The structural thick plates were manufactured by varying the vacuum time at a constant argon gas flow rate and degree of vacuum during the Ruhrstahl Heraeus (RH) refining process. The inclusion and mechanical properties of the structural thick-plate specimens were evaluated according to vacuum time. The nitrogen in the converter had an effect after the RH process, and as the vacuum time of the RH process increased, the nitrogen content also increased. The nitrogen in the continuous casting (CC) decreased more than that in the converter, and as the vacuum time increased, the hydrogen decreased. Al2O3·CaO, MnS and Al2O3·MgO inclusions were observed in the structural thick plate. The average size of the oxides was (6.1 to 33.46) μm, while the average size of the Al-O-based inclusions was (4.26 - 6.3) μm. The mechanical properties, such as tensile strength, yield strength, and elongation, were affected by the vacuum time of the RH process with 10 min being the best. The micro-Vickers hardness showed dispersion regardless of the vacuum time of the RH process, which can be explained by the Weibull probability distribution. From the shape and scale parameters, although the specimen with the vacuum time of the RH process of 10 min showed a large dispersion in the micro-Vickers hardness, the characteristic value of 63.2 % was the best.
{"title":"Mechanical Characteristics of Structural Thick Plates Depending on Vacuum Time of RH Process","authors":"Ki Hang Shin, Byoung-Chul Choi, K. Nam","doi":"10.4028/p-s6gL9t","DOIUrl":"https://doi.org/10.4028/p-s6gL9t","url":null,"abstract":"The structural thick plates were manufactured by varying the vacuum time at a constant argon gas flow rate and degree of vacuum during the Ruhrstahl Heraeus (RH) refining process. The inclusion and mechanical properties of the structural thick-plate specimens were evaluated according to vacuum time. The nitrogen in the converter had an effect after the RH process, and as the vacuum time of the RH process increased, the nitrogen content also increased. The nitrogen in the continuous casting (CC) decreased more than that in the converter, and as the vacuum time increased, the hydrogen decreased. Al2O3·CaO, MnS and Al2O3·MgO inclusions were observed in the structural thick plate. The average size of the oxides was (6.1 to 33.46) μm, while the average size of the Al-O-based inclusions was (4.26 - 6.3) μm. The mechanical properties, such as tensile strength, yield strength, and elongation, were affected by the vacuum time of the RH process with 10 min being the best. The micro-Vickers hardness showed dispersion regardless of the vacuum time of the RH process, which can be explained by the Weibull probability distribution. From the shape and scale parameters, although the specimen with the vacuum time of the RH process of 10 min showed a large dispersion in the micro-Vickers hardness, the characteristic value of 63.2 % was the best.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"132 1","pages":"45 - 55"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86066599","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}
The key drivers of the growing interest in the recovery of local materials, particularly land and waste plants, are low-cost building materials, thermal comfort, decreased energy consumption, and decreased carbon dioxide polluting emissions. This work's primary objective is to test a bio-sourced composite material that takes the form of a block of unfinished soil that has been stabilized with cement and blended with wheat straw. This study is being done with the objective of examining the impact of this fiber at different weight percentages (0, 2, 3%, and 4%) on the mechanical behavior, durability, and thermophysical properties of the produced blocks. The results obtained indicated an increase in thermal conductivity, from 2.75 W/mK for the blocks without wheat straw fiber to 0.398 W/mK for those getting 4% of the wheat straw fiber, signifying an improvement in thermal insulation. While retaining the low performance threshold required by the earth construction standard, this improvement was accompanied by an average decrease in mechanical performance.
