Jalilah Abd Jalil
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Preferred name
Jalilah Abd Jalil
Official Name
Abd Jalil, Jalilah
Alternative Name
Jalilah, A. J.
Jalil, J. A
Jalilah, Abd Jalil
Jalil, Jalilah Abd
Abd Jalil, Jalilah
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Scopus Author ID
56946938300
Researcher ID
EJZ-9130-2022

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  • Publication
    Chitosan/polyethylene oxide (Peo) filled carbonized wood fiber conductive composite film
    ( 2020-01-01)
    Mohd Hanif Mohd Pisal
    ;
    Jalilah Abd Jalil
    ;
    Anisah M.F.H.
    ;
    Tilagavathy A.
    Biopolymer-based conductive polymer composites (CPCs) would open up various possibilities in biomedical applications owing to ease of processing, renewable resource and environmentally friendly. However, low mechanical properties are a major issue for their applications. In this study, the investigated the conductivity of chitosan/ PEO blend films filled with carbonized wood fiber (CWF) prepared by solution casting. The effect of CWF was also investigated on tensile properties and their morphological surfaces. The tensile results from different ratios of chitosan/PEO blend films without CWF show that the tensile strength and modulus increased with the increase of chitosan content and chitosan/PEO blend film with 70/30 ratio exhibited the best combination of tensile strength and flexibility. However, a reduction of tensile strength was observed when CWF amount was increased while the modulus of the tensile shows an increment. The film also exhibited higher electrical conductivity as compared to low chitosan ratio. The addition of CWF greatly enhanced the conductivity three-fold from 10-10 to 10-6 S/cm. The electrical conductivity continued to increase with the increase of CWF up to 30 wt%. The surface morphology by Scanning Electron Microscopy (SEM) exhibits the absence of phase separation for the blends indicating good miscibility between the PEO and chitosan. Incorporation of CWF into the blend films at 5 wt% showed agglomeration. However, the increase of CWF created larger agglomerations that formed conductive pathways resulting in improved conductivity. FTIR analysis suggested that intermolecular interactions occurred between chitosan and PEO while CWF interacts more with the protons of PEO.
  • 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.
  • Publication
    The effect of the GNP-SDS loadings on the properties of the NRL/GNP-SDS composites
    ( 2020-07-09)
    Che W.M.
    ;
    Teh Pei Leng
    ;
    Jalilah Abd Jalil
    ;
    Yeoh Cheow Keat
    Stretchable conductive polymer composites (CPC) are fabricated by incorporating the conductive particles into the polymer matrix. In this paper, CPC was fabricated by incorporating the sodium dodecyl sulfate (SDS) modified graphene nanoplatelet (GNP) into natural rubber latex (NRL) by varying loading from 0phr to 9phr using a simple mechanical stirring method. The effect of the GNP-SDS loadings on the properties of the composites were study by investigated the crosslink density, tensile properties, morphology of the tensile fracture surface and electrical conductivity. The crosslink density of the composites shows a decreased trend. Then, due to the well dispersed GNP-SDS, the tensile strength increased but decreased at high filler loading caused by the agglomeration issue. The tensile modulus also increased with increasing filler loading due to the intrinsic high modulus of GNP and the reduction of chain mobility. However, the electrical properties of the composites improved as GNP-SDS loading increased and achieved a percolation threshold at 7phr.
  • 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.
