ORCID Profile
0000-0001-7083-2521
Current Organisations
Universiti Teknologi Brunei,
,
Sri Dharmasthala Manjunatheshwara College of Engineering and Technology
,
Curtin University of Technology - Sarawak Campus Malaysia
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Publisher: Elsevier BV
Date: 08-2021
Publisher: Springer Science and Business Media LLC
Date: 02-11-2020
DOI: 10.1038/S41598-020-75936-3
Abstract: The recent implication of circular economy in Australia spurred the demand for waste material utilization for value-added product generations on a commercial scale. Therefore, this experimental study emphasized on agricultural waste biomass, rice husk (RH) as potential feedstock to produce valuable products. Rice husk biochar (RB) was obtained at temperature: 180 °C, pressure: 70 bar, reaction time: 20 min with water via hydrothermal carbonization (HTC), and the obtained biochar yield was 57.9%. Enhancement of zeta potential value from − 30.1 to − 10.6 mV in RB presented the higher suspension stability, and improvement of surface area and porosity in RB demonstrated the wastewater adsorption capacity. Along with that, an increase of crystallinity in RB, 60.5%, also indicates the enhancement of the catalytic performance of the material significantly more favorable to improve the adsorption efficiency of transitional compounds. In contrast, an increase of the atomic O/C ratio in RB, 0.51 delineated high breakdown of the cellulosic component, which is favorable for biofuel purpose. 13.98% SiO 2 reduction in RB confirmed ash content minimization and better quality of fuel properties. Therefore, the rice husk biochar through HTC can be considered a suitable material for further application to treat wastewater and generate bioenergy.
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 08-05-2021
Publisher: Springer Science and Business Media LLC
Date: 23-03-2020
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 25-05-2021
Publisher: Elsevier BV
Date: 06-2021
Publisher: Springer Science and Business Media LLC
Date: 03-09-2018
Publisher: Elsevier BV
Date: 10-2021
Publisher: Wiley
Date: 25-10-2022
Abstract: Ionogels have established themselves as an intriguing type of composites, owing to their distinctive properties, including superior thermal stability, non‐flammability, tunable electrochemical stability window, and high ionic conductivity. Hybrid materials based on ionic liquids (ionogels) are held together by interfaces arising out of intermolecular interactions, including electrostatic, van der Waals, solvophobic, steric, and hydrogen bonding. The interfaces within the ionic liquid (ILs) and its multifaceted interplay with the encapsulating matrix greatly influence the physicochemical and electronic/ionic interactions within the composite resulting in exceptional characteristics, allowing for the design of ionogels for targeted applications. Though ionogels have shown superior properties comparable to neat ILs, they still exhibit relatively low mechanical strength, limiting their application in several practical technologies. Simultaneous enhancement of mechanical durability while retaining high ionic conductivity is indispensable, which requires understanding interfaces and related influencing parameters. This review provides a synergetic comprehension, focusing on the interactive forces and factors affecting the conductivity, stability, and robustness of ionogels. Correlating with interfaces, several strategies, including the implications of nanofiller incorporation on the electromechanical properties of ionogel, are also elaborated. Finally, a primer is provided on the application of ionogels in sensors and energy harvesting technologies.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Springer Science and Business Media LLC
Date: 17-05-2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 10-10-2020
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 08-2021
Publisher: MDPI AG
Date: 04-07-2023
DOI: 10.3390/MOLECULES28135192
Abstract: Ionogels are hybrid materials comprising an ionic liquid confined within a polymer matrix. They have garnered significant interest due to their unique properties, such as high ionic conductivity, mechanical stability, and wide electrochemical stability. These properties make ionogels suitable for various applications, including energy storage devices, sensors, and solar cells. However, optimizing the electrochemical performance of ionogels remains a challenge, as the relationship between specific capacitance, ionic conductivity, and electrolyte solution concentration is yet to be fully understood. In this study, we investigate the impact of electrolyte solution concentration on the electrochemical properties of ionogels to identify the correlation for enhanced performance. Our findings demonstrate a clear relationship between the specific capacitance and ionic conductivity of ionogels, which depends on the availability of mobile ions. The reduced number of ions at low electrolyte solution concentrations leads to decreased ionic conductivity and specific capacitance due to the scarcity of a double layer, constraining charge storage capacity. However, at a 31 vol% electrolyte solution concentration, an le quantity of ions becomes accessible, resulting in increased ionic conductivity and specific capacitance, reaching maximum values of 58 ± 1.48 μS/cm and 45.74 F/g, respectively. Furthermore, the synthesized ionogel demonstrates a wide electrochemical stability of 3.5 V, enabling erse practical applications. This study provides valuable insights into determining the optimal electrolyte solution concentration for enhancing ionogel electrochemical performance for energy applications. It highlights the impact of ion pairs and aggregates on ion mobility within ionogels, subsequently affecting their resultant electrochemical properties.
