The fundamental physical constants are at the root of physics theories, but no theoretical framework provides their experimental values. In addition, they are assumed to be independent of each other. Here, we present two valuable dimensionless numbers based on vacuum properties and fundamental constants. The value of these dimensionless numbers provokes questioning, since they are of order 101. In particular, they mean that it is possible to build a velocity and a parameter homogeneous to the Planck constant of the same order as the speed of light and the Planck constant respectively, only based on five well-known physical parameters. These formulas are very unlikely to be two coincidences and suggest that the parameters involved depend on each other. They also seem to indicate that light is a material wave and quantum mechanics is a deterministic theory. A link between these numbers and the fine-structure constant is also established.
{"title":"Three Analytical Relations Giving The Speed of Light, The Planck Constant and The Fine-Structure Constant","authors":"F. Salmon","doi":"10.21315/jps2023.34.1.2","DOIUrl":"https://doi.org/10.21315/jps2023.34.1.2","url":null,"abstract":"The fundamental physical constants are at the root of physics theories, but no theoretical framework provides their experimental values. In addition, they are assumed to be independent of each other. Here, we present two valuable dimensionless numbers based on vacuum properties and fundamental constants. The value of these dimensionless numbers provokes questioning, since they are of order 101. In particular, they mean that it is possible to build a velocity and a parameter homogeneous to the Planck constant of the same order as the speed of light and the Planck constant respectively, only based on five well-known physical parameters. These formulas are very unlikely to be two coincidences and suggest that the parameters involved depend on each other. They also seem to indicate that light is a material wave and quantum mechanics is a deterministic theory. A link between these numbers and the fine-structure constant is also established.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"10 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87287680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. S. Buhari, A. Abdulrahman, S. A. Lawal, A. Abdulkareem, R. A. Muriana, J. Tijani, H. K. Ibrahim, Yusuf Olanrewaju Busari
The storage of petroleum products in buried metal tanks to ensure safety is common practice. However, the integrity of these tanks could be compromised by soil corrosion with economic and environmental consequences. This study examines carbon nanotubes mechanical and anti-corrosive capabilities (CNTs) and epoxy resin coating on steel tanks. The presence of corrosive ions, resistivity, and pH values were all tested in the soil sample. CNT was mixed in proportions of 1.5, 2.5, 3.5 and 4.5 weight percent of epoxy resin to create the coatings. The morphology of uncoated steel, epoxy, and CNTs/ epoxy resin-coated steel specimens was studied using high-resolution scanning electron microscopy (HRSEM) equipment with energy dispersive x-ray spectroscopy (EDX). Electrochemical impedance spectroscopy (EIS) was used for corrosion analysis, and the morphological result was established. The average ions content soil samples showed 272 mg/kg chloride, 467.20 mg/kg sulphate and 167.40 Ω-m for the average resistivity value. The sample’s pH was acidic because it fell within 6.11–7.48. The tensile strength, hardness, and tensile modulus of epoxy resin with CNTs increase with CNTs. The addition of 3.5% CNTs has the best effect on the mechanical strength of the composite. The nanocomposite coatings exhibited considerably superior conductors, according to the EIS investigation. Thus, the hybrid of epoxy and CNTs increases the hydrophobicity of the coated surface.
