In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the less compact particle. On the contrary, the micro hardness of the other phases showed a gradual rise with the rise in Mg2Si concentration. The higher values of Quality Index, % elongation, ultimate tensile strength and toughness are achieved in the samples where the Mg2Si concentration is nearer to the pseudo-eutectic (13.9 wt. %) region. The yield strength, firstly shows a rising trend up to 25 wt. % Mg2Si and then decreases at 30 wt. % Mg2Si concentration.In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the ...
{"title":"Microstructure evolution and mechanical properties of in situ hypereutectic Al-Mg2Si composites","authors":"R. Bhandari, M. Mallik, M. Mondal","doi":"10.1063/1.5130355","DOIUrl":"https://doi.org/10.1063/1.5130355","url":null,"abstract":"In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the less compact particle. On the contrary, the micro hardness of the other phases showed a gradual rise with the rise in Mg2Si concentration. The higher values of Quality Index, % elongation, ultimate tensile strength and toughness are achieved in the samples where the Mg2Si concentration is nearer to the pseudo-eutectic (13.9 wt. %) region. The yield strength, firstly shows a rising trend up to 25 wt. % Mg2Si and then decreases at 30 wt. % Mg2Si concentration.In this investigation, the hypereutectic in-situ Al-X wt. %Mg2Si (X=15, 20, 25 and 30) composites have been developed through gravity casting technique with the use of commercially pure Al, Si and Mg metals. This composite comprises of three phases, namely the primary Mg2Si phase, which is formed during the pseudo-eutectic transformation at the time of solidification engulfed by the matrix (α-Al) and the binary eutectic (Al-Mg2Si) phase. Microstructure evaluation and the mechanical properties of these composites has been investigated. It is observed that the change Mg2Si concentration has a great impression not only on the morphology and volume fraction but also in the hardness of all the phases that exist. The size and volume percentage of Mg2Si particle increases with the increase in Mg2Si concentration. Bulk hardness also increases with higher Mg2Si concentration. The micro hardness of the reinforcement (primary Mg2Si) particle decreased slightly with the increase in the Mg2Si concentration due to the ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74675130","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 recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano agglomerates in all the cases. Photoluminescence analyses of the samples were also carried out to identify the trap levels in the samples. The photocatalytic activities of the samples were performed under U-V irradiation with the probe pollutant methylene blue. All the three samples showed good photocatalytic performance compared to the commercial photocatalyst Degussa P25. The titania sample synthesized using ethanol solvent showed superior photocatalytic activity compared to other samples. The superior photocatalytic performance of the ethanol based titania sample maybe attributed to the efficient separation of the charge carrier at the anatase-rutile nano heterojunction of the mixed phase titania along with high surface area. This study reveals that the nature of the solvent for the sol gel synthesis have a substantial influence in the physico-chemical and photocatalytic performance of titania.The recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano aggl...
{"title":"Role of alcohol solvents on physico-chemical characteristics and photocatalytic performance of titania","authors":"S. Nikhil, G. Ranjith","doi":"10.1063/1.5130302","DOIUrl":"https://doi.org/10.1063/1.5130302","url":null,"abstract":"The recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano agglomerates in all the cases. Photoluminescence analyses of the samples were also carried out to identify the trap levels in the samples. The photocatalytic activities of the samples were performed under U-V irradiation with the probe pollutant methylene blue. All the three samples showed good photocatalytic performance compared to the commercial photocatalyst Degussa P25. The titania sample synthesized using ethanol solvent showed superior photocatalytic activity compared to other samples. The superior photocatalytic performance of the ethanol based titania sample maybe attributed to the efficient separation of the charge carrier at the anatase-rutile nano heterojunction of the mixed phase titania along with high surface area. This study reveals that the nature of the solvent for the sol gel synthesis have a substantial influence in the physico-chemical and photocatalytic performance of titania.The recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano aggl...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74428828","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}
S. Sarkar, S. Chowdhury, R. Raghunathan, R. Choudhary, D. Phase
Oriented thin films have been prepared using pulsed laser deposition technique on Si (001) and SrTiO3 (STO) (001) substrates. The surface morphologies of films grown on Si substrates are more uniform than STO substrate. Physical properties of BaBiO3 thin films have been studied using Raman and x-ray photoelectron spectroscopic (XPS) techniques. Room temperature Raman spectroscopy confirms the presence of charge-ordering both in bulk and thin films. Our XPS results however show that the charge-disproportionation of Bi oxidation state (4-δ) and (4+δ) with δ<1 in bulk has been modified in thin films to δ=1.Oriented thin films have been prepared using pulsed laser deposition technique on Si (001) and SrTiO3 (STO) (001) substrates. The surface morphologies of films grown on Si substrates are more uniform than STO substrate. Physical properties of BaBiO3 thin films have been studied using Raman and x-ray photoelectron spectroscopic (XPS) techniques. Room temperature Raman spectroscopy confirms the presence of charge-ordering both in bulk and thin films. Our XPS results however show that the charge-disproportionation of Bi oxidation state (4-δ) and (4+δ) with δ<1 in bulk has been modified in thin films to δ=1.
