The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)(3) and Tb(o-CBA)(3) (TTA=thenoyltriffuocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silic...The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)(3) and Tb(o-CBA)(3) (TTA=thenoyltriffuocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+5D0-->F-7(J)(J=0,1,2,3,4), Tb3+5D4-->F-7(J)(J=3,4,5,6) transitions. Compared with the pure RE-complexes powder, the silica gels doped with RE-complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 mu s) in silica gel doped with Tb(o-CBA)3 than in pure Tb((o-CBA)(3) powder (744 mu s). The reasons responsible for these results are discussed in the context.展开更多
METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether wh...METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether which is used as an octane enhancer in gasoline. The search forpotential additives has been carried out since the discovery of the promoting effect. In thisnote, we report the promoting effect of Mn on Cu-Zn-Al catalyst. The results indicated展开更多
OVER three decades, since the wide applications of the soliton phenomena in almost all the physical fields, the theoretical, experimental and applied studies of the soliton have become an active research topic. The di...OVER three decades, since the wide applications of the soliton phenomena in almost all the physical fields, the theoretical, experimental and applied studies of the soliton have become an active research topic. The direct macro-observation of the soliton phenomana is one of the important problems. Since the observation of Wu et al. on the nonpropagating fluid solitons in 1984, the nonlinear systems on the vibratmg table have offered us a good experimental field. Some nonlinear excitations of the macro-monatomic lattice have been observed by Denardo et al. Ref. reported the observation of the localized structure of the granular sys-展开更多
基金Project supported by the National Natural Science Foundation of China and Foundation of the National Personnel Ministry of China.
文摘The luminescence properties of silica gels and silica gels doped with two rare earth complexes, Eu(TTA)(3) and Tb(o-CBA)(3) (TTA=thenoyltriffuocetate, o-CBA=o-chlorobenzoic acid) are reported and discussed. Pure silica gels show a blue luminescence, and the maximum excitation and emission wavelengths depend strongly on the solvents used. Both of the studied rare earth complexes exhibit the characteristic emissions of the rare earth ions in silica gels, i.e., Eu3+5D0-->F-7(J)(J=0,1,2,3,4), Tb3+5D4-->F-7(J)(J=3,4,5,6) transitions. Compared with the pure RE-complexes powder, the silica gels doped with RE-complexes show fewer emission lines of the rare earth ions. Furthermore the rare earth ion (Tb3+) presents a longer lifetime (1346 mu s) in silica gel doped with Tb(o-CBA)3 than in pure Tb((o-CBA)(3) powder (744 mu s). The reasons responsible for these results are discussed in the context.
文摘METHANOL is a chemical manufactured world-wide and its production is of interest from bothindustrial and academic points of view. It is used as gasoline extenders and in the manufac-ture of methyl tetra-butyl ether which is used as an octane enhancer in gasoline. The search forpotential additives has been carried out since the discovery of the promoting effect. In thisnote, we report the promoting effect of Mn on Cu-Zn-Al catalyst. The results indicated
文摘OVER three decades, since the wide applications of the soliton phenomena in almost all the physical fields, the theoretical, experimental and applied studies of the soliton have become an active research topic. The direct macro-observation of the soliton phenomana is one of the important problems. Since the observation of Wu et al. on the nonpropagating fluid solitons in 1984, the nonlinear systems on the vibratmg table have offered us a good experimental field. Some nonlinear excitations of the macro-monatomic lattice have been observed by Denardo et al. Ref. reported the observation of the localized structure of the granular sys-
