Mechanical properties and strain monitoring of glass-epoxy composites with graphene-coated fibers

Mahmood, Haroon; Vanzetti, L.; Bersani, M.; Pegoretti, Alessandro

doi:10.1016/j.compositesa.2017.12.023

Cited by 107 publications

(56 citation statements)

References 40 publications

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“…The treated fibers were then subjected to chemical reduction in an environment of hydrazine hydrate at 100 • C for 24 h to reduce GO to rGO. The details of the chemical reduction process can be found in the previous work of Mahmood et al [25]. Regardless of the adopted parameters, the color of the fibers passed from light brown to black (Figure 1c) after the chemical reduction.…”

Section: Code Go Concentration In Water (Wt%)mentioning

confidence: 94%

“…During the EPD process, the distance between the electrodes was kept constant at 2 cm, and both sides of the glass fiber fabric were treated for 5 min. The configuration of the experimental equipment used in the EPD treatment was taken from the previous work of Mahmood et al [25], in order to directly compare the results, while the deposition conditions (i.e., GO concentration and applied electric field) were systematically modified. The complete list of the conditions of the electrophoretic deposition of GO on glass fibers is reported in Table 1.…”

Section: Samples Preparationmentioning

confidence: 99%

“…The topic of strain monitoring of structural materials has taken a great deal of attention in the past decade, mainly because of the possibility to obtain information about the damage evolution within the materials in real time conditions. Fiber reinforced polymer (FRP) structures, being particularly sensitive to intrinsic damage mechanisms (i.e., delamination or matrix cracking), are thus ideal candidates for real time damage monitoring and detection [25]. It is thus clear that the in-situ monitoring of damage is a useful tool to increase the reliability and lifetime of composite structures, also making the maintenance of structural components less challenging [26].…”

Section: Introductionmentioning

confidence: 99%

“…EPD has recently proved to be a practical technique when depositing large amounts of nanosized particles on various substrates [42][43][44]. In a recent work, Mahmood et al [25] investigated the strain monitoring capability of glass/epoxy composites, in which a graphene interphase was created between the matrix and the reinforcement through EPD, starting from a GO water suspension with a concentration of 1 mg/mL (equivalent to 0.1 wt%), deposited applying an electrical field of 10 V/cm. GO was then chemically reduced to reduced graphene oxide (rGO) by lowering the oxygen content as low as 10% in the rGO sheets.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Dependent Strain/Damage Monitoring of Glass/Epoxy Composites with Graphene as a Piezoresistive Interphase

Mahmood

Dorigato

Pegoretti

2019

Fibers

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Graphene as an interphase not only improves the mechanical performance of fiber reinforced polymer composites but also induces functional properties like electrical conductivity, thus providing the possibility of strain monitoring in real time. At this aim, graphene oxide (GO) was electrophoretically deposited at different applied potentials on glass fibers to create a uniform coating and was subsequently chemically reduced to obtain a conductive layer of reduced graphene oxide (rGO). After the optimization of the deposition process, composite laminates were prepared by hand lay-up with an epoxy resin, followed by curing in vacuum bag. The deposited rGO interphase improved the dynamic moduli (storage and loss modulus), the flexural strength (+23%), and interlaminar shear strength (ILSS) (+29%) of the composites. Moreover, laminates reinforced with rGO-coated glass fibers showed an electrical resistivity in the order of ~101 Ω·m, with a negative temperature coefficient. The piezoresistivity of the composites was monitored under flexural loading under isothermal conditions, and strain/damage monitoring was evaluated at different temperatures through the change of the electrical resistance with the applied strain.

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Section: Code Go Concentration In Water (Wt%)mentioning

confidence: 94%

Section: Samples Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature Dependent Strain/Damage Monitoring of Glass/Epoxy Composites with Graphene as a Piezoresistive Interphase

Mahmood

Dorigato

Pegoretti

2019

Fibers

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“…In particular, a method of utilizing GO and rGO is proposed in which electrophoretic deposition (EPD) technique is used to deposit GO nanosheets on E-glass fibers (GF); while, for rGO, the same GO coated GF were subjected to a thermochemical reduction process, hence yielding rGO coated GF. The mechanical properties of the composites obtained by using both GO and rGO coated GF fibers aligned in an epoxy matrix were extensively investigated in our previous works both from the micromechanical [30] and macromechanical [31] points of view. The peculiar electrical (resistivity and permittivity) and thermal (stability and conductivity) behaviour induced in the epoxy/glass composites by the presence of GO/rGO interphases are experimentally investigated in this manuscript.…”

Section: Introductionmentioning

confidence: 99%

Tuning Electrical and Thermal Properties in Epoxy/Glass Composites by Graphene-Based Interphase

2017

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Abstract:Multiscale epoxy/glass composites were fabricated by using E-glass fibers (GF) coated with different types of graphene nanosheets deposited by electrophoretic deposition. Graphene oxide (GO) was first synthesized using modified Hummer's method and its subsequent ultrasonication in de-ionized water created a stable suspension of GO. GF were immersed in the water/GO suspension near a copper anode. The electrical potential applied between the electrodes caused GO to migrate towards the anode. Moreover, the GO coated yarns were exposed to hydrazine hydrate at 100 • C to obtain reduced graphene oxide (rGO) coated yarns. Both GO and rGO coated GF yarns were used to create unidirectional epoxy-based multiscale composites by hand lay-up. The presence of a conductive rGO coating on GF improved both the electrical and thermal conductivities of composites. Moreover, enhanced permittivity was obtained by rGO based epoxy/glass composites, thus giving the option of using such structures for electromagnetic interference shielding.

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Improvement Mechanism of Corrosion Resistance in a High‐Efficiency Binary Composite Rust Conversion Agent with Chelate Properties

et al. 2023

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In this study, the rust conversion coating that acts directly on the surface of rust layer, was studied from the preparation of rust conversion agents gallic acid (GA), 2‐hydroxyphosphonyl acetic acid (HPAA), and their compound (GA/HPAA), rust conversion effect and anticorrosive mechanism. Results show that 1) when GA and HPAA were combined to form GA/HPAA with a mass ratio of 2:1, the strengthening effect of rust conversion was observed, and a more complete, dense, and smooth covering film was generated on the rust surface. In this case, the corrosion current of GA/HPAA was reduced to 4.10 × 10−7 A cm−2, while the GA was 2.35 × 10−6 A cm−2 and HPAA was 2.16 × 10−6 A cm−2. 2) The mechanism of rust conversion and corrosion resistance can be expressed as that the chelation reaction can occur between the rust and rust conversion agent, which can generate new coordination covalent bonds O–Fe–O, P–O–Fe, and C–Fe–O. In this case, they can firmly lock the rust and prevent it from spreading further. Meanwhile, a highly cross‐linked dense anticorrosion protective film can be formed. Due to the presence of these chelating products, they can act as obstacles, prolonging the diffusion path of corrosive medium and slowing down the interaction with the metal matrix.

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Mechanical properties and strain monitoring of glass-epoxy composites with graphene-coated fibers

Cited by 107 publications

References 40 publications

Temperature Dependent Strain/Damage Monitoring of Glass/Epoxy Composites with Graphene as a Piezoresistive Interphase

Temperature Dependent Strain/Damage Monitoring of Glass/Epoxy Composites with Graphene as a Piezoresistive Interphase

Tuning Electrical and Thermal Properties in Epoxy/Glass Composites by Graphene-Based Interphase

Improvement Mechanism of Corrosion Resistance in a High‐Efficiency Binary Composite Rust Conversion Agent with Chelate Properties

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