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Singh A.,Materials and Surface Science Institute MSSI | Singh A.,University of Limerick | Gunning R.D.,Materials and Surface Science Institute MSSI | Gunning R.D.,University of Limerick | And 3 more authors.
Chemical Communications | Year: 2010

Coulomb repulsion due to the surface charge on semi-conductor nanorods works against the dipole-dipole attraction that tends to direct the nanorods to self-assemble; the nature of this self-assembly for CdSe nanorods can be thus altered by pyridine washing, which charges the rods surface - thereby allowing the Coulomb repulsion to tailor the alignment. © 2010 The Royal Society of Chemistry.

Vaughan T.J.,Materials and Surface Science Institute MSSI | McCarthy C.T.,Materials and Surface Science Institute MSSI
Composites Science and Technology | Year: 2010

A technique is presented where actual experimental distributions, measured from a high strength carbon fibre composite, are considered in the development of a novel method to generate statistically equivalent fibre distributions for high volume fraction composites. The approach uses an adjusted measure of nearest neighbour distribution functions to define inter-fibre distances. The statistical distributions, characterising the resulting fibre arrangements, were found to be equivalent to those in the actual microstructure. Finite element models were generated and used to determine the effective elastic properties of the composite and excellent agreement was obtained. The algorithm developed is simple, robust, highly efficient and capable of reproducing actual fibre distributions for high strength laminated composite materials. It does not require further heuristic steps, such as those seen in fibre stirring/shaking algorithms, in order to achieve high volume fraction microstructures and provides a useful alternative to both microstructure reproduction and random numerical models. © 2009 Elsevier Ltd. All rights reserved.

Del Saz-Orozco B.,Materials and Surface Science Institute MSSI | Ray D.,Materials and Surface Science Institute MSSI | Stanley W.F.,Materials and Surface Science Institute MSSI
Polymer Composites | Year: 2015

The effects of two thermoplastic micro-veils, polyamide (PA) and polyethylene terephthalate (PET) veil, on the interlaminar fracture toughness of a glass fiber/vinyl ester (GF/VE) composite were investigated. The veils incorporated into the composite as interleaving materials were first characterized via scanning electron microscopy (SEM), differential scanning calorimetry (DSC), contact angle and tensile testing in order determine the best candidate as toughening agent for the GF/VE composite. Composite laminates were manufactured by vacuum-assisted resin infusion process. Double cantilever beam (DCB) testing was performed to investigate the Mode I type interlaminar fracture toughness of the composites, which was characterized by critical strain energy release rate (GIC). An increased GIC was obtained by incorporating the PA veil, but it changed negligibly by the addition of the PET veil. The analysis of the composites fracture surface via SEM revealed increased fiber bridging between adjacent plies in the case of PA veil interleaved composites which played a key role in enhancing the Mode I interlaminar fracture toughness. However, the PET veil present in the interlaminar region did not take part in any energy absorbing mechanism during the delamination, thus keeping the GIC of the composite unaltered. © 2015 Society of Plastics Engineers.

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