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- 저자 : Z. S. Revay (검색결과 2 건)
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Babcock, E.,Szekely, N.,Konovalova, A.,Lin, Y.,Appavou, M.-S.,Mangiapia, G.,Revay, Z.,Stieghorst, C.,Holderer, O.,Henkensmeier, D.,Lehnert, W.,Carmo, M. Elsevier 2019 Journal of membrane science Vol.577 No.-
<P><B>Abstract</B></P> <P>Potassium hydroxide (KOH) doped polybenzimidazole (PBI) membranes are investigated as compelling candidates for water electrolysis applications, drastically reducing the ohmic losses in contrast to thick ZrO<SUB>2</SUB> based diaphragms. Using small angle neutron scattering (SANS) we have found that the structure of the (KOH doped) PBI changes with doping time on a minute time scale, and that the development of the structure is highly dependent on the KOH concentration. This data is correlated with macroscopic measurements of membrane swelling resulting from the doping process which also occurs on a minute time scale. Then, using prompt gamma activation analysis (PGAA) to follow the changes in time of the chemical composition, we have found that the K concentration of these samples only increases slightly with doping times after a very rapid initial uptake, reaching a saturation value that is relatively independent of KOH concentration for long doping times of up to 24 h. However measurements of similarly doped samples show increases in ion-conductivity of nearly 3 fold, and resistivity reductions of over 2 fold on the same time scales. These measurements prove that PGAA is a sensitive method to follow changes in the chemical compositions during doping, while SANS can give information on the sub-micro structural changes of polymer electrolyte membranes. Since these methods can be correlated with <I>ex-situ</I> measurements of composition, resistance, ion-conductivity and macro-structure, the combined use of PGAA and SANS provides a promising means for <I>in-operando</I> study in order to elucidate changes in membrane performance due to electrochemical cycling, as well as to help characterize and optimize doping parameters though in-situ doping measurements, by enabling real-time study of such membrane systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Elucidating the doping of Alkali-doped Polybenzimidazole membranes. </LI> <LI> Complementary structure and composition information from SANS and PGAA to study functional membranes. </LI> <LI> Structure varies over doping time for KOH doped Polybenzimidazole membranes. </LI> <LI> New possibilities for in-situ and in-operando characterization. </LI> </UL> </P>
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Gamma Spectrum from Neutron Capture on Tungsten Isotopes
A. M. Hurst,N. C. Summers,B. W. Sleaford,R. B. Firestone,T. Belgya,Z. S. Revay 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
An evaluation of thermal neutron capture on the stable tungsten isotopes is presented, with preliminary results for the compound systems ^(183,184,185,187)W. The evaluation procedure compares the γ-ray cross-section data collected at the Budapest reactor, with Monte Carlo simulations of γ-ray emission following the thermal neutron-capture process. The statistical-decay code DICEBOX was used for the Monte Carlo simulations. The evaluation yields new γ-rays in ^(185)W and the confirmation of spins in ^(187)W, raising the number of levels below which the level schemes are considered complete, thus increasing the number of levels that can be used in neutron data libraries.
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