peter JohnCity of London Polytechnic1982

    … birefringence and dichroism of crystalline polytetrafluoroethylene of about 0.2 in diameter, dispersed in water. These covered a volume fraction range of about 10" to 0.5, the latter being a highly turbid, concentrated colloidal dispersion. At volume fractions greater than about 0.1, the …

    london-metro Repository record

  17. Biocompatibility of an implantable ophthalmic drug delivery device

    Cohen, Sarah J. (Sarah Jennifer)Massachusetts Institute of Technology2007

    … and materials. Cell culture studies identified a polytetrafluoroethylene filter with 100m pores as a promising addition to seal devices from interaction with fibroblasts. Test devices with or without this membrane were implanted on the rabbit eye for 2 or 10 week periods. They were evaluated …

    mit Repository record

  18. Hemocompatibility of polymeric materials for blood-contacting applications

    Woodbury, Jodi Marie, author, Popat, Ketul, advisor, Dasi, Prasad, committee member, Reynolds, Melissa, committee memberColorado State University. Libraries2015

    … have assessed the hemocompatibility of expanded polytetrafluoroethylene (ePTFE), linear low-density polyethylene (LLDPE) and polyethylene terephthalate (PET); 3 potential materials for blood-contacting applications. The surface morphology was characterized using scanning electron microscopy …

    colostate Repository record

  19. Evaluation of the Effect of Microporous Sublayer Design and Fabrication on Performance and Adhesion in PEM Fuel Cell Assemblies

    Henderson, Kenneth ReedVirginia Tech2005

    … (MSL). The MSL is a mixture of carbon black and polytetrafluoroethylene (PTFE), which is typically applied to the gas diffusion layer (GDL). The composition (wt.% PTFE) and loading (mg/cm2) can be varied to optimize the electrochemical performance of the PEMFC and the overall adhesion of the …

    vt Repository record

  20. Assessing differential scanning calorimetry as a retrospective dosimetry method for the verification of uranium enrichment activities

    Connick, Rachel ClareMassachusetts Institute of Technology2022

    … sensitivity for the application, based on polytetrafluoroethylene (PTFE) and the thermal analysis techniques differential scanning calorimetry (DSC) and fast scanning calorimetry (FSC). The DSC-PTFE system shows statistically significant sensitivity in the dose ranges expected. The FSC-PTFE …

    mit Repository record

Page 1 of 3