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功能化碳纳米管超声处理对波特兰水泥浆体流变学、水化及抗压强度的影响

Influence of Ultrasonication of Functionalized Carbon Nanotubes on the Rheology, Hydration, and Compressive Strength of Portland Cement Pastes.

作者信息

Silvestro Laura, Ruviaro Artur, Lima Geannina, de Matos Paulo, de Azevedo Afonso R G, Monteiro Sérgio Neves, Gleize Philippe

机构信息

Department of Civil Engineering, Federal University of Santa Catarina (UFSC), Florianópolis 88040-900, Brazil.

Coordenadoria Acadêmica, Federal University of Santa Maria (UFSM), Cachoeira do Sul 96503-205, Brazil.

出版信息

Materials (Basel). 2021 Sep 13;14(18):5248. doi: 10.3390/ma14185248.

DOI:10.3390/ma14185248
PMID:34576471
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8468256/
Abstract

The functionalization process usually increases the localized defects of carbon nanotubes (CNT). Thus, the ultrasonication parameters used for dispersing non-functionalized CNT should be carefully evaluated to verify if they are adequate in dispersing functionalized CNT. Although ultrasonication is widely used for non-functionalized CNT, the effect of this dispersing process of functionalized CNT has not been thoroughly investigated. Thus, this work investigated the effect of ultrasonication on functionalized CNT + superplasticizer (SP) aqueous dispersions by ultraviolet-visible (UV-Vis) spectroscopy, dynamic light scattering (DLS), and Fourier transform infrared spectroscopy (FTIR). Furthermore, Portland cement pastes with additions of 0.05% and 0.1% CNT by cement weight and ultrasonication amplitudes of 0%, 50% and 80% were evaluated through rheometry, isothermal calorimetry, compressive strength at 1, 7 and 28 days, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). FTIR results from CNT + SP dispersions indicated that ultrasonication may negatively affect SP molecules and CNT graphene structure. The increase in CNT content and amplitude of ultrasonication gradually increased the static and dynamic yield stress of paste but did not significantly affect its hydration kinetics. Compressive strength results indicated that the optimum CNT content was 0.05% by cement weight, which increased the strength of composite by up to 15.8% compared with the plain paste. CNT ultrasonication neither increases the degree of hydration of cement nor the mechanical performance of composite when compared with mixes containing unsonicated CNT. Overall, ultrasonication of functionalized CNT is not efficient in improving the fresh and hardened performance of cementitious composites.

摘要

功能化过程通常会增加碳纳米管（CNT）的局部缺陷。因此，用于分散未功能化碳纳米管的超声处理参数应仔细评估，以验证其是否足以分散功能化碳纳米管。尽管超声处理广泛用于未功能化碳纳米管，但功能化碳纳米管的这种分散过程的效果尚未得到充分研究。因此，本研究通过紫外可见光谱（UV-Vis）、动态光散射（DLS）和傅里叶变换红外光谱（FTIR）研究了超声处理对功能化碳纳米管+高效减水剂（SP）水分散体的影响。此外，通过流变学、等温量热法、1、7和28天的抗压强度、X射线衍射（XRD）和热重分析（TGA），对水泥重量分别为0.05%和0.1%的碳纳米管以及超声振幅分别为0%、50%和80%的波特兰水泥净浆进行了评估。碳纳米管+高效减水剂分散体的FTIR结果表明，超声处理可能会对高效减水剂分子和碳纳米管的石墨烯结构产生负面影响。碳纳米管含量的增加和超声振幅的增大逐渐提高了净浆的静态和动态屈服应力，但对其水化动力学没有显著影响。抗压强度结果表明，碳纳米管的最佳水泥重量含量为0.05%，与纯水泥净浆相比，复合材料的强度提高了15.8%。与含有未超声处理碳纳米管的混合料相比，碳纳米管的超声处理既没有提高水泥的水化程度，也没有提高复合材料的力学性能。总体而言，功能化碳纳米管的超声处理在改善水泥基复合材料的新拌性能和硬化性能方面效率不高。

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