Siti Shuhadah Md Saleh
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Preferred name
Siti Shuhadah Md Saleh
Official Name
Siti Shuhadah, Md Saleh
Alternative Name
Siti Shuhadah, M. S.
Saleh, Siti Shuhadah Muhammad
Md Saleh, S.S
Saleh, S.S.M.
Siti Shuhadah, M.S.
Main Affiliation
Scopus Author ID
57212339952

Research Output
Now showing 1 - 2 of 2
  • Publication
    Properties of carbon nanotubes-calcium carbonate hybrid filled epoxy composites
    ( 2020-01-01)
    Siti Shuhadah Md Saleh
    ;
    Suhaimi S.M.
    ;
    Md Akil H.
    ;
    Nur Farahiyah Mohammad
    Carbon nanotubes (CNTs) have a great potential to be used as filler to enhance the mechanical properties of polymer composites due to excellent properties. However, CNTs have limitation of difficult to disperse in polymer matrix. The hybridization of CNTs and inorganic fillers can improve the dispersion and combine their properties in polymer composites. In the present work, the properties of the epoxy composites filled with carbon nanotube-calcium carbonate (CNTs-CaCO3) hybrid, at various filler loading (i.e., 1-5 wt.%) were studied. The CNTs-CaCO3 hybrid fillers were prepared by physically mixing (PHY) method and chemical vapor deposition (CVD) method. The tensile properties and hardness of both composites were investigated at different weight percentages of filler loading. The CNTs-CaCO3 CVD hybrid composites showed higher tensile strength and hardness than the CNTs-CaCO3 PHY hybrid composites. This increase was associated with the homogenous dispersion of CNT–CaCO3 particle filler. The morphological studies of fracture surfaces after tensile test by means of SEM showed homogenous dispersion of CNTs-calcium carbonate CVD hybrid in epoxy matrix. The result shows that the CNTs-calcium carbonate CVD hybrid composites are capable in increasing tensile strength by up to 116.4%, giving a tensile modulus of 40.3%, and hardness value of 39.2% as compared to a pure epoxy.
  • Publication
    Preparation of carbon nanotubes/alumina hybrid-filled phenolic composite with enhanced wear resistance
    ( 2023)
    Siti Shuhadah Md Saleh
    ;
    Mohd Firdaus Omar
    ;
    Hazizan Md Akil
    ;
    Muhammad Helmi Abdul Kudus
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Andrei Victor Sandu
    ;
    Petrica Vizureanu
    ;
    Khairul Anwar Abdul Halim
    ;
    Mohamad Syahmie Mohamad Rasidi
    ;
    Syarifah Nuraqmar Syed Mahamud
    ;
    Ion Sandu
    ;
    Norlin Nosbi
    Hybrid fillers can be produced via various methods, such as physical mixing and chemical modification. However, there is a limited number of studies on the effect of hybridisation on the mechanical performance of hybrid filler-reinforced polymer composites, especially in the context of wear performance. This study investigated the wear resistance of carbon nanotubes (CNTs)/alumina hybrid-filled phenolic composite, where two hybrid methods were used to produce the CNTs/alumina hybrid filler. The CNTs/alumina (CVD hybrid) was synthesised using the chemical vapour deposition (CVD) method, whereas the CNTs-/alumina (physically hybrid) was prepared using the ball milling method. The CNTs/alumina hybrid filler was then used as a filler in the phenolic composites. The composites were prepared using a hot mounting press and then subjected to a dry sliding wear test using a pin-on-disc (POD) tester. The results show that the composite filled with the CVD hybrid filler (HYB composite) had better wear resistance than the composite filled with physically hybrid filler (PHY composite) and pure phenolic. At 5 wt%, the HYB composite showed a 74.68% reduction in wear, while the PHY composite showed a 56.44% reduction in wear compared to pure phenolic. The HYB composite exhibited the lowest average coefficient of friction (COF) compared to the PHY composite and pure phenolic. The average COF decreased with increasing sliding speeds and applied loads. The phenolic composites’ wear and average COF are in the order HYB composite < PHY composite < pure phenolic under all sliding speeds and applied loads.
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