In this work, we report the effects of calcination temperature on structural, dielectric, semiconducting and optical properties of YFeO3 nanoparticles prepared by a high energy ball milling process. The structural analysis of the X-ray diffraction data shows that YFeO3 exists in orthorhombic as well as in hexagonal mixed-phase states. The Rietveld analysis confirms that orthorhombic YFeO3 crystallizes into Pnma space group. The optical band gap of YFeO3 reduces from 1.96 eV to 1.68 eV with increasing the calcination temperature of the YFeO3 sample. The bandgap reducing effect might be attributed to the increased crystallite size and decreased lattice strain which is confirmed by the Williamson-Hall plot method. The obtained low bandgap YFeO3 ceramic may provide a new possibility to develop eco-friendly Ferroelectric photovoltaic devices.
{"title":"Structural, dielectric, semiconducting and optical properties of high-energy ball milled YFeO3 nano-particles","authors":"C. Singh, D. Kumar, N. Verma, A. Singh","doi":"10.1063/1.5113458","DOIUrl":"https://doi.org/10.1063/1.5113458","url":null,"abstract":"In this work, we report the effects of calcination temperature on structural, dielectric, semiconducting and optical properties of YFeO3 nanoparticles prepared by a high energy ball milling process. The structural analysis of the X-ray diffraction data shows that YFeO3 exists in orthorhombic as well as in hexagonal mixed-phase states. The Rietveld analysis confirms that orthorhombic YFeO3 crystallizes into Pnma space group. The optical band gap of YFeO3 reduces from 1.96 eV to 1.68 eV with increasing the calcination temperature of the YFeO3 sample. The bandgap reducing effect might be attributed to the increased crystallite size and decreased lattice strain which is confirmed by the Williamson-Hall plot method. The obtained low bandgap YFeO3 ceramic may provide a new possibility to develop eco-friendly Ferroelectric photovoltaic devices.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75748853","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}
Hydroxamic acid moiety has enormous selectivity towards uranium or uranyl ions. The fresh and metal ions loaded Polyacrylamidehydroxamic acid (PHA) matrix were characterized by FT-IR, XRD, and Mossbauer spectroscopy techniques. XRD, Mossbauer spectroscopy, and coloration of different metal ions have been confirmed the removal of uranium and other ions with high selectivity and immobilization factor of PHA resin for nuclear effluent treatment. (Inductively coupled plasma - atomic emission spectrophotometer) ICP-AES and Stripping voltameter data analysis also justifies the same fact.Hydroxamic acid moiety has enormous selectivity towards uranium or uranyl ions. The fresh and metal ions loaded Polyacrylamidehydroxamic acid (PHA) matrix were characterized by FT-IR, XRD, and Mossbauer spectroscopy techniques. XRD, Mossbauer spectroscopy, and coloration of different metal ions have been confirmed the removal of uranium and other ions with high selectivity and immobilization factor of PHA resin for nuclear effluent treatment. (Inductively coupled plasma - atomic emission spectrophotometer) ICP-AES and Stripping voltameter data analysis also justifies the same fact.