  • Publication
    Investigation of blend ratios on physical, mechanical, and electrical properties of stretchable conductive ternary blend NRLVSR materials unfilled and filled system
    ( 2025-01)
    Wern-Ming Che
    ;
    Teh Pei Leng
    ;
    Jalilah Abd Jalil
    ;
    Yeoh Cheow Keat
    ;
    Mohamad Nur Fuadi Bin Pargi
    Stretchable conductive material has garnered significant attention in recent years since it offers both electrical conductivity and the ability to undergo significant deformation without losing its conductivity. Herein, NRL/VSR blend materials were prepared with varying blend ratios, both with and without GNP-SDS, using a simple mechanical stirring method. The main objective was to investigate the influence of blend ratios on the physical, mechanical, and electrical properties of the unfilled and filled blend systems. The findings revealed that the addition of VSR had a detrimental effect on the crosslink density of the resulting materials, leading to a negative impact on their mechanical properties. However, a contrasting observation was made regarding the electrical properties. The introduction of VSR induced the formation of a double percolation structure in the immiscible NRL/VSR blend. This double percolation structure facilitated the creation of a conductive network within the blend, which significantly improved its electrical properties by approximately 263.85 folds.
  • 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.
  • Publication
    The Impact of Chemically-Treated Carbonized Wood Fiber (CWF) in Polyethylene Oxide (PEO)/Chitosan Blend Films
    ( 2020-07-09)
    Hanif M.P.M.
    ;
    Jalilah Abd Jalil
    ;
    Nitiyah K.K.
    In this study, we investigated the effect of acid/alkaline-treated carbonized wood fiber (CWF) in polyethylene oxide (PEO)/Chitosan (70/30) blend film prepared by solution casting. We investigated the electrical conductivity, crystallinity percentage, crystal orientation, tensile properties, and morphology of the blend films filled with 25 wt% of untreated and acid/alkaline-treated CWF. From the results, the film filled with acid-treated CWF displayed the highest electrical conductivity when compared to the films filled with untreated and alkali-treated CWF. The x-ray diffraction (XRD) diffractograms reveal that the film filled with acid-treated CWF has the lowest crystallinity than the films filled untreated and alkaline-treated CWF. The reduction in d-spacing for the films filled treated CWF suggested improved crystal orientation for the promotion of electron transfer. The tensile properties were not affected much by the incorporation of CWF regardless of untreated or treated filler. The films with treated CWF showed slightly lower tensile strength and modulus but slightly higher elongation at break. The tensile results agree with reduced crystallinity for the blend films with both acid and alkaline treated CWF. The surface morphology of the films investigated by scanning electron microscopy (SEM) also displayed better dispersion of the conducting CWF inside the PEO/Chitosan matrix for the blends with treated CWF. The improved dispersion is due to less blockage with the presence of more amorphous regions. The presence of a broad network bridge smoothens the transfer of electrons and increases electrical conductivity.
  • Publication
    Effect of Uncarbonized and Carbonized Eggshell Powder on Mechanical and Thermal Properties of Recycled High Density Polyethylene/Ethylene Vinyl Acetate Blend Composites
    ( 2020-07-09)
    Mohd Hanif Mohd Pisal
    ;
    Jalilah Abd Jalil
    ;
    Naqiuddin M.R.M.
    The blend composites of recycled high density polyethylene (rHDPE)/ethylene vinyl acetate (EVA) were prepared by melt blending technique at 160 °C with rotor speed of 50 rpm within 10 minutes. Based on Fatimah et al. study[1], the optimum ratio rHDPE/EVA at 70/30 were studied and prepared for different loading of uncarbonized (fresh) and carbonized eggshell powder (5 to 25 wt%). The ESP was collected, washed, crushed, and sieved to obtained size 63 µm by method Farahana et al,.[2]. But she founded that, the mechanical properties reduced with incorporation of ESP filler. Nowadays, carbonized natural filler are the focus of some researchers and the CESP was undergoing a combustion process for 3 hours at 700 °C with air combustion via muffle furnace. The result showed tensile properties decreased with increasing filler loading for both fillers. Then, the mass swell percentage after 46 hours soaked in dichloromethane, the results showed an increment of both fillers were increased the mass swell caused by the hydrophilic nature of fillers. The intensity ratio, interlayer spacing, and crystallinity percentage value decrease with increasing filler loading for both filler give better interaction between matrix and filler. The thermal stability increase for both filler with increasing filler loading. Overall, rHDPE/EVA/CESP blend composites had excellent properties with the addition of carbonized filler.
