The copper complex pearlescent pigment was synthesized by the two steps diazotization and azo coupling. The crystal phases and the microstructure of the copper complex pearlescent pigment powders were characterized th...The copper complex pearlescent pigment was synthesized by the two steps diazotization and azo coupling. The crystal phases and the microstructure of the copper complex pearlescent pigment powders were characterized through a combination of DSC, FT-IR and SEM analysis after purification. The results indicated that the copper complex pearlescent pigment has very good thermal stability and the fine particle size is uniformly distributed, and the average grain size is around 15 μm.展开更多
A clean preparation of aryl diazonium ions using methyl nitrite is described. Further reaction of the aryl diazonium ions with substituted benzenamine, substituted phenol and nathphol in deferent kinds of diazotizatio...A clean preparation of aryl diazonium ions using methyl nitrite is described. Further reaction of the aryl diazonium ions with substituted benzenamine, substituted phenol and nathphol in deferent kinds of diazotization has been developed. In order to improve the water-solubility of the products, azo coupling reactions of sodium sulfanilate hydrochloride diazonium ions were also performed. The procedures are easy operations, environmentally benign conditions and high yields of the products with potential use as azo-dyes and pigments. Furthermore, no nitrous acid is produced during the diazotization which avoided the formation of dark decomposition products of the corresponding aromatic amine. Proposed mechanism is presented according to our procedure.展开更多
The surface photovoltaic properties of four azo pigments(A, B, C, D) were studied by surface photovoltage spectra (SPS) and field induced surface photovoltage spectra (FISPS). The SPV responses of samples A and D were...The surface photovoltaic properties of four azo pigments(A, B, C, D) were studied by surface photovoltage spectra (SPS) and field induced surface photovoltage spectra (FISPS). The SPV responses of samples A and D were all enhanced when a negative electric field was applied and were all weaken when a positive voltage was applied. It shows that samples A and D indicate n type characteristics. On the contrary, samples B and C indicate p type characteristics. Combining with phase technique and molecular structure of azo pigments, the effect of group on Fermi energy level and conduction type of azo pigments was discussed.展开更多
文摘The copper complex pearlescent pigment was synthesized by the two steps diazotization and azo coupling. The crystal phases and the microstructure of the copper complex pearlescent pigment powders were characterized through a combination of DSC, FT-IR and SEM analysis after purification. The results indicated that the copper complex pearlescent pigment has very good thermal stability and the fine particle size is uniformly distributed, and the average grain size is around 15 μm.
文摘A clean preparation of aryl diazonium ions using methyl nitrite is described. Further reaction of the aryl diazonium ions with substituted benzenamine, substituted phenol and nathphol in deferent kinds of diazotization has been developed. In order to improve the water-solubility of the products, azo coupling reactions of sodium sulfanilate hydrochloride diazonium ions were also performed. The procedures are easy operations, environmentally benign conditions and high yields of the products with potential use as azo-dyes and pigments. Furthermore, no nitrous acid is produced during the diazotization which avoided the formation of dark decomposition products of the corresponding aromatic amine. Proposed mechanism is presented according to our procedure.
文摘The surface photovoltaic properties of four azo pigments(A, B, C, D) were studied by surface photovoltage spectra (SPS) and field induced surface photovoltage spectra (FISPS). The SPV responses of samples A and D were all enhanced when a negative electric field was applied and were all weaken when a positive voltage was applied. It shows that samples A and D indicate n type characteristics. On the contrary, samples B and C indicate p type characteristics. Combining with phase technique and molecular structure of azo pigments, the effect of group on Fermi energy level and conduction type of azo pigments was discussed.
基金This work was financed by the NSFC(No 90201009) and also by the Natural Science Foundation of Zhejiang Province,China(No.ZC0101)and by the fund for PhD s program of Higher Education in China.