{"title":"Characterization and performance of nuclear plant floor washed effluent treated resin","authors":"Sangita Pal, S. Meena","doi":"10.1063/1.5113093","DOIUrl":"https://doi.org/10.1063/1.5113093","url":null,"abstract":"Hydroxamic acid moiety has enormous selectivity towards uranium or uranyl ions. The fresh and metal ions loaded Polyacrylamidehydroxamic acid (PHA) matrix were characterized by FT-IR, XRD, and Mossbauer spectroscopy techniques. XRD, Mossbauer spectroscopy, and coloration of different metal ions have been confirmed the removal of uranium and other ions with high selectivity and immobilization factor of PHA resin for nuclear effluent treatment. (Inductively coupled plasma - atomic emission spectrophotometer) ICP-AES and Stripping voltameter data analysis also justifies the same fact.Hydroxamic acid moiety has enormous selectivity towards uranium or uranyl ions. The fresh and metal ions loaded Polyacrylamidehydroxamic acid (PHA) matrix were characterized by FT-IR, XRD, and Mossbauer spectroscopy techniques. XRD, Mossbauer spectroscopy, and coloration of different metal ions have been confirmed the removal of uranium and other ions with high selectivity and immobilization factor of PHA resin for nuclear effluent treatment. (Inductively coupled plasma - atomic emission spectrophotometer) ICP-AES and Stripping voltameter data analysis also justifies the same fact.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"7 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78430628","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 structural and emission analysis of Sr2SnO4, Sr1.99Eu0.01SnO4, and Sr2Sn0.99Eu0.01O4 were analysed in detail. The thermal analysis of the mixture of raw materials reveals the reaction among the raw materials takes place around 1000°C. The Reitveld refinement of the x-ray diffraction data shows the solubility of Eu on both site of Sr2SnO4. Higher crystallite size and lattice strain were observed for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4, because Eu3+ acts as donor at Sr2+ site while as acceptor at Sn4+ site. Absences of any band associated with raw materials in Raman spectrum also confirm the monophasic nature of the sample. The photoluminescence (PL) spectra of Eu-doped samples exhibits strong peak at 612 nm ascribed to electric dipole transition 5D0→7F2 of Eu3+ shows higher peak intensity and width for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4.The structural and emission analysis of Sr2SnO4, Sr1.99Eu0.01SnO4, and Sr2Sn0.99Eu0.01O4 were analysed in detail. The thermal analysis of the mixture of raw materials reveals the reaction among the raw materials takes place around 1000°C. The Reitveld refinement of the x-ray diffraction data shows the solubility of Eu on both site of Sr2SnO4. Higher crystallite size and lattice strain were observed for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4, because Eu3+ acts as donor at Sr2+ site while as acceptor at Sn4+ site. Absences of any band associated with raw materials in Raman spectrum also confirm the monophasic nature of the sample. The photoluminescence (PL) spectra of Eu-doped samples exhibits strong peak at 612 nm ascribed to electric dipole transition 5D0→7F2 of Eu3+ shows higher peak intensity and width for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4.
{"title":"Structural and optical properties of Eu-doped at the site of Sr and Sn in Sr2SnO4 layered perovskite","authors":"U. Kumar, D. Yadav, Gurudeo Nirala Shail Upadhyay","doi":"10.1063/1.5113305","DOIUrl":"https://doi.org/10.1063/1.5113305","url":null,"abstract":"The structural and emission analysis of Sr2SnO4, Sr1.99Eu0.01SnO4, and Sr2Sn0.99Eu0.01O4 were analysed in detail. The thermal analysis of the mixture of raw materials reveals the reaction among the raw materials takes place around 1000°C. The Reitveld refinement of the x-ray diffraction data shows the solubility of Eu on both site of Sr2SnO4. Higher crystallite size and lattice strain were observed for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4, because Eu3+ acts as donor at Sr2+ site while as acceptor at Sn4+ site. Absences of any band associated with raw materials in Raman spectrum also confirm the monophasic nature of the sample. The photoluminescence (PL) spectra of Eu-doped samples exhibits strong peak at 612 nm ascribed to electric dipole transition 5D0→7F2 of Eu3+ shows higher peak intensity and width for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4.The structural and emission analysis of Sr2SnO4, Sr1.99Eu0.01SnO4, and Sr2Sn0.99Eu0.01O4 were analysed in detail. The thermal analysis of the mixture of raw materials reveals the reaction among the raw materials takes place around 1000°C. The Reitveld refinement of the x-ray diffraction data shows the solubility of Eu on both site of Sr2SnO4. Higher crystallite size and lattice strain were observed for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4, because Eu3+ acts as donor at Sr2+ site while as acceptor at Sn4+ site. Absences of any band associated with raw materials in Raman spectrum also confirm the monophasic nature of the sample. The photoluminescence (PL) spectra of Eu-doped samples exhibits strong peak at 612 nm ascribed to electric dipole transition 5D0→7F2 of Eu3+ shows higher peak intensity and width for Sr1.99Eu0.01SnO4 than Sr2Sn0.99Eu0.01O4.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81848589","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}
Production of activated carbon from natural resources has been a hot topic in the recent few years. We could obtain carbon from the tree bark of Tamarindus Indica through anaerobic burning process. The obtained carbon was chemically activated using KOH solution. The prepared activated carbon was studied towards the application of supercapacitors. Structural studies confirm the presence of carbon. The activated carbon yields a maximum specific capacitance of 288 F g−1 at a specific current of 5 A g−1 with an exceptionally small charge transfer resistance of 0.25 Ω. The electrochemical results seem to indicate that the prepared activated carbon is a sustainable candidate for effective supercapacitor applications.Production of activated carbon from natural resources has been a hot topic in the recent few years. We could obtain carbon from the tree bark of Tamarindus Indica through anaerobic burning process. The obtained carbon was chemically activated using KOH solution. The prepared activated carbon was studied towards the application of supercapacitors. Structural studies confirm the presence of carbon. The activated carbon yields a maximum specific capacitance of 288 F g−1 at a specific current of 5 A g−1 with an exceptionally small charge transfer resistance of 0.25 Ω. The electrochemical results seem to indicate that the prepared activated carbon is a sustainable candidate for effective supercapacitor applications.
