Cerium substituted cobalt ferrite nanoparticles with composition formula, CoFe2-xCexO4 (x= 0.00, 0.075) have been synthesized by Sol-gel route method to study structural, morphological, dielectric and magnetic properties. XRD revealed the spinel structure of synthesized samples. An increase in specific surface area and decrease in crystallite were observed with increasing cerium concentrations. The SEM micrographs revealed some kind of agglomerations and non-uniform grain distributions. To confirmed the stoichiometry of the samples EDAX has been employed. Dielectric constant, dielectric loss at room temperature found decreased with increasing frequency showing a normal dielectric dispersion of ferrites. MS and HC were found decreased due to substitution of cerium ions which can be attributed to weakening of A-B interaction, decrease in particle size and surface effect. The MS and HC can be tailored for the application of nano cobalt ferrite particles in high density recording media.Cerium substituted cobalt ferrite nanoparticles with composition formula, CoFe2-xCexO4 (x= 0.00, 0.075) have been synthesized by Sol-gel route method to study structural, morphological, dielectric and magnetic properties. XRD revealed the spinel structure of synthesized samples. An increase in specific surface area and decrease in crystallite were observed with increasing cerium concentrations. The SEM micrographs revealed some kind of agglomerations and non-uniform grain distributions. To confirmed the stoichiometry of the samples EDAX has been employed. Dielectric constant, dielectric loss at room temperature found decreased with increasing frequency showing a normal dielectric dispersion of ferrites. MS and HC were found decreased due to substitution of cerium ions which can be attributed to weakening of A-B interaction, decrease in particle size and surface effect. The MS and HC can be tailored for the application of nano cobalt ferrite particles in high density recording media.
{"title":"Structural, morphological, dielectric and room-temperature magnetic studies of Ce3+ substituted nano crystalline cobalt ferrite","authors":"Syed Ismail Ahmad, M. B. Suresh, D. R. Kumar","doi":"10.1063/1.5130295","DOIUrl":"https://doi.org/10.1063/1.5130295","url":null,"abstract":"Cerium substituted cobalt ferrite nanoparticles with composition formula, CoFe2-xCexO4 (x= 0.00, 0.075) have been synthesized by Sol-gel route method to study structural, morphological, dielectric and magnetic properties. XRD revealed the spinel structure of synthesized samples. An increase in specific surface area and decrease in crystallite were observed with increasing cerium concentrations. The SEM micrographs revealed some kind of agglomerations and non-uniform grain distributions. To confirmed the stoichiometry of the samples EDAX has been employed. Dielectric constant, dielectric loss at room temperature found decreased with increasing frequency showing a normal dielectric dispersion of ferrites. MS and HC were found decreased due to substitution of cerium ions which can be attributed to weakening of A-B interaction, decrease in particle size and surface effect. The MS and HC can be tailored for the application of nano cobalt ferrite particles in high density recording media.Cerium substituted cobalt ferrite nanoparticles with composition formula, CoFe2-xCexO4 (x= 0.00, 0.075) have been synthesized by Sol-gel route method to study structural, morphological, dielectric and magnetic properties. XRD revealed the spinel structure of synthesized samples. An increase in specific surface area and decrease in crystallite were observed with increasing cerium concentrations. The SEM micrographs revealed some kind of agglomerations and non-uniform grain distributions. To confirmed the stoichiometry of the samples EDAX has been employed. Dielectric constant, dielectric loss at room temperature found decreased with increasing frequency showing a normal dielectric dispersion of ferrites. MS and HC were found decreased due to substitution of cerium ions which can be attributed to weakening of A-B interaction, decrease in particle size and surface effect. The MS and HC can be tailored for the application of nano cobalt ferrite particles in high density recording media.","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":"90977523","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}
Polyaniline emeraldine base-chitin nanocomposites have been prepared by solution casting technique. Polyaniline self-assembled nanofibers (PANF) with an average diameter of 62nm were synthesized by direct mixed oxidation performed in aqueous hydrochloric acid in the presence of ammonium peroxodisulfate as oxidant. Dedoped polyaniline nanofibers were homogeneously dispersed in the 5% LiCl/ N,N-dimethylacetamide and then mixed with chitin solution made in the 5% LiCl/ N,N-dimethylacetamide solvent system according to predetermined weight ratios. The characterizations of the composites were done by Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Impedance spectroscopy (100 Hz−10 MHz) at room temperature. The real and imaginary part of dielectric permittivity is observed to decrease with an increase in frequency and explained on the basis of Maxwell-Wanger-Sillars polarization. Frequency-dependent conductivity of prepared composites was found to increase with the increase of frequency because at higher frequency space charge polarization effect decreases and hence the ionic mobility increases.Polyaniline emeraldine base-chitin nanocomposites have been prepared by solution casting technique. Polyaniline self-assembled nanofibers (PANF) with an average diameter of 62nm were synthesized by direct mixed oxidation performed in aqueous hydrochloric acid in the presence of ammonium peroxodisulfate as oxidant. Dedoped polyaniline nanofibers were homogeneously dispersed in the 5% LiCl/ N,N-dimethylacetamide and then mixed with chitin solution made in the 5% LiCl/ N,N-dimethylacetamide solvent system according to predetermined weight ratios. The characterizations of the composites were done by Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Impedance spectroscopy (100 Hz−10 MHz) at room temperature. The real and imaginary part of dielectric permittivity is observed to decrease with an increase in frequency and explained on the basis of Maxwell-Wanger-Sillars polarization. Frequency-dependent conductivity of prepared composites was found to increase...