{"title":"Mechanical and Corrosion Protection Characteristics of CNTs/epoxy resin Nanocomposite Coating on Buried API 5L X65 Steel Storage Tank","authors":"A. S. Buhari, A. Abdulrahman, S. A. Lawal, A. Abdulkareem, R. A. Muriana, J. Tijani, H. K. Ibrahim, Yusuf Olanrewaju Busari","doi":"10.21315/jps2023.34.1.8","DOIUrl":"https://doi.org/10.21315/jps2023.34.1.8","url":null,"abstract":"The storage of petroleum products in buried metal tanks to ensure safety is common practice. However, the integrity of these tanks could be compromised by soil corrosion with economic and environmental consequences. This study examines carbon nanotubes mechanical and anti-corrosive capabilities (CNTs) and epoxy resin coating on steel tanks. The presence of corrosive ions, resistivity, and pH values were all tested in the soil sample. CNT was mixed in proportions of 1.5, 2.5, 3.5 and 4.5 weight percent of epoxy resin to create the coatings. The morphology of uncoated steel, epoxy, and CNTs/ epoxy resin-coated steel specimens was studied using high-resolution scanning electron microscopy (HRSEM) equipment with energy dispersive x-ray spectroscopy (EDX). Electrochemical impedance spectroscopy (EIS) was used for corrosion analysis, and the morphological result was established. The average ions content soil samples showed 272 mg/kg chloride, 467.20 mg/kg sulphate and 167.40 Ω-m for the average resistivity value. The sample’s pH was acidic because it fell within 6.11–7.48. The tensile strength, hardness, and tensile modulus of epoxy resin with CNTs increase with CNTs. The addition of 3.5% CNTs has the best effect on the mechanical strength of the composite. The nanocomposite coatings exhibited considerably superior conductors, according to the EIS investigation. Thus, the hybrid of epoxy and CNTs increases the hydrophobicity of the coated surface.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"62 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84707440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Normawati Jasni, A. Iqbal, N. A. Abu Bakar, W. M. Wan Ahmad Kamil, W. Danial, M. W. Ismail, Kalaivizhi Rajappan
In this study, Li+ ions capped zinc oxide quantum dots (ZnO QDs) was synthesised using the microwave method. The X-ray diffraction (XRD), transmission electron microscopy (TEM), high-transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM), UV–Visible diffuse reflectance spectroscopy (UV-DRS), and photoluminescence (PL) techniques were used to characterise the structural, morphological, optical properties of the ZnO QDs. The XRD analysis reveals that ZnO QDs have a hexagonal wurtzite structure with an average crystallite size of 9.9 nm. The morphology of ZnO QDs was observed to be quasi-spherically shaped with an average particle size of 10 nm. The PL analysis detected the presence of various defects. All these factors enhanced the photodegradation of oxytetracycline (OTC) under fluorescent light irradiation. Within 40 min, 88.3% of OTC was removed, which was higher compared to the bulk ZnO reported in the literature. This technology is aimed at small animal husbandries due to the photocatalyst synthesis method’s simplicity and the photocatalysis process’s requirements.
{"title":"Photodegradation of Oxytetracycline Using Fluorescent Light Driven ZnO Quantum Dots Synthesised Via Microwave Method","authors":"Normawati Jasni, A. Iqbal, N. A. Abu Bakar, W. M. Wan Ahmad Kamil, W. Danial, M. W. Ismail, Kalaivizhi Rajappan","doi":"10.21315/jps2023.34.1.3","DOIUrl":"https://doi.org/10.21315/jps2023.34.1.3","url":null,"abstract":"In this study, Li+ ions capped zinc oxide quantum dots (ZnO QDs) was synthesised using the microwave method. The X-ray diffraction (XRD), transmission electron microscopy (TEM), high-transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM), UV–Visible diffuse reflectance spectroscopy (UV-DRS), and photoluminescence (PL) techniques were used to characterise the structural, morphological, optical properties of the ZnO QDs. The XRD analysis reveals that ZnO QDs have a hexagonal wurtzite structure with an average crystallite size of 9.9 nm. The morphology of ZnO QDs was observed to be quasi-spherically shaped with an average particle size of 10 nm. The PL analysis detected the presence of various defects. All these factors enhanced the photodegradation of oxytetracycline (OTC) under fluorescent light irradiation. Within 40 min, 88.3% of OTC was removed, which was higher compared to the bulk ZnO reported in the literature. This technology is aimed at small animal husbandries due to the photocatalyst synthesis method’s simplicity and the photocatalysis process’s requirements.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"85 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91254532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zinc oxide (ZnO) thin film, an important n-type semiconductor for various applications, needs to be prepared by a simple and low-cost method. Herein, ZnO thin films with various deposition times (1.25 min, 2.50 min, 5.00 min and 7.5 min) have been successfully fabricated by the electroplating method. The X-ray diffraction analysis demonstrates that the crystal structure of all samples was hexagonal, with the largest crystal size of 28.17 nm and a deposition time of 2.50 min. The scanning electron microscopy (SEM) analysis shows that the deposition time increased along with the more visible size distribution of the crystallite grains and the smaller, more spherical and uniform, compact coating of the substrate. It is found that increasing the deposition time from 1.25 min to 7.5 min leads to an increment of thickness from 0.84 µm to 4.4 µm. The elemental analysis reveals the presence of zinc (Zn) and oxygen (O) without impurities. The optical analysis reveals that the ZnO transmittance was greater than 95% for all deposition times. The highest bandgap energy value of the ZnO thin film is 3.24 eV at a deposition time of 1.25 min. With great optical and structural properties, our ZnO thin film has a big potential to be used for dye-sensitised solar cells (DSSC).