{"title":"Strain induced modification in physical properties of charge-ordered insulator BaBiO3 thin films","authors":"S. Sarkar, S. Chowdhury, R. Raghunathan, R. Choudhary, D. Phase","doi":"10.1063/1.5130349","DOIUrl":"https://doi.org/10.1063/1.5130349","url":null,"abstract":"Oriented thin films have been prepared using pulsed laser deposition technique on Si (001) and SrTiO3 (STO) (001) substrates. The surface morphologies of films grown on Si substrates are more uniform than STO substrate. Physical properties of BaBiO3 thin films have been studied using Raman and x-ray photoelectron spectroscopic (XPS) techniques. Room temperature Raman spectroscopy confirms the presence of charge-ordering both in bulk and thin films. Our XPS results however show that the charge-disproportionation of Bi oxidation state (4-δ) and (4+δ) with δ<1 in bulk has been modified in thin films to δ=1.Oriented thin films have been prepared using pulsed laser deposition technique on Si (001) and SrTiO3 (STO) (001) substrates. The surface morphologies of films grown on Si substrates are more uniform than STO substrate. Physical properties of BaBiO3 thin films have been studied using Raman and x-ray photoelectron spectroscopic (XPS) techniques. Room temperature Raman spectroscopy confirms the presence of charge-ordering both in bulk and thin films. Our XPS results however show that the charge-disproportionation of Bi oxidation state (4-δ) and (4+δ) with δ<1 in bulk has been modified in thin films to δ=1.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79632634","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 starch based edible films have attracted much attention as the alternative food packaging materials to synthetic plastics due to their properties, such as, high transparency, odorless, biodegradability, tasteless, and semi-permeability to gases and food additives. However, the starch based edible films produced from native starch exhibit poor water resistance and poor mechanical strength. Incorporation of nanomaterials in starch films is considered as an effective method in recent times in order to improve the mechanical and barrier properties. Present investigation focused on the effects of nanocellulose on the film properties of edible films produced from different starch sources, such as, maize starch, rice starch, wheat starch and potato starch. The starch edible films were solution cast by adding 5g/100 ml water, 30 wt% of solution and varying concentrations of nanocellulose (0%, 2%, 5%, 10% & 15% of solution). Water vapor transmission rate (WVTR), mechanical strength (tensile strength, Young’s modulus and percentage of elongation) and film color were determined for the films. The results showed that the addition of nanocellulose had improved the film properties in all the cases, and it could be used as a promising choice for food packaging applications. Among the four starch types, the nanocellulose incorporated edible films produced from potato starch and rice starch showed better film properties compared to those produced from maize starch and wheat starch.The starch based edible films have attracted much attention as the alternative food packaging materials to synthetic plastics due to their properties, such as, high transparency, odorless, biodegradability, tasteless, and semi-permeability to gases and food additives. However, the starch based edible films produced from native starch exhibit poor water resistance and poor mechanical strength. Incorporation of nanomaterials in starch films is considered as an effective method in recent times in order to improve the mechanical and barrier properties. Present investigation focused on the effects of nanocellulose on the film properties of edible films produced from different starch sources, such as, maize starch, rice starch, wheat starch and potato starch. The starch edible films were solution cast by adding 5g/100 ml water, 30 wt% of solution and varying concentrations of nanocellulose (0%, 2%, 5%, 10% & 15% of solution). Water vapor transmission rate (WVTR), mechanical strength (tensile strength, Young’s m...
