Processes of luminescence quenching in study of molecular oxygen diffusion in glassy matrices.
The methods have been developed for studying oxygen mobility by donor quenching in solutions with uniform concentration and in geminate pairs in a solid phase. It is shown that the kinetics of luminescence variations with time is described by a diffusion model. Oxygen mobility has been studied at low temperatures (77 K) in hard polymer matrices. squalane. glasses of low-molecular hydrocarbons and alcohols. The methods can be used to measure very low oxygen mobility with a diffusion coefficient of about 10(-23) cm2 s(-1).
Korolev
V V
VV
Institute of Chemical Kinetics and Combustion, ul Institutskaya 3, Novosibirsk, Russia.
Bazhin
N M
NM
D004058:Diffusion; D005453:Fluorescence; D005898:Glass; D049449:Luminescence; D010100:Oxygen / Q000737:chemistry*; D011108:Polymers; D012996:Solutions; D013997:Time Factors
D011108:Polymers; D012996:Solutions; D010100:Oxygen