{"title":"Durability of Raw Earth Blocks Reinforced with Wheat Straw Fibers","authors":"M. Messis, N. Bouhamou, Abdelatif Benaisa","doi":"10.4028/p-b0MEu9","DOIUrl":"https://doi.org/10.4028/p-b0MEu9","url":null,"abstract":"The key drivers of the growing interest in the recovery of local materials, particularly land and waste plants, are low-cost building materials, thermal comfort, decreased energy consumption, and decreased carbon dioxide polluting emissions. This work's primary objective is to test a bio-sourced composite material that takes the form of a block of unfinished soil that has been stabilized with cement and blended with wheat straw. This study is being done with the objective of examining the impact of this fiber at different weight percentages (0, 2, 3%, and 4%) on the mechanical behavior, durability, and thermophysical properties of the produced blocks. The results obtained indicated an increase in thermal conductivity, from 2.75 W/mK for the blocks without wheat straw fiber to 0.398 W/mK for those getting 4% of the wheat straw fiber, signifying an improvement in thermal insulation. While retaining the low performance threshold required by the earth construction standard, this improvement was accompanied by an average decrease in mechanical performance.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"46 1","pages":"131 - 148"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85155525","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}
Globally, manufacturing industries are generating a large volume of solid waste during their processes. These wastes, when spread through soil/water affect public health. This work focuses on the use of solid industrial waste from herbal medicine and TiO2 manufacturing industries to produce iron oxide incorporated biochar, which can be served as adsorbent and low cost catalyst for many reactions. Biochar was produced by the slow pyrolysis of waste collected from herbal manufacturing units using tubular furnace at 550°C at a heating rate of 5°C/min. The iron oxide waste collected from Kerala Minerals and Metals Limited, Kerala, India (KMML), was incorporated into the produced biochar by using planetary ball mill apparatus. Structural and elemental analysis of produced biochar and Fe2O3 incorporated biochar was conducted using XRD, SEM and SEM-EDS, BET surface area analysis, ICP-OES, and CHNS analysis. The H/C ratio of prepared biochar shows it has a rectangular layered structure of 50*50 aromatic cluster size. The changes in bonds and groups before and after metal incorporation were studied using FTIR spectroscopic analysis and temperature stability of prepared samples were analyzed using TGA. The molecular structure of produced biochar and changes in their bond length was studied and optimized employing Avogadro and Chemcraft software. The BET analysis shows the surface area of biochar become increased after the metallic incorporation. The same results were concluded from the molecular modelling data obtained from Chemcraft software. These results proved that the biochar surface area and pore volume can be increased by incorporation of iron oxide from industrial waste.
{"title":"Molecular Modelling and Characterization of Metal Incorporated Biochar from Industrial Wastes","authors":"Ansab N.P, R. Ranjana, R. Anjana, A. Kalam","doi":"10.4028/p-MWP6mr","DOIUrl":"https://doi.org/10.4028/p-MWP6mr","url":null,"abstract":"Globally, manufacturing industries are generating a large volume of solid waste during their processes. These wastes, when spread through soil/water affect public health. This work focuses on the use of solid industrial waste from herbal medicine and TiO2 manufacturing industries to produce iron oxide incorporated biochar, which can be served as adsorbent and low cost catalyst for many reactions. Biochar was produced by the slow pyrolysis of waste collected from herbal manufacturing units using tubular furnace at 550°C at a heating rate of 5°C/min. The iron oxide waste collected from Kerala Minerals and Metals Limited, Kerala, India (KMML), was incorporated into the produced biochar by using planetary ball mill apparatus. Structural and elemental analysis of produced biochar and Fe2O3 incorporated biochar was conducted using XRD, SEM and SEM-EDS, BET surface area analysis, ICP-OES, and CHNS analysis. The H/C ratio of prepared biochar shows it has a rectangular layered structure of 50*50 aromatic cluster size. The changes in bonds and groups before and after metal incorporation were studied using FTIR spectroscopic analysis and temperature stability of prepared samples were analyzed using TGA. The molecular structure of produced biochar and changes in their bond length was studied and optimized employing Avogadro and Chemcraft software. The BET analysis shows the surface area of biochar become increased after the metallic incorporation. The same results were concluded from the molecular modelling data obtained from Chemcraft software. These results proved that the biochar surface area and pore volume can be increased by incorporation of iron oxide from industrial waste.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"42 1","pages":"171 - 184"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86703685","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 investigation inspects the concurrent influence of steel fibers with different materials such as Fly Ash(FA), Silica Fume(SF) and aggregates on the mechanical behaviour of geopolymer concrete (GPC) mixes. A range of 8 to 16 molar NaOH molarities variation was observed in the experimental work. Sodium hydroxide molar (NaOH) and sodium silicate solution (NaOH) were utilised as alkaline activators in proportions of 1, 1.5, and 2 (Na2SiO3/NaOH). Steel crimped fibers having aspect ratio of 60 were added in the geopolymer concrete. Geopolymer concrete properties considering type of fly ash, the quantity of fly ash, silica fume, the content of fine aggregate and coarse aggregate, effect of sodium hydroxide concentration, content of sodium silicate solution and inclusion of 0.2% of steel fibers in the geopolymer concrete are analyzed.
