Firuz Zainuddin
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Preferred name
Firuz Zainuddin
Official Name
Firuz, Zainuddin
Alternative Name
Firuz, Z.
Firuz, Zainuddin
Zainudin, Firuz
Zainuddin, F.
Main Affiliation
Scopus Author ID
55955213100
Researcher ID
AAC-4690-2019

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  • Publication
    Effect of filler size and loading on thermo-mechanical degradation of polypropylene-ethylene/wollastonite composite
    (IOP Publishing, 2020)
    Lip Teng Saw
    ;
    Firuz Zainuddin
    ;
    Cao Xuan Viet
    ;
    Du Ngoc Uy Lan
    This study is to understand the side effect of wollastonite fillers in polymer compounding that caused different levels of thermo-mechanical degradation (TMD) during extrusion. Wollastonite has a needle-like structure with different ratio of L/D; it compounded with the polypropylene-ethylene copolymer (PPcoE) using a twin-screw extruder. The effect on the TMD of PPcoE was determined by analysing the by-products within the extrudates via FTIR. The rheology of PPcoE composite was measured using a capillary rheometer, and the thermal stability of composite was studied using TGA. In this study, TMD is classified as two levels: chain scission and oxidisation. The wollastonite filler were found to accelerate the TMD mechanism and generated oxidised products during extrusion. The reduction of filler size effectively minimised the chain cleavage of PPcoE matrix, also come with improvement in thermal stability. However, increasing the filler loading had a dominant effect of inducing more chain cleavage on the polymer matrix.
      1  3
  • Publication
    Effect of Sodium Bicarbonate Additions on the Physical, Mechanical and Bioactive Property of Sol-Gel Bioglass
    ( 2020)
    Syed Nuzul Fadzli Syed Adam
    ;
    Alias Suffi Irni
    ;
    Firuz Zainuddin
    Porous bioceramics are the materials of choice for non-load bearing bone implants. Calcium phosphates and bioglass are widely used due to excellent biocompability. The primary function of porous bioceramics are as filler material for bone defects. In this research, 10% amount of sodium bicarbonates (Na2HCO3) were mixed with sol-gel derived glass powder (SiO2-CaO-P2O5) and sintered at 700 C for 3 hours. It was found that, additions of sodium bicarbonate induced a foaming effect during sintering of bioglass thus increased the porosity content of the glass-ceramics obtained. However, the increased in porosity significantly reduced the compressive strength of the crystallized glass. The increased in porosity content and formation of sodium related phases within the crystallized glass matrix after sintering resulted in enhancement of its in vitro bioactivity property when tested in SBF solution.
      1  9
  • Publication
    Physical characteristic and in-vitro bioactivity property of sintered glasses made via sol-gel and powder sintering process
    ( 2022-12)
    Syed Nuzul Fadzli Syed Adam
    ;
    Firuz Zainuddin
    ;
    Azlin Fazlina Osman
    ;
    Hasmaliza Mohamad
    In this work, ternary system (SiO2-CaO-P2O5) biocompatible glass with different compositions (CaO/P2O5 ratio) were prepared by sol-gel method and sintering process. The physical characteristic and bioactive properties of each different sample composition were analyzed using XRF, particle sizer, N2 adsorption-desorption, FTIR, XRD, and FESEM-EDX. The sintered glass pellets were subjected to immersion studies in a simulated body fluid (SBF) solution for 14 days. All compositions of gel-glass particulates showed mesoporous-type structures and consisted of very high porosities with nano-pores in size. Different Ca/P ratios in gel-glass composition are affected by different porous characteristics. All compositions of sintered glass showed very good bioactive behavior by significant deposition of the carbonate apatite layer. Sintered glass with the Ca/P ratio = 2.33 showed very significant bioactive properties as it also comprised the highest pore volume and size. However, sintered glass with the lowest Ca/P ratio (Ca:P=1.50) showed a quite significant reduction in the bioactive property as it also consisted of the lowest pore volume and pore sizes. Hence, the in-vitro bioactivity property of sintered glass is significantly influenced by the increase in its porous characteristics due to differences in the Ca/P ratio.
      3  44