Ong Hui Lin
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Preferred name
Ong Hui Lin
Official Name
Ong, Hui Lin
Alternative Name
Ong, Huilin
Ong, H. L.
Lin, Ong Hui
Lin, O. H.
Lin Ong, Hui
Main Affiliation
Scopus Author ID
57189322712
Researcher ID
F-5201-2010

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  • Publication
    Review—Bibliometrics and current research trends on direct carbon-solid oxide fuel cells utilizing biomass as fuel
    (IOP Publishing, 2023)
    Michelle S. Carbonell
    ;
    Al Rey C. Villagracia
    ;
    Ong Hui Lin
    ;
    Ruey-An Doong
    Biomass is considered a viable alternative source of energy after thermochemical conversion techniques and activation methods are adopted for its conversion to biochar and activated carbon, respectively. This work provides the bibliometrics and recent developments on DC-SOFC using biochar as fuel and is further enhanced through the carbon activation method. This study reported the dominant researchers from different countries and their contributions to the development of DC-SOFC. This study provided an overview of the physicochemical characteristics of the biochar and its corresponding effect in the operation of a DC-SOFC in terms of the electrochemical performance when used as fuel. Data reveal that other biomasses can still be pyrolyzed and used as DC-SOFC fuel. This paper includes that among the alternative carbon fuels to date, pomelo peel char has the most efficient and effective biochar fuel for DC-SOFC, which yields the best output in terms of parameters such as peak power density and fuel utilization rate. The activation method, as applied in biochar fuel, is an effective way to enhance the performance of the fuel cell. Prospects and challenges addressing identified gaps for DC-SOFC with high power output operated with biomass as fuel are similarly discussed.
  • Publication
    Green synthesis and characterization of Graphene quantum dots from key lime juice
    (Springer, 2023)
    Nur Atirah Afifah Sezali
    ;
    Siew Suan Ng
    ;
    Ong Hui Lin
    ;
    Al Rey Villagracia
    ;
    Mohd Hanif Mohd Pisal
    ;
    Ruey-An Doong
    Graphene quantum dots (GQDs) are one of the members of graphene family with unique properties such as quantum confinement effect, photoluminescence effect, and strong conductivity. This work prepared the GQDs using lime juice obtained from the waste of locally grown key limes as the precursor. The hydrothermal method was used in the preparation of the GQDs. The fluorescence effect of the GQDs was observed under a UV lamp irradiation while other characterization was conducted using high-resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), X-ray powder diffraction (XRD), and Raman spectroscopy. The GQD preparation was successful with the emission of a strong blue color when the GQD was put under a 365 nm UV light irradiation. It was found that the particle size of the prepared GQDs was in the range of 0.7–2.8 nm with an average diameter of 1.3 ± 0.5 nm. The characterization results proved the formation of GQDs as one of the graphene nanomaterials.
  • Publication
    Energy efficiency of Briquettes from Queen Pineapple (Ananas Comosus [Linn.] Merr.) wastes using three organic binders
    (Springer, 2023)
    Michelle S. Carbonell
    ;
    Al Rey C. Villagracia
    ;
    Ong Hui Lin
    ;
    Ma. Kathrina M. Pobre
    Pineapple (Ananas comosus [Linn.] Merr.) farms generate a high volume of wastes composed of residual stalks, leaves, roots, and crowns including bruised butterballs which is equivalent to 70–80% of its production. Converting these wastes into biochar briquettes for bioenergy and biofuel application is needed to avoid water and soil contamination. In this work, we investigated the energy efficiency of Queen pineapple (QP) briquettes mixed with different starch binder’s raw material, namely the sweet potato (Ipomoea batatas), cassava (Manihot esculenta), and nami (Dioscorea hispida). The pineapple wastes were dried and carbonized using a drum-type carbonizer, while the sun-dried starch was extracted from the grated raw binder materials. The dried pineapple wastes mixed with the gelatinized starch were molded using a ten-port manual briquetting machine to produce the briquettes. Each set of briquettes was used to boil 500 ml of water, and the following quantities were measured: Water boiling time, length of briquette consumption, and density. Afterwards, the burning efficiency and heat transfer rate per unit mass of briquettes were computed. The results revealed that QP briquettes with Dioscorea hispida binder have the highest energy efficiency based on the mass burning rate and heat transfer rate of 3.71 g min−1 of 40.4 Jg−1 min−1 followed by 3.45 g min−1 and 26.36 4 Jg−1 min−1 for Ipomoea batatas binder, and, lastly, 3.30 g min−1 and 25.68 Jg−1 min−1 for Manihot esculenta binder, respectively. Dioscorea hispida is found to be the best starch binder source among the three crops for producing briquettes from QP wastes.
