Waterborne nanoscale carbon black dispersion （NCBD） was widely used in inkjet printing, spun.dyeing fibers and coloration fabrics. In this paper, NCBD was prepared using sodium carboxymethyl cellulose （CMC） as dis...Waterborne nanoscale carbon black dispersion （NCBD） was widely used in inkjet printing, spun.dyeing fibers and coloration fabrics. In this paper, NCBD was prepared using sodium carboxymethyl cellulose （CMC） as dispersant. Effects of CMC viscosity, ultrasonic time and oxidation with hydrogen peroxide on carbon black （CB） particle size were discussed. The results showed that CB particle size decreased by mechanical agitation while it Increased by ultrasonic with the increase of CMC viscosity. Uitrasonk is a more effective method to disperse CB particles than that of mechanical agitation. CB particle size lbviously decreased with itcreasing ultrasonic time and arrived at about 160 nm for 60min.In addition,oxidation with 2 mol/L of H2O2 and 0.2wt% of CMC300 reduced CB particle size to 160nm at 90℃ for 2.5h.展开更多
The synthesis of polycrystalline aluminum oxynitride （AlON） powders was investigated by the carbothermal reduction and ni- tridation （CRN） of amorphous precursor obtained by wet chemical processing. Co-precipitati...The synthesis of polycrystalline aluminum oxynitride （AlON） powders was investigated by the carbothermal reduction and ni- tridation （CRN） of amorphous precursor obtained by wet chemical processing. Co-precipitation processing was employed to achieve amorphous precursor from AI（NO3）3 solution dispersed by nanosized carbon particles, which was composed of AI（OH）3 and C particles homogeneously. The effects of the content of carbon black, pH value, and calcination temperature on formation of A1ON phase were investigated by means of XRD, SEM and TEM, respectively. It was found that single phase AION powder could be synthesized when the resultant precursors were calcined at 1750℃ for 2 hours under flowing N2. Un- der optimal additional content of C （5.6wt%）, the resultant A1ON powders exhibited the primary particle size of about 1-3 μm with a specific surface area of 3.2 m2/g, which were superior to that of carbothermal reduction of immediate mixture of γ-A1203/C powders.展开更多
基金Supported by National Natural Science Foundation of China( No.50173012) and863Hi-tech Research and Development Program ofChina (2002AA327120)
文摘Waterborne nanoscale carbon black dispersion （NCBD） was widely used in inkjet printing, spun.dyeing fibers and coloration fabrics. In this paper, NCBD was prepared using sodium carboxymethyl cellulose （CMC） as dispersant. Effects of CMC viscosity, ultrasonic time and oxidation with hydrogen peroxide on carbon black （CB） particle size were discussed. The results showed that CB particle size decreased by mechanical agitation while it Increased by ultrasonic with the increase of CMC viscosity. Uitrasonk is a more effective method to disperse CB particles than that of mechanical agitation. CB particle size lbviously decreased with itcreasing ultrasonic time and arrived at about 160 nm for 60min.In addition,oxidation with 2 mol/L of H2O2 and 0.2wt% of CMC300 reduced CB particle size to 160nm at 90℃ for 2.5h.
文摘The synthesis of polycrystalline aluminum oxynitride （AlON） powders was investigated by the carbothermal reduction and ni- tridation （CRN） of amorphous precursor obtained by wet chemical processing. Co-precipitation processing was employed to achieve amorphous precursor from AI（NO3）3 solution dispersed by nanosized carbon particles, which was composed of AI（OH）3 and C particles homogeneously. The effects of the content of carbon black, pH value, and calcination temperature on formation of A1ON phase were investigated by means of XRD, SEM and TEM, respectively. It was found that single phase AION powder could be synthesized when the resultant precursors were calcined at 1750℃ for 2 hours under flowing N2. Un- der optimal additional content of C （5.6wt%）, the resultant A1ON powders exhibited the primary particle size of about 1-3 μm with a specific surface area of 3.2 m2/g, which were superior to that of carbothermal reduction of immediate mixture of γ-A1203/C powders.