{"title":"Influence of nanocellulose addition on the film properties of the bionanocomposite edible films prepared from maize, rice, wheat, and potato starches","authors":"J. Jeevahan, M. Chandrasekaran, A. Sethu","doi":"10.1063/1.5130283","DOIUrl":"https://doi.org/10.1063/1.5130283","url":null,"abstract":"The starch based edible films have attracted much attention as the alternative food packaging materials to synthetic plastics due to their properties, such as, high transparency, odorless, biodegradability, tasteless, and semi-permeability to gases and food additives. However, the starch based edible films produced from native starch exhibit poor water resistance and poor mechanical strength. Incorporation of nanomaterials in starch films is considered as an effective method in recent times in order to improve the mechanical and barrier properties. Present investigation focused on the effects of nanocellulose on the film properties of edible films produced from different starch sources, such as, maize starch, rice starch, wheat starch and potato starch. The starch edible films were solution cast by adding 5g/100 ml water, 30 wt% of solution and varying concentrations of nanocellulose (0%, 2%, 5%, 10% & 15% of solution). Water vapor transmission rate (WVTR), mechanical strength (tensile strength, Young’s modulus and percentage of elongation) and film color were determined for the films. The results showed that the addition of nanocellulose had improved the film properties in all the cases, and it could be used as a promising choice for food packaging applications. Among the four starch types, the nanocellulose incorporated edible films produced from potato starch and rice starch showed better film properties compared to those produced from maize starch and wheat starch.The starch based edible films have attracted much attention as the alternative food packaging materials to synthetic plastics due to their properties, such as, high transparency, odorless, biodegradability, tasteless, and semi-permeability to gases and food additives. However, the starch based edible films produced from native starch exhibit poor water resistance and poor mechanical strength. Incorporation of nanomaterials in starch films is considered as an effective method in recent times in order to improve the mechanical and barrier properties. Present investigation focused on the effects of nanocellulose on the film properties of edible films produced from different starch sources, such as, maize starch, rice starch, wheat starch and potato starch. The starch edible films were solution cast by adding 5g/100 ml water, 30 wt% of solution and varying concentrations of nanocellulose (0%, 2%, 5%, 10% & 15% of solution). Water vapor transmission rate (WVTR), mechanical strength (tensile strength, Young’s m...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80239790","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}
T. Joseph, V. K. Sona, A. Aiswarya, Faseeha Abdul Rasheed, Nygil Thomas
A simple, nickel oxide/reduced graphene oxide composite modified carbon paste electrode (NiO/RGO-MCPE) was fabricated as an electrochemical sensor for the sensitive determination of Dopamine (DA). Hummers method and coprecipitation followed by reduction method were used for facile, simple and cost-effective preparation for the modifier graphite oxide and NiO/RGO composite respectively. The composite was characterized by using PXRD, FT-IR and TG-DSC. The greater surface area of NiO/RGO composite improves the performance towards DA. The NiO/RGO-MCPE possesses better electrochemical activity in Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). The developed sensor shows good reproducibility, and stability. Detection limit of DA was determined from differential pulse voltammetry (DPV) and found to be 8.3 nM.A simple, nickel oxide/reduced graphene oxide composite modified carbon paste electrode (NiO/RGO-MCPE) was fabricated as an electrochemical sensor for the sensitive determination of Dopamine (DA). Hummers method and coprecipitation followed by reduction method were used for facile, simple and cost-effective preparation for the modifier graphite oxide and NiO/RGO composite respectively. The composite was characterized by using PXRD, FT-IR and TG-DSC. The greater surface area of NiO/RGO composite improves the performance towards DA. The NiO/RGO-MCPE possesses better electrochemical activity in Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). The developed sensor shows good reproducibility, and stability. Detection limit of DA was determined from differential pulse voltammetry (DPV) and found to be 8.3 nM.
