Monte Carlo simulation of the radiolysis of the ceric sulfate dosimeter by low linear energy transfer radiation

The ceric sulfate dosimeter is based on the radio-induced reduction of Ce4+ in acidic medium. For low linear energy transfer (LET) radiation, the yield of Ce3+ is 2.4 molecules / 100 eV, regardless of the presence of oxygen. To investigate the reaction mechanisms of the ceric sulfate dosimeter, we simulated the chemical reaction kinetics curves and the evolution of G(Ce3+), G(O2), and G(H2) in the ceric sulfate solution with and without oxygen. Studies of G(Ce3+) as function of the initial concentration of Ce3+ and of the LET were also done. One important finding of this study is that •OH radicals are scavenged by the reaction •OH + HSO4– → SO4•– + H2O, rather than by the reaction •OH + Ce3+ → Ce4+ + OH–.

Effect of Rare Earth Salt on Ceramic Membrane Formed by Micro-Arc Oxidation

TiO2 layers were fabricated via micro-arc oxidation process in the electrolyte of adding rare earth and in original electrolyte solution respectively .The ceramic membrane and the change of voltage were analysed.The results indicated, the ceramic membrane were formed faster in electrolyte solution of addingrare earth. Surface morphology and voltage changed obviously by adding rare earth salt. The optimal concentration of ceric sulfate and lanthanum nitrate were 0.018 mol /L and 0.046 mol /L respectively.

Ceric-sulfate-catalyzed synthesis of 14-aryl- or 14-alkyl-14H-dibenzo[aj]xanthene under conventional heating and microwave irradiation

A simple and facile procedure for the synthesis of 14-aryl- or 14-alkyl-14H-dibenzo[aj]xanthenes is described. The procedure takes place by the one-pot condensation of 2-naphthol with aldehydes in the presence of anhydrous ceric sulfate as the catalyst under solvent-free conventional heating and microwave irradiation.Key words: xanthene, one-pot condensation, aldehyde, 2-naphthol, ceric sulfate, solvent-free, microwave irradiation.