Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnetization of a particle from one easy direction to the other. The semiconducting properties along with room temperature ferromagnetism make DNA assisted synthesized nanoceria suitable for fabrication of next generation spintronic devices.Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnet...
{"title":"Investigation on the size dependent optical and magnetic properties of DNA assisted synthesized nanoceria for next generation spintronic devices","authors":"P. Jyothi, B. Anitha, N. Tharayil","doi":"10.1063/1.5130335","DOIUrl":"https://doi.org/10.1063/1.5130335","url":null,"abstract":"Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnetization of a particle from one easy direction to the other. The semiconducting properties along with room temperature ferromagnetism make DNA assisted synthesized nanoceria suitable for fabrication of next generation spintronic devices.Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnet...","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":"75137388","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}
Iodine doped zinc oxide (I-ZnO) thin films were synthesized by microwave assisted successive ionic layer adsorption (mSILAR) method. The structural characteristics of pure ZnO and I-ZnO thin films were carried out by powder X-ray diffraction (PXRD) analysis. The potential toxicity of pure and I-ZnO films was examined against gram-positive species like Staphylococcus aureus, Streptococcus haemolyticus and Bacillus cereus as well as gram-negative species like Escherichia coli, Klebsiella pneumonia, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Serratia marcescens, Proteus rettigiri and Vibrio cholera by employing disc diffusion method. All the samples exhibited antibacterial activity on the tested organisms. I-ZnO produced maximum activity against both gram-positive and gram-negative species compared with pure ZnO thin film. The gram-positive species were observed to be more resistant to pure and I-ZnO thin films than gram-negative species. The studies revealed an enhancement in antibacterial activity of the I-doped thin films as compared to pure ZnO thin films.Iodine doped zinc oxide (I-ZnO) thin films were synthesized by microwave assisted successive ionic layer adsorption (mSILAR) method. The structural characteristics of pure ZnO and I-ZnO thin films were carried out by powder X-ray diffraction (PXRD) analysis. The potential toxicity of pure and I-ZnO films was examined against gram-positive species like Staphylococcus aureus, Streptococcus haemolyticus and Bacillus cereus as well as gram-negative species like Escherichia coli, Klebsiella pneumonia, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Serratia marcescens, Proteus rettigiri and Vibrio cholera by employing disc diffusion method. All the samples exhibited antibacterial activity on the tested organisms. I-ZnO produced maximum activity against both gram-positive and gram-negative species compared with pure ZnO thin film. The gram-positive species were observed to be more resistant to pure and I-ZnO thin films than gram-negative species. The studies revealed an enhancement in antibacterial ...
{"title":"A scrutiny of antibacterial activity of pure and iodine doped ZnO thin films synthesized by mSILAR method","authors":"Deepu Thomas, Jyothi Abraham, K. K. Sadasivuni","doi":"10.1063/1.5130376","DOIUrl":"https://doi.org/10.1063/1.5130376","url":null,"abstract":"Iodine doped zinc oxide (I-ZnO) thin films were synthesized by microwave assisted successive ionic layer adsorption (mSILAR) method. The structural characteristics of pure ZnO and I-ZnO thin films were carried out by powder X-ray diffraction (PXRD) analysis. The potential toxicity of pure and I-ZnO films was examined against gram-positive species like Staphylococcus aureus, Streptococcus haemolyticus and Bacillus cereus as well as gram-negative species like Escherichia coli, Klebsiella pneumonia, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Serratia marcescens, Proteus rettigiri and Vibrio cholera by employing disc diffusion method. All the samples exhibited antibacterial activity on the tested organisms. I-ZnO produced maximum activity against both gram-positive and gram-negative species compared with pure ZnO thin film. The gram-positive species were observed to be more resistant to pure and I-ZnO thin films than gram-negative species. The studies revealed an enhancement in antibacterial activity of the I-doped thin films as compared to pure ZnO thin films.Iodine doped zinc oxide (I-ZnO) thin films were synthesized by microwave assisted successive ionic layer adsorption (mSILAR) method. The structural characteristics of pure ZnO and I-ZnO thin films were carried out by powder X-ray diffraction (PXRD) analysis. The potential toxicity of pure and I-ZnO films was examined against gram-positive species