Ultrafine bismuth oxide powders of high purity were prepared by electrochemical method from an aqueous solution of NaOH in the presence of dispersant.The formation mechanism of Bi2O3 powders was suggested.The effects ...Ultrafine bismuth oxide powders of high purity were prepared by electrochemical method from an aqueous solution of NaOH in the presence of dispersant.The formation mechanism of Bi2O3 powders was suggested.The effects of electrolyte,dispersant and calcining temperature were studied.Its compostion,size and microstructure were determined by IR,XRD and TEM.The results show that the sample is spherodic and dispersed evenly.Its average size is 30～40nm.The electrochemical dissolution of metal anode may be recommended as a promising technique for the synthesis of ultrafine bismuth oxide powders.展开更多
The complexes of Cu with 2-methyl-3-butyn-2-ol(HL) and triphenylphosphine(pph3) or bis (diphenylphophine) methane (dppm) were prepared by an electrochemical method in nonaqueous solutions. The products were characteri...The complexes of Cu with 2-methyl-3-butyn-2-ol(HL) and triphenylphosphine(pph3) or bis (diphenylphophine) methane (dppm) were prepared by an electrochemical method in nonaqueous solutions. The products were characterized by elemental analysis, IR, 1H and 13C NMR measurements as CuL, CuL. pph3 and CuL. dppm respectively.展开更多
Some complexs of Ag(PPh 3 ) n X( n =1,2,3;X=Cl,Br,I) were electrosynthesized using NH 4 X or I 2 in non aqueous medium, in yield >95%. The mechanism of electrochemical reaction and the effect of material ratio on t...Some complexs of Ag(PPh 3 ) n X( n =1,2,3;X=Cl,Br,I) were electrosynthesized using NH 4 X or I 2 in non aqueous medium, in yield >95%. The mechanism of electrochemical reaction and the effect of material ratio on the complexes have been studied. When n (PPh 3 )∶ n (NH 4 X)=3∶1, Ag(PPh 3 ) 2 X(X=Cl,Br) were obtained; when n (PPh 3 )∶ n (NH 4 I/I 2 )=1∶1, AgPPh 3 I was obtained; when n (PPh 3 )∶ n (NH 4 I)= 2∶1 or 3∶1, Ag(PPh 3 ) 3 I was obtained. This method is better than the traditional chemical synthesis.展开更多
文摘Ultrafine bismuth oxide powders of high purity were prepared by electrochemical method from an aqueous solution of NaOH in the presence of dispersant.The formation mechanism of Bi2O3 powders was suggested.The effects of electrolyte,dispersant and calcining temperature were studied.Its compostion,size and microstructure were determined by IR,XRD and TEM.The results show that the sample is spherodic and dispersed evenly.Its average size is 30～40nm.The electrochemical dissolution of metal anode may be recommended as a promising technique for the synthesis of ultrafine bismuth oxide powders.
文摘The complexes of Cu with 2-methyl-3-butyn-2-ol(HL) and triphenylphosphine(pph3) or bis (diphenylphophine) methane (dppm) were prepared by an electrochemical method in nonaqueous solutions. The products were characterized by elemental analysis, IR, 1H and 13C NMR measurements as CuL, CuL. pph3 and CuL. dppm respectively.
文摘Some complexs of Ag(PPh 3 ) n X( n =1,2,3;X=Cl,Br,I) were electrosynthesized using NH 4 X or I 2 in non aqueous medium, in yield >95%. The mechanism of electrochemical reaction and the effect of material ratio on the complexes have been studied. When n (PPh 3 )∶ n (NH 4 X)=3∶1, Ag(PPh 3 ) 2 X(X=Cl,Br) were obtained; when n (PPh 3 )∶ n (NH 4 I/I 2 )=1∶1, AgPPh 3 I was obtained; when n (PPh 3 )∶ n (NH 4 I)= 2∶1 or 3∶1, Ag(PPh 3 ) 3 I was obtained. This method is better than the traditional chemical synthesis.
