Facile growth of carbon nanotubes coated with carbon nanoparticles: A potential low-cost hybrid nanoadditive for improved mechanical, electrical, microstructural and crystalline properties of cement mortar matrix

Sharma, Snigdha; Kothiyal, N.C.

doi:10.1016/j.conbuildmat.2016.07.045

Cited by 22 publications

(10 citation statements)

References 67 publications

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“…Generally, cement hydration products have a strong tendency to form on the surface of CNTs and GNPs due to the large specific surface area accompanied by a high amount of oxygen functional groups, which serve as nucleation sites [15,91]. Although the hydration C 3 S and C 2 S produce C-S-H gel and C-H crystals, any deficiency in the water content surrounding these silicates can slow down the hydration reactions [91]. This is especially true around agglomerates caused by the lower quality of dispersion (Figure 9(a)).…”

Section: Mechanical Microstructuralmentioning

confidence: 99%

An Effective Method for Hybrid CNT/GNP Dispersion and Its Effects on the Mechanical, Microstructural, Thermal, and Electrical Properties of Multifunctional Cementitious Composites

Abedi

Fangueiro

Correia

2020

Journal of Nanomaterials

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This paper reports a study undertaken to achieve a compatible and affordable technique for the high-quality dispersion of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) in an aqueous suspension to be used in multifunctional cementitious composites. In this research work, two noncovalent surfactants with different dispersion mechanisms (Pluronic F-127 (nonionic) and sodium dodecylbenzene sulfonate (SDBS) (ionic)) were used. We evaluated the influences of various factors on the dispersion quality, such as the surfactant concentration, sonication time, and temperature using UV-visible spectroscopy, optical microscopic image analysis, zeta potentials, and particle size measurement. The effect of tributyl phosphate (TBP) used as an antifoam agent was also evaluated. The optimum suspensions of each surfactant were used to produce cementitious composites, and their mechanical, microstructural, electrical, and thermal behaviors were assessed and analyzed. The best dispersed CNT+GNP aqueous suspensions using Pluronic and SDBS were obtained for concentrations of 10% and 5%, respectively, with 3 hours of sonication, at 40°C, with TBP used for both surfactants. The results also demonstrate that cementitious composites reinforced with CNT+GNP/Pluronic showed better mechanical performance and microstructural characteristics due to the higher quality of the dispersion and the increasing hydration rate. Composites prepared with an SDBS suspension demonstrated lower electrical and thermal conductivities compared to those of the Pluronic suspension due to changes in the intrinsic properties of CNTs and GNPs by the SDBS dispersion mechanism.

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Section: Mechanical Microstructuralmentioning

confidence: 99%

An Effective Method for Hybrid CNT/GNP Dispersion and Its Effects on the Mechanical, Microstructural, Thermal, and Electrical Properties of Multifunctional Cementitious Composites

Abedi

Fangueiro

Correia

2020

Journal of Nanomaterials

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“…In their study, Kumar et al [ 43 ] compared the available methods, with their advantages and disadvantages. A more economical alternative for synthetising CNTs was proposed by Sharma et al [ 127 ], which consisted in the use of furnace oil—the cheapest waste from petroleum refineries—as the raw material. They produced CNTs which contained impurities of nano-sized carbon particles and, therefore, the quantity obtained of this nanomaterial was lower than that achieved when using conventional methods.…”

Section: Nanoinclusionsmentioning

confidence: 99%

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

et al. 2016

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Research on cement-based materials is trying to exploit the synergies that nanomaterials can provide. This paper describes the findings reported in the last decade on the improvement of these materials regarding, on the one hand, their mechanical performance and, on the other hand, the new properties they provide. These features are mainly based on the electrical and chemical characteristics of nanomaterials, thus allowing cement-based elements to acquire “smart” functions. In this paper, we provide a quantitative approach to the reinforcements achieved to date. The fundamental concepts of nanoscience are introduced and the need of both sophisticated devices to identify nanostructures and techniques to disperse nanomaterials in the cement paste are also highlighted. Promising results have been obtained, but, in order to turn these advances into commercial products, technical, social and standardisation barriers should be overcome. From the results collected, it can be deduced that nanomaterials are able to reduce the consumption of cement because of their reinforcing effect, as well as to convert cement-based products into electric/thermal sensors or crack repairing materials. The main obstacle to foster the implementation of such applications worldwide is the high cost of their synthesis and dispersion techniques, especially for carbon nanotubes and graphene oxide.

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“…At present, many researchers have added nanometer materials to ordinary concrete and ultra-high performance concrete. The conclusions showed that the mechanical properties and damping properties were improved [11][12][13][14][15]. The Koratkar team [16] combined the CNTs with the polymer and found that the loss modulus was increased by more than 10 times while maintaining the stiffness of the composite.…”

Section: Introductionmentioning

confidence: 99%

The effect of carbon nanotubes on the mechanical and damping properties of macro-defect-free cements

Zhang

et al. 2020

Science and Engineering of Composite Materials

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The effect of CNTs on the mechanical and damping properties of macro-defect-free (MDF) cements was studied, and polyvinyl alcohol (PVA) fibers were also studied as a contrast. It was found that the compressive strength of MDF cements was not significantly affected by the two types of fibers. The CNTs enhanced the flexural strength of MDF, while PVA fibers made negative contribution. The strengthening mechanism of flexural strength of MDF cements by CNTs can be summarized as fiber bridging, crack deflection and fiber slippage. For the damping properties, the proper contents of CNTs and PVA fibers improved the loss factor significantly. The interface transition zone (ITZ) between the PVA fibers and matrix was large, which was favorable for fiber slippage. The damping property of MDF cements with CNTs was mainly due to the slippage between the inner tubes of the CNTs rather than the slippage between the CNTs and matrix.

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Facile growth of carbon nanotubes coated with carbon nanoparticles: A potential low-cost hybrid nanoadditive for improved mechanical, electrical, microstructural and crystalline properties of cement mortar matrix

Cited by 22 publications

References 67 publications

An Effective Method for Hybrid CNT/GNP Dispersion and Its Effects on the Mechanical, Microstructural, Thermal, and Electrical Properties of Multifunctional Cementitious Composites

An Effective Method for Hybrid CNT/GNP Dispersion and Its Effects on the Mechanical, Microstructural, Thermal, and Electrical Properties of Multifunctional Cementitious Composites

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

The effect of carbon nanotubes on the mechanical and damping properties of macro-defect-free cements

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