Silica gel luminophors containing 1, 10-phenanthroline-tris(M-Methylbenzoate) europium (or terbium) com- plexes were prepared bysol-gel method. The thermal decomposition, excitation and emissionspectra for the gel pho...Silica gel luminophors containing 1, 10-phenanthroline-tris(M-Methylbenzoate) europium (or terbium) com- plexes were prepared bysol-gel method. The thermal decomposition, excitation and emissionspectra for the gel phos- phors were measured and compared with thatof solid complex powders. The thermal stability of the complexes wasen- hanced in SiO_2 host matrix and the luminescence intensityremained unchanged.展开更多
In this paper, the membrane capacitance (Cm), which was obtained from the electro- chemical impedance spectroscopy (EIS) method, was used to characterize the effect of pH value on the self-assembled monolayers (SAMs) ...In this paper, the membrane capacitance (Cm), which was obtained from the electro- chemical impedance spectroscopy (EIS) method, was used to characterize the effect of pH value on the self-assembled monolayers (SAMs) of octadecanethiol(18SH) for the first time. The results not only strongly proved that inorganic ions could penetrate the SAMs of 18SH, but also ascertained that SAMs of 18SH were not an absolute of free of ion-penetration. Verifying the existence of pin-holes in the octadecanethiol SAMs was the main contribution of this paper, which coincided with the former conjecture very well.展开更多
Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·...Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .展开更多
基金This project is financially supported by Natural Science Foundation of Hebei Province, China (No. 299193)
文摘Silica gel luminophors containing 1, 10-phenanthroline-tris(M-Methylbenzoate) europium (or terbium) com- plexes were prepared bysol-gel method. The thermal decomposition, excitation and emissionspectra for the gel phos- phors were measured and compared with thatof solid complex powders. The thermal stability of the complexes wasen- hanced in SiO_2 host matrix and the luminescence intensityremained unchanged.
基金This work was supported by the NNSFC (29973026).
文摘In this paper, the membrane capacitance (Cm), which was obtained from the electro- chemical impedance spectroscopy (EIS) method, was used to characterize the effect of pH value on the self-assembled monolayers (SAMs) of octadecanethiol(18SH) for the first time. The results not only strongly proved that inorganic ions could penetrate the SAMs of 18SH, but also ascertained that SAMs of 18SH were not an absolute of free of ion-penetration. Verifying the existence of pin-holes in the octadecanethiol SAMs was the main contribution of this paper, which coincided with the former conjecture very well.
文摘Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .
