Shuhaida Yahud
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Preferred name
Shuhaida Yahud
Official Name
Shuhaida, Yahud
Alternative Name
Yahud, S.
S., Yahud
Main Affiliation
Scopus Author ID
26424167000
Researcher ID
GLU-0274-2022

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Effect of graphite dopant in polyvinylidene flouride (PVDF) electrospun composites

2024-12 , Muhammad Zamzuri Mohd Saad , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud , Muhammad Asri Idris , Noorasikin Samat

Polyvinylidene Fluoride (PVDF) is a high purity thermoplastic fluoropolymer that has huge potential, has been employed in numerous electronics, space, and aeronautics industries. The beta-phase of PVDF is the most beneficial due to its superior piezoelectric and pyroelectric properties, which are essential for high-performance applications. Thus, the research on attaining the beta-phase has been critical. PVDF crystallinity could be enhanced by varying processing methods and parameters, including electrospinning. Various researchers have reported on the electrospinning PVDF as a successful route to get beta-phase. The morphology, crystalline phases, and electrical conductivity of PVDF fiber are significantly influenced by electrospinning parameters. In this work, the effect of graphite loading in PVDF is one of the parameters examined. The objective of this work is to investigate the impact of graphite dopant loading on the electrical conductivity of electrospun PVDF composite. The most straightforward and affordable way to create PVDF fibers is by electrospinning. PVDF was first dissolved using N, N-Dimethylformamide (DMF) before mixing with graphite (0.25 wt%, 0.50 wt%, 0.75 wt%, and 1.0 wt%). Each solution was then electrospinned to produce conductive composite fiber. The parameters were fixed at 25 kV voltage; 1.5 ml/h flow rate; and 12 cm tip-to-collector distance. The morphology, electrical conductivity, and crystalline phases of electrospun PVDF fibers were examined using scanning electron microscope (SEM), four-point probe and X-ray diffraction (XRD) machine. As the graphite concentration rises, SEM micrograph showed that more beads were developed along with fiber sizes increment. Short electrospinning times result in insufficient electrospun mat thickness, which affects peak shift, according to XRD examination of all fibers. According to the results of the four-point probe examination, the conductivity rises dramatically and the resistance decreases as the graphite concentration increases.

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Current development in interdigital transducer (IDT) surface acoustic wave devices for live cell in vitro studies: A review

2022-01-01 , Mazlee Mazalan , Anas Mohd Noor , Yufridin Wahab , Shuhaida Yahud , Zaman W.S.W.K.

Acoustics have a wide range of uses, from noise-cancelling to ultrasonic imaging. There has been a surge in interest in developing acoustic-based approaches for biological and biomedical applications in the last decade. This review focused on the application of surface acoustic waves (SAW) based on interdigital transducers (IDT) for live-cell investigations, such as cell manipulation, cell separation, cell seeding, cell migration, cell characteristics, and cell behaviours. The approach is also known as acoustofluidic, because the SAW device is coupled with a microfluidic system that contains live cells. This article provides an overview of several forms of IDT of SAW devices on recently used cells. Conclusively, a brief viewpoint and overview of the future application of SAW techniques in live-cell investigations were presented.

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Investigation on Polyvinyl Chloride (PVC) and Polycaprolactone (PCL) blend ratio: effect on their mechanical and physical properties

2023-07 , Siti Aishah Binti Abd Aziz , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud

The effect of blend ratio for polyvinyl chloride (PVC) and polycaprolactone (PCL) blends on their mechanical and physical properties has been studied in this report. Polymer blends which consists of polyvinyl chloride (PVC) and polycaprolactone (PCL) were prepared by solution casting method with different ratio of PVC/PCL (100/0, 70/30, 50/50, 30/70, 0/100). The tensile and flexural properties of PVC/PCL blends were observed in this work by using universal machine testing. The sample of PVC/PCL blends showed that the tensile and flexural strength of the blend systems increased as the PCL content increased. Hardness test showed that as PCL is absorbed into PVC, the hardness decreased, and this tendency decreased as the amount of PCL is increased. The surface morphology of the PVC/PCL blends was been examined using scanning electron microscopy. The surface morphology resulted that smooth surface can be seen with large pores in the pure PVC while rough surface appeared in the blends due to high content of PCL. The water absorption and density of the PVC/PCL blend is obtained by immersing the sample into the distilled water. The density result showed that the density of blends increased when the content of PCL increased. The water absorption result showed that by increasing the amount of PCL in the blends has decreased the percentage of water absorption.

