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

Research Output

Filters

3
3
Reset filters

Settings
Now showing 1 - 3 of 3
  • 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.
      40  9
  • Publication
    Tensile and morphology properties of polylactic acid/ treated typha latifolia composites
    ( 2013)
    Muthmirah Ibrahim
    ;
    Jalilah Abd Jalil
    ;
    Syarifah Nuraqmar Syed Mahamud
    ;
    Yusrina Mat Daud
    ;
    Salmah Husseinsyah
    ;
    Muhammad Rafi’ Yahya
    This paper is focused to investigate the effect of treated natural fiber (typha latifolia) content on tensile and morphology properties of polylactic acid (PLA)/treated typha latifolia (T-TyLa) composites. The composite was compounded using heated two roll mill and the composite samples were prepared through compression molding. Tensile test and scanning electron microscopy (SEM) analysis were carried out to study the properties of PLA/T-TyLa composites. The results showed that the tensile strength of PLA/T-TyLa composites was decreased for about 43% with initial addition of T-TyLa content. The tensile modulus of the composites was increased (23%-91%) with increasing of fiber content. However, increased in fiber content reduced the elongation at break for about 53%-67% of PLA/T-TyLa composites. The optimum increment was obtained at 30 wt% of fiber content. SEM results showed that fiber dispersion was better for PLA/T-TyLa composites at lower fiber content.
      9  19
  • 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