Physics: Recent submissions

Now showing items 241-247 of 247

Investigation of Fundamental Transport Properties and Thermodynamics in Diglyme?Salt Solutions

Petrowsky, M.; Frech, R.; Suareza, S.N. (Journal of Physical Chemistry B, 2006)

Ionic mobility, the thermodynamics of ionic association, and the structure of associated species are studied in solutions of diglyme containing either lithium triflate or tetrabutylammonium triflate. Infrared spectroscopic, ...
NMR investigation of water and methanol transport in sulfonated polyareylenethioethersulfones for fuel cell applications

Jayakody, J.R.P.; Khalfana, A.; Mananga, E.S.; Greenbaum, S.G.; Dang, T.D.; Mantz, R. (Journal of Power Sources, 2006)

We report an investigation of water and methanol transport in polymer electrolyte membranes based on highly sulfonated polyarelenethioethersulfones (SPTES) for direct methanol fuel cell (DMFC) applications. Measurements ...
High Pressure NMR Study of Water Self-Diffusion in NAFION-117 Membrane

Jayakody, J.R.P.; Stallworth, P.E.; Mananga, E.S.; Farrington-Zapata, J.; Greenbaum, S.G. (Journal of Physical Chemistry B, 2004)

Measurements of the self-diffusion coefficient of water in NAFION-117 as a function of pressure have been carried out. The natural field gradient of a 7.3 T superconducting magnet was used for the diffusion measurement. ...
An investigation of rain and wind effects on thermal stability of large-area saltpan solar ponds

Punyasena, M.A.; Amarasekara, C.D.; Jayakody, J.R.P.; Perera, P.A.A.; Ehamparam, P. (Solar Energy, 2003)

An investigation of the thermal stability of large area saltpan solar ponds under different climatic conditions is presented. The study focuses on time taken by the pond to reach its stable conditions with heavy rainfall ...
A multinuclear NMR study of ion transport in P(EO)nLiBETI complexes

Suarez, S.N.; Abbrent, S.; Jayakody, J.R.P.; Greenbaum, S.G.; Shin, J.H.; Passerini, S. (Solid State Ionics, 2005)

A study of ion transport in P(EO)nLiBETI complexes was undertaken, using both AC impedance and nuclear magnetic resonance (NMR) spectroscopy. 1H, 7Li and 19F NMR techniques were used to investigate structure and dynamics ...
Characterization of single walled carbon nanotube: Polyvinylene difluoride composites

Owensa, F.J.; Jayakody, J.R.P.; Greenbaum, S.G. (Composites Science and Technology, 2006)

Composites of polyvinylene difluoride (PVdF) and single walled carbon nanotubes (SWNTs) produced by evaporation of suspensions of PVdF and SWNTs in acetone while being subjected to sonication are characterized. Raman ...
High pressure studies of hydrated NAFION membranes: Dielectric relaxation and deuteron NMR

McLin, M.G.; Wintersgill, M.C.; Fontanella, J.J.; Chen, R.S.; Jayakody, J.R.P.; Greenbaum, S.G. (Solid State Ionics, 1993)

Audio frequency electrical conductivity/dielectric relaxation and nuclear magnetic resonance studies of NAFION-117 have been carried out at pressures up to 0.3 GPa (3 kbar). For some samples, the electrical conductivity ...

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