从自然资源中生产活性炭是近年来的一个热门话题。我们可以通过厌氧燃烧的方法从柽柳树皮中提取碳。得到的碳用KOH溶液进行化学活化。对制备的活性炭在超级电容器中的应用进行了研究。结构研究证实了碳的存在。该活性炭在比电流为5 a g−1时的最大比电容为288 F g−1，电荷转移电阻极小，为0.25 Ω。电化学结果似乎表明，所制备的活性炭是一个可持续的候选有效的超级电容器应用。从自然资源中生产活性炭是近年来的一个热门话题。我们可以通过厌氧燃烧的方法从柽柳树皮中提取碳。得到的碳用KOH溶液进行化学活化。对制备的活性炭在超级电容器中的应用进行了研究。结构研究证实了碳的存在。该活性炭在比电流为5 a g−1时的最大比电容为288 F g−1，电荷转移电阻极小，为0.25 Ω。电化学结果似乎表明，所制备的活性炭是一个可持续的候选有效的超级电容器应用。
{"title":"Derivation of activated carbon from tamarindus indica tree bark for supercapacitor applications","authors":"S. Nandhini, G. Muralidharan","doi":"10.1063/1.5113379","DOIUrl":"https://doi.org/10.1063/1.5113379","url":null,"abstract":"Production of activated carbon from natural resources has been a hot topic in the recent few years. We could obtain carbon from the tree bark of Tamarindus Indica through anaerobic burning process. The obtained carbon was chemically activated using KOH solution. The prepared activated carbon was studied towards the application of supercapacitors. Structural studies confirm the presence of carbon. The activated carbon yields a maximum specific capacitance of 288 F g−1 at a specific current of 5 A g−1 with an exceptionally small charge transfer resistance of 0.25 Ω. The electrochemical results seem to indicate that the prepared activated carbon is a sustainable candidate for effective supercapacitor applications.Production of activated carbon from natural resources has been a hot topic in the recent few years. We could obtain carbon from the tree bark of Tamarindus Indica through anaerobic burning process. The obtained carbon was chemically activated using KOH solution. The prepared activated carbon was studied towards the application of supercapacitors. Structural studies confirm the presence of carbon. The activated carbon yields a maximum specific capacitance of 288 F g−1 at a specific current of 5 A g−1 with an exceptionally small charge transfer resistance of 0.25 Ω. The electrochemical results seem to indicate that the prepared activated carbon is a sustainable candidate for effective supercapacitor applications.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84332431","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}
ZnO/La0.7Sr0.3MnO3 (LSMO) heterostructures with different ZnO thickness were grown on (001) oriented silicon (Si) substrates by using RF-magnetron sputtering. The x-ray diffraction confirmed that the ZnO was grown epitaxially on LSMO/Si. The out-of-plane lattice parameter (3.863 A) of LSMO film on Si experience 0.6 % strain, while that of ZnO experience 0.07 %. The heterostructure shows paramagnetic to ferromagnetic transition around 300 K, relatively lower that the bulk LSMO. The electrical transport in the heterostructure is non-linear and exhibits a transition from insulator like-to-metal like behavior on decreasing temperature from 300 K to 10 K. The study of this heterostructure may provide useful information for the future development of Si based electronic devices using oxide materials.ZnO/La0.7Sr0.3MnO3 (LSMO) heterostructures with different ZnO thickness were grown on (001) oriented silicon (Si) substrates by using RF-magnetron sputtering. The x-ray diffraction confirmed that the ZnO was grown epitaxially on LSMO/Si. The out-of-plane lattice parameter (3.863 A) of LSMO film on Si experience 0.6 % strain, while that of ZnO experience 0.07 %. The heterostructure shows paramagnetic to ferromagnetic transition around 300 K, relatively lower that the bulk LSMO. The electrical transport in the heterostructure is non-linear and exhibits a transition from insulator like-to-metal like behavior on decreasing temperature from 300 K to 10 K. The study of this heterostructure may provide useful information for the future development of Si based electronic devices using oxide materials.