{"title":"Nickel oxide (NiO)/reduced graphene oxide (RGO) composite modified carbon paste electrode as an electrochemical sensor for the sensitive determination of dopamine","authors":"T. Joseph, V. K. Sona, A. Aiswarya, Faseeha Abdul Rasheed, Nygil Thomas","doi":"10.1063/1.5130358","DOIUrl":"https://doi.org/10.1063/1.5130358","url":null,"abstract":"A simple, nickel oxide/reduced graphene oxide composite modified carbon paste electrode (NiO/RGO-MCPE) was fabricated as an electrochemical sensor for the sensitive determination of Dopamine (DA). Hummers method and coprecipitation followed by reduction method were used for facile, simple and cost-effective preparation for the modifier graphite oxide and NiO/RGO composite respectively. The composite was characterized by using PXRD, FT-IR and TG-DSC. The greater surface area of NiO/RGO composite improves the performance towards DA. The NiO/RGO-MCPE possesses better electrochemical activity in Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). The developed sensor shows good reproducibility, and stability. Detection limit of DA was determined from differential pulse voltammetry (DPV) and found to be 8.3 nM.A simple, nickel oxide/reduced graphene oxide composite modified carbon paste electrode (NiO/RGO-MCPE) was fabricated as an electrochemical sensor for the sensitive determination of Dopamine (DA). Hummers method and coprecipitation followed by reduction method were used for facile, simple and cost-effective preparation for the modifier graphite oxide and NiO/RGO composite respectively. The composite was characterized by using PXRD, FT-IR and TG-DSC. The greater surface area of NiO/RGO composite improves the performance towards DA. The NiO/RGO-MCPE possesses better electrochemical activity in Cyclic Voltammetry (CV) and Differential Pulse Voltammetry (DPV). The developed sensor shows good reproducibility, and stability. Detection limit of DA was determined from differential pulse voltammetry (DPV) and found to be 8.3 nM.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82814153","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. Geetha, R. Sivakumar, V. Ganesh, C. Sanjeeviraja
ZnWO4 has received a great deal of attention among the researchers, because of its multi-dimensional characteristics in the field of sensors, optoelectronics and photocatalytic devices. In this work, we report on the synthesis of ZnWO4 nanoparticles using co-precipitation technique with polymeric surfactant. This study aimed to investigate the effect of increasing concentration of surfactant on the morphology, particle size and crystal structure of the synthesized catalyst. The synthesized sample was investigated by XRD, UV-Vis, FT-IR and SEM-EDX to identify its various properties. The XRD analysis confirmed the formation of monoclinic structure of ZnWO4. The EDX study proved the purity of synthesized product. The characteristic molecular vibrational information of ZnWO4 product was obtained through FT-IR measurement.ZnWO4 has received a great deal of attention among the researchers, because of its multi-dimensional characteristics in the field of sensors, optoelectronics and photocatalytic devices. In this work, we report on the synthesis of ZnWO4 nanoparticles using co-precipitation technique with polymeric surfactant. This study aimed to investigate the effect of increasing concentration of surfactant on the morphology, particle size and crystal structure of the synthesized catalyst. The synthesized sample was investigated by XRD, UV-Vis, FT-IR and SEM-EDX to identify its various properties. The XRD analysis confirmed the formation of monoclinic structure of ZnWO4. The EDX study proved the purity of synthesized product. The characteristic molecular vibrational information of ZnWO4 product was obtained through FT-IR measurement.