{"title":"Mechanical Behaviour of Geopolymer Concrete Using Steel Fibers","authors":"Dhanalakshmi Ayyanar, Shahul Hameed Masthan Ali, Priyanka Kaliraj, Velci Shridevi Paulraj, Kumar Rajendrakani","doi":"10.4028/p-iTP8HE","DOIUrl":"https://doi.org/10.4028/p-iTP8HE","url":null,"abstract":"This investigation inspects the concurrent influence of steel fibers with different materials such as Fly Ash(FA), Silica Fume(SF) and aggregates on the mechanical behaviour of geopolymer concrete (GPC) mixes. A range of 8 to 16 molar NaOH molarities variation was observed in the experimental work. Sodium hydroxide molar (NaOH) and sodium silicate solution (NaOH) were utilised as alkaline activators in proportions of 1, 1.5, and 2 (Na2SiO3/NaOH). Steel crimped fibers having aspect ratio of 60 were added in the geopolymer concrete. Geopolymer concrete properties considering type of fly ash, the quantity of fly ash, silica fume, the content of fine aggregate and coarse aggregate, effect of sodium hydroxide concentration, content of sodium silicate solution and inclusion of 0.2% of steel fibers in the geopolymer concrete are analyzed.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"80 1","pages":"159 - 168"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80446103","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}
Jia Nong Zhou, Zhi Qi Liu, Dongliang Chen, N. Lin, Huanjie Wang
Studies have shown that surface texture can improve lubrication state and reduce friction and wear. The cold pressing process of micro-units can prepare surface textures at low cost, in large quantities, and with high efficiency, but the micro-pillar array mold required for the cold pressing process is difficult to prepare. In this study, the influence of mask electrochemical processing parameters on the height and height uniformity of the micropillar array was studied by orthogonal experiment on the 42CrMo alloy steel. Four main factors are designed in the orthogonal experiment, namely voltage, duty cycle, frequency, and mask spacing, and each factor is set to three levels. The results of the range analysis show that: voltage and duty cycle are positively correlated with the height of the microcolumn, but negatively correlated with uniformity, and when the duty cycle is 50%, the uniformity of the microcolumn decreases sharply; The height and uniformity of the microcolumns increase with the increase of mask spacing. The height of the microcolumn is positively correlated with the frequency, and the uniformity of the microcolumn first increases and then decreases with the increase of frequency. Therefore, in order to meet the height and uniformity requirements at the same time, the grey correlation analysis method was used to obtain the optimal processing parameters: 35 V (voltage), 30% (duty cycle), 300 um (spacing), and 5 kHz (frequency). The average height of the microcolumns prepared by this parameter is 57.632 um and the microcolumn has excellent high uniformity.
{"title":"Fabrication of Microcolumn Arrays Using Through-Mask Electrochemical Micromachining on the 42CrMo Alloy Steel","authors":"Jia Nong Zhou, Zhi Qi Liu, Dongliang Chen, N. Lin, Huanjie Wang","doi":"10.4028/p-t6Szel","DOIUrl":"https://doi.org/10.4028/p-t6Szel","url":null,"abstract":"Studies have shown that surface texture can improve lubrication state and reduce friction and wear. The cold pressing process of micro-units can prepare surface textures at low cost, in large quantities, and with high efficiency, but the micro-pillar array mold required for the cold pressing process is difficult to prepare. In this study, the influence of mask electrochemical processing parameters on the height and height uniformity of the micropillar array was studied by orthogonal experiment on the 42CrMo alloy steel. Four main factors are designed in the orthogonal experiment, namely voltage, duty cycle, frequency, and mask spacing, and each factor is set to three levels. The results of the range analysis show that: voltage and duty cycle are positively correlated with the height of the microcolumn, but negatively correlated with uniformity, and when the duty cycle is 50%, the uniformity of the microcolumn decreases sharply; The height and uniformity of the microcolumns increase with the increase of mask spacing. The height of the microcolumn is positively correlated with the frequency, and the uniformity of the microcolumn first increases and then decreases with the increase of frequency. Therefore, in order to meet the height and uniformity requirements at the same time, the grey correlation analysis method was used to obtain the optimal processing parameters: 35 V (voltage), 30% (duty cycle), 300 um (spacing), and 5 kHz (frequency). The average height of the microcolumns prepared by this parameter is 57.632 um and the microcolumn has excellent high uniformity.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"47 1","pages":"73 - 86"},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84357979","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}
The present work aims to understand the effect of drilling parameters (drill speed and feed rate) during the drilling of saffil fiber-reinforced Al metal matrix composite (MMC) under dry conditions. The effect of drilling parameters on individual response characteristics is evaluated and the optimum drilling parameters are also investigated using a multi-response optimization technique known as Entropy Weighted Grey Relational Analysis (EWGRA). The drilling parameter optimization has been performed with aim of minimizing the surface roughness of drilled hole, roundness error in drilled hole and feed force during drilling. Weights were assigned to individual responses with the Entropy weight method and Grey relational grades were calculated to obtain the optimal level for drilling parameters. To achieve the minimum values for all output responses the optimal value of drill speed is 22 m/min and the feed rate is 0.075 mm/rev.