{"title":"Dielectric behavior and AC conductivity of low loaded polyaniline emeraldine base - Biopolymer nanocomposite","authors":"P. Praveen, M. Pattabi, Rani M. Pattabi, V. Rao","doi":"10.1063/1.5130240","DOIUrl":"https://doi.org/10.1063/1.5130240","url":null,"abstract":"Polyaniline emeraldine base-chitin nanocomposites have been prepared by solution casting technique. Polyaniline self-assembled nanofibers (PANF) with an average diameter of 62nm were synthesized by direct mixed oxidation performed in aqueous hydrochloric acid in the presence of ammonium peroxodisulfate as oxidant. Dedoped polyaniline nanofibers were homogeneously dispersed in the 5% LiCl/ N,N-dimethylacetamide and then mixed with chitin solution made in the 5% LiCl/ N,N-dimethylacetamide solvent system according to predetermined weight ratios. The characterizations of the composites were done by Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Impedance spectroscopy (100 Hz−10 MHz) at room temperature. The real and imaginary part of dielectric permittivity is observed to decrease with an increase in frequency and explained on the basis of Maxwell-Wanger-Sillars polarization. Frequency-dependent conductivity of prepared composites was found to increase with the increase of frequency because at higher frequency space charge polarization effect decreases and hence the ionic mobility increases.Polyaniline emeraldine base-chitin nanocomposites have been prepared by solution casting technique. Polyaniline self-assembled nanofibers (PANF) with an average diameter of 62nm were synthesized by direct mixed oxidation performed in aqueous hydrochloric acid in the presence of ammonium peroxodisulfate as oxidant. Dedoped polyaniline nanofibers were homogeneously dispersed in the 5% LiCl/ N,N-dimethylacetamide and then mixed with chitin solution made in the 5% LiCl/ N,N-dimethylacetamide solvent system according to predetermined weight ratios. The characterizations of the composites were done by Fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Impedance spectroscopy (100 Hz−10 MHz) at room temperature. The real and imaginary part of dielectric permittivity is observed to decrease with an increase in frequency and explained on the basis of Maxwell-Wanger-Sillars polarization. Frequency-dependent conductivity of prepared composites was found to increase...","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":"86220950","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. Jothibas, A. Muthuvel, K. Senthilkannan, V. Mohana
Pure and Ag doped ZnO-NPs were synthesized through a facile Sol-Gel methods. The structural, morphological and photocalaytic activity of the nanoparticles were studied with respect to pure and Ag doped ZnO nanoparticles. XRD result is monodyspersed hexagonal wurtzite structure with an average crystallite size varied from 3.20 to 2.06nm. The TEM images showed ZnO-NPs with spherical shapes, the Raman spectra measurements indicated that the pure and Ag doped ZnO-NPs had a high crystalline quality. The performance and stability of the Ag doped ZnO-NPs, for the photocatalytic degradation of Methylene Blue under sun light irradiation evaluated.