{"title":"Magnetic and electrical properties of Zno/La0.7Sr0.3MnO3 heterostructures","authors":"B. Das, S. N. Achary, P. Padhan","doi":"10.1063/1.5113172","DOIUrl":"https://doi.org/10.1063/1.5113172","url":null,"abstract":"ZnO/La0.7Sr0.3MnO3 (LSMO) heterostructures with different ZnO thickness were grown on (001) oriented silicon (Si) substrates by using RF-magnetron sputtering. The x-ray diffraction confirmed that the ZnO was grown epitaxially on LSMO/Si. The out-of-plane lattice parameter (3.863 A) of LSMO film on Si experience 0.6 % strain, while that of ZnO experience 0.07 %. The heterostructure shows paramagnetic to ferromagnetic transition around 300 K, relatively lower that the bulk LSMO. The electrical transport in the heterostructure is non-linear and exhibits a transition from insulator like-to-metal like behavior on decreasing temperature from 300 K to 10 K. The study of this heterostructure may provide useful information for the future development of Si based electronic devices using oxide materials.ZnO/La0.7Sr0.3MnO3 (LSMO) heterostructures with different ZnO thickness were grown on (001) oriented silicon (Si) substrates by using RF-magnetron sputtering. The x-ray diffraction confirmed that the ZnO was grown epitaxially on LSMO/Si. The out-of-plane lattice parameter (3.863 A) of LSMO film on Si experience 0.6 % strain, while that of ZnO experience 0.07 %. The heterostructure shows paramagnetic to ferromagnetic transition around 300 K, relatively lower that the bulk LSMO. The electrical transport in the heterostructure is non-linear and exhibits a transition from insulator like-to-metal like behavior on decreasing temperature from 300 K to 10 K. The study of this heterostructure may provide useful information for the future development of Si based electronic devices using oxide materials.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76846439","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 resistivity and transverse magnetoresistance properties of recently discovered magnetic Weyl semimetal Co3Sn2S2 is studied. Co3Sn2S2 is synthesized using solid state reaction technique and crystallizes in trigonal structure with space group R-3m(166). The temperature dependent resistivity increases with the application of magnetic field and resistivity plateau is observed at low temperatures. A highest MR ∼ 215% at 2K and 6T is observed with no signs of saturation. We find MR deviation from Kohler’s rule and non-linearity of magnetoresistance with magnetic field is assigned to multiband effect.The resistivity and transverse magnetoresistance properties of recently discovered magnetic Weyl semimetal Co3Sn2S2 is studied. Co3Sn2S2 is synthesized using solid state reaction technique and crystallizes in trigonal structure with space group R-3m(166). The temperature dependent resistivity increases with the application of magnetic field and resistivity plateau is observed at low temperatures. A highest MR ∼ 215% at 2K and 6T is observed with no signs of saturation. We find MR deviation from Kohler’s rule and non-linearity of magnetoresistance with magnetic field is assigned to multiband effect.
{"title":"Magneto-transport properties of magnetic Weyl semimetal Co3Sn2S2","authors":"V. Nagpal, P. Kumar, S. Patnaik","doi":"10.1063/1.5113252","DOIUrl":"https://doi.org/10.1063/1.5113252","url":null,"abstract":"The resistivity and transverse magnetoresistance properties of recently discovered magnetic Weyl semimetal Co3Sn2S2 is studied. Co3Sn2S2 is synthesized using solid state reaction technique and crystallizes in trigonal structure with space group R-3m(166). The temperature dependent resistivity increases with the application of magnetic field and resistivity plateau is observed at low temperatures. A highest MR ∼ 215% at 2K and 6T is observed with no signs of saturation. We find MR deviation from Kohler’s rule and non-linearity of magnetoresistance with magnetic field is assigned to multiband effect.The resistivity and transverse magnetoresistance properties of recently discovered magnetic Weyl semimetal Co3Sn2S2 is studied. Co3Sn2S2 is synthesized using solid state reaction technique and crystallizes in trigonal structure with space group R-3m(166). The temperature dependent resistivity increases with the application of magnetic field and resistivity plateau is observed at low temperatures. A highest MR ∼ 215% at 2K and 6T is observed with no signs of saturation. We find MR deviation from Kohler’s rule and non-linearity of magnetoresistance with magnetic field is assigned to multiband effect.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"162 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78008143","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}
P. Rath, B. Priyadarshini, S. S. Behera, P. Parhi, S. R. Panda, T. Sahoo
TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.
