Metaxa Zoi S, Boutsioukou Spyridoula, Amenta Maria, Favvas Evangelos P, Kourkoulis Stavros K, Alexopoulos Nikolaos D
Hephaestus Laboratory, Department of Chemistry, International Hellenic University, St. Luke, 65404 Kavala, Greece.
Research Unit of Advanced Materials, Department of Financial Engineering, School of Engineering, University of the Aegean, 41 Kountouriotou Str., 82132 Chios, Greece.
Nanomaterials (Basel). 2022 Mar 21;12(6):1031. doi: 10.3390/nano12061031.
Multi-wall carbon nanotubes (MWCNTs) exhibit exceptional mechanical and electrical properties and can be used to improve the mechanical and piezoelectric properties of cement-based materials. In the present study, the effect of different MWCNT concentrations as well as different types of surfactants and a superplasticizer were examined to reinforce, at the nanoscale, a white cement mortar typically used for the restoration of monuments of cultural heritage. It was shown that sodium dodecylbenzenesulfonate (SDBS) and Triton X-100 surfactants slightly decreased the white cement mortars' electrical resistivity (by an average of 10%), however, the mechanical properties were essentially decreased by an average of 60%. The most suitable dispersion agent for the MWCNTs proved to be the superplasticizer Ceresit CC198, and its optimal concentration was investigated for different MWCNT concentrations. Carboxylation of the MWCNT surface with nitric acid did not improve the mechanical performance of the white cement nanocomposites. The parametric experimental study showed that the optimum combination of 0.8 wt% of cement superplasticizer and 0.2 wt% of cement MWCNTs resulted in a 60% decrease in the electrical resistivity; additionally, the flexural and compressive strengths were both increased by approximately 25% and 10%, respectively.
多壁碳纳米管（MWCNTs）具有优异的机械和电学性能，可用于改善水泥基材料的机械和压电性能。在本研究中，研究了不同MWCNT浓度以及不同类型的表面活性剂和高效减水剂的影响，以在纳米尺度上增强通常用于修复文化遗产古迹的白色水泥砂浆。结果表明，十二烷基苯磺酸钠（SDBS）和Triton X - 100表面活性剂略微降低了白色水泥砂浆的电阻率（平均降低10%），然而，机械性能平均降低了60%。事实证明，MWCNTs最合适的分散剂是高效减水剂Ceresit CC198，并针对不同的MWCNT浓度研究了其最佳浓度。用硝酸对MWCNT表面进行羧基化处理并没有改善白色水泥纳米复合材料的机械性能。参数化实验研究表明，水泥高效减水剂0.8 wt%和水泥MWCNTs 0.2 wt%的最佳组合使电阻率降低了60%；此外，抗折强度和抗压强度分别提高了约25%和10%。
