Jasmine Thomas, T. Harsha, P. Anitha, Nygil Thomas
Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. Freundlich isotherm model shows the best fit to the equilibrium adsorption at all the studied experimental conditions. Adsorption kinetics was analyzed by pseudo-first order, pseudo-second order, and intra-particle diffusion kinetic models. It was found that methylene dye adsorption follows the pseudo second-order kinetics.Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. F...
{"title":"Ultrafast dye removal using capped TiO2 nanocrystallites","authors":"Jasmine Thomas, T. Harsha, P. Anitha, Nygil Thomas","doi":"10.1063/1.5130359","DOIUrl":"https://doi.org/10.1063/1.5130359","url":null,"abstract":"Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. Freundlich isotherm model shows the best fit to the equilibrium adsorption at all the studied experimental conditions. Adsorption kinetics was analyzed by pseudo-first order, pseudo-second order, and intra-particle diffusion kinetic models. It was found that methylene dye adsorption follows the pseudo second-order kinetics.Capped and uncapped TiO2 nanocrystallites of anatase phase were prepared via precipitation method. Oleic acid was used as an effective capping agent during precipitation. The synthesized TiO2 nano crystallites were characterized using PXRD, IR, and UV. The crystallite size calculated using Debye Scherrer equation indicated that the prepared materials are in nano size. Nano crystalline TiO2 was used as a dye adsorbent. It was found that the prepared nanocrystallites have excellent dye adsorption properties towards methylene blue (MB) dye. The effect of pH, contact time, initial dye concentration, and adsorbent dosage on the adsorption capacity was systematically investigated. It was found that nanocrystalline TiO2 could remove more than 95% dye concentration in 10 minutes. The dye adsorption capacity of capped TiO2 has been determined to be 300 mg g−1 at the initial solution pH of 10. Freundlich, Langmuir, and Dubnin-Radushkevich-Kaganer isotherm models were applied to investigate the adsorption process. F...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83537935","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 growth of a country entirely depends upon the industrialization expansion and agricultural production. Such industrial expansion also results ultimately in the accumulation of pollutants to a larger extend particularly in all segments of the environment. Among them, water pollution caused by textile dye industries contaminates the entire irrigational water stream. Hence it has become a challenging role for the technocrats and material science researchers to find an alternate solution to minimize the extent of pollution caused. Among many Conventional methods AOP (Advanced Oxidation Process) was chosen as an alternative method to treat polluted water. The aim of the present research work is to synthesize an azomethine polymer (PAZ) through polycondensation polymerization technique, semiconductor nanoparticles such as TiO2 through simple precipitation methodology and composite materials constitute of synthesized nanoparticles in polymeric resin such as TiO2 doped PAZ (PNT) through Ultrasonication method. The structural characterisation was justified using FTIR, XRD, EDAX TEM, and UV-DRS studies. The synthesized catalytic materials were used for the photodegradation of dyes such as Methyl Orange (MO) and Alizarin Red S (ARS). The parameters influencing the photodegradation of the dyes such as effect of initial dye solution concentration and period of contact required for the maximum dye removal were analyzed. The photocatalyic nature of the semiconductor nanomaterials and polymeric nanocomposite obeyed the application of Langmuir-Hinshellwood (L-H) kinetic model. The synthesized catalyst materials were found to be stable even upto 5 cycles without losing its catalytic nature.The growth of a country entirely depends upon the industrialization expansion and agricultural production. Such industrial expansion also results ultimately in the accumulation of pollutants to a larger extend particularly in all segments of the environment. Among them, water pollution caused by textile dye industries contaminates the entire irrigational water stream. Hence it has become a challenging role for the technocrats and material science researchers to find an alternate solution to minimize the extent of pollution caused. Among many Conventional methods AOP (Advanced Oxidation Process) was chosen as an alternative method to treat polluted water. The aim of the present research work is to synthesize an azomethine polymer (PAZ) through polycondensation polymerization technique, semiconductor nanoparticles such as TiO2 through simple precipitation methodology and composite materials constitute of synthesized nanoparticles in polymeric resin such as TiO2 doped PAZ (PNT) through Ultrasonication method...