like Staphylococcus aureus, Streptococcus haemolyticus and Bacillus cereus as well as gram-negative species like Escherichia coli, Klebsiella pneumonia, Proteus vulgaris, Pseudomonas aeruginosa, Salmonella typhi, Serratia marcescens, Proteus rettigiri and Vibrio cholera by employing disc diffusion method. All the samples exhibited antibacterial activity on the tested organisms. I-ZnO produced maximum activity against both gram-positive and gram-negative species compared with pure ZnO thin film. The gram-positive species were observed to be more resistant to pure and I-ZnO thin films than gram-negative species. The studies revealed an enhancement in antibacterial ...","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":"73633655","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}
Jovia Jose, Sikha K. Simon, Anju Sebastian, Sreedevi P. Chakyar, Joe Kizhakooden, Nees Paul, C. Bindu, K. Umadevi, J. Andrews, V. Joseph
This paper implements Nonstandard Finite Difference Time Domain (NS-FDTD) method to analyses the scattering effect of electromagnetic wave by an artificial plasma cylinder. This NS-FDTD which requires less iteration time for convergence has proved to be around 10,000 times more accurate than the standard FDTD. For a chosen problem, the ratio between wave length and grid space in NS-FDTD need to be only 8 whereas for the standard algorithm it has to be 1140 for the same qualitative result. In this paper, NS-FDTD algorithm which is already successfully implemented for lossless and low loss medium is extended to high loss medium. An artificial negative permittivity metamaterial medium of cylindrical profile is designed using periodic arrangement of thin conducting wires and NS-FDTD is used to study the scattering properties of the plasma structure. For simplicity, interacting field quantities are realized in terms of propagation equation. Converging points of stability function are carefully selected by choosing appropriate value of conductivity. Plane wave of frequency less than the plasma frequency of the artificial plasma cylinder is used for the study. The result obtained is compared with standard FDTD which proves the obvious advantage of using this novel algorithm.
{"title":"Scattering from artificial plasma cylinder using nonstandard FDTD","authors":"Jovia Jose, Sikha K. Simon, Anju Sebastian, Sreedevi P. Chakyar, Joe Kizhakooden, Nees Paul, C. Bindu, K. Umadevi, J. Andrews, V. Joseph","doi":"10.1063/1.5130279","DOIUrl":"https://doi.org/10.1063/1.5130279","url":null,"abstract":"This paper implements Nonstandard Finite Difference Time Domain (NS-FDTD) method to analyses the scattering effect of electromagnetic wave by an artificial plasma cylinder. This NS-FDTD which requires less iteration time for convergence has proved to be around 10,000 times more accurate than the standard FDTD. For a chosen problem, the ratio between wave length and grid space in NS-FDTD need to be only 8 whereas for the standard algorithm it has to be 1140 for the same qualitative result. In this paper, NS-FDTD algorithm which is already successfully implemented for lossless and low loss medium is extended to high loss medium. An artificial negative permittivity metamaterial medium of cylindrical profile is designed using periodic arrangement of thin conducting wires and NS-FDTD is used to study the scattering properties of the plasma structure. For simplicity, interacting field quantities are realized in terms of propagation equation. Converging points of stability function are carefully selected by choosing appropriate value of conductivity. Plane wave of frequency less than the plasma frequency of the artificial plasma cylinder is used for the study. The result obtained is compared with standard FDTD which proves the obvious advantage of using this novel algorithm.","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":"84616883","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}
Herein, we report the electrical properties of a heterostructure based on n-Si (100) and zinc phthalocyanine (ZnPc) thin films which displays asymmetric current-voltage (I-V) characteristics under the applied voltage sweep. ZnPc thin films were deposited onto clean silicon wafers and quartz substrates through vacuum thermal evaporation technique. Spectroscopic techniques such as UV-visible, PL and FTIR were used in order to investigate the optical properties of the thin films. The α-phase of the as deposited ZnPc film was recognized from the positions and intensity of the peak in the visible region of UV-visible spectroscopy. Optical energy gap of the deposited ZnPc thin film was estimated from the Tauc’s plot and the result is compared with PL spectra. PL spectra show a strong peak located at around ∼ 392 nm, which corresponds to an energy of ∼ 3.13 eV. Microstructural properties of the thin film were studied by the X-ray diffraction which shows