{"title":"Structural, optical and photocatatic activity of Ag doped ZnO nanoparticles obtained by sol-gel method","authors":"M. Jothibas, A. Muthuvel, K. Senthilkannan, V. Mohana","doi":"10.1063/1.5130361","DOIUrl":"https://doi.org/10.1063/1.5130361","url":null,"abstract":"Pure and Ag doped ZnO-NPs were synthesized through a facile Sol-Gel methods. The structural, morphological and photocalaytic activity of the nanoparticles were studied with respect to pure and Ag doped ZnO nanoparticles. XRD result is monodyspersed hexagonal wurtzite structure with an average crystallite size varied from 3.20 to 2.06nm. The TEM images showed ZnO-NPs with spherical shapes, the Raman spectra measurements indicated that the pure and Ag doped ZnO-NPs had a high crystalline quality. The performance and stability of the Ag doped ZnO-NPs, for the photocatalytic degradation of Methylene Blue under sun light irradiation evaluated.","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":"90269751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the paper porous polymeric materials recently obtained from norbornene derivatives are presented. Up to now three groups of polynorbornenes exhibited the presence of micro-either mesopores and large surface area are considered. The first one is the group of Me3Si-containing addition polynorbornenes. These polymers are microporous and possess Brunauer-Emmett-Teller (BET) surface area up to 800 m2/g. The second group includes polynorbornenes with carbocycles in the side polymer chains. Up to now, only polydicyclopentadiene is reported as porous material from this group. The third group includes polymers based on bifunctional norbornenes. These polymers have demonstrated tunable porous properties and large BET surface area up to 1000 m2/g.In the paper porous polymeric materials recently obtained from norbornene derivatives are presented. Up to now three groups of polynorbornenes exhibited the presence of micro-either mesopores and large surface area are considered. The first one is the group of Me3Si-containing addition polynorbornenes. These polymers are microporous and possess Brunauer-Emmett-Teller (BET) surface area up to 800 m2/g. The second group includes polynorbornenes with carbocycles in the side polymer chains. Up to now, only polydicyclopentadiene is reported as porous material from this group. The third group includes polymers based on bifunctional norbornenes. These polymers have demonstrated tunable porous properties and large BET surface area up to 1000 m2/g.
{"title":"Porous polymers from norbornene derivatives","authors":"D. Alentiev, M. Bermeshev","doi":"10.1063/1.5130360","DOIUrl":"https://doi.org/10.1063/1.5130360","url":null,"abstract":"In the paper porous polymeric materials recently obtained from norbornene derivatives are presented. Up to now three groups of polynorbornenes exhibited the presence of micro-either mesopores and large surface area are considered. The first one is the group of Me3Si-containing addition polynorbornenes. These polymers are microporous and possess Brunauer-Emmett-Teller (BET) surface area up to 800 m2/g. The second group includes polynorbornenes with carbocycles in the side polymer chains. Up to now, only polydicyclopentadiene is reported as porous material from this group. The third group includes polymers based on bifunctional norbornenes. These polymers have demonstrated tunable porous properties and large BET surface area up to 1000 m2/g.In the paper porous polymeric materials recently obtained from norbornene derivatives are presented. Up to now three groups of polynorbornenes exhibited the presence of micro-either mesopores and large surface area are considered. The first one is the group of Me3Si-containing addition polynorbornenes. These polymers are microporous and possess Brunauer-Emmett-Teller (BET) surface area up to 800 m2/g. The second group includes polynorbornenes with carbocycles in the side polymer chains. Up to now, only polydicyclopentadiene is reported as porous material from this group. The third group includes polymers based on bifunctional norbornenes. These polymers have demonstrated tunable porous properties and large BET surface area up to 1000 m2/g.","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":"81882691","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}
Rare-earth (RE) with metal nanoparticle (NPs) doped glasses greatly contribute to enhancement in visible and NIR emission of the RE ions due to local surface plasmon resonance (SPR). The germinates tungsten tellurite glasses composition of TeO2−GeO2−Li2O-WO3−Yb2O3−Tm2O3− xAu(NO3)3−yAgNO3 with (x= 0.03-0.3 and y=0.006 mol%) - nanoparticles embedded glasses using melt quenching technique have been synthesized and reheated 10hrs for the growth of core-shell bimetallic (Au0−Ag0) nanoparticles in glasses. The absorption spectrum of Tm3+ in germinates tellurite glass containing (Au0 −Ag0) nanoparticles shows peaks from ground state (3H6) variation near 400-540nm due to SPR bands. Also,upconversion emission enhancement in 653nm red (1G4→3H6) has been observed at 980nm excitation at room temperature and enhancement is found to be about ∼2 folds due to SPR. The Confocal fluorescence was used to observe the image of fluorescence of Ag-Au NPs core-shell in the glass under 488nm laser excitation. On doping percentage of Au and Ag for the formation of core-shell glass,samples are attributed to maximum enhancement due to the local field on the Tm3+ ions locations and explained by the energy transfer mechanism. Results show that core-shell Au- Ag NPs play a significant role in enhancement red emission of Tm3+ ions and this hybrid-nano composite may be used for laser-based applications.
