Magnetic alignment of Ni/Co-coated carbon nanotubes in polystyrene composites

Shi, Donglu; He, Pan; Zhao, Peng; Guo, Fei; Wang, Feng; Huth, Chris; Chaud, X.; Bud’ko, Sergey L.; Lian, Jie

doi:10.1016/j.compositesb.2011.04.014

Cited by 48 publications

(18 citation statements)

References 26 publications

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“…The field required to align them can present challenges; using a high voltage field requires a lot of energy, complex setup, and specific health and safety precautions. Using a less viscous matrix allows to decrease the field required to align the reinforcements [66] but would not be suitable for aerospace applications. To obtain this requirement, it is possible to use a low viscosity resin or preheat the resin before, with or without the addition of the hardener.…”

Section: Alignment By a Magnetic 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 a Magnetic Fieldmentioning

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%

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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“…Electroless plating was carried out at 30ºC for the low-and medium-phosphorus baths and at 80ºC for the high-phosphorus bath with stirrer agitation. The volume of all electroless Ni-P alloy plating baths was 0.5 dm 3 . The resulting Ni-P alloy coated MWCNTs were filtrated and rinsed.…”

Section: Preparation Of Metal-coated Cntsmentioning

confidence: 99%

“…A high mean density of metal coated CNTs can prevent the CNTs from becoming too easily airborne. CNTs coated with ferromagnetic metals can be controllably moved by magnetic fields, which may lead to CNT composites with highly controlled micro-textures [3]. CNTs deposited with catalytic metal particles may provide superior catalysts, with applications such as improved fuel cell electrodes [4].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of metal coated carbon nanotubes by electroless deposition for improved wettability with molten aluminum

Arai

Suzuki

Nakagawa

et al. 2012

Surface and Coatings Technology

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Ni-P alloy coated and Au/Ni-P alloy double-coated multiwalled carbon nanotubes (MWCNTs) were fabricated using electroless plating. Three types of electroless Ni-P alloy plating baths were prepared to coat the MWCNTs with Ni-P alloy films of varying phosphorus content. Electroless gold coating of the Ni-P alloy coated MWCNTs was also carried out using a non-cyanide bath. The microstructures of the coatings on the MWCNTs were examined by scanning electron microscopy and X-ray diffraction. The wettability of the metal-coated MWCNTs with molten aluminum was also evaluated. MWCNTs coated with Ni-P alloy films containing 9-25 at.% phosphorus content were fabricated by electroless deposition. Electroless gold deposition on the Ni-P alloy coated MWCNTs to form Au/Ni-P alloy double-coated MWCNTs was also possible. The wettability of the metal-coated MWCNTs with molten aluminum was significantly improved compared to that of non-coated MWCNTs. The coating metals of the MWCNTs dissolved into the molten aluminum, resulting in good wettability between the MWCNTs and molten aluminum and dispersion of the resulting bare MWCNTs in the aluminum matrix. The dissolved coating metals formed stable compounds with molten aluminum.

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“…The use of magnetic alignment in particular has gained considerable interest due to several advantages over the other techniques [23]. First of all, magnetic forces are contactless volume forces which do not produce any chemical alteration in the material and allow the remote orientation of anisotropic particles in 3D spatial configurations [20,26]. Second, permanent magnets and electromagnets are nowadays readily available and produce strong enough fields to orient the reinforcements and eventually actuate the composite [28].…”

Section: Introductionmentioning

confidence: 99%

Magnetic alignment of short carbon fibres in curing composites

Ciambella

Stanier

Rahatekar

2017

Composites Part B: Engineering

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAlignment of magnetic particles into a viscous fluid by a homogeneous magnetic field has been studied both experimentally and theoretically, but very few studies have investigated the effects of viscosity changes on the capability of achieving complex fibre assemblies in composite materials. In this paper, we study the alignment of short carbon fibres into a viscous matrix whose viscosity is made dependent on the time, in order to simulate the curing process of the composite. A simple model is derived which gives the evolution of fibre position and orientation in terms of the external field and shows good agreement with the experimental evidence on nickel coated carbon fibres embedded in PDMS. The model is used to predict the fibre distribution at curing and hence could be a useful tool to predict the mechanical, electrical and magnetic properties of the composite. A closed form expression of the minimum magnetic field intensity necessary to achieve the * Corresponding author

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Magnetic alignment of Ni/Co-coated carbon nanotubes in polystyrene composites

Cited by 48 publications

References 26 publications

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

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

Fabrication of metal coated carbon nanotubes by electroless deposition for improved wettability with molten aluminum

Magnetic alignment of short carbon fibres in curing composites

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