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采用硝酸氧化法制备氧化多壁碳纳米管(MWNTs-COOH),在其表面引入羧基。以对甲苯磺酸(PTSA)为催化剂、二甲亚砜(DMSO)为溶剂,采用羟丙基-β-环糊精(HP-β-CD)修饰MWNTs-COOH,制备了分散性较好的羟丙基-β-环糊精-多壁碳纳米管(HP-β-CD-g-MWNTs)复合材料。经透射电镜(TEM)、傅里叶变换红外光谱(FT-IR)、热重分析(TGA)等测试后表明,HP-β-CD被成功接枝到多壁碳纳米管(MWNTs)表面。分散性研究结果表明,HP-β-CD-g-MWNTs复合材料在水溶液中的分散能力达到2.3mg/mL,这一属性使得该材料有望成为医学材料或药物载体材料。采用紫外-可见(UV-Vis)吸收光谱法研究扁桃酸与HP-β-CD-g-MWNTs复合材料的相互作用,结果表明扁桃酸可能通过π-π堆积、极性相互作用及氢键吸附在复合材料表面。基于上述分子间作用力的形成,与碳纳米管作用的分子可望实现从碳纳米管表面得到控制释放或缓释。
Oxidation of multi-walled carbon nanotubes (MWNTs-COOH) was prepared by nitric acid oxidation and carboxyl groups were introduced on the surface. MWNTs-COOH was modified with p-toluenesulfonic acid (PTSA) as a catalyst and dimethyl sulfoxide (DMSO) as a solvent and hydroxypropyl-β-cyclodextrin Hydroxypropyl-β-cyclodextrin-multiwalled carbon nanotubes (HP-β-CD-g-MWNTs) composites. The results of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) showed that HP-β-CD was successfully grafted onto the surface of MWNTs. The results of the dispersibility study showed that the dispersibility of HP-β-CD-g-MWNTs composite in aqueous solution reached 2.3mg / mL, which makes the material promising as a medical material or drug carrier material. The interaction between mandelic acid and HP-β-CD-g-MWNTs composites was studied by UV-Vis absorption spectroscopy. The results showed that mandelic acid may be induced by π-π stacking, polar interaction and hydrogen bonding On the composite surface. Based on the formation of the above intermolecular force, the molecules acting on the carbon nanotubes are expected to achieve controlled release or sustained release from the surface of the carbon nanotube.