Publisher: Springer Science and Business Media LLC
Date: 14-10-2022
DOI: 10.1038/S41598-022-21275-4
Abstract: Selenium in wastewater is of particular concern due to its increasing concentration, high mobility in water, and toxicity to organisms therefore, this study was carried out to determine the removal efficiency of selenium using iron and manganese-based bimetallic micro-composite adsorbents. The bimetallic micro-composite adsorbent was synthesized by using the chemical reduction method. Micro-particles were characterized by using energy-dispersive X-ray spectroscopy for elemental analysis after adsorption, which confirms the adsorption of selenium on the surface of the micro-composite adsorbent, scanning electron microscopy, which shows particles are circular in shape and irregular in size, Brunauer–Emmett–Teller which results from the total surface area of particles were 59.345m 2 /g, Zeta particle size, which results from average particles size were 39.8 nm. Then it was applied to remove selenium ions in an aqueous system. The data revealed that the optimum conditions for the highest removal (95.6%) of selenium were observed at pH 8.5, adsorbent dosage of 25 mg, and contact time of 60 min, respectively, with the initial concentration of 1 ppm. The Langmuir and Freundlich isotherm models match the experimental data very well. The results proved that bimetallic micro-composite could be used as an effective selenium adsorbent due to the high adsorption capacity and the short adsorption time needed to achieve equilibrium. Regarding the reusability of bimetallic absorbent, the adsorption and desorption percentages decreased from 50 to 45% and from 56 to 53%, respectively, from the 1st to the 3rd cycle.
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 05-2021
Publisher: Journal of Modern Power Systems and Clean Energy
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 04-2019
DOI: 10.1038/S41598-019-41960-1
Abstract: Polymer composites are fabricated by incorporating fillers into a polymer matrix. The intent for addition of fillers is to improve the physical, mechanical, chemical and rheological properties of the composite. This study reports on a unique polymer composite using hydrochar, synthesised by microwave-assisted hydrothermal carbonization of rice husk, as filler in polylactide matrix. The polylactide/hydrochar composites were fabricated by incorporating hydrochar in polylactide at 5%, 10%, 15% and 20 wt% by melt processing in a Haake rheomix at 170 °C. Both the neat polylactide and polylactide/hydrochar composite were characterized for mechanical, structural, thermal and rheological properties. The tensile modulus of polylactide/hydrochar composites was improved from 2.63 GPa (neat polylactide) to 3.16 GPa, 3.33 GPa, 3.54 GPa, and 4.24 GPa after blending with hydrochar at 5%, 10%, 15%, and 20%, respectively. Further, the incorporation of hydrochar had little effect on storage modulus (G′) and loss modulus (G″). The findings of this study reported that addition of hydrochar improves some characteristics of polylactide composites suggesting the potential of hydrochar as filler for polymer/hydrochar composites.
