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 24 for “"polytetrafluoroethylene (PTFE)"”.
-
The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication
… 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. …
-
Construction of an Initiated Chemical Vapor Deposition (iCVD) Reactor and Deposition of Polytetrafluoroethylene (Ptfe) Thin Films Using Perfluoro-1-Octanesulfonyl Fluoride as the Initiator
… 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 …
-
Plasma-assisted deposition of chromium, fluorocarbon and chromium/carbon/fluorine films on glass, polymer and metal substrates
… (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$\sb6$ …
-
The use of thin polymeric coatings to prevent fretting corrosion and metallic contact in steel-on-steel systems
… 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). …
-
Evaluation of the Effect of Microporous Sublayer Design and Fabrication on Performance and Adhesion in PEM Fuel Cell Assemblies
… (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 …
-
Assessing differential scanning calorimetry as a retrospective dosimetry method for the verification of uranium enrichment activities
… 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 …
-
Simulating and calibrating stretchable optical fibers for studying neural dynamics
… a porous outer layer of the fiber or an embedded polytetrafluoroethylene (PTFE) fluidic channel along the side of the PVA hydrogel. Absorption swelling and kinetics of the nonporous and porous fibers are characterized experimentally and backed by theoretical analysis. PVA-PTFE composite fiber …
-
Automated Quality Assurance for Magnetic Resonance Imaging with Extensions to Diffusion Tensor Imaging
… relative to axon size, using water-filled polytetrafluoroethylene (PTFE) microbore capillary tubes. Automated procedures were developed to test fractional anisotropy (FA) map contrast and capillary bundle (axon) orientation accuracy.
-
Ultraviolet C Inactivation of <em>Salmonella enterica</em> in Raw Chicken Juice on Food Contact Surfaces with the Contamination Sanitization Inspection and Disinfection (CSI-D+) Device
… steel 304, polycarbonate, polyethylene, and polytetrafluoroethylene (PTFE). The inoculated food contact surfaces were exposed to low (5 mW/cm²) and high intensity (10 mW/cm²) UV-C at a wavelength (λ) of 275 nm using the CSI-D+ device for 15 and 30 s. The results showed that higher UV-C …
-
The design of a microfabricated air electrode for liquid electrolyte fuel cells
… bonded into a microporous matrix either by polytetrafluoroethylene (PTFE) fibrils or by polyethersulfone (PES), which is a soluble polymer in common solvents. Experiments and modeling have indicated that these materials will allow the microfabricated catalyst layer to have an effective ionic …
-
Friction and Wear of Polytetrafluoroethylene/Graphene Oxide Composite Thin Films
<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 …
-
Toward Rapid Silica Analysis of CPDM Samples using Portable Fourier Transform Infrared Spectrometry
… attached to a polypropylene (PP) backing and a polytetrafluoroethylene (PTFE) binder, which interferes with standard analytical techniques. This study developed a method for indirect analysis of dust collected on the CPDM filter stub using portable direct-on-filter Fourier Transform infrared …
-
A Novel Squid Glaucoma microShunt for Controlled Release of Aqueous Humor
… selected for future laboratory testing include polytetrafluoroethylene (PTFE), polystyrene (PS), and polydimethylsiloxane (PDMS). Five responses from glaucoma specialists were received, and they provided an average 4.4/5 rating for the likelihood of using the SGS in their practice. 3D printed …
-
Tribology of engineering and coated materials in the presence of environmentally friendly refrigerant
… thermosetting polyester (ATSP), blended with 5% polytetrafluoroethylene (PTFE), namely ATSP/PTFE, has been evaluated under unlubricated and boundary lubricated conditions. Current state-of-art polymeric coatings have also been considered for comparative purposes. Tribological and morphological …
-
Use of oxygen sensors for the non destructive measurement of oxygen in packaged food and beverage products and its impact on product quality and shelf life
… density polyethylene (HDPE), polypropylene (PP) polytetrafluoroethylene (PTFE) polymer supports. Sensors were calibrated over a temperature range of -10°C to +40°C and deemed suitable for food and beverage packaging applications. This sensor technology was used and demonstrated itself effective …
-
Design and development of electrochemical gas sensors
… in 100% RH at 20°C. (e) Extensive use of porous polytetrafluoroethylene (PTFE) membrane sealing techniques, which have dramatically improved cell integrity to the extent that leakage is virtually eliminated.(f) Matched sensing and reference electrodes in conjunction with zero bias cell operation, …
-
Tribology of polymeric coatings for aggressive bearing applications
… Due to favorable tribological performance, polytetrafluoroethylene (PTFE)- and polyetheretherketone (PEEK)-based polymeric coatings have received interest in ACR compressor applications, as a potential solution to supplement and potentially replace conventional oil lubricants. However, …
-
Micromechanisms of polymer sliding wear
… transfer characteristics. The wear behaviour of polytetrafluoroethylene (PTFE) has been included for comparative studies. The worn material was studied using stylus profilometry, optical microscopy, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), Transmission …
-
The Light Response of the XENON100 Time Projection Chamber and the Measurements of the Optical Parameters with the Xenon Scintillation Light
… the detector and the reflectivity of the teflon (Polytetrafluoroethylene, PTFE) material that surrounds the liquid xenon target volume and defines the TPC. Since the few existing measurements of reflectivity of PTFE in liquid xenon were performed in different conditions and thus could not be …
Page 1 of 2