Syarifah Nuraqmar Syed Mahamud
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Preferred name
Syarifah Nuraqmar Syed Mahamud
Official Name
Syarifah Nuraqmar, Syed Mahamud
Alternative Name
Mahamud, S. N.S.
Syed Mahamud, Syarifah Nuraqmar
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Scopus Author ID
57220196221

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  • Publication
    Electrical conductivity of poly(hydroxybutyrate-co-hydroxyvalerate)/ graphene biocomposites produced via different solvent
    ( 2021-05-03)
    Syarifah Nuraqmar Syed Mahamud
    ;
    Mohd Hanif Mohd Pisal
    ;
    Koh J.H.
    ;
    Jalil J.A.
    Poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) is among the most promising polymers used in a variety of applications, owing to its low cost, biodegradability, and nontoxicity. However, PHBV is electrically insulating; hence, limits its use in biomedical applications. This study demonstrates a straightforward and environment-friendly method to fabricate and modify the electrical conductivity of PHBV-based biocomposites by incorporating graphene (G) as conductive filler. PHBV/G bicomposite films were fabricated using acetic acid as an alternative to conventional solvents such as chloroform. The electrical conductivity of the biocomposite films with various loadings of graphene (0- 5 wt.%) was investigated by a two-point probe. It was discovered that, PHBV/G biocomposites at 5 wt.% graphene loading possess the highest electrical conductivity irrespective of the type of solvents used. Meanwhile, acetic acid casted PHBV/G biocomposite films have a greater electrical conductivity compared to chloroform casted PHBV/G biocomposite films.
  • Publication
    The potential of chitosan-polygonum minus leaf mediated silver-nanoparticles composite as green conductive biofilm
    ( 2024-12)
    Mohd Hanif Mohd Pisal
    ;
    Jalilah Abd Jalil
    ;
    Haiza Haroon
    ;
    Muhammad Nabil Fikri Abd Nasir
    ;
    Syarifah Nuraqmar Syed Mahamud
    ;
    Zhi-Fu Lin
    Silver-nanoparticles (AgNPs) from leaf extract have gained considerable interest from years ago until recently. However, the potential of green-synthesised AgNPs as a conductive filler in polymer biocomposites has not been widely investigated. Herein, a series of biopolymer-silver nanoparticle films were prepared by dispersing the suspension of Polygonum minus leaf mediated AgNPs into chitosan (CS) matrix via solution casting. In this work, the physicochemical properties of the composite films were evaluated, and structural property was analysed by Fourier transform infrared (FTIR) spectroscopy. The electrical conductivity and surface morphology were investigated by two-point probe and scanning electron microscopy (SEM), respectively. From the evaluation of moisture uptake, solubility and degradation tests, the rate of moisture uptake reduced as AgNPs concentration increased whereas the solubility and degradation rate increased with increasing addition of AgNPs. The FTIR analysis confirmed that there was no new covalent bond formed and suggested that AgNPs interact non-covalently with amine and hydroxyl groups of chitosan matrix. The conductivity of the CS-AgNPs films increased with one-order magnitude from 10-8 to 10-7 S/cm compared to pristine CS film. The percolation threshold was achieved at 20 wt% of AgNPs and the highest conductivity was achieved at 30 wt% AgNPs with the conductivity value of 3.20 x 10-7 S/cm. SEM micrographs revealed that the composite film with 30 wt% AgNPs exhibited smooth and homogeneous surface which agrees well with the conductivity results. This CS-Polygonum minus leaf mediated AgNPs composite film shows potential as an alternative for biodegradable biomedical implants, smart packaging and wearable electronics applications.
      46  9
  • Publication
    Effect of graphene nanoplatelet addition on the electrical conductivity of poly(hydroxybutyrateco-hydroxyvalerate) biocomposites
    ( 2021-11-12)
    Syarifah Nuraqmar Syed Mahamud
    ;
    Ganesan O.
    ;
    Mohd Hanif Mohd Pisal
    ;
    Rabat N.E.
    Poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) is one of the most promising biodegradable polymers used in many applications due to its biodegradability and non-toxicity. However, the usage of PHBV in electronic, biomedical, and biosensor applications has been limited due to its poor electrical properties. This study shows a simple method of producing and enhancing the electrical conductivity of PHBV-based biocomposites by adding graphene nanoplatelet (GNP) as a conductive filler. The biocomposite films were prepared using the solvent casting method, consist of five GNP loading (0-5 wt. %). The prepared PHBV/GNP biocomposites show enhanced electrical conductivity compared to neat PHBV. PHBV/GNP biocomposite with 5 wt. % filler loading exhibits the highest electrical conductivity at 3.83 × 10-3 S/cm. Higher crystalline regions in the PHBV/GNP biocomposites have facilitated the transfer of electrons between PHBV, resulting in the formation of conductive biocomposites, as evident from X-ray diffraction (XRD) characterization.
      3  19
  • Publication
    Influence of filler loading and in situ salicylic acid treatment on corn husk fiber filled poly(Hydroxybutyrate-co-valerate)
    ( 2020-07-09)
    Syarifah Nuraqmar Syed Mahamud
    ;
    Abdullah N.H.
    ;
    Mohd Hanif Mohd Pisal
    The effect of filler loading and in situ salicylic acid treatment on the mechanical properties and morphology of poly(hydroxybutyrate-co-valerate)/ corn husk fiber (PHBV/CHF) biocomposites was studied. Both untreated and salicylic acid treated PHBV/CHF biocomposites were prepared by using heated two roll mill followed by compression moulding. It was found that the addition of CHF to PHBV biocomposites increased the tensile strength and Young's modulus while the elongation at break decreased. Salicylic acid treated PHBV/CHF biocomposite display superior tensile strength and Young's modulus than untreated PHBV/CHF biocomposite due to the enhanced filler-matrix interaction. The better interfacial adhesion between CHF and PHBV matrix was confirmed through scanning electron microscope (SEM) analysis.
      1  20
  • Publication
    Effect of two different organic solvents on mechanical properties and electrical conductivity of carbonized wood fiber filled chitosan/polyethylene oxide conductive films
    ( 2022-05-18)
    Mohd Hanif Mohd Pisal
    ;
    Jalilah Abd Jalil
    ;
    Zainal M.I.
    ;
    Kumar N.K.
    ;
    Syarifah Nuraqmar Syed Mahamud
    ;
    Uthaipan N.
    Crystallization occurred upon the evaporation of solvent during solution casting usually affects the physical and chemical properties of the polymers. In this study, the effect of maleic acid (MA) and acetic acid (AA) as a solvent medium to dissolve conductive chitosan/polyethylene oxide/carbonized wood fiber (CS/PEO/CWF) film was investigated on their mechanical properties and electrical conductivity. The film with CS/PEO ratio of 70/30 and 25 wt% of CWF was prepared by dissolution in organic acid and casting into glass mold after sufficient stirring at room temperature. FTIR spectra revealed that the characteristic peaks of CS for CS/PEO/CWF-AA can be clearly understood while for CS/PEO/CWF-MA, the peaks were shifted, and some were less pronounced due to overlapping with MA residue peaks. The tensile test showed that CS/PEO/CWF-AA has better tensile strength, elongation at break and tensile modulus. We suggested that a higher crystallinity degree of CS/PEO/CWF-AA was responsible for the excellent properties. The presence of residual maleic acids after film-forming increases the brittleness of the films and lowers the tensile strength of CS/PEO/CWF-MA film. The conductivity value also favored CS/PEO/CWF-AA with the conductivity of 4.25 × 10-4 S/cm while the value for CS/PEO/CWF-MA was one order magnitude lower which is 3.46 × 10-5 S/cm. From the findings, we concluded that CS/PEO/CWF-AA formed crystalline orientation upon evaporation of AA and that promotes electron transfer resulting in higher conductivity. In conclusion, AA is a better solvent medium compared to MA for dissolution of CS/PEO/CWF to obtain conductive composite films. The difference in the structure of the organic acids has obviously affected the properties of the composite films. The conductive films have potential use as an eco-friendly material for active or intelligent packaging as well as biomedical applications.
      22  1