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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Chirogenesis and Pfeiffer effect in optically inactive Euˡˡˡ and Tbˡˡˡ Tris(β-diketonate) upon intermolecular chirality transfer from Poly- and Monosaccharide Alkyl Esters and α-Pinene: emerging Circularly Polarized Luminescence (CPL) and Circular Dichroism (CD)

2020 , Michiya Fujiki , Laibing Wang , Nanami Ogata , Fumio Asanoma , Asuka Okubo , Shun Okazaki , Hiroki Kamite , Jalilah Abd Jalil

We report emerging circularly polarized luminescence (CPL) at 4f-4f transitions when lanthanide (Euˡˡˡ and Tbˡˡˡ) tris(β-diketonate) embedded to cellulose triacetate (CTA), cellulose acetate butyrate (CABu), D-/L-glucose pentamethyl esters (D-/L-Glu), and D-/L-arabinose tetramethyl esters (D-/L-Ara) are in film states. Herein, 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate (fod) and 2,2,6,6-tetramethyl-3,5-heptanedione (dpm) were chosen as the β-diketonates. The glum value of Eu(fod)3 in CABu are +0.0671 at 593 nm (5 (Formula presented.) F1) and −0.0059 at 613 nm (5 (Formula presented.) F2), respectively, while those in CTA are +0.0463 and −0.0040 at these transitions, respectively. The glum value of Tb(fod)3 in CABu are −0.0029 at 490 nm (5 (Formula presented.) F6), +0.0078 at 540 nm (5 (Formula presented.) F5), and −0.0018 at 552 nm (5 (Formula presented.) F5), respectively, while those in CTA are −0.0053, +0.0037, and −0.0059 at these transitions, respectively. D-/L-Glu and D-/L-Ara induced weaker glum values at 4f-4f transitions of Eu(fod)3, Tb(fod)3, and Tb(dpm)3. For comparison, Tb(dpm)3 in α-pinene showed clear CPL characteristics, though Eu(dpm)3 did not. A surplus charge neutralization hypothesis was applied to the origin of attractive intermolecular interactions between the ligands and saccharides. This idea was supported from the concomitant opposite tendency in upfield 19F-NMR and downfield 1H-NMR chemical shifts of Eu(fod)3 and the opposite Mulliken charges between F-C bonds (fod) and H-C bonds (CTA and D-/L-Glu). An analysis of CPL excitation (CPLE) and CPL spectra suggests that (+)- and (–)-sign CPL signals of Euˡˡˡ and Tbˡˡˡ at different 4f-4f transitions in the visible region are the same with the (+)-and (–)-sign exhibited by CPLE bands at high energy levels of Euˡˡˡ and Tbˡˡˡ in the near-UV region.

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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.

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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.

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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.

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Effect of dispersibility of graphene nanoplatelets on the properties of natural rubber latex composites using sodium dodecyl sulfate

2022-01-01 , Che W.M. , Teh Pei Leng , Yeoh Cheow Keat , Jalilah Abd Jalil , Lim Bee Ying , Rasidi M.S.M.

Natural rubber latex/graphene nanoplatelet (NRL/GNP) composites containing GNP-pristine and GNP-SDS were prepared by a simple mechanical mixing method. The main objective was to study the effect of dispersibility of GNP on the properties in NRL. X-ray diffraction confirmed the adsorption of sodium sulfate dodecyl (SDS) on the GNP surface. The results showed that high filler loading diminished the physical and mechanical properties of the composites but successfully endured to satisfy electrical conductivity to the NRL/GNP composites. Besides, the SDS surfactant-filled system demonstrated better physical, tensile, electrical, and thermal stability properties than the GNP-pristine. The intercalated and dispersed GNP-SDS increased the number of routes for stress and heat transfer to occur and facilitated the formation of conductive pathways as well, leading to the improvement of the properties as compared to NRL/GNP-pristine composites. However, as the GNP-SDS loading exceeded 5 phr, the GNP-SDS localized in the interstitial layer of NRL, restricted the formation of crosslinking, and interfered with the strain-induced crystallization ability of the composites.

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The effect of liquid silicone rubber content on the properties of filled and unfilled natural rubber latex/liquid silicone rubber blend (NRL/LSR)

2022-05-18 , Ming C.W. , Teh Pei Leng , Jalilah Abd Jalil , Yeoh Cheow Keat , Lim J.H.

Polymer blend is known as the simplest method to obtain a new material by just blending two or more materials with suitable mixing technique. Most of the material engineers play their effort to improve the compatibility and miscibility of the blend components since this gives significant effect on the properties of the resulting materials. However, some of the creative engineers used the shortage of the immiscible blend material in the electronic application by inducing the double percolation with the aim to improve the electrical conductivity of the inherently insulating polymeric materials and at the same time conserve the attractive properties of the polymeric matrix. Herein, unfilled NRL/LSR and filled NRL/LSR with 7phr of GNP-SDS blend materials were prepared in order to investigate the effect of LSR content on the crosslink density, tensile properties, tear strength and electrical properties of the blend materials. It was found that the physical and mechanical properties of the materials declined with the increasing LSR content. Nevertheless, the modulus and the electrical properties of the filled NRL/LSR have been improved.

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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.

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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.

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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.

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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.

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