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高度分散的氧化石墨烯纳米带功能化碳纳米管-氧化石墨烯（GNFG）复合物的合成及其在增强水泥基复合材料力学性能中的应用。

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons-Functionalized Carbon Nanotubes-Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites.

作者信息

Li Peiqi, Liu Junxing, Her Sungwun, Zal Nezhad Erfan, Lim Seungmin, Bae Sungchul

机构信息

Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea.

Department of Biomedical Engineering, University of Texas, San Antonio, TX 78249, USA.

出版信息

Nanomaterials (Basel). 2021 Jun 25;11(7):1669. doi: 10.3390/nano11071669.

DOI:10.3390/nano11071669
PMID:34201941
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8307864/
Abstract

In this study, a graphene oxide nanoribbons-functionalized carbon nanotubes-graphene oxide (GNFG) complex was hydrothermally synthesized as a nanomaterial for reinforcing cementitious composites, using a modified Hummers' method. Three types of components existed in the GNFG: Type I, the functionalized carbon nanotubes-graphene oxide nanoribbons (FCNTs-GNR); and types II and III are graphene oxide (GO) and functionalized carbon nanotubes (FCNTs), respectively, which exist independently. The dispersivity of GNFG and its effects on the mechanical properties, hydration process, and microstructures of cement pastes were evaluated, and the results were compared with those using cement pastes incorporating other typical carbon nanomaterials. The results demonstrated that dispersion of GNFG in aqueous solutions was superior to that of the CNTs, FCNTs, and GO/FCNTs mixture. Furthermore, the highly-dispersed GNFG (0.05 wt.%) improved the mechanical properties of the cement paste after 28 days of hydration and promoted the hydration of cement compared to CNTs, GO, and GO/FCNTs mixture (0.05 wt.%). The results in this study validated the feasibility of using GNFG with enhanced dispersion as a new nano-reinforcing agent for various cementitious systems.

摘要

在本研究中，采用改进的Hummers法水热合成了一种氧化石墨烯纳米带功能化的碳纳米管-氧化石墨烯（GNFG）复合物，作为增强水泥基复合材料的纳米材料。GNFG中存在三种类型的组分：I型，功能化碳纳米管-氧化石墨烯纳米带（FCNTs-GNR）；II型和III型分别为独立存在的氧化石墨烯（GO）和功能化碳纳米管（FCNTs）。评估了GNFG的分散性及其对水泥净浆力学性能、水化过程和微观结构的影响，并将结果与使用掺入其他典型碳纳米材料的水泥净浆的结果进行了比较。结果表明，GNFG在水溶液中的分散性优于碳纳米管、功能化碳纳米管以及GO/FCNTs混合物。此外，与碳纳米管、GO以及GO/FCNTs混合物（0.05 wt.%）相比，高度分散的GNFG（0.05 wt.%）在水化28天后提高了水泥净浆的力学性能，并促进了水泥的水化。本研究结果验证了使用具有增强分散性的GNFG作为各种水泥基体系新型纳米增强剂的可行性。

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