preferential orientation along (200) direction and a broad hump appears at around 2θ ∼ 30°. SEM and AFM images display uniform growth of ZnPc thin films, comprising spherical nanoparticles over the substrate surface. The surface RMS roughness of the thin film was estimated from AFM analysis and found to be around ∼ 5.3 nm. The room temperature electrical studies of the fabricated device (Al/n-Si (100)/ ZnPc/ Al) were performed which displays rectifying character in the positive sweep and electrical hysteresis at negative voltage sweep. A suitable energy band diagram is proposed to explain the electrical property of the heterojunction device.Herein, we report the electrical properties of a heterostructure based on n-Si (100) and zinc phthalocyanine (ZnPc) thin films which displays asymmetric current-voltage (I-V) characteristics under the applied voltage sweep. ZnPc thin films were deposited onto clean silicon wafers and quartz substrates through vacuum thermal evaporation technique. Spectroscopic techniques such as UV-visible, PL and FTIR were used in order to investigate the optical properties of the thin films. The α-phase of the as deposited ZnPc film was recognized from the positions and intensity of the peak in the visible region of UV-visible spectroscopy. Optical energy gap of the deposited ZnPc thin film was estimated from the Tauc’s plot and the result is compared with PL spectra. PL spectra show a strong peak located at around ∼ 392 nm, which corresponds to an energy of ∼ 3.13 eV. Microstructural properties of the thin film were studied by the X-ray diffraction which shows preferential orientation along (200) direction and a broad ...
{"title":"Studies on electrical characteristics of organic-inorganic heterostructures","authors":"N. S. Das, K. K. Gogoi, R. Das, A. Chowdhury","doi":"10.1063/1.5130218","DOIUrl":"https://doi.org/10.1063/1.5130218","url":null,"abstract":"Herein, we report the electrical properties of a heterostructure based on n-Si (100) and zinc phthalocyanine (ZnPc) thin films which displays asymmetric current-voltage (I-V) characteristics under the applied voltage sweep. ZnPc thin films were deposited onto clean silicon wafers and quartz substrates through vacuum thermal evaporation technique. Spectroscopic techniques such as UV-visible, PL and FTIR were used in order to investigate the optical properties of the thin films. The α-phase of the as deposited ZnPc film was recognized from the positions and intensity of the peak in the visible region of UV-visible spectroscopy. Optical energy gap of the deposited ZnPc thin film was estimated from the Tauc’s plot and the result is compared with PL spectra. PL spectra show a strong peak located at around ∼ 392 nm, which corresponds to an energy of ∼ 3.13 eV. Microstructural properties of the thin film were studied by the X-ray diffraction which shows preferential orientation along (200) direction and a broad hump appears at around 2θ ∼ 30°. SEM and AFM images display uniform growth of ZnPc thin films, comprising spherical nanoparticles over the substrate surface. The surface RMS roughness of the thin film was estimated from AFM analysis and found to be around ∼ 5.3 nm. The room temperature electrical studies of the fabricated device (Al/n-Si (100)/ ZnPc/ Al) were performed which displays rectifying character in the positive sweep and electrical hysteresis at negative voltage sweep. A suitable energy band diagram is proposed to explain the electrical property of the heterojunction device.Herein, we report the electrical properties of a heterostructure based on n-Si (100) and zinc phthalocyanine (ZnPc) thin films which displays asymmetric current-voltage (I-V) characteristics under the applied voltage sweep. ZnPc thin films were deposited onto clean silicon wafers and quartz substrates through vacuum thermal evaporation technique. Spectroscopic techniques such as UV-visible, PL and FTIR were used in order to investigate the optical properties of the thin films. The α-phase of the as deposited ZnPc film was recognized from the positions and intensity of the peak in the visible region of UV-visible spectroscopy. Optical energy gap of the deposited ZnPc thin film was estimated from the Tauc’s plot and the result is compared with PL spectra. PL spectra show a strong peak located at around ∼ 392 nm, which corresponds to an energy of ∼ 3.13 eV. Microstructural properties of the thin film were studied by the X-ray diffraction which shows preferential orientation along (200) direction and a broad ...","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":"89736225","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}