{"title":"Properties of polymeric surfactant mediated ZnWO4 nanoparticles for photocatalytic application","authors":"G. Geetha, R. Sivakumar, V. Ganesh, C. Sanjeeviraja","doi":"10.1063/1.5130322","DOIUrl":"https://doi.org/10.1063/1.5130322","url":null,"abstract":"ZnWO4 has received a great deal of attention among the researchers, because of its multi-dimensional characteristics in the field of sensors, optoelectronics and photocatalytic devices. In this work, we report on the synthesis of ZnWO4 nanoparticles using co-precipitation technique with polymeric surfactant. This study aimed to investigate the effect of increasing concentration of surfactant on the morphology, particle size and crystal structure of the synthesized catalyst. The synthesized sample was investigated by XRD, UV-Vis, FT-IR and SEM-EDX to identify its various properties. The XRD analysis confirmed the formation of monoclinic structure of ZnWO4. The EDX study proved the purity of synthesized product. The characteristic molecular vibrational information of ZnWO4 product was obtained through FT-IR measurement.ZnWO4 has received a great deal of attention among the researchers, because of its multi-dimensional characteristics in the field of sensors, optoelectronics and photocatalytic devices. In this work, we report on the synthesis of ZnWO4 nanoparticles using co-precipitation technique with polymeric surfactant. This study aimed to investigate the effect of increasing concentration of surfactant on the morphology, particle size and crystal structure of the synthesized catalyst. The synthesized sample was investigated by XRD, UV-Vis, FT-IR and SEM-EDX to identify its various properties. The XRD analysis confirmed the formation of monoclinic structure of ZnWO4. The EDX study proved the purity of synthesized product. The characteristic molecular vibrational information of ZnWO4 product was obtained through FT-IR measurement.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89407399","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}
S. Renjini, Pinky Abraham, T. Kumar, V. Kumary, P. Chithra
The electrochemical performance of palladium incorporated reduced graphene oxide glassy carbon electrode (rGO/Pd/GCE) towards epinephrine (EP) was studied. Modification of GCE with nanocomposite was confirmed using electrochemical techniques such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV) and it was found that the electrochemistry of EP was greatly enhanced. Studies reveal that the oxidation of EP occurs by a diffusion controlled process. Oxidation peak currents of EP exhibited good linearity with the concentration range 1 µM – 10 µM with a very low detection limit of 30 nM. The interference study with DPV showed clear peak separation for uric acid (UA) and EP, which has great relevance in biological systems. Thus the modified electrode can selectively detect EP in presence of UA.
{"title":"Graphene oxide supported palladium nanoparticle as an electrochemical sensor for epinephrine","authors":"S. Renjini, Pinky Abraham, T. Kumar, V. Kumary, P. Chithra","doi":"10.1063/1.5130281","DOIUrl":"https://doi.org/10.1063/1.5130281","url":null,"abstract":"The electrochemical performance of palladium incorporated reduced graphene oxide glassy carbon electrode (rGO/Pd/GCE) towards epinephrine (EP) was studied. Modification of GCE with nanocomposite was confirmed using electrochemical techniques such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV) and it was found that the electrochemistry of EP was greatly enhanced. Studies reveal that the oxidation of EP occurs by a diffusion controlled process. Oxidation peak currents of EP exhibited good linearity with the concentration range 1 µM – 10 µM with a very low detection limit of 30 nM. The interference study with DPV showed clear peak separation for uric acid (UA) and EP, which has great relevance in biological systems. Thus the modified electrode can selectively detect EP in presence of UA.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86763530","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}
In this paper, a non-intrusive, unique optical measurement technique of seeding polystyrene granular beads image velocimetry has been described. The flows of seeded particles are illuminated by laser light and double frame-single exposure images are captured at a specified interval of time. Images are segmented into sub interrogation domain and cross correlation of images are evaluated by Fast Fourier Transform method. From the captured images, particle displacement is calculated and then magnitude of the velocity of micron size seeds in the plane is estimated. This technique is most suitable for high density concentration of seeded particles. Laser speckle velocimetry has wide range of pulse separation time and reduction of noise in the estimation of fluid velocity without directional ambiguity.
