Oxidation gamma irradiation-induced

Roots R, Chatterjee A, Blakely E, Chang P, Smith K, Tobias C (1982) Radiation responses in air-, nitrous oxide-, and nitrogen-saturated mammalian cells. Radiat Res 92 245-254 Roots R, Chatterjee A, Chang P, Lommel L, Blakely EA (1985) Characterization on hydroxyl radical-induced damage after sparsely and densely ionizing irradiation. Int J Radiat Biol 47 157-166 Roti Roti JL, Cerutti PA (1974) Gamma-ray induced thymine damage in mammalian cells. Int J Radiat Biol 25 413-417... 

This initiation reaction can be induced by different factors, both physical (temperature, shear stress, gamma irradiation, etc) and chemical (pro-oxidants, radical initiators...). In the presence of oxygen, it can react easily with the originated radicals practically without activation energy leading to primary and secondary peroxide radicals (ROO ), which feed the complex oxidation cycle (Reactions 1 and 2, Scheme 2.2) [62, 63]. The rate constant for the most alkyl radicals with oxygen is of the order of 10 -10 moF sT... 

FIGURE 29.10 ESR spectnim recorded as a function of time at room temperature to monitor the growth of the oxygen-induced radical. (A) GUR 4150 bar irradiated with X-ray for 1.3 hours in air and stored in air at room temperature. (B) GUR 4120 was gamma irradiated in an evacuated quartz tube and then stored for 6 years at 75°C in a vacuum. The sample was then removed from the mbe to allow oxidation to occur at room temperature. 

Advanced oxidation processes (AOP) can be classified using their manner of OH radical production. The most known AOP in water treatment is the combination of ozone with H2O2. Other AOP include the UV-induced AOP (UV/H2O2, UV/ozone, UV/Ti02), Fenton and Photo-Fenton processes, sonolytically induced AOP and those AOP which create OH radicals directly from water by homolysis (gamma radiolysis/electron beam injection, VUV-irradiation). In the following chapters, each technology is discussed with respect to MTBE elimination. 

The other interesting group of radiation-induced silver nanoclusters looking for possible catalytic applications are those based on zeolites. In this case, Ag+ cations are loaded into zeolites by cation exchange with an AgN03 solution at room tanperature. The product is dried, the metal ions oxidize and are then irradiated by gamma rays at 77 K (Sadlo et al. 2006). 

UHMWPE Oxidation Induced by Gamma or E-Beam Irradiation... 

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