{"title":"Photodegradation efficiency of methyl orange and Alizarin Red S in waste water using poly(azomethine)/TiO2 nanocomposite","authors":"S. Pradeeba, K. Sampath","doi":"10.1063/1.5130238","DOIUrl":"https://doi.org/10.1063/1.5130238","url":null,"abstract":"The growth of a country entirely depends upon the industrialization expansion and agricultural production. Such industrial expansion also results ultimately in the accumulation of pollutants to a larger extend particularly in all segments of the environment. Among them, water pollution caused by textile dye industries contaminates the entire irrigational water stream. Hence it has become a challenging role for the technocrats and material science researchers to find an alternate solution to minimize the extent of pollution caused. Among many Conventional methods AOP (Advanced Oxidation Process) was chosen as an alternative method to treat polluted water. The aim of the present research work is to synthesize an azomethine polymer (PAZ) through polycondensation polymerization technique, semiconductor nanoparticles such as TiO2 through simple precipitation methodology and composite materials constitute of synthesized nanoparticles in polymeric resin such as TiO2 doped PAZ (PNT) through Ultrasonication method. The structural characterisation was justified using FTIR, XRD, EDAX TEM, and UV-DRS studies. The synthesized catalytic materials were used for the photodegradation of dyes such as Methyl Orange (MO) and Alizarin Red S (ARS). The parameters influencing the photodegradation of the dyes such as effect of initial dye solution concentration and period of contact required for the maximum dye removal were analyzed. The photocatalyic nature of the semiconductor nanomaterials and polymeric nanocomposite obeyed the application of Langmuir-Hinshellwood (L-H) kinetic model. The synthesized catalyst materials were found to be stable even upto 5 cycles without losing its catalytic nature.The growth of a country entirely depends upon the industrialization expansion and agricultural production. Such industrial expansion also results ultimately in the accumulation of pollutants to a larger extend particularly in all segments of the environment. Among them, water pollution caused by textile dye industries contaminates the entire irrigational water stream. Hence it has become a challenging role for the technocrats and material science researchers to find an alternate solution to minimize the extent of pollution caused. Among many Conventional methods AOP (Advanced Oxidation Process) was chosen as an alternative method to treat polluted water. The aim of the present research work is to synthesize an azomethine polymer (PAZ) through polycondensation polymerization technique, semiconductor nanoparticles such as TiO2 through simple precipitation methodology and composite materials constitute of synthesized nanoparticles in polymeric resin such as TiO2 doped PAZ (PNT) through Ultrasonication method...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86404105","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}
K. C. Sekhar, G. Rao, B. S. Chary, A. Phani, V. Sathe, N. Narsimlu, M. Shareefuddin
Glasses with xPbX·(30-x)PbO·70B2O3 composition (where X=F2, CI2 and Br2) have been prepared and investigated by Raman spectroscopy with a view to understand the effect of PbO as modifier. The micro Raman spectrum was recorded on Raman spectrometer at room temperature. At high PbO content, Pb enters the glass network as network former, the present investigation deals with modifier role of PbO at low concentration. The measured density values are increasing with increase of PbF2 content which is due to replacement of relatively lower ionic radii of fluorine ions (1.33A) with oxygen ions (1.4A) and decreasing with PbCl2/PbBr2 content which is attributed to replacement of higher ionic radii of chlorine (1.81A)/bromide (1.96A) ions with lower ionic radii of oxygen ions (1.4A). Deconvoluted Raman spectra are used to extract exact band positions. The band positions unveiled that the glass structure is mainly based on trigonal and tetragonal borate units placed in various structural groups. Low concentration of PbO in glass resulted in conversion of boroxol rings into several borate groups, symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4- tetrahedral. Raman spectra confirm the presence of Pb ions exists mainly as PbO4 groups.
{"title":"Raman study on lead halo borate glasses: Effect of PbO as modifier","authors":"K. C. Sekhar, G. Rao, B. S. Chary, A. Phani, V. Sathe, N. Narsimlu, M. Shareefuddin","doi":"10.1063/1.5130354","DOIUrl":"https://doi.org/10.1063/1.5130354","url":null,"abstract":"Glasses with xPbX·(30-x)PbO·70B2O3 composition (where X=F2, CI2 and Br2) have been prepared and investigated by Raman spectroscopy with a view to understand the effect of PbO as modifier. The micro Raman spectrum was recorded on Raman spectrometer at room temperature. At high PbO content, Pb enters the glass network as network former, the present investigation deals with modifier role of PbO at low concentration. The measured density values are increasing with increase of PbF2 content which is due to replacement of relatively lower ionic radii of fluorine ions (1.33A) with oxygen ions (1.4A) and decreasing with PbCl2/PbBr2 content which is attributed to replacement of higher ionic radii of chlorine (1.81A)/bromide (1.96A) ions with lower ionic radii of oxygen ions (1.4A). Deconvoluted Raman spectra are used to extract exact band positions. The band positions unveiled that the glass structure is mainly based on trigonal and tetragonal borate units placed in various structural groups. Low concentration of PbO in glass resulted in conversion of boroxol rings into several borate groups, symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4- tetrahedral. Raman spectra confirm the presence of Pb ions exists mainly as PbO4 groups.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89297270","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}
Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growth of the nanoparticles. The particle size is determined from plasmon resonance using Mie theory.Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growt...