Perovskite structures with the same crystal structure as CaTiO3, are of importance in the field of Materials Science right from the discovery of ceramic high-temperature superconductors to the organic–inorganic semiconductors for high-efficiency photovoltaics. Owing to their unique crystal structure, perovskites display a variety of interesting properties like ferroelectricity, superconductivity, magnetoresistance, birefringence, piezoelectricity etc. Moreover, the efficiency of perovskite solar cells has increased from 3.1% in 2009 to 22.1% in 2017. Since a large number of elements can be combined to form perovskite structures, one can selectively design and optimize perovskite’s physical, optical and electrical characteristics. Through theoretical and computational modelling, it is possible to access the hitherto unknown atomistic properties, opto-electronic properties and operational mechanisms of these materials with high accuracy. This paper aims at explaining some of the potentialities of DFT hybrid functionals to analyze the electronic, structural and optical properties of compounds constituting various layers of a perovskite solar cell with the help of software packages like VASP, Wien 2k. Gaussian 09 etc. This paper also reviews the effect of doping on the electronic properties of various layers of perovskite solar cells including the band gap, visible light absorption, relaxation time of holes and electrons using DFT, which in turn determines the optimum charge separation. The effect of introduction of an Intermediate Band Gap in the perovskite structure using DFT methods based on G0W0+SOC approach is also discussed here. A study on the effect of various intrinsic defects present in perovskite structures using DFT calculations with VASP package is also discussed. The relevance of modelling the interfaces of various layers of perovskite solar cells with DFT packages is discussed with the help of selected examples of materials and representative interfaces.
{"title":"A review on computational modelling of individual device components and interfaces of perovskite solar cells using DFT","authors":"Deepthi Jayan, V. Sebastian","doi":"10.1063/1.5130246","DOIUrl":"https://doi.org/10.1063/1.5130246","url":null,"abstract":"Perovskite structures with the same crystal structure as CaTiO3, are of importance in the field of Materials Science right from the discovery of ceramic high-temperature superconductors to the organic–inorganic semiconductors for high-efficiency photovoltaics. Owing to their unique crystal structure, perovskites display a variety of interesting properties like ferroelectricity, superconductivity, magnetoresistance, birefringence, piezoelectricity etc. Moreover, the efficiency of perovskite solar cells has increased from 3.1% in 2009 to 22.1% in 2017. Since a large number of elements can be combined to form perovskite structures, one can selectively design and optimize perovskite’s physical, optical and electrical characteristics. Through theoretical and computational modelling, it is possible to access the hitherto unknown atomistic properties, opto-electronic properties and operational mechanisms of these materials with high accuracy. This paper aims at explaining some of the potentialities of DFT hybrid functionals to analyze the electronic, structural and optical properties of compounds constituting various layers of a perovskite solar cell with the help of software packages like VASP, Wien 2k. Gaussian 09 etc. This paper also reviews the effect of doping on the electronic properties of various layers of perovskite solar cells including the band gap, visible light absorption, relaxation time of holes and electrons using DFT, which in turn determines the optimum charge separation. The effect of introduction of an Intermediate Band Gap in the perovskite structure using DFT methods based on G0W0+SOC approach is also discussed here. A study on the effect of various intrinsic defects present in perovskite structures using DFT calculations with VASP package is also discussed. The relevance of modelling the interfaces of various layers of perovskite solar cells with DFT packages is discussed with the help of selected examples of materials and representative interfaces.","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":"80373634","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}
Pinky Abraham, S. Renjini, T. Mary, V. Kumary, P. Chithra
In this work a novel and sensitive sensor for morphine (MO) based on electrochemically synthesized poly(p-aminobenzenesulfonicacid)/reduced grapheneoxide (poly(p-ABSA)/RGO) composite modified glassy carbon electrode was reported. The prepared composite was systematically characterized by various techniques like FT-IR, FESEM and EDX. The electrochemical response of morphine on this sensor was investigated in physiological pH 7.0 phosphate buffer solution by cyclic voltammetry and differential pulse voltammetry. The fabricated sensor provides a linear response in the range of 50 nM-80 µM with a detection limit of 47 nM for MO. In addition the sensor also provides good stability, repeatability and anti interference property.