  • Publication
    Chiral optofluidics: gigantic circularly polarized light enhancement of all-trans-poly(9,9-di-n-octylfluorene-2,7-vinylene) during mirror-symmetry-breaking aggregation by optically tuning fluidic media
    ( 2012)
    Michiya Fujiki
    ;
    Jalilah Abd Jalil
    ;
    Nozomu Suzuki
    ;
    Makoto Taguchi
    ;
    Wei, Zhang 1
    ;
    Mohamed Mehawed Abdellatif
    ;
    Kotohiro Nomura
    Here we report the first chiral optofluidic system that enables the emergence and enhancement of chiroptical signals of μm-sized polymer particles from achiral all-trans-poly(9,9-di-n-octylfluorene-2,7-vinylene) (PFV) during mirror-symmetry-breaking aggregation due to the optically active fluidic media consisting of (R)-limonene (1R) and (S)-limonene (1S), chloroform and methanol. These results were proven by refractive index (RI) and specific rotation (SR) of the media as well as circular dichroism (CD), optical rotatory dispersion (ORD), circular polarised luminescence (CPL), UV-vis and photoluminescence spectral characteristics of PFV. For comparison, a triple bond linker poly[(9,9-di-n-octylfluoren-2,7-diyl)-alt-yleneethynylene] (PFE) aggregate, which is an analogue of PFV, did not show any CD-signals in the π–π* transition. Gaussian 03 (TD-DFT, B3LYP, 3-21G basis set) calculations of PFV and PFE trimer models suggested that PFV is CD-/CPL-silent helix due to an equal proportion of P- and M-helices in a double-well with a small barrier height, conversely, that PFE is inherently optically inactive due to non-helix conformation in a single-well. Under optimised chiral optofluid with specific RI values of 1.38–1.39, the μm-sized PFV particles showed a great enhancement in Kuhn's dissymmetry amplitudes by ∼1500 times compared to the computed value in helical models of PFV; the gCD at 473 nm reached +0.078 (1S) and −0.104 (1R), and the gCPL at 474 nm attained +0.056 (1S) and −0.077 (1R), while maintaining a high quantum yield (ΦPL) of 75–88% with a short PL lifetime of ∼0.5 ns. For comparison, as for six π-conjugated molecular aggregates with/without H–H repulsions, including trans-stilbene and diphenylacetyelene, with the help of the 1R-/1S-based media, any detectable CD signals were not observed. These results led to the idea that optically active π-conjugated polymers carrying longer alkyl side groups in a double-well potential may be needed to efficiently generate the corresponding optically active aggregates in the chiral tersolvents.
  • Publication
    Swelling behavior and melt fracture of polypropylene-co-ethylene filled with sago starch extrudates by using twin screw extruder
    ( 2022-05-18)
    Nor Azura Abdul Rahim
    ;
    Huan G.T.
    ;
    Jalilah Abd Jalil
    ;
    Zunaida Zakaria
    ;
    Jikan S.S.
    Barus effect and melt distortion of an extrudate is the indication of viscoelastic nature of a polymer melt. Polypropylene-co-ethylene (PPcoE) filled with various amounts of sago starch were compounded using a co-rotating twin screw extruder and the extrudate blend swelling ratio and its appearance upon exiting the die at different screw speed and temperature were carefully analyzed. The Melt Flow Index (MFI) test and the morphology test using optical microscope (OM) were conducted to justify the obtained results. The addition of sago starch in PPcoE has significantly introduced a porous structure to the produced extrudates and the porosity became more obvious with the increasing amount of sago starch. Meanwhile, below 30 rpm screw speed, higher starch content generated lower extrudate swelling ratio. At constant screw speed of 30 rpm, a sign of flow instabilities occurred in the extrudate blends which can be directly evident from the captured OM image. In conclusion, the incorporation of sago starch in PPcoE has ultimately altered the melt strength of PPcoE which is concurrently reflected by the swelling behaviour and melt distortion of the blend.
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