- Thursday, March 12, 2009
- Published at:Taibah Journal of Science
- A new method of preparing thin film metal-hydride electrodes for metal-hydride batteries is described. The method consists of simultaneous deposition of multi-component metallic species onto a substrate while bombarding the growing, deposited thin film electrode with a low energy hydrogen ion beam. An amorphous LaNi4 hydride thin film electrode has been prepared by this Hydrogen Ion Beam Assisted Deposition (HIBAD) technique. The electrochemical discharge capacity and cycle life of this electrode in a 6 M KOH solution surpass previously reported values for La-Ni thin film electrodes prepared by other deposition methods.
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- Thursday, March 12, 2009
- Published at:Land Contamination & Reclamation
- In this study a nonionic surfactant, Triton X-100 was used to study the sorption characteristics of organic contents in soil. The surface tension is used for calculating this kind of sorption. The results indicated that when the concentration of surfactant was lower than the CMC, the amount of surfactant sorbed on soil increased with the increasing surfactant concentration and the surfactant sorption characteristics of the uncontaminated soil could be modeled by the Freundlich isotherm. For the contaminated soils, the amount of surfactant sorbed was higher than those for the uncontaminated soils.
Capsule: Relation between CMC, and surfactant sorbed on soil.
Number of words = 100
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- Wednesday, February 4, 2009
- Published at:Journal of Analytical and Applied Pyrolysis
- Heat treatment of polyacrylonitrile (PAN) leads to products with semiconductor to metal-like conductivities. The electrical properties of these-materials are further modified by ion implantation. It is noted that the conductivity (10−7(Ω cm)−1 of heat treated PAN at 435 °C (PAN435) increases upon ion implantation with arsenic reaching a maximum value of 1.4 × 10−1 (Ω cm)−1 at a dose of 5 × 1016 ion/cm2 and energy of 200 KeV. On the other hand, ion implantation of the more conducting heat treated PAN at 750 °C (PAN750) leads to a decrease in the electrical conductivity of the material. The data also indicate that the decrease in conductivity observed after implantation of PAN750 is due to the breakup of the graphite-like extended electronic states. The temperature dependence of conductivity provided further information on the structures of the pyrolyzed and of the ion implanted samples. Whereas the conductivity
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- Tuesday, July 1, 2008
- Published at:Journal of Analytical and Applied Pyrolysis, Volume 82, Issue 2, July 2008, Pages 235-239
- Infrared (IR), Auger electron spectroscopy (AES) and X-ray photoelectron spectra (XPS) of pristine, pyrolyzed, and ion-implanted poly(acrylonitrite) (PAN) samples were obtained in order to correlate the structural changes accompanying pyrolysis and implantation with the electrical properties of the respective PAN products. The results show that PAN is first converted to a polyconjugated heterocyclic ladder structure at a temperature of 435 °C and then to a graphite-like structure at temperature above 750 °C. Pyrolysis studies took place in a temperature range of 350–750 °C. IR studies showed that upon heat treatment at 435 °C, major structural changes occur as indicated by the complete disappearance of the nitrile and methylene absorption bands and the formation of new bands. The degree of conjugation in pyrolyzed PAN can be selectively controlled by the proper choice of the heat treatment temperature. From the studies, ion implantation causes extensive nitrogen deple
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- Tuesday, January 1, 2008
- Published at:Land Contamination & Reclamation, Volume 16, Number 1, 2008 , pp. 35-44(10)
- Hydrophobic and non-polar organic carbon compounds have low aqueous solubilities, and the biodegradation of such compounds may be restricted because of their low solubility coupled with strong binding/sorption on to solids. The main goal of this research is to study the factors affecting the sorption of surfactants on to soil, such as the surfactant concentration and the soil organic content, and the removal of organic contaminants like decane from the soil using a non-ionic surfactant, Triton X-100. The results indicated that when the concentration of surfactant was lower than the critical micelle concentration (CMC), the amount of surfactant sorbed on to soil increased with increasing surfactant concentration, and the surfactant sorption characteristics of the uncontaminated soils could be modelled using the Freundlich isotherm. For the contaminated soils, the amount of surfactant sorbed was higher than that for the uncontaminated soils. The amount of surfactant sorbed on to soils also depends on the organi
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Shehdeh W. Jodeh