Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China.
Nanotechnology. 2010 Feb 26;21(8):85706. doi: 10.1088/0957-4484/21/8/085706. Epub 2010 Jan 25.
The unpaired electrons on multi-walled carbon nanotubes (MWNTs) treated by nitric-sulfuric mixed acid were detected and characterized by electron spin resonance (ESR). Through reacting with these unpaired electrons, highly soluble acrylamide-grafted MWNTs were successfully prepared and characterized by ESR, FT-IR, UV-vis and atomic force microscopy (AFM), etc. The results indicate that MWNTs could generate more unpaired electrons with longer mixed-acid treatment time and could be well functionalized by acrylamide. By AFM analysis, a 'net' structure was formed on MWNTs after grafting with acrylamide. This new method has some obvious advantages of mild reaction conditions and convenient operation, etc. Furthermore, the grafting of MWNTs may have great potential for biomedical applications in drug delivery and regenerative medicine owing to their excellent networks.
经硝酸-硫酸混合酸处理的多壁碳纳米管 (MWNTs) 上的未配对电子通过电子自旋共振 (ESR) 进行了检测和表征。通过与这些未配对电子反应，成功制备了高溶解性的丙烯酰胺接枝 MWNTs，并通过 ESR、FT-IR、UV-vis 和原子力显微镜 (AFM) 等进行了表征。结果表明，MWNTs 在更长的混合酸处理时间下会产生更多的未配对电子，并且可以通过丙烯酰胺很好地进行功能化。通过 AFM 分析，在 MWNTs 接枝丙烯酰胺后形成了“网状”结构。与其他方法相比，这种新方法具有反应条件温和、操作方便等明显优势。此外，由于其优异的网络结构，MWNTs 的接枝可能在药物输送和再生医学等生物医学应用方面具有巨大的潜力。
