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  • 1.
    Aziz, Shazed
    et al.
    Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, Selangor, Malaysia.
    Suraya, A. R.
    Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, Selangor, Malaysia; Nanotechnology and Nanomaterials Group, Materials Processing and Technology Laboratory, Institute of Advanced Technology, University Putra Malaysia, Selangor, Malaysia.
    Rahmanian, S.
    Nanotechnology and Nanomaterials Group, Materials Processing and Technology Laboratory, Institute of Advanced Technology, University Putra Malaysia, Selangor, Malaysia.
    Salleh, M.A. Mohd
    Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, Selangor, Malaysia; Nanotechnology and Nanomaterials Group, Materials Processing and Technology Laboratory, Institute of Advanced Technology, University Putra Malaysia, Selangor, Malaysia.
    Effect of fibre coating and geometry on the tensile properties of hybrid carbon nanotube coated carbon fibre reinforced composite2014In: Materials & Design, ISSN 0261-3069, Vol. 54, p. 660-669Article in journal (Refereed)
    Abstract [en]

    Hierarchically structured hybrid composites are ideal engineered materials to carry loads and stresses due to their high in-plane specific mechanical properties. Growing carbon nanotubes (CNTs) on the surface of high performance carbon fibres (CFs) provides a means to tailor the mechanical properties of the fibre–resin interface of a composite. The growth of CNT on CF was conducted via floating catalyst chemical vapor deposition (CVD). The mechanical properties of the resultant fibres, carbon nanotube (CNT) density and alignment morphology were shown to depend on the CNT growth temperature, growth time, carrier gas flow rate, catalyst amount, and atmospheric conditions within the CVD chamber. Carbon nanotube coated carbon fibre reinforced polypropylene (CNT-CF/PP) composites were fabricated and characterized. A combination of Halpin–Tsai equations, Voigt–Reuss model, rule of mixture and Krenchel approach were used in hierarchy to predict the mechanical properties of randomly oriented short fibre reinforced composite. A fractographic analysis was carried out in which the fibre orientation distribution has been analyzed on the composite fracture surfaces with Scanning Electron Microscope (SEM) and image processing software. Finally, the discrepancies between the predicted and experimental values are explained.

  • 2.
    Rahmanian, S.
    et al.
    Department of Mechanical and Manufacturing Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Suraya, A. R.
    Materials and Processing Laboratory, Institute of Advanced Technology, University Putra Malaysia, Serdang, Selangor, Malaysia; Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Aziz, Shazed
    Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Zahari, R.
    Department of Aerospace Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Zainudin, E. S.
    Department of Mechanical and Manufacturing Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Mechanical characterization of epoxy composite with multiscale reinforcements: Carbon nanotubes and short carbon fibers2014In: Materials & Design, ISSN 0261-3069, Vol. 60, p. 34-40Article in journal (Refereed)
    Abstract [en]

    Carbon nanotubes (CNT) and short carbon fibers were incorporated into an epoxy matrix to fabricate a high performance multiscale composite. To improve the stress transfer between epoxy and carbon fibers, CNT were also grown on fibers through chemical vapor deposition (CVD) method to produce CNT grown short carbon fibers (CSCF). Mechanical characterization of composites was performed to investigate the synergy effects of CNT and CSCF in the epoxy matrix. The multiscale composites revealed significant improvement in elastic and storage modulus, strength as well as impact resistance in comparison to CNT–epoxy or CSCF–epoxy composites. An optimum content of CNT was found which provided the maximum stiffness and strength. The synergic reinforcing effects of combined fillers were analyzed on the fracture surface of composites through optical and scanning electron microscopy (SEM).

  • 3.
    Rahmanian, S.
    et al.
    Advanced Materials and Nanotechnology Lab, Institute of Advanced Technology, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Thean, K. S.
    Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Suraya, A. R.
    Advanced Materials and Nanotechnology Lab, Institute of Advanced Technology, University Putra Malaysia, Serdang, Selangor, Malaysia; Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Aziz, Shazed
    Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Salleh, M.A. Mohd
    Advanced Materials and Nanotechnology Lab, Institute of Advanced Technology, University Putra Malaysia, Serdang, Selangor, Malaysia; Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Yusoff, H. M.
    Department of Chemical and Environmental Engineering, University Putra Malaysia, Serdang, Selangor, Malaysia.
    Carbon and glass hierarchical fibers: Influence of carbon nanotubes on tensile, flexural and impact properties of short fiber reinforced composites2013In: Materials & Design, ISSN 0261-3069, Vol. 43, p. 10-16Article in journal (Refereed)
    Abstract [en]

    Dense carbon nanotubes (CNTs) were grown uniformly on the surface of carbon fibers and glass fibers to create hierarchical fibers by use of floating catalyst chemical vapor deposition. Morphologies of the CNTs were investigated using scanning electronic microscope (SEM) and transmission electron microscope (TEM). Larger diameter dimension and distinct growing mechanism of nanotubes on glass fiber were revealed. Short carbon and glass fiber reinforced polypropylene composites were fabricated using the hierarchical fibers and compared with composites made using neat fibers. Tensile, flexural and impact properties of the composites were measured, which showed evident enhancement in all mechanical properties compared to neat short fiber composites. SEM micrographs of composite fracture surface demonstrated improved adhesion between CNT-coated fiber and the matrix. The enhanced mechanical properties of short fiber composites was attributed to the synergistic effects of CNTs in improving fiber–matrix interfacial properties as well as the CNTs acting as supplemental reinforcement in short fiber-composites.

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