{"title":"Electroplated ZnO Thin Film: Influence of Deposition Time on Optical and Structural Properties","authors":"N. Siregar, M. Motlan, M. Sirait","doi":"10.21315/jps2023.34.1.4","DOIUrl":"https://doi.org/10.21315/jps2023.34.1.4","url":null,"abstract":"Zinc oxide (ZnO) thin film, an important n-type semiconductor for various applications, needs to be prepared by a simple and low-cost method. Herein, ZnO thin films with various deposition times (1.25 min, 2.50 min, 5.00 min and 7.5 min) have been successfully fabricated by the electroplating method. The X-ray diffraction analysis demonstrates that the crystal structure of all samples was hexagonal, with the largest crystal size of 28.17 nm and a deposition time of 2.50 min. The scanning electron microscopy (SEM) analysis shows that the deposition time increased along with the more visible size distribution of the crystallite grains and the smaller, more spherical and uniform, compact coating of the substrate. It is found that increasing the deposition time from 1.25 min to 7.5 min leads to an increment of thickness from 0.84 µm to 4.4 µm. The elemental analysis reveals the presence of zinc (Zn) and oxygen (O) without impurities. The optical analysis reveals that the ZnO transmittance was greater than 95% for all deposition times. The highest bandgap energy value of the ZnO thin film is 3.24 eV at a deposition time of 1.25 min. With great optical and structural properties, our ZnO thin film has a big potential to be used for dye-sensitised solar cells (DSSC).","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88711245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Andi Muhammad Afdhal Saputra, Nadea Agustina, A. -, Zurnansyah -, Samnur -, E. H. Sujiono
In this paper, we report the synthesis and physical properties of the graphene oxide (GO) /chitosan (CS) composite membrane, which is effectively synthesised using natural waste. The GO/CS composite membrane analysis results were confirmed using XRD, FTIR and SEM. The XRD results of the GO/CS composite membrane showed that the diffraction peak of chitosan appeared at 2θ = 19.3o and the diffraction peak of GO appeared at 2θ = 26.3o, with the GO peak being dominant, which makes the crystallinity of CS decrease. The FTIR spectrum of the GO/CS membrane showed the disappearance of the CS glucopyranose band and the functional group (C=O) of GO at 891 cm–1 and 1,704 cm–1 and the functional group (C=C) of GO decreased at a wavelength of 1,557 cm–1. The SEM results showed the surface morphology of the GO/CS membrane, where the surface of the GO/CS composite membrane became smooth due to the contact between the hydroxyl and NH groups in CS with oxygen-containing groups in GO. The XRD, FTIR and SEM results showed the physical interaction between GO and CS. They are increasing the value of Young’s modulus, elasticity, elongation at break and absorption of metal ions. The GO/CS composite membranes are expected to have potential applications in metal absorption, biochemistry and electrochemistry.
{"title":"Synthesis and Characterisation of Graphene Oxide/Chitosan Composite Membranes from Natural Waste","authors":"Andi Muhammad Afdhal Saputra, Nadea Agustina, A. -, Zurnansyah -, Samnur -, E. H. Sujiono","doi":"10.21315/jps2022.33.3.5","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.5","url":null,"abstract":"In this paper, we report the synthesis and physical properties of the graphene oxide (GO) /chitosan (CS) composite membrane, which is effectively synthesised using natural waste. The GO/CS composite membrane analysis results were confirmed using XRD, FTIR and SEM. The XRD results of the GO/CS composite membrane showed that the diffraction peak of chitosan appeared at 2θ = 19.3o and the diffraction peak of GO appeared at 2θ = 26.3o, with the GO peak being dominant, which makes the crystallinity of CS decrease. The FTIR spectrum of the GO/CS membrane showed the disappearance of the CS glucopyranose band and the functional group (C=O) of GO at 891 cm–1 and 1,704 cm–1 and the functional group (C=C) of GO decreased at a wavelength of 1,557 cm–1. The SEM results showed the surface morphology of the GO/CS membrane, where the surface of the GO/CS composite membrane became smooth due to the contact between the hydroxyl and NH groups in CS with oxygen-containing groups in GO. The XRD, FTIR and SEM results showed the physical interaction between GO and CS. They are increasing the value of Young’s modulus, elasticity, elongation at break and absorption of metal ions. The GO/CS composite membranes are expected to have potential applications in metal absorption, biochemistry and electrochemistry.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82635942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Considering the importance of statistics related to microfields in the spectral line shapes in plasma, many researchers were interested in calculating statistical distributions related to microfields with different models and approximations. Analytical approaches and numerical simulation methods can be used to study the variations of the magnitude or the directions of the microfield. The aim of this work is the calculation of distributions of microfield angles and distributions of microfield angular velocities on ions in plasmas. The article briefly presents an overview of previous work and the molecular dynamics simulation (MDS) technique used in this work. We consider interaction between all ions of the plasma according to Debye potential, and we follow evolution of the positions and velocities of particles according to Verlet algorithm. The results present effects of temperature and ion densities on calculated distributions. We compare our results with those of an analytical model based on Holtsmark model at the temperature 105 K, the ionic density 2.1015 cm–3 and for Z = +2 and Z = +5. Another comparison is done with independent particles model (IPM) for ionic coupling parameter equal to 0.17. Our values of the most probable angular velocity are less than those of the analytical calculation; differences may be caused mainly by the choice of the interaction potential and interaction between all ions in the plasma.
