This study deals with preparation of substrates suitable for surface-enhanced Raman spectroscopy (SERS) applications by sputtering deposition of gold layer on the polytetrafluorethylene (PTFE) foil. Time of sputtering was investigated with respect to the surface properties. The ability of PTFE-Au substrates to enhance Raman signals was investigated by immobilization of biphenyl-4,4'-dithiol (BF...

A 71-yr-old male patient with three vessel coronary artery disease underwent a coronary artery bypass graft. The patient was found to have a large pericardial defect at the apex of the heart that measured approximately 18 cm in circumference. The edge of the pericardial defect impinged on the epicardial coronary arteries. The left phrenic nerve descended via the dorsal boundary of the pericardi...

We report the case of a 21-year-old male with high-output heart failure due to a femoral arteriovenous fistula caused by a firearm wound. A new balloon expandable stent covered with polytetrafluorethylene was implanted in the artery to occlude the arteriovenous fistula. The fistula was immediately occluded and the artery remained patent. On the following day, the patient felt much better, with ...

Copyright: © 2013 Orloff MJ. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abbreviations: LT: Liver Transplantation; BEV: Bleeding Esophageal Varices; TIPS: Transjugular Intrahepatic Portosystemic Shunt; EPC...

Solvent-free (SF) anodes with different carbon materials (graphite, hard carbon, and soft carbon) were fabricated to investigate the stability of polytetrafluorethylene (PTFE) degradation. The graphite anode large volume variation during charge/discharge process showed poor cycle life performance, while low-volume expansion good life. SF electrodes a high loading 10.7 mg/cm2 revealed long-term ...

Abstract Polymer electrolyte fuel cells require gas diffusion layers that can efficiently distribute the feeding gases from channel structure to catalyst layer on both sides of membrane. On cathode side, these must also allow transport liquid product water in a counter flow direction air channels where it be blown away by flow. In this study, two-phase fibrous structures was simulated using lat...

The primary removal of product water in proton exchange membrane (PEM) fuel cells is through the cathode gas diffusion layer (GDL) which necessitates the understanding of vapor and liquid transport of water through porous media. In this investigation, the effect of microporous layer (MPL) coatings, GDL thickness, and polytetrafluorethylene (PTFE) loading on the effective water vapor diffusion c...