The role of functional groups on graphene oxide in epoxy nanocomposites

Li, Zheng; Young, Robert J.; Wang, Rongguo; Yang, Fan; Hao, Lifeng; Jiao, Weicheng; Liu, Wenbo

doi:10.1016/j.polymer.2013.08.026

Cited by 167 publications

(101 citation statements)

References 41 publications

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“…This is in accordance with the results from the mechanical testing, as these samples exhibited higher modulus values than the PP-GNP ones. Furthermore, the slight decrease of the shift rate with increasing the filler content, that has been observed in the literature [43,44], is most probably due to aggregation of the GNPs. The slopes of the lines in Figure 7 and listed in Table 2, are -5 cm -1 /% for the GNP-filled materials and -6 cm -1 /% for the hybrid and enable the effective Young's modulus of the GNPs to be determined.…”

Section: Stress-induced Raman Band Shiftssupporting

confidence: 51%

Hybrid multifunctional graphene/glass-fibre polypropylene composites

Papageorgiou

Kinloch

Young

2016

Composites Science and Technology

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103

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The effect of the simultaneous addition, using a melt-mixing procedure, of glass fibres (GFs) and graphene in the form of graphene nanoplatelets (GNPs) upon the properties of polypropylene (PP) has been studied in detail. Composite samples containing GFs and GNPs alone were also prepared for comparative purposes. The crystalline microstructure of the composites was characterised by X-ray diffraction (XRD), while scanning electron microscopy (SEM) was used to study the interface between the matrix and the fillers. The orientation of the glass fibres was evaluated using SEM while polarized Raman spectroscopy was utilized to determinate the orientation of the GNPs in the composite samples. The mechanical properties of the composites were evaluated by tensile testing and it was found that the Young's modulus of the hybrid material is higher than that of the materials containing the fillers individually, showing an additive effect. Raman spectroscopy employed simultaneously with deformation of the composites was used to show that there was good interfacial stress transfer between the PP matrix and the GNPs. Finally, the thermal conductivity of the materials was measured and found to be significantly higher for the composites containing GNPs alone.

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Section: Stress-induced Raman Band Shiftssupporting

confidence: 51%

Hybrid multifunctional graphene/glass-fibre polypropylene composites

Papageorgiou

Kinloch

Young

2016

Composites Science and Technology

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103

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“…The overloading of RGO (RGO-0.5) produced poor flexural properties, resulting from the aggregation of RGO in the epoxy matrix. Excessive interfacial contacts, between both the RGO/RGO and RGO/matrix, weaken the flexural properties of RGO/epoxy nanocomposites [24]. From the results, we found that the appropriate amount of RGO led to a superior reinforcement effect in the matrix.…”

Section: Discussionmentioning

confidence: 83%

Effect of chemically reduced graphene oxide on epoxy nanocomposites for flexural behaviors

Lee¹,

Chong²,

Kim³

et al. 2014

Carbon letters

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In this work, nanocomposites of epoxy resin and chemically reduced graphene oxide (RGO) were prepared by thermal curing process. X-ray diffractions confirmed the microstructural properties of RGO. Differential scanning calorimetry was used to evaluate the curing behaviors of RGO/epoxy nanocomposites with different RGO loading amounts. We investigated the effect of RGO loading amounts on the mechanical properties of the epoxy nanocomposites. It was found that the presence of RGO improved both flexural strength and modulus of the epoxy nanocomposites till the RGO loading reached 0.4 wt%, and then decreased. The optimum loading achieved about 24.5 and 25.7% improvements, respectively, compared to the neat-epoxy composites. The observed mechanical reinforcement might be an enhancement of mechanical interlocking between the epoxy matrix and RGO due to the unique planar structures.

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“…Recently, graphene oxide (GO) was demonstrated to be a candidate carbon-based adsorbent due to having of non-specific functional groups (carbonyl, hydroxyl and epoxide) on its surface, providing anchor sites for both dye and metal ion complexation [41][42][43][44] .The abundance of functional groups on its surface gives GO adsorption capability for dyes such as methylene blue,congo red,sulfamethoxazole, ciprofloxacin,acridine orange,methyl orange,methyl violet, rhodamine B and orange G [45][46][47][48][49][50][51] .However, the removal of malachite green from aqueous solutionby using graphene oxide has not yet been reported inthe literature.…”

mentioning

confidence: 99%

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

Nuengmatcha¹,

Mahachai²,

Chanthai³

2014

Orient J Chem

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Graphene oxide (GO) was produced from bare graphite (BGP) material and was used as an intrinsic adsorbent for the removal of malachite green (MG) from aqueous solution. In an optimization study, the effects of the initial concentration of MG, solution pH, adsorbent dosage, contact time and ionic strength were investigated in detail. The water-soluble dye was analyzed at a maximum wavelength of 618 nm. The optimum conditions for MG removal from aqueous solution included a 300 mg/L initial concentration with 0.02 mg adsorbent at pH 5.1, and complete adsorption equilibrium was reached within 40 min. The maximum adsorption capacity of GO for MG was 384.62 mg/g, dramatically higher (over 10 times) than that of BGP (28.73 mg/g).The adsorption process followed pseudo-second-order kinetics. Thermodynamic data demonstrated that dye adsorption onto the GO surface was mainly an exothermic spontaneous reaction. The remarkably different adsorption isotherms for GO and BGP fit well with the Langmuir and Freundlich models, respectively. It is therefore evident that the prepared GO can be used as a highly effective adsorbent for this toxic dye.

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The role of functional groups on graphene oxide in epoxy nanocomposites

Cited by 167 publications

References 41 publications

Hybrid multifunctional graphene/glass-fibre polypropylene composites

Hybrid multifunctional graphene/glass-fibre polypropylene composites

Effect of chemically reduced graphene oxide on epoxy nanocomposites for flexural behaviors

Thermodynamic and kinetic study of the intrinsic adsorption capacity of graphene oxide for malachite green removal from aqueous solution

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