Nano-cement composite with graphene oxide produced from epigenetic graphite deposit

Qureshi, Tanvir; Panesar, Daman K.; Boopathi, S.; Chen, Aicheng; Wood, Peter C.

doi:10.1016/j.compositesb.2018.09.095

Cited by 80 publications

(28 citation statements)

References 32 publications

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“…The PBS buffer was a mixture of pure water, Na 2 HPO 4 and NaH 2 PO 4 , and NaOH was employed to adjust its pH to 7.2. GO was synthesized from high-purity graphite provided by ZEN Graphene Solutions Ltd., Thunder Bay, Canada, using a modified Hummers method [28]. GO was treated at 200 • C for 15 min in an oil bath to prepare thermally-reduced graphene oxide (TrGO).…”

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confidence: 99%

Graphene-Oxide-Based Electrochemical Sensors for the Sensitive Detection of Pharmaceutical Drug Naproxen

Qian

Thiruppathi

Elmahdy

et al. 2020

Sensors

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Here we report on a selective and sensitive graphene-oxide-based electrochemical sensor for the detection of naproxen. The effects of doping and oxygen content of various graphene oxide (GO)-based nanomaterials on their respective electrochemical behaviors were investigated and rationalized. The synthesized GO and GO-based nanomaterials were characterized using a field-emission scanning electron microscope, while the associated amounts of the dopant heteroatoms and oxygen were quantified using x-ray photoelectron spectroscopy. The electrochemical behaviors of the GO, fluorine-doped graphene oxide (F-GO), boron-doped partially reduced graphene oxide (B-rGO), nitrogen-doped partially reduced graphene oxide (N-rGO), and thermally reduced graphene oxide (TrGO) were studied and compared via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). It was found that GO exhibited the highest signal for the electrochemical detection of naproxen when compared with the other GO-based nanomaterials explored in the present study. This was primarily due to the presence of the additional oxygen content in the GO, which facilitated the catalytic oxidation of naproxen. The GO-based electrochemical sensor exhibited a wide linear range (10 µM–1 mM), a high sensitivity (0.60 µAµM−1cm−2), high selectivity and a strong anti-interference capacity over potential interfering species that may exist in a biological system for the detection of naproxen. In addition, the proposed GO-based electrochemical sensor was tested using actual pharmaceutical naproxen tablets without pretreatments, further demonstrating excellent sensitivity and selectivity. Moreover, this study provided insights into the participatory catalytic roles of the oxygen functional groups of the GO-based nanomaterials toward the electrochemical oxidation and sensing of naproxen.

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confidence: 99%

Graphene-Oxide-Based Electrochemical Sensors for the Sensitive Detection of Pharmaceutical Drug Naproxen

Qian

Thiruppathi

Elmahdy

et al. 2020

Sensors

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“…As revealed by previous studies, the addition of 0.01-0.05 wt.% of graphene oxide enhances the microstructure of hardened cement paste reducing its porosity [16][17][18], promotes the cement hydration, in particular the early-age hydration [16, 19 ,20] and increases the compressive and tensile strength of cementitious composites up to 48% and 79%, respectively [15,[17][18][19][20][21]. Authors [17,22] attributed the strengthening mechanism of graphene oxide to the reaction between -OH, -COOH and -SO 3 H functional groups attached to the GO nanosheets being the nucleation sites and C 3 S, C 2 S, C 3 A compounds existing in cement, as a result of which the additional growth points for cement hydrates are created and micropores can be significantly filled. Additionally, according to Wang et al [23] and Zhao et al [24], the enhanced mechanical properties of cement composites modified with graphene oxide originate from the reaction between Ca 2+ ions present in cement and -COOH groups from GO sheets.…”

Section: Introductionmentioning

confidence: 94%

Mechanical Properties of Cement Mortar With Graphene Oxide

Krystek

2019

Architecture, Civil Engineering, Environment

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These days, nanotechnology has already influenced many fields of science and technology, including civil engineering. Cementitious composites incorporating various nanomaterials have emerged as novel materials with improved microstructure, mechanical properties and durability. Over the past decades, graphene oxide has appeared as one of the most promising nanomaterials for civil engineering applications. However, the effect of graphene oxide addition on the properties of cementitious composites has not yet been fully investigated. The paper presents the studies on the mechanical properties of cement mortar reinforced with the 0.03 wt.% of graphene oxide (dosage by weight of cement). Graphene oxide proved to accelerate the cement hydration, in particular at the early stages of mortar hardening, hence improving the mortar performance during mechanical tests. The significant enhancement of the flexural, cubic and cylindrical compressive strength has been reported, thus showing the great nanotechnology potential for concrete structures.

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“…The most commonly used nanomaterials for cement composites are nano-silicas [3], carbon nano tubes [4] and nano-TiO2 [5]. As a carbon-based nanomaterial, graphene oxide (GO) consists of several layers of wrinkled two-dimensional carbon sheet with various oxygen-containing functional groups, which is highly dispersible in water and possesses excellent mechanical properties [6,7]. Existing studies have confirmed that GO can regulate the hydration products of cement and significantly improve the mechanical properties of cement composites [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Xu [13] and Hou [14] examined the role of GO in cement composites by using experiments and a molecular dynamics (MD) simulation. The reinforcing mechanisms of GO on cement composites can be attributed to the promoted cement hydration, the refined pore structure, the compacted microstructure [15], which opened a new prospect to modify cement composites at the micro-molecular level [7].…”

Section: Introductionmentioning

confidence: 99%

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

Xu¹

2020

Ceramics - Silikaty

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Graphene oxide (GO) has attracted increasing attention for its application in cementitious materials as it can be used to regulate the hydration products of cement and improve the properties of cement composites. This paper investigated the role of GO on the hydration process and chemical shrinkage of a cement paste through an experimental study and molecular dynamics simulation. The hydration heat flow of a cement composite with GO (CCG) was characterised by using an isothermal calorimeter. The chemical shrinkage of the CCG was also measured by applying a modified method based on ASTM C1608. The test results have shown that incorporating GO can mainly accelerate the hydration rate of cement composites at the early stage, but would not change the four-stage process of the cement hydration. The addition of GO by 0.3 wt% of cement is able to reduce the chemical shrinkage of the cement composites. This regulation effect is mainly attributed to the hydrogen bonding, which has been verified by the molecular dynamics simulation.

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Nano-cement composite with graphene oxide produced from epigenetic graphite deposit

Cited by 80 publications

References 32 publications

Graphene-Oxide-Based Electrochemical Sensors for the Sensitive Detection of Pharmaceutical Drug Naproxen

Graphene-Oxide-Based Electrochemical Sensors for the Sensitive Detection of Pharmaceutical Drug Naproxen

Mechanical Properties of Cement Mortar With Graphene Oxide

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

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