Adsorption characteristics of graphene oxide nanosheets on cement

Wang, Min; Wang, Rumin; Yao, Hao; Wang, Zhujun; Zheng, Shao-Fei

doi:10.1039/c6ra10902k

Cited by 48 publications

(33 citation statements)

References 31 publications

(25 reference statements)

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“…At the same time, the cloudy GO flocculation settled down with the increasing CH dosage. The results were in good agreement with the conclusions obtained in other researches (5,19,20).…”

Section: Flocculation Of Go In Ch Solutionsupporting

confidence: 92%

Incorporating graphene oxide into lime solution: A study of flocculation and corresponding improvement

Jing

et al. 2018

Mater. construcc.

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The dispersion behavior of graphene oxide in cement matrix is one important factor in enhancing cement performance. In this work, we investigated the dispersion of graphene oxide in cement by simulating alkaline environment with a solution of calcium hydroxide and studied the corresponding strategy of improving dispersion. The obtained results showed that graphene oxide would flocculate even if calcium hydroxide concentration was very low, which might be the main reason of the unstable properties of the graphene oxide-doped cement. In addition, we discovered that, compared to -OH group, the -COOH group and the long chain of polycarboxylate-based superplasticizer were more effective in delaying the flocculation of graphene oxide. Finally, we proposed a dispersion mechanism of polycarboxylate-based superplasticizer. The study provides inspiration for the design of graphene oxide-doped cement materials.

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“…At the same time, the cloudy GO flocculation settled down with the increasing CH dosage. The results were in good agreement with the conclusions obtained in other researches (5,19,20).…”

Section: Flocculation Of Go In Ch Solutionsupporting

confidence: 92%

Incorporating graphene oxide into lime solution: A study of flocculation and corresponding improvement

Jing

et al. 2018

Mater. construcc.

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“…Previous reports suggested that GO adsorbs onto the surface of PC particles while mixing the paste [33], as also discussed in the introduction. However, based on the results shown in Sections 3.1-3.3, if GO interacts with the surface of hydrating particles, one should clearly expect a delay in hydration.…”

Section: Dominant Role Of Go In Pc Pastementioning

confidence: 76%

“…GO layers become even more negatively charged in alkaline solutions, as more carboxyl sites are deprotonated [32]. Wang et al [33] suggested that carboxylated GO adsorbs onto the surface of PC particles in the paste. This mechanism is plausible because PC grains are known to possess a positive electrostatic charge in water [34], so in principle, GO layers could be attracted to PC surfaces.…”

Section: Introductionmentioning

confidence: 99%

Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh

Duffour

Skipper

et al. 2018

Cement and Concrete Research

125

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This study reports on the effect of graphene oxide (GO) on the hydration of Portland cement (PC) and industrial clinker. GO accelerates PC hydration, whereas it temporarily retards that of clinker. This difference reflects a twofold behaviour of GO in cement pastes. Retardation is due to the interaction of GO with the surface of hydrating grains, while acceleration results from a seeding effect. Gypsum causes this difference. GO is shown to have little effect on the strength of hardened pastes, and this merely relates to the change of hydration degree, as opposed to reinforcing effect formerly assumed. Overall, GO is not particularly active as a nucleation surface, as it aggregates and behaves in a similar way to inert fillers (e.g. quartz). Polycarboxylate-ether copolymer could make GO an active seed in cement pastes, as it prevents GO from aggregating. Nevertheless, this was found to occur only in alite pastes but not PC pastes.

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“…The formed aggregation in this way can reach the micron scale and thus should not be neglected. 45 Silica fume is then adopted to mechanically and chemically separate GO nanosheets from calcium ions by means of reacting with Ca(OH) 2 . Meanwhile, calcium silicate hydrate, the main product of cementitious materials, has silicate hydroxyl and calcium hydroxyl groups near the surface, which will form stable H-bonds connection with GO.…”

Section: Dispersion Of Gnp and Go In Cementitious Materialsmentioning

confidence: 99%

Graphene-engineered cementitious composites

Zheng

Han

Cui

et al. 2017

Nanomaterials and Nanotechnology

115

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Graphene, a two-dimensional monoatomic thick building block of a carbon allotrope, has emerged as nano-inclusions in cementitious materials due to its distinguished mechanical, electrical, thermal, and transport properties. Graphene nanoplatelet and its oxidized derivative graphene oxide were found to be able to reinforce and modify the cementitious materials from atomic scale to macroscale, and thereby endow them with excellent mechanical properties, durability, and multifunctionality. This article reviews the progress of fabrication, properties, mechanisms, and applications of graphenebased cementitious composites.

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Adsorption characteristics of graphene oxide nanosheets on cement

Cited by 48 publications

References 31 publications

Incorporating graphene oxide into lime solution: A study of flocculation and corresponding improvement

Incorporating graphene oxide into lime solution: A study of flocculation and corresponding improvement

Understanding the behaviour of graphene oxide in Portland cement paste

Graphene-engineered cementitious composites

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