{"title":"Sunlight-induced honey-mediated green synthesis of silver nanoparticles","authors":"G. Madhu, Anuj Kumar, S. K. Nair","doi":"10.1063/1.5130311","DOIUrl":"https://doi.org/10.1063/1.5130311","url":null,"abstract":"Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growth of the nanoparticles. The particle size is determined from plasmon resonance using Mie theory.Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growt...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"71 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77477890","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. Akshay, V. Senan, K. S. V. Surej, B. Akhil, K. V. Shankar, B. Shankar
This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.
{"title":"Determination on the effect of Ti addition on the mechanical behavior of as-cast Cu-6Sn alloy","authors":"M. Akshay, V. Senan, K. S. V. Surej, B. Akhil, K. V. Shankar, B. Shankar","doi":"10.1063/1.5130228","DOIUrl":"https://doi.org/10.1063/1.5130228","url":null,"abstract":"This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74581083","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}
Steffy Maria Jose, C. T. Mathew, Sam Solaman, J. K. Thomas
Synthesis of high-quality nanostructured Yttria/Ceria (Y2O3/CeO2) nanocomposite and the effect of ceria in reinforcing the properties of yttria are presented in the paper. The ultrafine starting powder is synthesized by a single step modified combustion technique and its green pellet is densified by a microwave sintering technique. The as-synthesized sample is characterized using X-ray diffraction (XRD) for determining the crystalline structure. All the peaks were indexed for a cubic structure of Y2O3 (ICDD: 89-5591) and CeO2 (ICDD: 81-0792). The crystallite size calculated for the highest peak (222) using the Debye-Scherrer equation is 24.05 nm. The crystallite sizes are in the range of 16-25 nm. The structural properties of the combustion product are examined by high-resolution transmission electron microscopy (HRTEM). Phase purity is ascertained by FTIR spectroscopy. The optical transmittance is examined by UV-Visible spectroscopy. The sample shows a band gap of 3.42 eV and a high refractive index of 2.36. The theoretical transmittance in the UV-Visible range is 71.8%. The nanopowder is compacted to pellets by hydraulic pressing and densified to 99.5 % of theoretical density at 1450 0C with a ramp rate of 200C/min for a soaking duration of 30 min which is better compared to pure yttria. The morphological investigations are done using field emission scanning electron microscopy (FESEM). The properties show that the sample can be effectively used to fabricate infrared transparent ceramic material.Synthesis of high-quality nanostructured Yttria/Ceria (Y2O3/CeO2) nanocomposite and the effect of ceria in reinforcing the properties of yttria are presented in the paper. The ultrafine starting powder is synthesized by a single step modified combustion technique and its green pellet is densified by a microwave sintering technique. The as-synthesized sample is characterized using X-ray diffraction (XRD) for determining the crystalline structure. All the peaks were indexed for a cubic structure of Y2O3 (ICDD: 89-5591) and CeO2 (ICDD: 81-0792). The crystallite size calculated for the highest peak (222) using the Debye-Scherrer equation is 24.05 nm. The crystallite sizes are in the range of 16-25 nm. The structural properties of the combustion product are examined by high-resolution transmission electron microscopy (HRTEM). Phase purity is ascertained by FTIR spectroscopy. The optical transmittance is examined by UV-Visible spectroscopy. The sample shows a band gap of 3.42 eV and a high refractive index of 2...