  • Publication
    Revealing the water resistance, thermal and biodegradation properties of Citrus aurantifolia crosslinked Tapioca Starch/Nanocellulose bionanocomposites
    (Springer, 2020)
    Ong Hui Lin
    ;
    Al Rey Villagracia
    ;
    Wei Tieng Owi
    ;
    Sam Sung Ting
    ;
    Hazizan Md Akil
    Moisture absorption, thermal and biodegradation properties of nanocellulose (NC) reinforced bionanocomposite tapioca starch (TS) films crosslinked with Citrus aurantifolia or lime juice (LJ) were investigated for food packaging applications. The films were synthesized by solvent casting using different amounts of nanocellulose and crosslinkers: lime juice and a commercial citric acid (CA). Nanocellulose as reinforcing filler was obtained from oil palm empty fruit bunches through acid hydrolysis. Crystallinity of all TS bionanocomposites was determined using X-ray diffractometry. TS bionanocomposites interaction with water was studied by means of moisture absorption, moisture content and swelling. Flory-Huggin model was used to measure the crosslinked density of crosslinked TS bionanocomposites which indicated successful crosslinking using LJ and CA for TS. The crystallinity of TS film increased from 43.5% for neat TS to 51.6% for TS film with inclusion of NC. LJ-crosslinked TS film with 1 wt% of NC (based on starch content) had the lowest moisture absorption and swelling ratio. TS bionanocomposites with LJ had better thermal and biodegradation properties compared to commercial CA-crosslinked TS biocomposites, which can be a potential food packaging material among the tested bionanocomposites.
      3  18
  • Publication
    Optimization design of the electromagnetic torque for Surface-Mounted PMSM Using GA and Finite Element Analysis for electric vehicle
    (Korean Institute of Electrical Engineers, 2022-09-01)
    Wong E.W.M.
    ;
    Mohd-Shafri S.A.
    ;
    Tiang Tow Leong
    ;
    Tan C.J.
    ;
    Ishak D.
    ;
    Mohd Saufi Ahmad
    ;
    Leong J.H.
    ;
    Ong Hui Lin
    This research offers an optimization design for a three-phase surface-mounted permanent magnet synchronous machine (SMPMSM) by employing the computer framework consists of finite element analysis (FEA) and genetic algorithm (GA) utilized in the applications of electric vehicles. This framework aims to evaluate and determine the optimal setting of SMPMSMs, which require maximum average electromagnetic torque (Tem_avg) and minimum its ripple (Tem_rip). Several motor performances, such as magnetic field distribution across the motor, magnetic flux density distribution in the mid air gap, phase back-EMF, electromagnetic torque, and its ripple, are investigated for the initial and optimal designs of PM machines during open-circuit and on-load conditions by using FEA. The important parameter of PM machines, i.e. the magnet pole-arc and slot opening angle are taken into account. In order to determine the objective function of the GA framework, the Tem_avg and the Tem_rip are used to formulate the computing equations where the fitness value provided by the computing framework is further assessed. The GA framework is used to assess the comparison of parameters and motor performance between the initial and optimal designs of 12s/8p PM motors in terms of electromagnetic torque under BLAC operation. Consequently, the framework of FEA and GA has been proven in the design of SMPMSM, which is very viable for electric cars by reducing the magnet materials and electromagnetic torque ripple.
      24  11
  • Publication
    Hydrogen adsorption on calcium-decorated planar aluminene using density functional theory
    (IOP Publishing, 2020)
    D S Bayasen
    ;
    A R Villagracia
    ;
    G R Pedrosa
    ;
    Lin H.
    ;
    Ong Hui Lin
    ;
    David M.
    ;
    N Arboleda
    With the rising demand for clean energy, the concept of hydrogen economy has grown more popular, and with this popularity the need for better hydrogen storage materials increases. Decorated surface materials such as planar hexagonal aluminene are being studied to determine their potential as good hydrogen storage materials. This study theoretically investigates hydrogen adsorption on aluminene decorated with calcium, where calcium is binded on the top, bridge and hollow sites of aluminene using density functional theory. Results on decoration adsorption have shown that calcium can easily bind a distance of 1.80 Ã… to 2.80 Ã… on the top, bridge and hollow sites with binding energies of 1.85 eV, 2.01 eV, and 3.32 eV, respectively. The density of states of the calcium-decorated surface show that its electronic property is generally maintained with zero magnetization. Small amount of charges were adsorbed from the aluminium atoms to the calcium atom based on the charge difference. This leads to hydrogen molecule adsorption with low adsorption energies ranging from 34.13 meV to 80.51 meV. In addition, minimal broadening of energy levels were shown by the density of states. With these results, it can be concluded that planar hexagonal aluminene with low concentration of calcium atoms may lower the hydrogen capacity of aluminene.
      7  2
  • Publication
    The Influenced of Different Magnetization Patterns on the Performance of the Semi-buried Permanent Magnet Synchronous Machine
    ( 2021-06-11)
    Syauqina Akmar Mohd-Shafri
    ;
    Muhamad Haniff Sani
    ;
    Tiang Tow Leong
    ;
    Ishak D.
    ;
    Mohd Saufi Ahmad
    ;
    Leong Jenn Hwai , Jenn
    ;
    Tan C.J.
    ;
    Ong Hui Lin
    The performance of semi-buried permanent magnet synchronous machines (SBPMSMs) by the influence of two magnetization patterns are presented in this paper. These magnetization patterns include radial and parallel, which applied into 9-slot/8-pole (9s/8p) and 6-slot/4-pole (6s/4p) SBPMSMs. Hence, to evaluate the machines performance, AutoCAD and Opera2D finite element software are used to model and predict the electromagnetic characteristic performance of SBPMSMs. Two PM machines are optimized i.e. flux density distribution, phase back-EMF, and cogging torque by two magnetization patterns. The phase back-EMF of the machines are computed into harmonic components to investigate the total harmonic distortion (THDv ). It is found that the lowest THDv for both 9s/8p and 6s/4p motors are in parallel magnetization (PaM), which are 8.66% and 3.98%, respectively. However, the lowest cogging torque for 9s/8p is radial magnetization (RaM), which is 0.0101 Nm and for 6s/4p is 0.1730 Nm with parallel magnetization pattern. By comparing the result of the optimum magnet pole arc for both motors, the 6s/4p motors show the minimum cogging torque and harmonic distortions are 0.16 Nm and 1.63% in PaM patterns. As a result, optimum motor performances among these two motors are 6s/4p PM motors with PaM pattern.
      1  28
  • Publication
    Preparation and characterization of cellulose acetate from rice straw
    (Springer, 2023)
    Nur Atirah Afifah Sezali
    ;
    Ong Hui Lin
    ;
    Mohd Hanif Mohd Pisal
    ;
    Nora Jullok
    ;
    Maria Carla Manzano
    ;
    Al Rey Villagracia
    ;
    Ruey-an Doong
    Rice straw is one of the agricultural crop residues, and it can be utilized for its rich cellulose content. This work extracted cellulose from the locally collected rice straw and prepared the cellulose acetate from the rice straw-derived cellulose. The cellulose was isolated by an extraction process using an alkaline deep eutectic solvent, followed by bleaching to remove lignin and hemicellulose, and lastly the purification of cellulose for efficient acetylation process. The prepared cellulose acetate was characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), and differential scanning calorimetry (DSC) to confirm the successful acetylation of cellulose. The properties of the prepared cellulose acetate were compared with the commercial cellulose acetate. The FTIR result confirmed the replacement of hydroxyl groups on cellulose structure by the acetyl groups while the XRD analysis has resulted in the crystallinity index of 25.7% for the prepared cellulose acetate. As one of the cellulose derivatives, the cellulose acetate prepared from the rice straw-derived cellulose showed better thermal properties as the melting temperature was found to be more than 300 °C.