{"title":"Calculating Microfield Angular Velocity Distribution in Plasma through Using Molecular Dynamics Simulation","authors":"Abdallah Bekkouche, F. Khelfaoui","doi":"10.21315/jps2022.33.3.6","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.6","url":null,"abstract":"Considering the importance of statistics related to microfields in the spectral line shapes in plasma, many researchers were interested in calculating statistical distributions related to microfields with different models and approximations. Analytical approaches and numerical simulation methods can be used to study the variations of the magnitude or the directions of the microfield. The aim of this work is the calculation of distributions of microfield angles and distributions of microfield angular velocities on ions in plasmas. The article briefly presents an overview of previous work and the molecular dynamics simulation (MDS) technique used in this work. We consider interaction between all ions of the plasma according to Debye potential, and we follow evolution of the positions and velocities of particles according to Verlet algorithm. The results present effects of temperature and ion densities on calculated distributions. We compare our results with those of an analytical model based on Holtsmark model at the temperature 105 K, the ionic density 2.1015 cm–3 and for Z = +2 and Z = +5. Another comparison is done with independent particles model (IPM) for ionic coupling parameter equal to 0.17. Our values of the most probable angular velocity are less than those of the analytical calculation; differences may be caused mainly by the choice of the interaction potential and interaction between all ions in the plasma.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"96 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74820931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Rina Ratri, Q. Sabrina, T. Lestariningsih, Salsabila Zakiyyah
Poly (vinyl alcohol) (PVA) composite membrane as separator-cum-electrolyte for li-ion battery was prepared via solution casting method. Hydrophilicity of PVA helped to substitute flammable, toxic solvents with deionised water. Lithium bis(oxalato) borate (LiBOB) electrolyte salt was incorporated in the membrane to form flexible self-standing membrane of composite polymer electrolyte (CPE). To further enhance the ionic conductivity, CPE membrane was immersed in 1M LiBOB salt dissolved in deionised water. Neat PVA membrane would have been dissolved instantly in any solution involving water; introduction of LiBOB electrolyte salt deprived the hydrogen bond which transform it into an insoluble CPE membrane. EIS measurement showed that salt immersion boosted the CPE membrane ionic conductivity by four orders of magnitude, from 4.77×10–7 S/cm to 1.93×10–3 S/cm at room temperature.