{"title":"A novel voltammetric sensor for morphine detection based on electrochemically synthesized poly (p-aminobenzenesulfonicacid)/reduced graphene oxide composite","authors":"Pinky Abraham, S. Renjini, T. Mary, V. Kumary, P. Chithra","doi":"10.1063/1.5130268","DOIUrl":"https://doi.org/10.1063/1.5130268","url":null,"abstract":"In this work a novel and sensitive sensor for morphine (MO) based on electrochemically synthesized poly(p-aminobenzenesulfonicacid)/reduced grapheneoxide (poly(p-ABSA)/RGO) composite modified glassy carbon electrode was reported. The prepared composite was systematically characterized by various techniques like FT-IR, FESEM and EDX. The electrochemical response of morphine on this sensor was investigated in physiological pH 7.0 phosphate buffer solution by cyclic voltammetry and differential pulse voltammetry. The fabricated sensor provides a linear response in the range of 50 nM-80 µM with a detection limit of 47 nM for MO. In addition the sensor also provides good stability, repeatability and anti interference property.","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":"85586383","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 study covers the evaluation of color strength and color values of cotton fabrics dyed with Coralite blue FL-R reactive dye and treated with silver nanopartricles using spectrophotometer. The characterized silver nano particles are applied along with flurotriazine based reactive dyes (Coralite Blue FL-R) by exhaust dyeing method on cotton fabrics. The concentrations of silver nanoparticles were standardized for different ppm levels as per the silver nano material supplier’s standards. The dye bath was set with sodium carbonate (Na2 Co3) (20 gpl concentration) and sodium chloride (NaCL) (20gpl). Temperature and rate of dyeing was monitored at 80°C. The dyed fabric was soaped and washed after dyeing. Evaluation of the reactive dyed fabrics and their characterization studies showed the presence of silver nano-particles embedded on the substrate strongly. However, Silver nano-particles (AGNPs) when coupled with reactive dyes enhanced the overall fastness property of the fabrics. The color strength (K/S) values of AGNP treated fabrics were compared with untreated sample showing change in the reflective values and K/S values. In conclusion the color analysis of cotton fabrics dyed with coralite blue FL-R and treated with silver nanoparticles show difference in their color values when silver nano particle concentrations are varied.The present study covers the evaluation of color strength and color values of cotton fabrics dyed with Coralite blue FL-R reactive dye and treated with silver nanopartricles using spectrophotometer. The characterized silver nano particles are applied along with flurotriazine based reactive dyes (Coralite Blue FL-R) by exhaust dyeing method on cotton fabrics. The concentrations of silver nanoparticles were standardized for different ppm levels as per the silver nano material supplier’s standards. The dye bath was set with sodium carbonate (Na2 Co3) (20 gpl concentration) and sodium chloride (NaCL) (20gpl). Temperature and rate of dyeing was monitored at 80°C. The dyed fabric was soaped and washed after dyeing. Evaluation of the reactive dyed fabrics and their characterization studies showed the presence of silver nano-particles embedded on the substrate strongly. However, Silver nano-particles (AGNPs) when coupled with reactive dyes enhanced the overall fastness property of the fabrics. The color strength ...
