Influence of ultrasonication on the dispersion and enhancing effect of graphene oxide–carbon nanotube hybrid nanoreinforcement in cementitious composite

Gao, Yuan; Jing, Hong Wen; Chen, Shujian; Du, Mingrui; Chen, Weiqiang; Duan, Wenhui

doi:10.1016/j.compositesb.2018.11.066

Cited by 141 publications

(30 citation statements)

References 53 publications

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“…To make full use of their enhancing potential, carbon nanomaterials are always introduced into cement using the following steps: (i) fabricating aqueous suspensions of carbon nanomaterials; and then (ii) mixing these prepared liquid mixtures with cement (as shown in Table 2). High-shear mixing is helpful in separating CNFs/CNTs [83], ultrasonication has proved to be more ef- [86] fective, and thus has become more commonly used [24,25]. The ultrasonication process produces rapidly collapsing cavitation bubbles in the liquid, creating high local solvent velocities that act as separating forces to overcome the attraction between nanoparticles [84,85].…”

Section: Carbon Nanomaterials Enhanced Cement-based Materials 31 Fabmentioning

confidence: 99%

“…The ultrasonication process should be well designed, since insufficient ultrasonication energy (UE) is not effective for the uniform dispersion of nanoparticles ( Figure 2a) [72] and excess UE tailors the nanomaterials into smaller fragments. Figure 3 presents the size distribution intensity of GO/CNT hybrid particles in water ultrasonicated for different time and at different power levels [86]. It can be seen that the particle size distribution shifts towards a smaller size with increasing ultrasonication time or power.…”

Section: Carbon Nanomaterials Enhanced Cement-based Materials 31 Fabmentioning

confidence: 99%

“…In another study [109], the co-effects of CNFs and GO on the mechanical properties of cement were investigated, and the results showed that the addition of 1.0 wt.% CNFs increased the compressive and flexural strengths of cement by 20.8% and 18.6%, respectively, while replacing half of the CNFs with GO gave increases in the compressive and flexural strengths of about 31.6% and 39.8%, respectively. This is thought to be at least partially because that GO worked as an extra surfactant to improve the dispersion of CNTs in the matrices [86].…”

Section: Improvement In Mechanical Properties and Relevant Mechanismsmentioning

confidence: 99%

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Carbon nanomaterials enhanced cement-based composites: advances and challenges

Jing

Gao

et al. 2020

Nanotechnology Reviews

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AbstractCarbon nanomaterials, predominantly carbon nanofibers, carbon nanotubes, graphene, graphene nanoplates, graphene oxide and reduced graphene oxide, possess superior chemical, physical and mechanical properties. They have been successfully introduced into ordinary Portland cement to give enhancements in terms of mechanical properties, durability and electrical/thermal conductivity, and to modify the functional properties, converting conventional cement-based materials into stronger, smarter and more durable composites. This paper provides a comprehensive review of the properties of carbon nanomaterials, current developments and novel techniques in carbon nanomaterials enhanced cement-based composites (CN-CBCs). Further study of the applications of CN-CBCs at industrial scale is also discussed.

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Section: Carbon Nanomaterials Enhanced Cement-based Materials 31 Fabmentioning

confidence: 99%

Section: Carbon Nanomaterials Enhanced Cement-based Materials 31 Fabmentioning

confidence: 99%

Section: Improvement In Mechanical Properties and Relevant Mechanismsmentioning

confidence: 99%

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Carbon nanomaterials enhanced cement-based composites: advances and challenges

Jing

Gao

et al. 2020

Nanotechnology Reviews

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“…Table A1 shows that ultrasonication did not significantly change the L* , a* or b* values of PVA/CMC, PVA/CMC/ZnO NPs and PVA/CMC/ x GnP films ( p > 0.05), but significantly affected the L* value of some PVA/CMC/ZnO NPs/ x GnP films. This behavior was explained by the beneficial effects of heating and cavitation, generated by ultrasonic treatment, on the dispersion of x GnP in water at low x GnP content and high ZnO NPs content [ 56 ]. Thus, under these conditions, x GnP was uniformly distributed in the composite film (because of their high content, ZnO NPs easily agglomerated in the PVA/CMC matrix) to result in a dark color.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ultrasonication Time on the Properties of Polyvinyl Alcohol/Sodium Carboxymethyl Cellulose/Nano-ZnO/Multilayer Graphene Nanoplatelet Composite Films