{"title":"Multi-Response Optimization of Drilling Parameters for Aluminum Metal Matrix Composite Using Entropy Weighted Grey Relational Analysis","authors":"S. Ghalme, P. Karolczak","doi":"10.4028/p-x06fxz","DOIUrl":"https://doi.org/10.4028/p-x06fxz","url":null,"abstract":"The present work aims to understand the effect of drilling parameters (drill speed and feed rate) during the drilling of saffil fiber-reinforced Al metal matrix composite (MMC) under dry conditions. The effect of drilling parameters on individual response characteristics is evaluated and the optimum drilling parameters are also investigated using a multi-response optimization technique known as Entropy Weighted Grey Relational Analysis (EWGRA). The drilling parameter optimization has been performed with aim of minimizing the surface roughness of drilled hole, roundness error in drilled hole and feed force during drilling. Weights were assigned to individual responses with the Entropy weight method and Grey relational grades were calculated to obtain the optimal level for drilling parameters. To achieve the minimum values for all output responses the optimal value of drill speed is 22 m/min and the feed rate is 0.075 mm/rev.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"10 1","pages":"17 - 29"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78380797","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}
G. Bagihalli, Nidhi Manhas, B. Yallur, S. Batakurki
Present study reports the enhanced photoluminescence properties of Ti incorporated Zr networked 4-{formyl (Hydroxymethylidine)-4-Sulfanyl] Benzoic Acid. The as-synthesized metal organic framework (MOF) was synthesized by solvothermal process and was analyzed by SEM (scanning electron microscopy), XRD (X-ray diffraction spectroscopy) and photoluminescence spectroscopy. The as-synthesized MOFs are well crystalline with average particle size of 35 to 56 nm. From XRD data X-ray diffraction patterns which illustrated the well maintained topological structure during the cation exchange process. From scanning electron microscopy study it shows irregular shape of MOFs.
