Fernandes F M, Araújo R, Proença M F, Silva C J R, Paiva M C
Departamento de Química, Universidade do Minho, 4710-057 Braga, Portugal.
J Nanosci Nanotechnol. 2007 Oct;7(10):3514-8. doi: 10.1166/jnn.2007.818.
This paper reports functionalization of CNF via a Diels-Alder addition reaction and the characterization of the obtained materials. The functionalization was assessed by a calorimetric technique (DSC) and the morphology of CNF modified materials was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The functionalization was observed to be dependent on the preparative conditions. Detailed analysis of the CNF modified material surface using TEM, shows a deposited layer homogeneously distributed over the CNF structures with an average thickness of about 15 nm. Finally the chemical activity of the raw CNF and functionalized CNF was analyzed to determine the pH of the point of zero charge (pHpzc) values. The results obtained showed that the functionalized CNF materials presented enhanced acid activity comparatively with the modified carbonaceous materials reported in literature.
本文报道了通过狄尔斯-阿尔德加成反应对碳纳米纤维（CNF）进行功能化以及对所得材料的表征。通过量热技术（差示扫描量热法，DSC）评估功能化情况，并用扫描电子显微镜（SEM）和透射电子显微镜（TEM）对CNF改性材料的形态进行表征。观察到功能化取决于制备条件。使用TEM对CNF改性材料表面进行详细分析，结果显示在CNF结构上均匀分布着一层沉积层，平均厚度约为15纳米。最后，分析了原始CNF和功能化CNF的化学活性，以确定零电荷点的pH值（pHpzc）。所得结果表明，与文献报道的改性碳质材料相比，功能化CNF材料具有增强的酸性活性。
