Aligning multilayer graphene flakes with an external electric field to improve multifunctional properties of epoxy nanocomposites

Wu, Shuying; Ladani, Raj B.; Zhang, Jin; Bafekrpour, Ehsan; Ghorbani, Kamran; Mouritz, A.P.; Kinloch, A. J.; Wang, Chun H.

doi:10.1016/j.carbon.2015.07.026

Cited by 336 publications

(241 citation statements)

References 43 publications

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“…This alignment allows an anisotropic electrical and thermal conductivity as well as improvement of tensile properties due to the load transfer between the matrix and the nano-reinforcements. Wu et al [37] studied the alignment of GNP under an electric field and showed that the same behaviour could be observed as for CNT. Under an AC field, the anisotropic shape of GNP induced their rotation along the direction of the electric field, then the dipole interaction created by the non-constant field leads to an Bendto-end chain^formation.…”

Section: Alignment By Electric Fieldmentioning

confidence: 60%

“…resin viscosity, induced temperature, size and shape of nanoparticles, functionalisation, etc.). The post dispersion treatment of these composites can bring high isotropy and improvement of several properties such as better electrical conductivity [37], reduced fracture toughness for fibre composites [38], but is also dependant on the previous manufacturing steps used. In addition to the mentioned parameters, there are several such as temperature and nanoparticle quality whose effect on the properties of nanocomposites has not been fully investigated.…”

Section: Fabrication Challengesmentioning

confidence: 99%

“…However, some applications benefit from alignment of the nanoparticles to improve preferential orientation properties. Firstly, giving a preferential orientation to the nanoparticles leads to anisotropic electrical and thermal conductivity; some studies enhanced the electrical conductivity by 10 times or more in one direction, compared to the other two [37,61]. This orientation reduces the percolation threshold required for a nanocomposite to be conductive.…”

Section: Post-dispersion: Alignment Of Nanoparticlesmentioning

confidence: 99%

“…This allows a lower loading of nanoparticles to be used, thus decreasing the composite cost and likelihood of re-agglomeration. In this paper, two techniques of alignment are discussed: (i) electric field [25,26,37,61]; and (ii) a magnetic field [62][63][64][65][66][67][68][69] alignment.…”

Section: Post-dispersion: Alignment Of Nanoparticlesmentioning

confidence: 99%

“…This interaction is due to the higher polarisation of the CNT in the axis direction than the radial direction. Further studies have explored the influence of an electric field on the alignment of CNT [25,37,61]. Larijani et al [61] showed that in a polycarbonate matrix the DC field only prevents the aggregation of CNT meanwhile the AC or a magnetic field allows a well alignment.…”

Section: Alignment By Electric Fieldmentioning

confidence: 99%

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Effect of pre and Post-Dispersion on Electro-Thermo-Mechanical Properties of a Graphene Enhanced Epoxy

Poutrel

Wang

et al. 2016

Appl Compos Mater

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Graphene nanoplatelet (GNP) modified epoxy nanocomposites are becoming attractive to aerospace due to possible improvements in their mechanical, electrical and thermal properties at no weight cost. The process of obtaining reliable material systems provides many challenges, especially at larger scale (a volume effect). This paper reports on the main fabrication stages of GNP-based epoxy composites, namely (i) pre-dispersion, (ii) dispersion, and (iii) post-dispersion. Each stage is developed to show the interest and potential it delivers for property enhancement. Chemical modification of GNP is presented; functionalisation by Triton X-100 shows elastic modulus improvements of the epoxy at low particle content (≤3%). The post-dispersion step as an alignment of GNP into the epoxy by an electrical field is discussed. The electrical conductivity is below the simulated percolation threshold and an improvement of the thermal diffusivity of 220% when compared to non-oriented GNP epoxy sample is achieved. The work demonstrates how the addition of functionalised graphene platelets to an epoxy resin will allow it to act as electrical and thermal conductor rather than as insulator

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Section: Alignment By Electric Fieldmentioning

confidence: 60%

Section: Fabrication Challengesmentioning

confidence: 99%

Section: Post-dispersion: Alignment Of Nanoparticlesmentioning

confidence: 99%