大分子壳聚糖对单壁碳纳米管水分散性的影响

Investigation on Water Dispersibility of Single-walled Carbon Nanotubes Functionalized with Macromolecular Chitosan

摘要: 目的利用大分子壳聚糖改善单壁碳纳米管的水分散性。方法采用混酸氧化法(浓硫酸∶浓硝酸=3∶1)对单壁碳纳米管进行羧基化处理。冰浴超声分散法制备壳聚糖修饰的单壁碳纳米管并采用紫外分光光度法、红外分光光度法、差示扫描量热法等进行验证。恒温振荡法考察壳聚糖修饰单壁碳纳米管的水分散性。结果壳聚糖修饰单壁碳纳米管在水、PBS(pH 7.4)及醋酸缓冲液(pH 4.0)中的分散度均有明显增加，分散浓度分别为1.99，2.04，1.76 mg·mL^-1。结论壳聚糖能明显改善单壁碳纳米管的水分散性。

Abstract: OBJECTIVE To improve the poor water solubility of single-walled carbon nanotubes(SWNTs) by using chitosan(CHI). METHODS Carboxyl SWNTs were obtained by mixed acid methods(sulfuric acid and nitric acid 3∶1). CHI modified SWNTs(CHI/SWNTs) were prepared with ice bath ultrasonic dispersion method and characerized by UV, FT-IR and DSC. The dispersibility of CHI/SWNTs in water, PBS(pH 7.4) and acetic acid-sodium acetate buffer(pH 4.0) was determined with constant temperature oscillation methods. RESULTS The maximum dispersion concentration of CHI/SWNTs in water, PBS (pH 7.4) and acetic acid-sodium acetate buffer (pH 4.0) were 1.99, 2.04 and 1.76 mg·mL^-1, respectively, much higher than SWNTs. CONCLUSION Chitosan can significantly improve the water dispersibility of SWNTs.