{"title":"Effect of cerium oxide in reinforcing the properties and densification of yttria ceramics","authors":"Steffy Maria Jose, C. T. Mathew, Sam Solaman, J. K. Thomas","doi":"10.1063/1.5130363","DOIUrl":"https://doi.org/10.1063/1.5130363","url":null,"abstract":"Synthesis of high-quality nanostructured Yttria/Ceria (Y2O3/CeO2) nanocomposite and the effect of ceria in reinforcing the properties of yttria are presented in the paper. The ultrafine starting powder is synthesized by a single step modified combustion technique and its green pellet is densified by a microwave sintering technique. The as-synthesized sample is characterized using X-ray diffraction (XRD) for determining the crystalline structure. All the peaks were indexed for a cubic structure of Y2O3 (ICDD: 89-5591) and CeO2 (ICDD: 81-0792). The crystallite size calculated for the highest peak (222) using the Debye-Scherrer equation is 24.05 nm. The crystallite sizes are in the range of 16-25 nm. The structural properties of the combustion product are examined by high-resolution transmission electron microscopy (HRTEM). Phase purity is ascertained by FTIR spectroscopy. The optical transmittance is examined by UV-Visible spectroscopy. The sample shows a band gap of 3.42 eV and a high refractive index of 2.36. The theoretical transmittance in the UV-Visible range is 71.8%. The nanopowder is compacted to pellets by hydraulic pressing and densified to 99.5 % of theoretical density at 1450 0C with a ramp rate of 200C/min for a soaking duration of 30 min which is better compared to pure yttria. The morphological investigations are done using field emission scanning electron microscopy (FESEM). The properties show that the sample can be effectively used to fabricate infrared transparent ceramic material.Synthesis of high-quality nanostructured Yttria/Ceria (Y2O3/CeO2) nanocomposite and the effect of ceria in reinforcing the properties of yttria are presented in the paper. The ultrafine starting powder is synthesized by a single step modified combustion technique and its green pellet is densified by a microwave sintering technique. The as-synthesized sample is characterized using X-ray diffraction (XRD) for determining the crystalline structure. All the peaks were indexed for a cubic structure of Y2O3 (ICDD: 89-5591) and CeO2 (ICDD: 81-0792). The crystallite size calculated for the highest peak (222) using the Debye-Scherrer equation is 24.05 nm. The crystallite sizes are in the range of 16-25 nm. The structural properties of the combustion product are examined by high-resolution transmission electron microscopy (HRTEM). Phase purity is ascertained by FTIR spectroscopy. The optical transmittance is examined by UV-Visible spectroscopy. The sample shows a band gap of 3.42 eV and a high refractive index of 2...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90956713","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}
Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical property of the compounds was investigated by kurtz-perry powder technique which through a light on the materialistic properties of the ruthenium complexes.Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical p...
{"title":"Synthesis, characterization and NLO property of ruthenium(II) thiosemicarbazone complexes","authors":"K. Sampath, S. Krithika","doi":"10.1063/1.5130328","DOIUrl":"https://doi.org/10.1063/1.5130328","url":null,"abstract":"Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical property of the compounds was investigated by kurtz-perry powder technique which through a light on the materialistic properties of the ruthenium complexes.Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical p...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87206289","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. U. Kumar, R. Swetha, M. Murugendrappa, L. Kumari
Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.
{"title":"Effect of Sn doping at Sb sites on the structural and optical properties of Co2Sb6 nanostructures","authors":"M. U. Kumar, R. Swetha, M. Murugendrappa, L. Kumari","doi":"10.1063/1.5130264","DOIUrl":"https://doi.org/10.1063/1.5130264","url":null,"abstract":"Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82786755","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}
Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ZnO nanorods are promising candidate for hexane sensor.Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ...