{"title":"Performance Enhancement of Poly (Vinyl Alcohol) Composite Polymer Electrolyte for Li-Ion Battery Through Salt Immersion Process","authors":"C. Rina Ratri, Q. Sabrina, T. Lestariningsih, Salsabila Zakiyyah","doi":"10.21315/jps2022.33.3.3","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.3","url":null,"abstract":"Poly (vinyl alcohol) (PVA) composite membrane as separator-cum-electrolyte for li-ion battery was prepared via solution casting method. Hydrophilicity of PVA helped to substitute flammable, toxic solvents with deionised water. Lithium bis(oxalato) borate (LiBOB) electrolyte salt was incorporated in the membrane to form flexible self-standing membrane of composite polymer electrolyte (CPE). To further enhance the ionic conductivity, CPE membrane was immersed in 1M LiBOB salt dissolved in deionised water. Neat PVA membrane would have been dissolved instantly in any solution involving water; introduction of LiBOB electrolyte salt deprived the hydrogen bond which transform it into an insoluble CPE membrane. EIS measurement showed that salt immersion boosted the CPE membrane ionic conductivity by four orders of magnitude, from 4.77×10–7 S/cm to 1.93×10–3 S/cm at room temperature.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"45 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77043775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmad Fuzamy Mohd Abdul Fatah, M. N. Murat, Noorashrina A. Hamid
Lanthanum strontium cobalt ferum (LSCF) with addition of copper oxide (CuO) can serve as an alternate cathode material in Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) due to its strong catalytic activity for oxygen reduction process at intermediate temperatures and great chemical compatibility. This study was done to determine the viability of LSCF–CuO composite as a material for the IT-SOFC cathode. The cathode powder was synthesised using the conventional solid-state process at intermediate temperatures range (600ºC–900ºC). The thermogravimetric analysis demonstrated that when LSCF was calcined at temperatures over 600ºC, the weight loss curve flattened. In the meantime, x-ray diffraction revealed that the perovskite structure of LSCF-CuO was completely formed after calcined at 800ºC. Moreover, the Brunauer– Emmett–Teller (BET) and scanning electron microscope investigations demonstrated that as the calcination temperature rose, the LSCF–CuO particles tended to grow. The electrochemical impedance spectroscopy investigation revealed polarisation resistance of samples calcined at 800ºC (0.41 Ωcm2) was significantly lower than that of samples calcined at 600ºC (29.57 Ωcm2). Judging from chemical, physical and electrochemical properties, it is evidence that LSCF-CuO prepared via simple solid-state reaction has a potential to be used as cathode material for IT-SOFC.
{"title":"Physiochemical and Electrochemical Properties of Lanthanum Strontium Cobalt Ferum–Copper (II) Oxide Prepared via Solid State Reaction","authors":"Ahmad Fuzamy Mohd Abdul Fatah, M. N. Murat, Noorashrina A. Hamid","doi":"10.21315/jps2022.33.3.7","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.7","url":null,"abstract":"Lanthanum strontium cobalt ferum (LSCF) with addition of copper oxide (CuO) can serve as an alternate cathode material in Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) due to its strong catalytic activity for oxygen reduction process at intermediate temperatures and great chemical compatibility. This study was done to determine the viability of LSCF–CuO composite as a material for the IT-SOFC cathode. The cathode powder was synthesised using the conventional solid-state process at intermediate temperatures range (600ºC–900ºC). The thermogravimetric analysis demonstrated that when LSCF was calcined at temperatures over 600ºC, the weight loss curve flattened. In the meantime, x-ray diffraction revealed that the perovskite structure of LSCF-CuO was completely formed after calcined at 800ºC. Moreover, the Brunauer– Emmett–Teller (BET) and scanning electron microscope investigations demonstrated that as the calcination temperature rose, the LSCF–CuO particles tended to grow. The electrochemical impedance spectroscopy investigation revealed polarisation resistance of samples calcined at 800ºC (0.41 Ωcm2) was significantly lower than that of samples calcined at 600ºC (29.57 Ωcm2). Judging from chemical, physical and electrochemical properties, it is evidence that LSCF-CuO prepared via simple solid-state reaction has a potential to be used as cathode material for IT-SOFC.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"29 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73848138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This manuscript reports the fabrication of polyethersulfone (PES)/polydimethylsiloxane (PDMS)/zeolitic imidazolate framework (ZIF-L) composite membrane for gas separation. ZIF-L is a new type of nanosheet metal-organic frameworks that can selectively separate CO2. Hypothetically, its presence in the selective layer will simultaneously improve CO2 permeance and selectivity. The effect of four parameters (PDMS concentration, withdrawal speed, holding time and ZIF-L:PDMS ratio) involved during the fabrication process on the separation performance were thoroughly looked at. Except for ZIF-L:PDMS ratio, it was found that, all parameters have a significant influence on both, the thickness of selective layer and amount of ZIF-L present. ZIF-L:PDMS ratio has substantial impact on the ZIF-L adhered on the support. The ideal fabrication condition was 3 wt% PDMS concentration, 5 mm/s withdrawal speed, 120s holding time and 1:1 ZIF-L:PDMS ratio. At these conditions, the composite membrane recorded 4.25 GPU, 15.71 GPU and 8.93 GPU of CO2 permeance, CO2/N2 and CO2/CH4 selectivity, respectively.
