ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 39, (2) 69 - 72 (1995)


WETNESS EFFECT ON EPR Cu(II) SPIN LABEL IN HEAT TREATED SILICA XEROGELS
 
Liška Marek 1, Mazúr Milan 2, Hulínová Hana 1, Pelikán Peter 2, Valko Marián 2, Nerád Ivan 1
 
1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Martina Rázusa, 911 01 Trenčín, Slovak Republic
2 Department of Physical Chemistry, Faculty of Chemical Technology, Slovak Technical University, 812 37 Bratislava, Slovak Republic

The present paper deals with drying of SiO₂ xerogel that leads to the decrease of the intensity of Cu(ll) spin probe EPR signal and to the signa/noise ratio as well. This effect is explained by changes of Cu(II) coordination into an EPR less sensitive one. During a sample dehydration the decrease of electric permittivity causes the increase of the dipole interaction between Cu(II) coordination polyhedral, which plays an important role in decreasing EPR signal.


PDF (0.4 MB)
 
Licence Creative Commons © 2015 - 2024
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact