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
    3D spacer fabric structured airflow channel for enhanced solar desalination with efficient multi-energy harvesting
    (Elsevier B.V., 2025)
    Can Ge
    ;
    Duo Xu
    ;
    Xiao Feng
    ;
    Heng Du
    ;
    Ze, Chen
    ;
    Ong Hui Lin
    ;
    Chong Gao
    ;
    Guilong Yan
    ;
    Jian Fang
    Solar steam generation (SSG) is a sustainable way to drive seawater desalination and wastewater purification with green environmental energies including solar radiation, ambient heat, and airflow. Airflow is ubiquitous in outdoor environments, however, the utilization of airflow for accelerated evaporation through structure engineering remains unclear. Herein, environmental energies are efficiently utilized in an integrated way with the rational design of 3D spacer fabric. Carbon fiber bundles with broadband photothermal conversion ability and Tencel yarns with superior hydrophilicity are fabricated into the 3D spacer fabric. The stereoscopic airflow channel, wide evaporation surface area, and separated layers are constructed to optimize airflow pathways. Heat loss is reduced through the accelerated evaporation cooling effect. Extra ambient heat is harvested for cold evaporation by efficient airflow utilization. The evaporation rate of 3D spacer fabric reaches 5.15 kg·m−2·h−1 under a convective airflow of 3.5 m·s−1, which is twice the rate of traditional plain fabrics. The outstanding salt resistance is realized due to the separate design of photothermal and water supply layers as well as the continuous water circulation. The structural engineering of condenser devices is also investigated for enhanced airflow utilization. Overall, this work presents an effective and comprehensive multi-energy harvesting strategy to achieve rapid and durable SSG for practical clean water production.
  • 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  25
  • 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  11
  • Publication
    Swelling, tensile and thermal behaviors of citric acid crosslinked Tapioca starch/cellulose biocomposite films
    (Trans Tech Publications Ltd., 2020)
    Salleh Morgan Noor Zulaika
    ;
    Ong Hui Lin
    ;
    Firuz Zainuddin
    The biocomposite films were prepared using a solution casting method and allowed to dry in the oven of 50 °C. The cellulose used in this research was extracted from the rice straw. The biocomposite films firstly were prepared without crosslinker with various cellulose content; (0.2, 0.4, 0.6, 0.8 and 1.0) g wt%. Based on the tensile strength result, 0.6 g of cellulose is an optimum amount to prepare the biocomposite films with various amounts of crosslinker; (1, 2, 3, 4 and 5) g. The tapioca starch/cellulose biocomposite films crosslinked with lemon juices have higher tensile strength (16 MPa) and lower in swelling percentage (3.32%) compared to the biocomposite films crosslinked with key lime juice (5.44 %). The thermal behavior was studied based on the Differential Scanning Calorimetry test shows the biocomposite film that highly crosslinked needs higher energy during their phase change. The energy liberated in the tapioca starch/cellulose biocomposite film with key lime juice as crosslinker is 201.6 J/g while that of biocomposite film with lemon juice as crosslinker is 383.0 J/g.
      2  5
  • 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  36
  • Publication
    First principles investigation on the nitrogen-doped planar aluminene for hydrogen storage application
    (IOP Publishing, 2020)
    G R Pedrosa
    ;
    A R Villagracia
    ;
    D S Bayasen
    ;
    Ong Hui Lin
    ;
    David M.
    ;
    N Arboleda
    ;
    H., Lin.
    With the rise of carbon emission daily, a pursuit for cleaner energy such as hydrogen fuel is necessary. Obtaining a good hydrogen storage is one of the main bottleneck to achieve a working hydrogen economy. Materials including two-dimensional systems have been widely investigated for potential hydrogen storage. In this work, the effects of nitrogen on the hydrogen adsorption on planar hexagonal aluminene was studied using density functional theory. Aluminene was decorated with nitrogen at different sites: top, hollow and bridge. Results showed that nitrogen was adsorbed at the top, bridge and hollow sites at a distance of 0.00Ã… to 1.80 Ã… with binding energies of 2.71 eV, 4.88 eV, and 3.44 eV, respectively. Comparing to the pristine aluminene, there was no major difference with its electronic and magnetic properties based on the density of states of the nitrogen-doped aluminene while the nitrogen atom gained some charges from the aluminium atoms based on the charge difference. On the other hand, a hydrogen molecule was adsorbed with binding energies ranging from 13.4meV to 26.3 meV close enough to the adatom on the decorated system. Minimal broadening of energy level was found from the density of states. This work shows that aluminene with nitrogen impurity can adsorb hydrogen molecules. However, high concentration of nitrogen will lower the hydrogen capacity of aluminene.
      9  1
  • Publication
    Graphene Oxide incorporated polysulfone substrate for flat sheet thin film nanocomposite pressure retarded osmosis membrane
    (MDPI, 2020)
    Siti Nur Amirah Idris
    ;
    Nora Jullok
    ;
    Woei Jye Lau
    ;
    Ong Hui Lin
    ;
    Cheng-Di Dong
    This study focuses on the development of flat sheet thin film nanocomposite (TFN) pressure retarded osmosis (PRO) membranes for the enhancement of osmotic power generation by the incorporation of laboratory-synthesised graphene oxide (GO) into the polysulfone (PSf) polymer matrix. A series of membranes containing different weight percent of GO (0, 0.1, 0.25, 0.5 and 1.0 wt%) were fabricated via a phase inversion method with polyethylene glycol (PEG) as the pore forming agent. The results show that the TFN-0.25GO membrane has excellent water flux, salt reverse flux, high porosity and an enhanced microvoids morphology compared to the control membrane. The highest power density was achieved when TFN-0.25GO was used is 8.36 Wm−2 at pressure >15 bar. It was found that the incorporation of GO into the polymer matrix has significantly improved the intrinsic and mechanical properties of the membrane.
      6  16