Solubility increase of multi-walled carbon nanotubes in water
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摘要: 采用NaOH/H2O2氧化法合成了羟基化水溶性多壁碳纳米管(MWCNTols)。通过正交实验法对反应条件进行了优化，并采用TEM、SEM、拉曼光谱等手段对样品进行了表征。MWCNTols在水溶液中的溶解度可达0.72mg/mL。在此基础上将MWCNTols经聚乙烯吡咯烷酮（PVP）包裹后合成了PVP-MWCNTols。由于PVP良好的亲水性进一步增强了包裹产物在水中的分散性能，其溶解度可达2.34mg/mL，且水溶液均匀、稳定，在室温下保存60 d以上不发生聚集和沉淀。PVP-MWCNTols中MWCNTols的质量分数为41%。Abstract: Water-soluble hydroxylated multi-wall carbon nanotubes (MWCNTols) were synthesized by the NaOH/H2O2 oxidation method. A L9(34) orthogonal experimental design was used to optimize the preparation conditions, and TEM, SEM and Raman spectroscopy were used to characterize the products. The solubility of as-prepared MWCNTols in water was 0.72 mg/mL. Furthermore, MWCNTols were wrapped by polyvinylpyrrolidone (PVP) by solution blending. Good water-solubility of PVP further increases the stability and dispersibility of MWCNTols in water. The content of MWCNTols in PVP-MWCNTols is calculated to be as high as 41 mass%. The solubility of PVP-MWCNTols in water was up to 2.34 mg/mL. No aggregation or sedimentation was observed for a saturated solution during more than 2 month storage at room temperature.
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