本文研究了用纳米银粒子分光光度计对煤蓝FL-R活性染料染色后的棉织物的色强度和色值进行评价。将所表征的纳米银颗粒与氟三嗪基活性染料(Coralite Blue FL-R)一起用排气染色法对棉织物进行染色。根据银纳米材料供应商的标准，将银纳米颗粒的浓度标准化为不同的ppm水平。用浓度为20gpl的碳酸钠(na2co3)和浓度为20gpl的氯化钠(NaCL)配制染料浴。在80℃下监测染色温度和染色速率。染色织物染色后用肥皂洗净。对活性染色织物的评价和表征研究表明，纳米银颗粒强烈地嵌入在基体上。然而，银纳米粒子(AGNPs)与活性染料偶联时，提高了织物的整体牢度性能。将AGNP处理织物的颜色强度(K/S)值与未处理样品进行比较，显示反射值和K/S值的变化。综上所述，煤蓝FL-R染色棉织物与纳米银处理棉织物的颜色分析表明，纳米银浓度不同，棉织物的颜色值也不同。本文研究了用纳米银粒子分光光度计对煤蓝FL-R活性染料染色后的棉织物的色强度和色值进行评价。将所表征的纳米银颗粒与氟三嗪基活性染料(Coralite Blue FL-R)一起用排气染色法对棉织物进行染色。根据银纳米材料供应商的标准，将银纳米颗粒的浓度标准化为不同的ppm水平。用浓度为20gpl的碳酸钠(na2co3)和浓度为20gpl的氯化钠(NaCL)配制染料浴。在80℃下监测染色温度和染色速率。染色织物染色后用肥皂洗净。对活性染色织物的评价和表征研究表明，纳米银颗粒强烈地嵌入在基体上。然而，银纳米粒子(AGNPs)与活性染料偶联时，提高了织物的整体牢度性能。颜色强度…
{"title":"Evaluation of color strength (K/S) values of cotton fabrics dyed with reactive dye and treated with silver nanoparticles","authors":"G. Ramaiah, A. Ari","doi":"10.1063/1.5130321","DOIUrl":"https://doi.org/10.1063/1.5130321","url":null,"abstract":"The present study covers the evaluation of color strength and color values of cotton fabrics dyed with Coralite blue FL-R reactive dye and treated with silver nanopartricles using spectrophotometer. The characterized silver nano particles are applied along with flurotriazine based reactive dyes (Coralite Blue FL-R) by exhaust dyeing method on cotton fabrics. The concentrations of silver nanoparticles were standardized for different ppm levels as per the silver nano material supplier’s standards. The dye bath was set with sodium carbonate (Na2 Co3) (20 gpl concentration) and sodium chloride (NaCL) (20gpl). Temperature and rate of dyeing was monitored at 80°C. The dyed fabric was soaped and washed after dyeing. Evaluation of the reactive dyed fabrics and their characterization studies showed the presence of silver nano-particles embedded on the substrate strongly. However, Silver nano-particles (AGNPs) when coupled with reactive dyes enhanced the overall fastness property of the fabrics. The color strength (K/S) values of AGNP treated fabrics were compared with untreated sample showing change in the reflective values and K/S values. In conclusion the color analysis of cotton fabrics dyed with coralite blue FL-R and treated with silver nanoparticles show difference in their color values when silver nano particle concentrations are varied.The present study covers the evaluation of color strength and color values of cotton fabrics dyed with Coralite blue FL-R reactive dye and treated with silver nanopartricles using spectrophotometer. The characterized silver nano particles are applied along with flurotriazine based reactive dyes (Coralite Blue FL-R) by exhaust dyeing method on cotton fabrics. The concentrations of silver nanoparticles were standardized for different ppm levels as per the silver nano material supplier’s standards. The dye bath was set with sodium carbonate (Na2 Co3) (20 gpl concentration) and sodium chloride (NaCL) (20gpl). Temperature and rate of dyeing was monitored at 80°C. The dyed fabric was soaped and washed after dyeing. Evaluation of the reactive dyed fabrics and their characterization studies showed the presence of silver nano-particles embedded on the substrate strongly. However, Silver nano-particles (AGNPs) when coupled with reactive dyes enhanced the overall fastness property of the fabrics. The color strength ...","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":"91509827","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 Monte Carlo simulation method is now widely applied to materials science and engineering to the study of the kinetics of grain growth in two dimensions. This review Survey includes the grain growth kinetics, Grain Size and Grain Distribution by Monte Carlo simulation method. The initial distribution of orientations is chosen at random and the system evolves so as to reduce the number of nearest neighbor pairs of unlike crystallographic orientation. The temporal evolution of the microstructure is monitored to yield the time dependence of the size and shapes of the grains. A procedure incorporating the Metropolis algorithm which helps in developing the code for computer simulation is given as examples, two codes written using MATLAB software to simulate microstructure evolution using 2D ISING and POTTS Q-States Model would be demonstrated.The Monte Carlo simulation method