{"title":"Fabrication of PES/PDMS/ZIF-L Composite Membrane for CO2, N2 and CH4 Permeation","authors":"M. S. Shah Buddin, A. Ahmad","doi":"10.21315/jps2022.33.3.2","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.2","url":null,"abstract":"This manuscript reports the fabrication of polyethersulfone (PES)/polydimethylsiloxane (PDMS)/zeolitic imidazolate framework (ZIF-L) composite membrane for gas separation. ZIF-L is a new type of nanosheet metal-organic frameworks that can selectively separate CO2. Hypothetically, its presence in the selective layer will simultaneously improve CO2 permeance and selectivity. The effect of four parameters (PDMS concentration, withdrawal speed, holding time and ZIF-L:PDMS ratio) involved during the fabrication process on the separation performance were thoroughly looked at. Except for ZIF-L:PDMS ratio, it was found that, all parameters have a significant influence on both, the thickness of selective layer and amount of ZIF-L present. ZIF-L:PDMS ratio has substantial impact on the ZIF-L adhered on the support. The ideal fabrication condition was 3 wt% PDMS concentration, 5 mm/s withdrawal speed, 120s holding time and 1:1 ZIF-L:PDMS ratio. At these conditions, the composite membrane recorded 4.25 GPU, 15.71 GPU and 8.93 GPU of CO2 permeance, CO2/N2 and CO2/CH4 selectivity, respectively.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78547697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Marjunus, Yusril Al Fath, Y. Yulianti, W. Widanarto
Chemical reactions simulation in detecting hydrogen gas (H2) on Pt80Au14Ti6 sensor surface based on work function change (Δɸ) has been conducted. The simulation result is compared with laboratory results of detecting H2 gas. Three chemical reactions contained three coverages, H coverage (θH), O coverage (θO), and H2O coverage (θH2O). The simulation was run using MATLAB. This research can find the reaction parameter values such as the Arrhenius coefficient of H2O forming reaction on Pt (υf3Pt), H2O forming reaction on Au (υf3Au), i.e., H2O dissociation on Au (υf3Au ), O2 desorption on Ti (υd2Ti), H2O forming reaction on Ti (υf3Ti), and H2O dissociation on Ti (υf3Ti), i.e., 7.5×1014 s–1, 9.85×1015 s–1, 3.25×1015 s–1, 7.11×1015 s–1, 3.425×1015 s–1 and 2.725×1015 s–1, respectively. The simulation results also have the same trend as the laboratory results. However, the contact potential difference (CPD) simulation result, i.e., –240 mV, is not the same as the laboratory result, (–297± 9) mV. In addition, this simulation also obtained approximation coverage for atoms/molecules on PT80Au14Ti6 surface, i.e., θH = 0.665154 Mono Layer (ML); θO = 1.5621× 10–6 ML; and θH2O = 5.41676 ×10–5 ML.
{"title":"Simulation of Pt80Au14Ti6 Work Function Change-Based Sensor of H2 Gas","authors":"R. Marjunus, Yusril Al Fath, Y. Yulianti, W. Widanarto","doi":"10.21315/jps2022.33.3.4","DOIUrl":"https://doi.org/10.21315/jps2022.33.3.4","url":null,"abstract":"Chemical reactions simulation in detecting hydrogen gas (H2) on Pt80Au14Ti6 sensor surface based on work function change (Δɸ) has been conducted. The simulation result is compared with laboratory results of detecting H2 gas. Three chemical reactions contained three coverages, H coverage (θH), O coverage (θO), and H2O coverage (θH2O). The simulation was run using MATLAB. This research can find the reaction parameter values such as the Arrhenius coefficient of H2O forming reaction on Pt (υf3Pt), H2O forming reaction on Au (υf3Au), i.e., H2O dissociation on Au (υf3Au ), O2 desorption on Ti (υd2Ti), H2O forming reaction on Ti (υf3Ti), and H2O dissociation on Ti (υf3Ti), i.e., 7.5×1014 s–1, 9.85×1015 s–1, 3.25×1015 s–1, 7.11×1015 s–1, 3.425×1015 s–1 and 2.725×1015 s–1, respectively. The simulation results also have the same trend as the laboratory results. However, the contact potential difference (CPD) simulation result, i.e., –240 mV, is not the same as the laboratory result, (–297± 9) mV. In addition, this simulation also obtained approximation coverage for atoms/molecules on PT80Au14Ti6 surface, i.e., θH = 0.665154 Mono Layer (ML); θO = 1.5621× 10–6 ML; and θH2O = 5.41676 ×10–5 ML.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"27 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72510220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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