{"title":"Design, Enhanced Photoluminescence Properties of Ti Incorporated Zr-Networked 4-[Formyl (Hydroxymethylidene)-4-Sulfanyl] Benzoic Acid Metal Organic Frameworks","authors":"G. Bagihalli, Nidhi Manhas, B. Yallur, S. Batakurki","doi":"10.4028/p-9z8fn0","DOIUrl":"https://doi.org/10.4028/p-9z8fn0","url":null,"abstract":"Present study reports the enhanced photoluminescence properties of Ti incorporated Zr networked 4-{formyl (Hydroxymethylidine)-4-Sulfanyl] Benzoic Acid. The as-synthesized metal organic framework (MOF) was synthesized by solvothermal process and was analyzed by SEM (scanning electron microscopy), XRD (X-ray diffraction spectroscopy) and photoluminescence spectroscopy. The as-synthesized MOFs are well crystalline with average particle size of 35 to 56 nm. From XRD data X-ray diffraction patterns which illustrated the well maintained topological structure during the cation exchange process. From scanning electron microscopy study it shows irregular shape of MOFs.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"62 1","pages":"77 - 85"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90246905","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}
The transporting of sediments across watershed systems and their placement in reservoirs causes expensive issues for the operators of dams in many different nations throughout the world. In addition to the reservoir's functional capacity steadily decreasing as sediment settles in it, silt removal is a sensitive and challenging process that frequently necessitates taking the reservoir out of service, which is practically unachievable in dry and semi-arid regions. De-silting by hydraulic dredging has recently become a necessity to increase their longevity. But during this operation there are load loss exists so it is necessary to find solutions to reduce it. The present paper revealed that use the Sodium Tripolyphosphate as a reducing agent of the friction factor during the hydraulic dredging of dams. To carry out this study, a rheumatic characterization of dams sediments and dams sediments -sodium tripolyphosphate mixtures was carried out using a torque controlled rheometer (Discovery Hybrid Rheometer DHR2 from TA instrument). The flow curves as a function of dose of sodium tripolyphosphate added to dam sediments were analysed by the modified Cross model. It is clearly shown, in this work, when the quantity of sodium tripolyphosphate is less than of 0.4 % causes a decrease in the yield stress, the zero shear rate viscosity (lower Newtonian plateau) and the infinite shear rate viscosity (upper Newtonian plateau). However, when dose of sodium tripolyphosphate is greater than the critical dose, the the yield stress, the zero shear rate viscosity (lower Newtonian plateau) and the infinite shear rate viscosity (upper Newtonian plateau) are increased. As a result, this study find that the increase on thixotropic behavior of dams sediments is occurred by the addition of sodium tripolyphosphate in a concentration ranging between 0.2 wt% and 0.8 wt% to 40 wt% and 45 wt% of dams sediments. The study also demonstrated that adding of 0.4 wt% of sodium tripolyphosphate to 40 wt% and 45 wt% dam sediments decreased the friction factor by 96% and 25% respectively.
{"title":"Impact of Sodium Tripolyphosphate on the Rheological Properties of Dams Sediments and Friction Factor during Hydraulic Dredging of Dams","authors":"Brahim Lakhache, L. Hammadi, L. Gaidi","doi":"10.4028/p-5r18f6","DOIUrl":"https://doi.org/10.4028/p-5r18f6","url":null,"abstract":"The transporting of sediments across watershed systems and their placement in reservoirs causes expensive issues for the operators of dams in many different nations throughout the world. In addition to the reservoir's functional capacity steadily decreasing as sediment settles in it, silt removal is a sensitive and challenging process that frequently necessitates taking the reservoir out of service, which is practically unachievable in dry and semi-arid regions. De-silting by hydraulic dredging has recently become a necessity to increase their longevity. But during this operation there are load loss exists so it is necessary to find solutions to reduce it. The present paper revealed that use the Sodium Tripolyphosphate as a reducing agent of the friction factor during the hydraulic dredging of dams. To carry out this study, a rheumatic characterization of dams sediments and dams sediments -sodium tripolyphosphate mixtures was carried out using a torque controlled rheometer (Discovery Hybrid Rheometer DHR2 from TA instrument). The flow curves as a function of dose of sodium tripolyphosphate added to dam sediments were analysed by the modified Cross model. It is clearly shown, in this work, when the quantity of sodium tripolyphosphate is less than of 0.4 % causes a decrease in the yield stress, the zero shear rate viscosity (lower Newtonian plateau) and the infinite shear rate viscosity (upper Newtonian plateau). However, when dose of sodium tripolyphosphate is greater than the critical dose, the the yield stress, the zero shear rate viscosity (lower Newtonian plateau) and the infinite shear rate viscosity (upper Newtonian plateau) are increased. As a result, this study find that the increase on thixotropic behavior of dams sediments is occurred by the addition of sodium tripolyphosphate in a concentration ranging between 0.2 wt% and 0.8 wt% to 40 wt% and 45 wt% of dams sediments. The study also demonstrated that adding of 0.4 wt% of sodium tripolyphosphate to 40 wt% and 45 wt% dam sediments decreased the friction factor by 96% and 25% respectively.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"15 1","pages":"111 - 120"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85332128","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}
K2Gd0.97Zr (PO4)3:3mol% Eu3+ were prepared by the solid-state diffusion method and under a vacuum ultra-violet (VUV) region, photoluminescence properties of the phosphor were examined. The phenomenon of visible quantum harvesting via DC was observed in synthesized phosphor for the Gd3+–Eu3+ pair. In the process of quantum harvesting, the two visible light photons are emitted per absorbed VUV photon. This phenomenon occurred upon the 190 nm excitation of Gd3+ at the 6GJ level through a two-step energy transfer from Gd3+ to Eu3+ by cross-relaxation and sequential transfer of the remaining excitation energy. The consequences are that the quantum efficiency of the K2Gd0.97Zr (PO4)3:3mol% Eu3+ phosphor in the energy transfer process from Gd3+ to Eu3+ could reach 233%. The quantum efficiency goes to more than 200% (i.e., 233%) at just low concentration Eu3+ ions (i.e. 3% only). This novelty was found in the prepared phosphor. Therefore, the phosphor K2Gd0.97Zr (PO4)3:3mol% Eu3+ was a potential quantum harvester and potential candidate for mercury free fluorescent lamp and plasma display panel.
