ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The two pulse electron spin echo (ESE) technique was applied to study the behavior and properties of aqueous solutions of two nitroxide radicals, negatively and positively charged, when adsorbed on different pore size silica gels. The study is carried out at two different concentrations, and the experimental patterns are interpreted via computer simulation. From evaluation of the ESE phase memory, time matrix nuclei were found to play a relevant role in determining the relaxation of the electron spin system. Analysis of the nuclear modulation of the electron spin echo revealed contributions both from water and radical protons. Conclusions are drawn about the radical concentration in the silica gel pores. The larger pore silica gels can reach greater radical concentrations. This confirms a result obtained from previous ESR studies at higher temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.449969
