CNTs@SiO<sub>2</sub>核壳结构纳米线对水泥力学性能及微观结构的影响

doi:10.11896/cldb.22010225

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Abstract Carbon nanotubes could be widely used to enhance the flexural toughness of cement-based materials due to the excellent mechanical properties. However, the weak interfacial adhesion between carbon nanotubes and cement-based materials is an urgent problem need to be solved. In this research, the surface of multi-walled carbon nanotubes was modified by self-assembly method, and the core-shell structure nanowires (CNTs@SiO₂) of silicon dioxide coated carbon nanotubes were synthesized. The original carbon nanotubes (O-CNTs), purified carbon nanotubes (P-CNTs) and CNTs@SiO₂ were incorporated into cement to investigate the influence of carbon nanotubes on the mechanical properties of cement-based materials. Hydration heat, X-ray diffraction analysis (XRD), thermal analysis (TG-DTG), scanning electron microscopy analysis (SEM) and other test methods were applied to explore the mechanism of their effect on the mechanical properties of cement-based materials. Compared with O-CNTs and P-CNTs, the incorporation of CNTs@SiO₂ can significantly improve the early mechanical properties of cement, and with the increase of content of CNTs@SiO₂, the flexural strength shows a tendency to increase first and then decrease; when the content of CNTs@SiO₂ is 0.08% (mass fraction, the same below), the effect of improving the flexure strength of cement is the best, and the 3 d flexural strength can be increased by up to 18.8%. The reason is that the incorporation of CNTS@SiO₂ promoted the hydration rate of cement, the nano-silica on the surface of CNTs@SiO₂ could react with the calcium hydroxide in the hardened cement to form a second hydration product, which enhanced the interfacial adhesion. Therefore, the mechanical properties of cement are improved. The research provides a new idea for the modification of carbon nanotubes on the cement-based materials.

Key words： multi-walled carbon nanotubes silica surface coating modification mechanical property microstructure

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TQ172.1

Fund:National Natural Science Foundation of China (51908198),Henan Outstanding Foreign Scientists' Workroom (GZS2021003),and Key Public Welfare Special Project of Henan Province (201300311000).

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	ZHU Jianping
	ZHANG Sujuan
	GAO Fei
	ZHANG Wenyan

Cite this article:

ZHU Jianping,ZHANG Sujuan,GAO Fei, et al. Effect of CNTs@SiO₂ Core-Shell Nanowires on the Mechanical Properties and Microscopic Structure of Cement[J]. Materials Reports, 2023, 37(16): 22010225-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22010225 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22010225

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