Nanoscale friction of graphene oxide over glass-fibre and polystyrene

Tripathi, Manoj; Mahmood, Haroon; Novel, David; Iacob, Erica; Vanzetti, L.; Bartali, Ruben; Speranza, G.; Pegoretti, Alessandro; Pugno, Nicola

doi:10.1016/j.compositesb.2018.04.001

Cited by 21 publications

(14 citation statements)

References 55 publications

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“…The same conclusions cannot be drawn considering the intensity of the TE process, since the difference of the rGO amount deposited passing from NEF to 2T is too small to be detected by SEM analysis. Further quantitative investigations, for example by using friction force microscopy (FFM) [27,44], could give more information on the effective quantity of the nanomaterial deposited upon the electrification. It can be, however, deduced that a physical interaction between GO nanosheets with charged GF takes place due to the creation of attractive surface charges on the latter.…”

Section: Resultsmentioning

confidence: 99%

Graphene Deposition on Glass Fibers by Triboelectrification

et al. 2021

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In this work, a novel nanomaterial deposition technique involving the triboelectrification (TE) of glass fibers (GF) to create attractive charges on their surface was investigated. Through TE, continuous GF were positively charged thus, attracting negatively charged graphene oxide (GO) nanoparticles dispersed in a solution. The electrical charges on the glass fibers surface increased with the intensity of the TE process. The deposited GO coating was then chemically treated to obtain reduced graphene oxide (rGO) on the surface of GFs. The amount of coating obtained increased with the GO solution concentration used during the deposition process, as revealed by FESEM analysis. However, the same increment could not be noticed as a function of the intensity of the process. Both uncoated and coated GF were used to obtain single fiber microcomposites by using a bicomponent epoxy matrix. The fiber/matrix interfacial shear strength was evaluated through micro debonding tests, which revealed an increment of fiber/matrix adhesion up to 45% for rGO coated GF in comparison to the uncoated ones. A slight improvement in the electrical conductivity of rGO coated fibers through TE compared to conventional dip coating was also observed in terms of volumetric resistivity by a four-point probe setup.

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Section: Resultsmentioning

confidence: 99%

Graphene Deposition on Glass Fibers by Triboelectrification

et al. 2021

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“…Indeed, both SiC nanoparticles and GO flakes were intercalated into the pores of giant reed, which were opened through chemical treatment and then closed by thermo-compression (Figure 1, Figure 2a). It can be interpreted in terms of better interfacial adhesion or increased in the chemical cross-linking at the interface driven by the additional hydrogen bonds available from the GO structure [48,49] and the nonstoichiometric oxides shell (Figure 2i) on SiC nanostructures [50,51]. Not to mention that the small amount of Ca impurities, which was found in all the samples (see Figure S1), was reported to have a beneficial effect on the chemical cross-linking between GO and cellulose [52], thus effectively enhancing the stiffness and the strength between GO layers [53].…”

Section: Resultsmentioning

confidence: 99%

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

et al. 2020

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Recently, several chemical and physical treatments were developed to improve different properties of wood. Such treatments are applicable to many types of cellulose-based materials. Densification leads the group in terms of mechanical results and comprises a chemical treatment followed by a thermo-compression stage. First, chemicals selectively etch the matrix of lignin and hemicellulose. Then, thermo-compression increases the packing density of cellulose microfibrils boosting mechanical performance. In this paper, in comparison with the state-of-the-art for wood treatments we introduce an additional nano-reinforcemeent on densified giant reed to further improve the mechanical performance. The modified nanocomposite materials are stiffer, stronger, tougher and show higher fire resistance. After the addition of nanoparticles, no relevant structural modification is induced as they are located in the gaps between cellulose microfibrils. Their peculiar positioning could increase the interfacial adhesion energy and improve the stress transfer between cellulose microfibrils. The presented process stands as a viable solution to introduce nanoparticles as new functionalities into cellulose-based natural materials.

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“…We observed an increment of Young’s modulus and tensile strength for the hybrid fillers in the composite as compared to neat PS and PS-GO laminate. Under tensile loading, the higher shear strength between PS-GO/C-SWNT, interlayer bridging of GO sheets through C-SWNT are responsible for enhanced energy dissipation loading and resulted in higher toughness modulus [ 68 , 69 , 70 ] than the GO-PS system. Nevertheless, the toughness modulus of the PS is the highest among the PS-GO and PS- GO/C-SWNT due to the lower capability of the carbon materials (graphene and carbon nanotubes) to absorb energy and accommodate large deformation [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Free-Standing Graphene Oxide and Carbon Nanotube Hybrid Papers with Enhanced Electrical and Mechanical Performance and Their Synergy in Polymer Laminates

Valentini

Rong

Bon

et al. 2020

IJMS

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Hybrid nanomaterials fabricated by the heterogeneous integration of 1D (carbon nanotubes) and 2D (graphene oxide) nanomaterials showed synergy in electrical and mechanical properties. Here, we reported the infiltration of carboxylic functionalized single-walled carbon nanotubes (C-SWNT) into free-standing graphene oxide (GO) paper for better electrical and mechanical properties than native GO. The stacking arrangement of GO sheets and its alteration in the presence of C-SWNT were comprehensively explored through scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction. The C-SWNTs bridges between different GO sheets produce a pathway for the flow of electrical charges and provide a tougher hybrid system. The nanoscopic surface potential map reveals a higher work function of the individual functionalised SWNTs than surrounded GO sheets showing efficient charge exchange. We observed the enhanced conductivity up to 50 times and capacitance up to 3.5 times of the hybrid structure than the GO-paper. The laminate of polystyrene composites provided higher elastic modulus and mechanical strength when hybrid paper is used, thus paving the way for the exploitation of hybrid filler formulation in designing polymer composites.

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Nanoscale friction of graphene oxide over glass-fibre and polystyrene

Cited by 21 publications

References 55 publications

Graphene Deposition on Glass Fibers by Triboelectrification

Graphene Deposition on Glass Fibers by Triboelectrification

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

Free-Standing Graphene Oxide and Carbon Nanotube Hybrid Papers with Enhanced Electrical and Mechanical Performance and Their Synergy in Polymer Laminates

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