Wang Baomin, Fan Chengcheng
State Key Laboratory of Coastal and Offshore Engineering, School of Civil Engineering, Dalian University of Technology, Dalian 116024, China.
J Nanosci Nanotechnol. 2020 Jan 1;20(1):113-120. doi: 10.1166/jnn.2020.16887.
Carbon nanofibers (CNFs) could not be distributed evenly in cement composites due to their high specific surface area and van der Waals force, and the poor dispersion of CNFs significantly influenced the performance of cement composites. Therefore, uniform dispersion of CNFs plays a significant role in the properties of cement composites. This study mainly investigated the cement composite samples with CNFs treated respectively by methyl cellulose (MC), sodium dodecyl sulfate (SDS) and MC+SDS. The UV-vis spectroscopy and optical microscopy results showed that the dispersion of CNFs in the MC+SDS solution was much better than that in MC and SDS solution. MC, SDS and MC+SDS solution improved the mechanical properties of CNFs reinforced cement composites, but the MC+SDS solution exhibited the greatest effect. Furthermore, the microstructure and morphology analysis indicated that uniform dispersed CNFs could accelerate the hydration process and phase formation, and improved the compactness and interfacial connection, so as to enhance the mechanical properties and microstructure of cement composites.
由于碳纳米纤维（CNFs）具有高比表面积和范德华力，其在水泥基复合材料中难以均匀分布，而CNFs的分散性差显著影响了水泥基复合材料的性能。因此，CNFs的均匀分散对水泥基复合材料的性能起着重要作用。本研究主要考察了分别用甲基纤维素（MC）、十二烷基硫酸钠（SDS）以及MC+SDS处理的含CNFs的水泥基复合材料样品。紫外可见光谱和光学显微镜结果表明，CNFs在MC+SDS溶液中的分散性远优于在MC和SDS溶液中的分散性。MC、SDS以及MC+SDS溶液均改善了CNFs增强水泥基复合材料的力学性能，但MC+SDS溶液的效果最为显著。此外，微观结构和形态分析表明，均匀分散的CNFs能够加速水化过程和相形成，并改善密实度和界面连接，从而增强水泥基复合材料的力学性能和微观结构。