is now widely applied to materials science and engineering to the study of the kinetics of grain growth in two dimensions. This review Survey includes the grain growth kinetics, Grain Size and Grain Distribution by Monte Carlo simulation method. The initial distribution of orientations is chosen at random and the system evolves so as to reduce the number of nearest neighbor pairs of unlike crystallographic orientation. The temporal evolution of the microstructure is monitored to yield the time dependence of the size and shapes of the grains. A procedure incorporating the Metropolis algorithm which helps in developing the code for computer simulation is given as examples, two codes written using MATLAB software to simulate microstructure evolution using 2D ISING and POTTS Q-States Model would be demonstrated.
{"title":"The Monte Carlo simulation of grain growth in polycrystalline material using Potts Q-state model-a perspective","authors":"P. Rajendra, K. Phaneesh","doi":"10.1063/1.5130215","DOIUrl":"https://doi.org/10.1063/1.5130215","url":null,"abstract":"The Monte Carlo simulation method is now widely applied to materials science and engineering to the study of the kinetics of grain growth in two dimensions. This review Survey includes the grain growth kinetics, Grain Size and Grain Distribution by Monte Carlo simulation method. The initial distribution of orientations is chosen at random and the system evolves so as to reduce the number of nearest neighbor pairs of unlike crystallographic orientation. The temporal evolution of the microstructure is monitored to yield the time dependence of the size and shapes of the grains. A procedure incorporating the Metropolis algorithm which helps in developing the code for computer simulation is given as examples, two codes written using MATLAB software to simulate microstructure evolution using 2D ISING and POTTS Q-States Model would be demonstrated.The Monte Carlo simulation method is now widely applied to materials science and engineering to the study of the kinetics of grain growth in two dimensions. This review Survey includes the grain growth kinetics, Grain Size and Grain Distribution by Monte Carlo simulation method. The initial distribution of orientations is chosen at random and the system evolves so as to reduce the number of nearest neighbor pairs of unlike crystallographic orientation. The temporal evolution of the microstructure is monitored to yield the time dependence of the size and shapes of the grains. A procedure incorporating the Metropolis algorithm which helps in developing the code for computer simulation is given as examples, two codes written using MATLAB software to simulate microstructure evolution using 2D ISING and POTTS Q-States Model would be demonstrated.","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":"91249195","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}
I-V-VI2 class of chalcopyrite acts as good absorbers for photovoltaic applications with its strong absorption in the visible region of solar spectra. AgSbSe2 is such a semiconducting material that can be used for photovoltaic applications. In the present work AgSbSe2 was prepared by annealing two different stacked layer structures glass/Sb2S3/Se/Ag and glass/Sb2Se3/Se/Ag at temperatures around 300°C. Deposition of Sb2S3, Sb2Se3 and Se films were carried out by the method of Chemical bath deposition. Ag layer was deposited using RF sputtering. Structural, morphological, chemical and optical characterization of the samples was done using XRD, SEM, EDAX and optical absorption studies respectively.I-V-VI2 class of chalcopyrite acts as good absorbers for photovoltaic applications with its strong absorption in the visible region of solar spectra. AgSbSe2 is such a semiconducting material that can be used for photovoltaic applications. In the present work AgSbSe2 was prepared by annealing two different stacked layer structures glass/Sb2S3/Se/Ag and glass/Sb2Se3/Se/Ag at temperatures around 300°C. Deposition of Sb2S3, Sb2Se3 and Se films were carried out by the method of Chemical bath deposition. Ag layer was deposited using RF sputtering. Structural, morphological, chemical and optical characterization of the samples was done using XRD, SEM, EDAX and optical absorption studies respectively.