{"title":"Adsorptive removal of Congo Red dye from aqueous solution using TiO2 nanoparticles: Kinetics, thermodynamics and isothermal insights","authors":"P. Rath, B. Priyadarshini, S. S. Behera, P. Parhi, S. R. Panda, T. Sahoo","doi":"10.1063/1.5112954","DOIUrl":"https://doi.org/10.1063/1.5112954","url":null,"abstract":"TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.TiO2 nanoparticles have been synthesized by co-precipitation method and is used as an adsorbent for removal of toxic Congo Red (CR) dye. The resulting adsorbent TiO2 was characterized by X-ray powder diffraction pattern, confirming the rutile phase of TiO2 nanoparticle. Adsorption equilibrium data were evaluated by Langmuir isotherm and Freundlich adsorption isotherm. The kinetic data were analyzed using pseudo-first order, pseudo-second order and intraparticle diffusion equations. Kinetics result revealed that the adsorption of CR is of pseudo second-order and chemisorption type. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and the positive value of ΔH° (2.64 kJmol−1) corresponds to an endothermic nature of the adsorption process and the positive value of ΔS° (0.162 Jmol−1 K−1) reveals the increased randomness of the dye during adsorption process.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82320668","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}
Multiferroics with composition Bi0.9Pr0.1Fe1-xMnxO3 (x=0.15, 0.20). has been synthesized by solid-state reaction technique. Rietveld analysis of the XRD patterns revealed that both the samples have rhombohedral crystal structure (R3c). Distortion in the lattice is observed due to mismatch of B-site ions radii. Dielectric constant and tanδ decrease rapidly with frequency showing dispersion behavior at low frequency.
{"title":"Study of structural and dielectric properties of Mn doped Bi0.90Pr0.10FeO3 ceramics","authors":"Muskaan Tuteja, S. Sanghi, M. Yadav, Tanvi Bhasin","doi":"10.1063/1.5113357","DOIUrl":"https://doi.org/10.1063/1.5113357","url":null,"abstract":"Multiferroics with composition Bi0.9Pr0.1Fe1-xMnxO3 (x=0.15, 0.20). has been synthesized by solid-state reaction technique. Rietveld analysis of the XRD patterns revealed that both the samples have rhombohedral crystal structure (R3c). Distortion in the lattice is observed due to mismatch of B-site ions radii. Dielectric constant and tanδ decrease rapidly with frequency showing dispersion behavior at low frequency.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87921706","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}
M. V. Khedkar, Ashok V. Humbe, A. Rao, G. Bichile, K. M. Jadhav
The experimental results on physical properties of water glass (sodium silicate) based silica aerogels prepared by single step sol-gel process, dried at atmospheric pressure are reported. The intention of this work was to produce and optimize the preparation of silica aerogel using low-cost material and easy as well as safe ambient pressure drying method. Surface of prepared hydrogel was modified by using TMCS as silylating agent to get hydrophobic aerogels. Silica aerogel were characterized by FTIR (Fourier transform infrared spectroscopy) used for study the chemical states or chemical bonding of silica aerogel. Increase in amount of water with respect to sodium silicate gelation time as well as density also increases. The hydrophobic nature of the prepared samples was studied through contact angle measurements.The experimental results on physical properties of water glass (sodium silicate) based silica aerogels prepared by single step sol-gel process, dried at atmospheric pressure are reported. The intention of this work was to produce and optimize the preparation of silica aerogel using low-cost material and easy as well as safe ambient pressure drying method. Surface of prepared hydrogel was modified by using TMCS as silylating agent to get hydrophobic aerogels. Silica aerogel were characterized by FTIR (Fourier transform infrared spectroscopy) used for study the chemical states or chemical bonding of silica aerogel. Increase in amount of water with respect to sodium silicate gelation time as well as density also increases. The hydrophobic nature of the prepared samples was studied through contact angle measurements.