Zhang

Dong

et al. 2020

Nanomaterials

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Ultrasonication-assisted solution casting was used to prepare polyvinyl alcohol (PVA)/sodium carboxymethyl cellulose (CMC)/nano-ZnO/multilayer graphene nanoplatelet (xGnP) composite films; the performances (mechanical properties, water vapor permeability (WVP), biodegradability and antibacterial activity) of these films were investigated as a function of the ZnO NPs:xGnP mass ratio and ultrasonication time. Intermolecular interactions among ZnO NPs, xGnP and the PVA/CMC matrix were shown to improve WVP, while X-ray diffraction and scanning electron microscopy analyses revealed that the internal reticular structure of ultrasound-treated PVA/CMC/ZnO NPs/xGnP composite films was in a fluffier state than that of the untreated composite films and the PVA/CMC film. The incorporation of ZnO NPs and xGnP into the composite film reduced its tensile strength and elongation at break, and increased antibacterial activity and biodegradability. In addition, we carried out the experiment of strawberry preservation and measured weight loss ratio, firmness, content of total soluble solids and titration acid. Finally, the composite film of 7:3 had the best preservation effect on strawberries. Thus, the obtained results paved the way to develop novel biodegradable composite films with antimicrobial activity for a wide range of applications.

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“…Li et al also argued that GO agglomerates, after direct incorporation of GO into the cement matrix, were more electrically insulative than cement paste, and the resultant composite had no piezoresisitive effect [46]. A few scholars endeavored to achieve sufficient dispersion and stabilizing of GO in cement matrix employing ultrasonication [47], polycarboxylate superplasticizer [37,48], and/or silica fume aiding [48]. Here, we use the dispersion techniques of ultrasonication and polycarboxylate superplasticizer pre-stabilization to achieve sufficient dispersion of GO.…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphene Oxide on the Mechanical Properties, Fracture Toughness, and Microhardness of Recycled Concrete

Luo

Chen

et al. 2019

Nanomaterials

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There is a constant drive to improve the properties of recycled concrete owing to its inferior strength and fracture toughness compared to normal concrete and recent progress in graphene oxide (GO) nanomaterials impelling nanosized reinforcements to recycled concrete. Here, GO-modified natural sand (NS)- or recycled sand (RS)-based mortars (GONMs or GORMs) with six GO fractions (wGOs) were fabricated to explore their 28 d mechanical strengths (f28t, f28c), fracture toughness (KIC, δc), and microhardness (Hv), as well as their crystal phases (using X-ray powder diffraction) and microstructures (using scanning electronic microscopy). Results reveal, greater enhancements in mechanical strengths (4.50% and 10.61% in f28t, 4.76% and 13.87% in f28c), fracture toughness (16.49% and 38.17% in KIC, 160.14% and 286.59% in δc), and microhardness (21.02% and 52.70% in Hv) of GORM with just 0.025 wt‰ and 0.05 wt‰ GO, respectively, with respect to the control are achieved when comparing with those of GONM with the same wGO. More zigzag surfaces, more irregular weak interface slips, and the relatively lower strengths of RS bring the superiority of the template and reshaping effects of GO into full play in GORM rather than in GONM. These outcomes benefit a wide range of applications of recycled concrete products.

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Influence of ultrasonication on the dispersion and enhancing effect of graphene oxide–carbon nanotube hybrid nanoreinforcement in cementitious composite

Cited by 141 publications

References 53 publications

Carbon nanomaterials enhanced cement-based composites: advances and challenges

Carbon nanomaterials enhanced cement-based composites: advances and challenges

Effects of Ultrasonication Time on the Properties of Polyvinyl Alcohol/Sodium Carboxymethyl Cellulose/Nano-ZnO/Multilayer Graphene Nanoplatelet Composite Films

Influence of Graphene Oxide on the Mechanical Properties, Fracture Toughness, and Microhardness of Recycled Concrete

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