{"title":"Preparation and characterization of silver antimony selenide thin film","authors":"A. Kuruvilla, Melda Francis, M. Lakshmi","doi":"10.1063/1.5130290","DOIUrl":"https://doi.org/10.1063/1.5130290","url":null,"abstract":"I-V-VI2 class of chalcopyrite acts as good absorbers for photovoltaic applications with its strong absorption in the visible region of solar spectra. AgSbSe2 is such a semiconducting material that can be used for photovoltaic applications. In the present work AgSbSe2 was prepared by annealing two different stacked layer structures glass/Sb2S3/Se/Ag and glass/Sb2Se3/Se/Ag at temperatures around 300°C. Deposition of Sb2S3, Sb2Se3 and Se films were carried out by the method of Chemical bath deposition. Ag layer was deposited using RF sputtering. Structural, morphological, chemical and optical characterization of the samples was done using XRD, SEM, EDAX and optical absorption studies respectively.I-V-VI2 class of chalcopyrite acts as good absorbers for photovoltaic applications with its strong absorption in the visible region of solar spectra. AgSbSe2 is such a semiconducting material that can be used for photovoltaic applications. In the present work AgSbSe2 was prepared by annealing two different stacked layer structures glass/Sb2S3/Se/Ag and glass/Sb2Se3/Se/Ag at temperatures around 300°C. Deposition of Sb2S3, Sb2Se3 and Se films were carried out by the method of Chemical bath deposition. Ag layer was deposited using RF sputtering. Structural, morphological, chemical and optical characterization of the samples was done using XRD, SEM, EDAX and optical absorption studies respectively.","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":"82626807","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}
Md. F. Abdullah, P. Pal, S. Patel, K. Chandrakanta, R. Jena, A. Singh
We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.
{"title":"Study of dielectric and magnetodielectric properties of Y-type Ba2Mg1.5Ni0.5Fe12O22 hexaferrite","authors":"Md. F. Abdullah, P. Pal, S. Patel, K. Chandrakanta, R. Jena, A. Singh","doi":"10.1063/1.5130368","DOIUrl":"https://doi.org/10.1063/1.5130368","url":null,"abstract":"We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.We have investigated dielectric and magnetodielectric (MD) properties of polycrystalline Y-type hexaferrite Ba2Mg1.5Ni0.5Fe12O22 (BMNF). Rietveld refinement of the X-ray diffraction pattern and hexagonal plate-like Field Emission Scanning Electron Microscope (FESEM) micrograph confirms the phase purity with the rhombohedral crystal structure (R-3m space group). Both temperatures dependent dielectric permittivity (e׳) and dielectric loss (tan δ) show an anomaly around 150°C and 290°C. The comparable value of activation energy extracted from impedance spectroscopy above 290°C between σg and σgb indicates that relaxation and conduction mechanism may be attributing to the same entities. Room temperature magnetodielectric (MD) measurement at 1MHz indicates the step like increase at ∼8 kOe in dielectric constant (e) with applied field but a reverse trend is observed for magneto-loss (ML) with step like feature preserving it nature.","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":"82148786","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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