{"title":"Synthesis of sodium silicate based aerogels by ambient pressure drying and their physical properties","authors":"M. V. Khedkar, Ashok V. Humbe, A. Rao, G. Bichile, K. M. Jadhav","doi":"10.1063/1.5113100","DOIUrl":"https://doi.org/10.1063/1.5113100","url":null,"abstract":"The experimental results on physical properties of water glass (sodium silicate) based silica aerogels prepared by single step sol-gel process, dried at atmospheric pressure are reported. The intention of this work was to produce and optimize the preparation of silica aerogel using low-cost material and easy as well as safe ambient pressure drying method. Surface of prepared hydrogel was modified by using TMCS as silylating agent to get hydrophobic aerogels. Silica aerogel were characterized by FTIR (Fourier transform infrared spectroscopy) used for study the chemical states or chemical bonding of silica aerogel. Increase in amount of water with respect to sodium silicate gelation time as well as density also increases. The hydrophobic nature of the prepared samples was studied through contact angle measurements.The experimental results on physical properties of water glass (sodium silicate) based silica aerogels prepared by single step sol-gel process, dried at atmospheric pressure are reported. The intention of this work was to produce and optimize the preparation of silica aerogel using low-cost material and easy as well as safe ambient pressure drying method. Surface of prepared hydrogel was modified by using TMCS as silylating agent to get hydrophobic aerogels. Silica aerogel were characterized by FTIR (Fourier transform infrared spectroscopy) used for study the chemical states or chemical bonding of silica aerogel. Increase in amount of water with respect to sodium silicate gelation time as well as density also increases. The hydrophobic nature of the prepared samples was studied through contact angle measurements.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86864110","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}
Chetana Ghosal, S. Ghosh, D. Mandal, B. Chattopadhyay
In this work, poly (vinylidene fluoride)/protein composite films are prepared which is free standing and flexible. Nucleation of electroactive β-phase in poly (vinylidene fluoride) (PVDF) and consecutive surface morphological changes with different weight percentage of protein is systematically investigated. Finally, the PVDF/protein composite film is used to make a mechanical energy harvesting device. The flexible device produces 2.5 V open-circuit voltage under repeated hand punching. Thus, the device can be used for self-powered consumer electronics in near future.In this work, poly (vinylidene fluoride)/protein composite films are prepared which is free standing and flexible. Nucleation of electroactive β-phase in poly (vinylidene fluoride) (PVDF) and consecutive surface morphological changes with different weight percentage of protein is systematically investigated. Finally, the PVDF/protein composite film is used to make a mechanical energy harvesting device. The flexible device produces 2.5 V open-circuit voltage under repeated hand punching. Thus, the device can be used for self-powered consumer electronics in near future.
{"title":"Protein promoted β-phase nucleation in poly (vinylidene fluoride) for energy harvesting applications","authors":"Chetana Ghosal, S. Ghosh, D. Mandal, B. Chattopadhyay","doi":"10.1063/1.5113431","DOIUrl":"https://doi.org/10.1063/1.5113431","url":null,"abstract":"In this work, poly (vinylidene fluoride)/protein composite films are prepared which is free standing and flexible. Nucleation of electroactive β-phase in poly (vinylidene fluoride) (PVDF) and consecutive surface morphological changes with different weight percentage of protein is systematically investigated. Finally, the PVDF/protein composite film is used to make a mechanical energy harvesting device. The flexible device produces 2.5 V open-circuit voltage under repeated hand punching. Thus, the device can be used for self-powered consumer electronics in near future.In this work, poly (vinylidene fluoride)/protein composite films are prepared which is free standing and flexible. Nucleation of electroactive β-phase in poly (vinylidene fluoride) (PVDF) and consecutive surface morphological changes with different weight percentage of protein is systematically investigated. Finally, the PVDF/protein composite film is used to make a mechanical energy harvesting device. The flexible device produces 2.5 V open-circuit voltage under repeated hand punching. Thus, the device can be used for self-powered consumer electronics in near future.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87021925","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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