Publisher: Springer Science and Business Media LLC
Date: 16-04-2018
DOI: 10.1007/S11356-018-1876-7
Abstract: The process parameters of microwave hydrothermal carbonization (MHTC) have significant effect on yield of hydrochar. This study discusses the effect of process parameters on hydrochar yield produced from MHTC of rice husk. Results revealed that, over the ranges tested, a lower temperature, lower reaction time, lower biomass to water ratio, and higher particle size produce more hydrochar. Maximum hydrochar yield of 62.8% was obtained at 1000 W, 220 °C, and 5 min. The higher heating value (HHV) was improved significantly from 6.80 MJ/kg of rice husk to 16.10 MJ/kg of hydrochar. Elemental analysis results showed that the carbon content increased and oxygen content decreased in hydrochar from 25.9 to 47.2% and 68.5 to 47.0%, respectively, improving the energy and combustion properties. SEM analysis exhibited modification in structure of rice husk and improvement in porosity after MHTC, which was further confirmed from BET surface analysis. The BET surface area increased from 25.0656 m
Publisher: Elsevier BV
Date: 06-2022
Publisher: Springer Science and Business Media LLC
Date: 07-11-2019
Publisher: Informa UK Limited
Date: 08-03-2021
Publisher: Wiley
Date: 09-06-2022
DOI: 10.1002/JCTB.7138
Abstract: Deep eutectic solvents (DESs) are new types of tunable solvents that have attracted a large scientific community due to their versatile applications and attractive physical properties. Ammonium‐based solvents are widely used in desulfurization processes, but they are toxic and expensive. Thus, to replace the conventional ammonium‐based solvents, this work aims to synthesize novel ammonium–ethylene glycol (EG)‐based ternary DESs (TDESs). The thermophysical properties, such as viscosity, density, acidity, stability, degradation point, melting point, conductivity, refractivity and miscibility, were measured in this study. The TDESs were prepared using varying molar ratios ranging from 1:3 to 1:5 by combining a hydrogen bond donor (EG) with ZnCl 2 and three ammonium‐based hydrogen bond acceptors, namely ethylammonium chloride, diethylammonium chloride and diethylethanolammonium chloride. It was found that most properties are significantly superior to those of the constituent components of the TDESs. Arrhenius and linear equation fittings with respect to temperatures ranging from 20 to 100 °C predict R 2 values close to unity. The viscosity, pH and density decrease while electrical conductivity increases with increasing temperature. Such interesting observations are mainly caused by the particles’ excitation phenomena that increase their kinetic energy and volume. Furthermore, the lower melting point of TDESs compared to the constituent components is attributed to the charge delocalization through hydrogen bonding between donor and acceptor molecules. © 2022 Society of Chemical Industry (SCI).
Publisher: Elsevier BV
Date: 10-2019
Publisher: Springer Science and Business Media LLC
Date: 14-03-2018
Publisher: Elsevier BV
Date: 12-2020
Publisher: The Electrochemical Society
Date: 09-2023
Abstract: Ionogels are synthesized by confining ionic liquids within a solid olymer matrix. Ionogels have received wide attention owing to their high ionic conductivity and mechanical properties. Recent research has revolved around augmenting the ionic conductivity and mechanical stability of ionogel. Nevertheless, a detailed understanding of the inherent capacitive behavior is indispensable to ensure the application of ionogels in rechargeable lithium-ion batteries, sensors, and supercapacitors. Even though studies on the cyclic voltammetry of ionogels have been previously established, there are limited studies on evaluating the specific capacitance of ionogel, with respect to the amount of electrolyte solution present in the ionogel system. In this study, the ionogel is fabricated through sol-gel route, and the charge storage capacity of ionogel is investigated with varying concentrations of electrolyte solution. Electrochemical methods such as linear sweep voltammetry and cyclic voltammetry are used to characterize the electrochemical performance of ionogel. The most effective concentration of electrolyte solution is determined to be 30 vol% in this study and has attained high electrochemical stability, up to 3.2 V. The ionogel has excellent charge-discharge characteristics, with a specific capacitance of ~18.90 F/g. Meanwhile, the ionogel also exhibits good thermal stability at 358℃.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Bentham Science Publishers Ltd.
Date: 02-05-2018
Publisher: Elsevier BV
Date: 03-2023
Publisher: Springer Science and Business Media LLC
Date: 07-02-2019
Publisher: Elsevier BV
Date: 04-2020
Location: No location found
Location: India
Location: Malaysia
No related grants have been discovered for Mubarak Mujawar.