{"title":"ZnO nanorods based fiber optic hexane sensor","authors":"S. Narasimman, L. Balakrishnan, Z. C. Alex","doi":"10.1063/1.5130315","DOIUrl":"https://doi.org/10.1063/1.5130315","url":null,"abstract":"Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ZnO nanorods are promising candidate for hexane sensor.Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"22 6S 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76524246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Sreekrishnan, S. Karthika, N. S. Roshima, V. Rakhesh
Tin oxide (SnO2) thin films are widely used in optoelectronic devices and solar cells as transparent conducting electrodes. The performance of such devices highly depends on the conductivity of tin oxide electrodes without compromising on the transmission in the desired optical region. So it is important to improve the conductivity of tin oxide thin films used as electrodes. In this work, the electrical and structural properties of SnO2 films deposited on glass substrates by Successive Ionic Layer Adsorption and Reaction (SILAR) and Spin methodology at room temperature is reported. By spin coating, the samples were deposited on glass substrates using Tin chloride in ethanol as the precursor at 1200rpm, at different concentrations. The deposited samples were annealed at 450°C for different annealing times. By the same time SnO2 films deposited on glass substrates by SILAR method using tin chloride in distilled water as the starting solution for different concentration. The samples obtained after deposition were annealed 450°C for 2 hours. Electrical conductivity measurements were done for the samples deposited by both methods and I-V characteristics for the films are plotted. For both methods, the sample prepared at 0.1M concentration and annealed for 2hrs at 450°C showed maximum conductivity retaining good transmission. And also it was found that the sample prepared by SILAR method showed least sheet resistance of the order of 141kΩ. The thickness of the optimised films were determined using Ellipsometry and was found to be 263nm. The structural features of the samples were analysed using X-ray diffraction and Fourier transform Infrared spectroscopy. The XRD analysis revealed that the optimised samples have peaks comparable with the standard tin oxide data and is closer for the samples deposited by spin coating method. The FTIR analysis also suggested absorption corresponding to standard absorption peaks of crystalline Tin Oxide. It is found that SILAR is a better method for film deposition as it could attain small thickness with better conductivity.Tin oxide (SnO2) thin films are widely used in optoelectronic devices and solar cells as transparent conducting electrodes. The performance of such devices highly depends on the conductivity of tin oxide electrodes without compromising on the transmission in the desired optical region. So it is important to improve the conductivity of tin oxide thin films used as electrodes. In this work, the electrical and structural properties of SnO2 films deposited on glass substrates by Successive Ionic Layer Adsorption and Reaction (SILAR) and Spin methodology at room temperature is reported. By spin coating, the samples were deposited on glass substrates using Tin chloride in ethanol as the precursor at 1200rpm, at different concentrations. The deposited samples were annealed at 450°C for different annealing times. By the same time SnO2 films deposited on glass substrates by SILAR method using tin chloride in d
{"title":"Structural and electrical properties of tin oxide films deposited by SILAR and spin coating techniques","authors":"R. Sreekrishnan, S. Karthika, N. S. Roshima, V. Rakhesh","doi":"10.1063/1.5130347","DOIUrl":"https://doi.org/10.1063/1.5130347","url":null,"abstract":"Tin oxide (SnO2) thin films are widely used in optoelectronic devices and solar cells as transparent conducting electrodes. The performance of such devices highly depends on the conductivity of tin oxide electrodes without compromising on the transmission in the desired optical region. So it is important to improve the conductivity of tin oxide thin films used as electrodes. In this work, the electrical and structural properties of SnO2 films deposited on glass substrates by Successive Ionic Layer Adsorption and Reaction (SILAR) and Spin methodology at room temperature is reported. By spin coating, the samples were deposited on glass substrates using Tin chloride in ethanol as the precursor at 1200rpm, at different concentrations. The deposited samples were annealed at 450°C for different annealing times. By the same time SnO2 films deposited on glass substrates by SILAR method using tin chloride in distilled water as the starting solution for different concentration. The samples obtained after deposition were annealed 450°C for 2 hours. Electrical conductivity measurements were done for the samples deposited by both methods and I-V characteristics for the films are plotted. For both methods, the sample prepared at 0.1M concentration and annealed for 2hrs at 450°C showed maximum conductivity retaining good transmission. And also it was found that the sample prepared by SILAR method showed least sheet resistance of the order of 141kΩ. The thickness of the optimised films were determined using Ellipsometry and was found to be 263nm. The structural features of the samples were analysed using X-ray diffraction and Fourier transform Infrared spectroscopy. The XRD analysis revealed that the optimised samples have peaks comparable with the standard tin oxide data and is closer for the samples deposited by spin coating method. The FTIR analysis also suggested absorption corresponding to standard absorption peaks of crystalline Tin Oxide. It is found that SILAR is a better method for film deposition as it could attain small thickness with better conductivity.Tin oxide (SnO2) thin films are widely used in optoelectronic devices and solar cells as transparent conducting electrodes. The performance of such devices highly depends on the conductivity of tin oxide electrodes without compromising on the transmission in the desired optical region. So it is important to improve the conductivity of tin oxide thin films used as electrodes. In this work, the electrical and structural properties of SnO2 films deposited on glass substrates by Successive Ionic Layer Adsorption and Reaction (SILAR) and Spin methodology at room temperature is reported. By spin coating, the samples were deposited on glass substrates using Tin chloride in ethanol as the precursor at 1200rpm, at different concentrations. The deposited samples were annealed at 450°C for different annealing times. By the same time SnO2 films deposited on glass substrates by SILAR method using tin chloride in d","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"160 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80109505","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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