      1  4
  • Publication
    Chemical reactivity and bioactivity properties of pyrazinamide analogs of acetylsalicylic acid and salicylic acid using conceptual density functional theory
    (Elsevier, 2020)
    Al Rey Villagracia
    ;
    Ong Hui Lin
    ;
    Faith Marie Lagua
    ;
    Glenn Alea
    Conventional drugs used to treat Tuberculosis (TB) are becoming ineffective due to the occurrence of multiple drug resistant strains of tuberculosis (TB). This has made the TB disease a a serious global health dilemma. Hence, there is desperate necessity for the advancement of new drugs. In this work, the chemical reactivity and bioactivity of several analogs ofpyrazinamide (PZA) were investigated. PZA is one of the first-line of drugs used to treat tuberculosis and is a key contributor to shortening the treatment time for the disease. Chemical reactivity descriptors of pyrazinamide (PZA) and its analogs of acetylsalicyclic acid and salicyclic acid were investigated using conceptual density functional theory in water as a solvent at the MN12SX/Def2TZVP level of theory. Results have shown that all PZA analogs have improved their global and local reactivity indeces as compared to pyrazinamide based on its electronegativity, electrodonating power, electroaccepting power, eletrophilicity, global hardness and dual descriptor condensed fukui indexes. Moreover, their pKa values are slightly higher than PZA. In terms of its drug-likeness, all PZA analogs passed the Lipinski's Rule of Five criteria. Furthermore, their bioactivity scores are significantly better than pyrazinamide indicating good reaction to G-Protein Coupled Receptor (GPCR) ligands, kinase inhibitors, ion channel modulators, nuclear receptor ligands, protease inhibitors and other enzyme targets. Overall, the PZA analogs are found to be promising anti-tuberculosis drugs. Based on global and local reactivity descriptors, pKa and bioactivity scores, PZA analog of 5-n-Octanoylsalicylic acid is the most reactive among the PZA analogs tested.
      1  8
  • Publication
    Optimal Design of SMPMSM Using SD-model based on Genetic Algorithm
    ( 2021-01-01)
    Syauqina Akmar Mohd-Shafri
    ;
    Tiang Tow Leong
    ;
    Tan C.J.
    ;
    Ishak D.
    ;
    Mohd Saufi Ahmad
    ;
    Leong Jenn Hwai , Jenn
    ;
    Ong Hui Lin
    This paper deals with an optimal design of a surface-mounted permanent magnet synchronous machine (SMPMSM) with an exact analytical subdomain model by using a genetic algorithm method. To analyze the characteristic of permanent magnet (PM) motors, the classical optimization method, such as the finite element method (FEM), is intensively used. However, FEM has several time problems that require a longer computational time to evaluate the performance of PM motors. This problem can be overcome by using a genetic algorithm (GA) method combined with a subdomain model (SD), which developed an improved performance of SMPMSM, for instance, total harmonic distortion (THDv) and cogging torque. In this design, a three-phase 12-slot/8-pole PM motor is established with an exact SD model with RM and PaM magnetization patterns. Then, the GA ensemble with SD model to search the optimality of SMPMSM machine design. In the final analysis, the optimal new design of SMPMSM demonstrated by comparing with the initial design that is investigated by FEM. The result of induced back-EMF, cogging torque, total harmonic distortion, and magnetic flux density of optimal design is compared with the initial design to show the advantages of GA optimization method.
      1