{"title":"Micron size particle image velocimetry by fast Fourier transform","authors":"R. Balamurugan, B. Jeeva","doi":"10.1063/1.5130366","DOIUrl":"https://doi.org/10.1063/1.5130366","url":null,"abstract":"In this paper, a non-intrusive, unique optical measurement technique of seeding polystyrene granular beads image velocimetry has been described. The flows of seeded particles are illuminated by laser light and double frame-single exposure images are captured at a specified interval of time. Images are segmented into sub interrogation domain and cross correlation of images are evaluated by Fast Fourier Transform method. From the captured images, particle displacement is calculated and then magnitude of the velocity of micron size seeds in the plane is estimated. This technique is most suitable for high density concentration of seeded particles. Laser speckle velocimetry has wide range of pulse separation time and reduction of noise in the estimation of fluid velocity without directional ambiguity.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88151343","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}
SadasivuniKishor Kumar, KurianJoji, D. Vilasini, JosephJoshy, JosephDeepu, TomEmmanuel, ThomasDeepu
{"title":"Committees Sponsors: Proceedings of the International Conference on Advanced Materials (ICAM2019)","authors":"SadasivuniKishor Kumar, KurianJoji, D. Vilasini, JosephJoshy, JosephDeepu, TomEmmanuel, ThomasDeepu","doi":"10.1063/1.5130210","DOIUrl":"https://doi.org/10.1063/1.5130210","url":null,"abstract":"","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88638406","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}
V. L. Ranganatha, K. Nithin, S. Khanum, G. Nagaraju, C. Mallikarjunaswamy
The unique size-dependent material property engineering, together with parallel technological advancements, that facilitates effective handling and management, have all set the tempo for escalating research on nanostructured materials. In particular, semiconductor metal oxide nanoparticles (NPs) have attracted significant scientific interest, owing to their versatile end applications ranging from antimicrobial to drug delivery, sensors to energy stores and many more. Zinc oxide (ZnO) is one such primary wide band gap semiconductor with large exciton binding energies, direct band gap absorption and intrinsic structural defects induced exciton emission. Besides, ZnO NPs are also known to exhibit particle size and morphology dependent confinements, which may often induce entirely new material properties. Herein, an attempt is made to present a detailed review of the synthetic condition dependent material property tuning and hence, related applications of ZnO NPs. Besides, the article also sheds light on characterization tools adopted towards the successful structural elucidation of metal oxide NPs.The unique size-dependent material property engineering, together with parallel technological advancements, that facilitates effective handling and management, have all set the tempo for escalating research on nanostructured materials. In particular, semiconductor metal oxide nanoparticles (NPs) have attracted significant scientific interest, owing to their versatile end applications ranging from antimicrobial to drug delivery, sensors to energy stores and many more. Zinc oxide (ZnO) is one such primary wide band gap semiconductor with large exciton binding energies, direct band gap absorption and intrinsic structural defects induced exciton emission. Besides, ZnO NPs are also known to exhibit particle size and morphology dependent confinements, which may often induce entirely new material properties. Herein, an attempt is made to present a detailed review of the synthetic condition dependent material property tuning and hence, related applications of ZnO NPs. Besides, the article also sheds light on char...
{"title":"Zinc oxide nanoparticles: A significant review on synthetic strategies, characterization and applications","authors":"V. L. Ranganatha, K. Nithin, S. Khanum, G. Nagaraju, C. Mallikarjunaswamy","doi":"10.1063/1.5130299","DOIUrl":"https://doi.org/10.1063/1.5130299","url":null,"abstract":"The unique size-dependent material property engineering, together with parallel technological advancements, that facilitates effective handling and management, have all set the tempo for escalating research on nanostructured materials. In particular, semiconductor metal oxide nanoparticles (NPs) have attracted significant scientific interest, owing to their versatile end applications ranging from antimicrobial to drug delivery, sensors to energy stores and many more. Zinc oxide (ZnO) is one such primary wide band gap semiconductor with large exciton binding energies, direct band gap absorption and intrinsic structural defects induced exciton emission. Besides, ZnO NPs are also known to exhibit particle size and morphology dependent confinements, which may often induce entirely new material properties. Herein, an attempt is made to present a detailed review of the synthetic condition dependent material property tuning and hence, related applications of ZnO NPs. Besides, the article also sheds light on characterization tools adopted towards the successful structural elucidation of metal oxide NPs.The unique size-dependent material property engineering, together with parallel technological advancements, that facilitates effective handling and management, have all set the tempo for escalating research on nanostructured materials. In particular, semiconductor metal oxide nanoparticles (NPs) have attracted significant scientific interest, owing to their versatile end applications ranging from antimicrobial to drug delivery, sensors to energy stores and many more. Zinc oxide (ZnO) is one such primary wide band gap semiconductor with large exciton binding energies, direct band gap absorption and intrinsic structural defects induced exciton emission. Besides, ZnO NPs are also known to exhibit particle size and morphology dependent confinements, which may often induce entirely new material properties. Herein, an attempt is made to present a detailed review of the synthetic condition dependent material property tuning and hence, related applications of ZnO NPs. Besides, the article also sheds light on char...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81404877","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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