Search

Your search keyword '"Hnatowicz, V."' showing total 846 results
Start Over Author "Hnatowicz, V."
846 results on '"Hnatowicz, V."'

211. Lithium diffusion in polyether ether ketone and polyimide stimulated by in situ electron irradiation and studied by the neutron depth profiling method.

Author

Vacik, J., Hnatowicz, V., Attar, F.M.D., Mathakari, N.L., Dahiwale, S.S., Dhole, S.D., and Bhoraskar, V.N.

Subjects
*LITHIUM, *KETONES, *POLYIMIDES, *ATOMS, *DIFFUSION
Abstract

Diffusion of lithium from a LiCl aqueous solution into polyether ether ketone (PEEK) and polyimide (PI) assisted byin situirradiation with 6.5 MeV electrons was studied by the neutron depth profiling method. The number of the Li atoms was found to be roughly proportional to the diffusion time. Regardless of the diffusion time, the measured depth profiles in PEEK exhibit a nearly exponential form, indicating achievement of a steady-state phase of a diffusion–reaction process specified in the text. The form of the profiles in PI is more complex and it depends strongly on the diffusion time. For the longer diffusion time, the profile consists of near-surface bell-shaped part due to Fickian-like diffusion and deeper exponential part. [ABSTRACT FROM PUBLISHER]

Published
2014
Full Text
View/download PDF

212. Coupled chemical reactions in dynamic nanometric confinement: V. The influence of Li and F ions on etching of nuclear tracks in polymers.

Author

Fink, D., Muñoz Hernandez, G., Ruiz, N.L., Vacik, J., Hnatowicz, V., García-Arellano, H., Alfonta, L., and Kiv, A.

Subjects
CHEMICAL reactions, POLYMERS, LITHIUM ions, PARTICLE tracks (Nuclear physics), ELECTRIC currents, NANOFLUIDICS
Abstract

Etching of continuous nuclear tracks in thin polymer foils from both sides is known to lead to the formation of double-conical nanopores. In this work and related ones we try to find out how this etching kinetics is modified when materials are added which react with each other upon their contact towards some new product that influences the etching. For that purpose we have chosen here Li+and F−ions as the additions, which react with each other to form LiF precipitations. The coupled etching and precipitation kinetics is recorded by measuring the electrical current that is transmitted through the foils upon application of a low-frequency alternating sinusoidal voltage. Depending on the etchant concentrations, the etching temperature and the time of Li+and F−addition, different effects are found that range from (a) no alteration of the transmitted current at all, via (b) the emergence of an alternating current with a temperature-dependent amplitude, and (c) the complete vanishing of any transmitted current at all, towards (d) chaotic transmitted current histories with phases with strong current spike emission and (e) rather quiet phases, alternating with each other in a rather unsystematic way. The observed effects are ascribed to (a) the enhanced penetration efficiency of both the Li+and F−ions through the polymeric bulk and/or latent ion tracks after the removal of the polymer's protective surface layer by the etchant, (b) the high mobility of preferentially the F−ions within the polymer, (c) the LiF precipitation within the polymer or on its surface upon encounter of Li+and F−ions, (d) the nanofluidic properties of narrow etched tracks covered with Li+ions on the wall surfaces and F−ions beyond, and/or (e) the formation of LiF membranes within the etched tracks. [ABSTRACT FROM PUBLISHER]

Published
2014
Full Text
View/download PDF

217. On ion track geometry in the etching process

Author

Vacik, J., primary, Cervena, J., additional, Hnatowicz, V., additional, Posta, S., additional, Fink, D., additional, Naramoto, H., additional, Kobayashi, Y., additional, Hirata, K., additional, and Strauss, P., additional

Published
1999
Full Text
View/download PDF

223. High Fluence Ion Irradiation of Thin Fullertte Films

Author

Fink, D., primary, Müller, M., additional, Szimkowiak, P., additional, Döbeli, M., additional, Spieler, A., additional, Grether, M., additional, Richter, A., additional, Chadderton, L. T., additional, Zawislak, F. C., additional, Grande, P. F. P., additional, Behar, M., additional, Hnatowicz, V., additional, and Vacikr, J., additional

Published
1998
Full Text
View/download PDF

228. Lithium Implantation into Fullerite

Author

Fink, D., primary, Ghosh, S., additional, Klett, R., additional, Palmetshofer, L., additional, Vacik, J., additional, Hnatowicz, V., additional, Cervena, J., additional, Kaschny, J., additional, Zawislak, F. C., additional, Sanchez, P., additional, and Behar, M., additional

Published
1998
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results