表面氧化改性对碳气凝胶的分散性和导电性的影响.pdfVIP

黄华庆 徐云龙 张书诚 江 琼 姜复松 (, 200237) 为了得到具有优良的分散性和导电性的碳气 胶,研究了碳气 胶的硝酸氧化改性温度对碳气 胶的结构和性能的影响通过 FTIRPSZeta电位RD和N 等温吸附-脱附等技术对样品进行表征, 结 2 果表明:硝酸氧化改善分散性的机理在于对碳气 胶表面的含氧官能团数量的改变, 而且氧化温度越高,含氧 官能团的数量就越多,碳气 胶的分散性就越好; 与此相反,较低温度的氧化处理有利于保持碳气 胶的导电性 (40 , 87. 7% ), 而高温氧化由于易使碳气 胶的微孔迅速增多从而导致其电导率急剧下降( 100 , 2. 5% ) 碳气 胶, 氧化改性,分散性, 电导率 Effect of SurfaceModification onDispersion andElectric Conductivity ofCarbonAerogels HuangHuaqing u Yunlong Zhang Shucheng Jiang Q iong Jiang Fusong (Key Laboratory forU ltrafineM aterials ofM inistry ofEducation, SchoolofM aterials Science and Engineering, EastChinaUniversity ofScience andTechnology, Shanghai 200237) Abstract The temperature of oxidation modification of carbon aerogels by using nitric acid and the influence of the oxidation temperature on its structure and propertywas studied in order to obtain the carbon aerogelsw ith good dis persion and electric conductivity. Carbon aerogelsbefore and after oxidation treatm entwere characterized by the FTIR, PS, Zetapotential, RD andN isothermaladsorptiondesorption techniques. Itwas found that the dispersion stabili 2 ty of the carbon aerogelswas closely associated w ith the oxygencontaining functionalgroups on the surface. For com parison, conductivity of carbon aerogelswaswellkept after oxidation treatmentbyHNO at low temperature rather than 3 that at high temperature (40 , 87. 7% vs. 100 , 2. 5% ), which was attributed to the higher number of m icro pores formed at high temperature. K ey words Carbon aerogels, Oxidativemodification, Dispersion performance, E lectricalconductivity 1 , Kamega