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Lithium Phosphate Glasses stabilized with Tungsten Oxide
Míka, M. ; Mladonický, P. ; Vondrák, Jiří ; Stopka, Pavel ; Klápště, Břetislav
Glass exhibiting an increased ionic conductivity could be an attractive material for the construction of electrochemical solid-state devices such as ion-selective sensors, batteries, fuel cells, and electrochromic devices. In these devices the glass can function as a membrane, solid electrolyte or electrode if shows mixed electric conductivity. Amorphous nature gives glass considerable advantages comparing to polycrystalline materials.If we use chemical composition systems with a good glass-forming ability, we can add many different cations and this way "tune" glass properties. Because a large portion of glass volume is occupied by oxygen atoms, many glass properties are strongly influenced by the state of oxygen atoms, especially by the the electron density. God glass-forming ability is exhibited for example by alkali-phosphate glass.
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EPR studium vzorků piv a pivovarských materiálů
Stopka, Pavel
Ve vzorcích byly identifikovány a stanoveny hydroxylové (OH.), nitroxidové (NO.) a stabilní organické radikály. Koncentrace těchto radikálů vykazuje maximum po 5-10 min. od otevření láhve. Je popsán vliv UV ozařování a vliv peroxidu vodíku.
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