{"title":"Synthesis and VUV Spectral Properties of Red-Emitting K2Gd0.97Zr (PO4)3:3mol%Eu3+ Phosphor via Down-Conversion","authors":"S. R. Jaiswal, P. A. Nagpure, S. Omanwar","doi":"10.4028/p-8uuvsd","DOIUrl":"https://doi.org/10.4028/p-8uuvsd","url":null,"abstract":"K2Gd0.97Zr (PO4)3:3mol% Eu3+ were prepared by the solid-state diffusion method and under a vacuum ultra-violet (VUV) region, photoluminescence properties of the phosphor were examined. The phenomenon of visible quantum harvesting via DC was observed in synthesized phosphor for the Gd3+–Eu3+ pair. In the process of quantum harvesting, the two visible light photons are emitted per absorbed VUV photon. This phenomenon occurred upon the 190 nm excitation of Gd3+ at the 6GJ level through a two-step energy transfer from Gd3+ to Eu3+ by cross-relaxation and sequential transfer of the remaining excitation energy. The consequences are that the quantum efficiency of the K2Gd0.97Zr (PO4)3:3mol% Eu3+ phosphor in the energy transfer process from Gd3+ to Eu3+ could reach 233%. The quantum efficiency goes to more than 200% (i.e., 233%) at just low concentration Eu3+ ions (i.e. 3% only). This novelty was found in the prepared phosphor. Therefore, the phosphor K2Gd0.97Zr (PO4)3:3mol% Eu3+ was a potential quantum harvester and potential candidate for mercury free fluorescent lamp and plasma display panel.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"1 1","pages":"101 - 108"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88559959","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}
Metal organic frameworks (MOFs) are three dimensionally arranged compounds of bridged organic ligands coordinately bonded with inorganic cluster. The large surface area with large pore volume of MOFs introduces wide application in catalysis field. With accurate combination of organic and inorganic bridging units we can alter the chemical, thermal stability as well as its porosity. Luminescence is the one of the most important properties exhibited by Metal organic frameworks (MOFs). This luminescent property of MOFs is highly sensitive for guest interaction due to which they are used in the detection of various toxic substances, organic pollutants. Based on their high sensitivity and selectivity they are applied in the field of sensors, different environmental applications, various clean energies, optoelectronic devices, medical and biological applications.
{"title":"A Short Review on Photoluminescent Properties of Hybrid Metal Organic Framework","authors":"Nilophar M. Shaikh, G. Bagihalli, V. Adimule","doi":"10.4028/p-6g8lik","DOIUrl":"https://doi.org/10.4028/p-6g8lik","url":null,"abstract":"Metal organic frameworks (MOFs) are three dimensionally arranged compounds of bridged organic ligands coordinately bonded with inorganic cluster. The large surface area with large pore volume of MOFs introduces wide application in catalysis field. With accurate combination of organic and inorganic bridging units we can alter the chemical, thermal stability as well as its porosity. Luminescence is the one of the most important properties exhibited by Metal organic frameworks (MOFs). This luminescent property of MOFs is highly sensitive for guest interaction due to which they are used in the detection of various toxic substances, organic pollutants. Based on their high sensitivity and selectivity they are applied in the field of sensors, different environmental applications, various clean energies, optoelectronic devices, medical and biological applications.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"111 1","pages":"47 - 56"},"PeriodicalIF":0.0,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79284072","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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