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- Direct Digital Manufacturing of NanocompositesPublication . Mohan, Saeed D.; Nazhipkyzy, Meruyert; Carreira, Pedro; Santos, Cyril dos; Davis, Fred J.; Mateus, Artur; Mitchell, Geoffrey R.Additive manufacturing has surged in popularity as a route to designing and preparing functional parts. Depending on the parts function, certain attributes such as high mechanical performances may be desired. We develop a route for improving the mechanical properties of polymer devices, fabricated through additive manufacturing by combining electrospinning and stereo-lithography into one automated process. This process utilises the impressive mechanical properties of carbon nanotubes by encapsulating and aligning them in electrospun fibres. Composite fibres will be incorporated into polymer resins prepared with stereo-lithography, thereby providing resins that benefit from the composite fibres properties, enhancing their overall mechanical properties.
- Multiscale Structure Evolution in Electrically Conductive Nanocomposites Studied by SAXSPublication . Khan, Imran; Mohan, Saeed D.; Belbut, Miguel; Kamma-Lorger, Christina S.; Mateus, Artur; Mitchell, Geoffrey R.The successful introduction of nanostructured materials is hampered by the lack of a quantitative and qualitative understanding of the structure–property relationship within the nanocomposites. Variation in the electrical conductivity of nanocomposite materials depends on the structure evolution of the nanoscale fillers within the polymer phase. This article pertains to the small angle x-ray scattering study of electrically conductive nanocomposites to understand the structure-property relationship. The nanocomposites in this study are comprised of thermoset polyurethane as the matrix material with carbon nanotubes as the filler material. A percolation threshold of 0.5% wt/wt was observed along with substantial changes in the electrical conductivity of the nanocomposites. The small angle x-ray scattering data exhibits mass and surface fractal regimes indicating multiple structure evolution in the nanocomposites. Moreover, the data is interpreted using the crossovers of the scaling laws and sizes are measured to characterize the microstructure with a possible explanation for structural development.
- IntroductionPublication . Davis, Fred J.; Mohan, Saeed D.; Ibraheem, Muaathe A.This chapter provides a basic introduction to the topics described in this book. The principles of electrospinning, in terms of the influence of an electric field on a droplet of polymer melt or solution is introduced, and a review of some of the experimental parameters, and their relationship towards the properties of the fibres produced is given. A brief summary of the types of materials that can be electrospun is included, together with methods for their characterisation. Finally, a short review of potential applications for electrospun fibres is discussed.