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Investigation on the mixing ratio of Dimethylformamide (DMF) and acetone binary solvent on the electrospun Polyvinylidene Fluoride (PVDF) fiber

2023 , Muhamad Haikal Abdullah , Sharifah Shahnaz Syed Bakar , Shuhaida Yahud

Polyvinylidene Fluoride (PVDF) fibers were electrospun from PVDF solution with varied solvent mixing ratios of Dimethylformamide (DMF) and acetone in this work. The goal of this study is to see how the mixing ratio of DMF and acetone as solvent affects the fiber size, crystal structure, and electrical conductivity of PVDF fiber. In weight, the solvent mixing ratios are 100 DMF:0 acetone, 70 DMF:30 acetone, 50 DMF:50 acetone, 30 DMF:70 acetone, and 0 DMF:100 acetone. To be employed in this study, the PVDF solution was fixed at a concentration of 15%. The electrospinning machine parameters were likewise set to 20 kV, 10 cm tip-to-collector distance (TCD), and 1 mL/h flow rate. After the electrospinning process is completed, the sample will be kept for a short period of time in room temperature to allow the fiber to dry before being taken for characterization stages. Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Four-Point Probe (FPP) were used to examine the fibers. The fiber size of electrospun PVDF fibers is shown by SEM; the crystal structure of the electrospun PVDF fiber is shown by XRD; and the electrical resistivity of the electrospun PVDF fiber is shown by FPP. According to the results of the experiment, one of the five samples is in powder form, while the other is in fiber form. Two of the four fibers produced contain beads, as determined by SEM. For XRD and FPP characterization, it was discovered that a sample with a high peak intensity of β phase produces the maximum electrical conductivity.

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Comparison between wet and dry transfer Fe₂O₃-CNT hybrid thin films as room-temperature Liquefied Petroleum Gas (LPG) sensors

2023-12 , Sutichai Chaisitsak , Buaworn Chaitongrat , Shuhaida Yahud , Ahmad Faizal Salleh

Fe₂O₃-CNT hybrid thin films are promising candidates for room-temperature gas sensors with high sensitivity, rapid response, and recovery times. In this work, we reported the suitable fabrication strategies of Fe₂O₃-CNT hybrid thin films as liquefied petroleum gas (LPG) sensors by comparing the dry (without using aqueous solutions) and wet processes. Fe-CNT hybrid thin films were used as the primary material for synthesizing Fe₂O₃-CNT hybrid thin films, which were then annealed in air at 350⁰C to create α-Fe₂O₃. Characterizations by X-ray photoelectron spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy (FE-SEM) confirmed the decoration of α- Fe₂O₃ nanoparticles on CNT surfaces. The transfer process had effects on the surface morphology and sensor characteristics. FE-SEM presents that the surface morphology of the wet-transfer Fe₂O₃-CNT films was web-like structures with a highly porous morphology. Whereas the surface morphology of the dry-transferred Fe₂O₃-CNT films was a branch-like structure. The I-V relationship of both annealed wet- and dry- films was non-linear indicating the present of n-type α- Fe₂O₃. Under 5 vol.% of LPG, the wet-transferred Fe₂O₃- CNT films have higher sensitivity (S = ~ 3% Tresp.= 10 s, trec.= 59s) compared to the dry- transferred Fe₂O₃-CNT films (S = ~ 1.4%, Tresp.=90s, trec.= incomplete recovery). Moreover, the wet-transferred Fe₂O₃-CNTs could detect LPG concentration at a lower value than 25% of LEL (Lower Explosive Limit) with rapid response and recovery time of 23 s and 49 s, respectively.

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Investigation on the effect of electrospinning parameters: voltage and flow rate on PVDF fiber

2023 , Ammar Athallah Budiarto , Sharifah Shahnaz Syed Bakar , Shahrizam Saad , Shuhaida Yahud

Polyvinylidene fluoride (PVDF) is a high purity thermoplastic fluoropolymer and high-capacity polymer that is employed in the electronics, space, and aeronautics industries. Electrospinning parameters have a considerable impact on the morphology, crystallinity, and electrical conductivity of PVDF fiber. Voltage and flow rate are the electrospinning parameters investigated in this study. As a result, the goal of this study is to investigate the effects of various voltages and flow rates on PVDF electrospun fiber. Electrospinning is the simplest and low-cost method to produce PVDF fibers by dissolving PVDF in solvent N, N-Dimethylformamide (DMF). About 15 wt% PVDF solution was used. Electrospinning parameters used were varied applied voltages 15 and 20 kV, flow rates 0.8, 1.0, 1.2, and 1.4 ml/h. Tip-to-collector distance was fixed at 15 cm. Scanning electron microscope (SEM), four-point probe, and X-ray diffraction (XRD) were performed to determine the morphology, electrical conductivity, and crystallinity phase of electrospun PVDF fibers. The SEM analysis concluded that bead formation occurs at higher flow rate and higher voltage. With higher flow rates and lower applied voltage, the fiber's thickness increases. XRD analysis shows that shift peak is observed among all fibers due to short electrospinning time which leads to insufficient thickness of electrospun mat, which affects the mechanical properties of fibers and causes peak shift. Four-point probe analysis concluded that the average conductance increases sharply as flow rate increases and the average resistance decreases. Also, as applied voltage increases, average conductance decreases and the average resistance increases.

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