{"title":"Upconversion emission of Tm3+ doped germinate tellurite glasses with Au-Ag core-shell nanoparticles","authors":"S. K. Mahajan, Ghizal F. Ansari","doi":"10.1063/1.5130370","DOIUrl":"https://doi.org/10.1063/1.5130370","url":null,"abstract":"Rare-earth (RE) with metal nanoparticle (NPs) doped glasses greatly contribute to enhancement in visible and NIR emission of the RE ions due to local surface plasmon resonance (SPR). The germinates tungsten tellurite glasses composition of TeO2−GeO2−Li2O-WO3−Yb2O3−Tm2O3− xAu(NO3)3−yAgNO3 with (x= 0.03-0.3 and y=0.006 mol%) - nanoparticles embedded glasses using melt quenching technique have been synthesized and reheated 10hrs for the growth of core-shell bimetallic (Au0−Ag0) nanoparticles in glasses. The absorption spectrum of Tm3+ in germinates tellurite glass containing (Au0 −Ag0) nanoparticles shows peaks from ground state (3H6) variation near 400-540nm due to SPR bands. Also,upconversion emission enhancement in 653nm red (1G4→3H6) has been observed at 980nm excitation at room temperature and enhancement is found to be about ∼2 folds due to SPR. The Confocal fluorescence was used to observe the image of fluorescence of Ag-Au NPs core-shell in the glass under 488nm laser excitation. On doping percentage of Au and Ag for the formation of core-shell glass,samples are attributed to maximum enhancement due to the local field on the Tm3+ ions locations and explained by the energy transfer mechanism. Results show that core-shell Au- Ag NPs play a significant role in enhancement red emission of Tm3+ ions and this hybrid-nano composite may be used for laser-based applications.","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":"78582035","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}
Present work mainly deals with the bending analysis of inter-ply hybrid composite plate which is made by the combination of one natural and two synthetic unidirectional fabrics and epoxy resin. Finite element method is used to predict the bending behavior of composite plate with [(0/90)3]S, [(45/-45)3]S,[(30/-60)3]S symmetrical and [(0/90)3]US, [(45/-45)3]US, [(30/-60)3]US un-symmetrical ply orientation and FCA, FAC, CFA, CAF, AFC and ACF ply sequence (order). M odelling and analysis of composite plate are performed in ANSYS 16.0 software to determine the best ply orientation and sequence of ply under three point bend test on the basis of total deformation. It is concluded that symmetric [(0/90)3]s ply orientation and CAF ply sequence is best suited for bending of composite plate in terms of lowest total deformation.Present work mainly deals with the bending analysis of inter-ply hybrid composite plate which is made by the combination of one natural and two synthetic unidirectional fabrics and epoxy resin. Finite element method is used to predict the bending behavior of composite plate with [(0/90)3]S, [(45/-45)3]S,[(30/-60)3]S symmetrical and [(0/90)3]US, [(45/-45)3]US, [(30/-60)3]US un-symmetrical ply orientation and FCA, FAC, CFA, CAF, AFC and ACF ply sequence (order). M odelling and analysis of composite plate are performed in ANSYS 16.0 software to determine the best ply orientation and sequence of ply under three point bend test on the basis of total deformation. It is concluded that symmetric [(0/90)3]s ply orientation and CAF ply sequence is best suited for bending of composite plate in terms of lowest total deformation.
{"title":"Bending analysis of interply hybrid composite plate","authors":"Sameer Ahmad, Leeladhar Rajput","doi":"10.1063/1.5130233","DOIUrl":"https://doi.org/10.1063/1.5130233","url":null,"abstract":"Present work mainly deals with the bending analysis of inter-ply hybrid composite plate which is made by the combination of one natural and two synthetic unidirectional fabrics and epoxy resin. Finite element method is used to predict the bending behavior of composite plate with [(0/90)3]S, [(45/-45)3]S,[(30/-60)3]S symmetrical and [(0/90)3]US, [(45/-45)3]US, [(30/-60)3]US un-symmetrical ply orientation and FCA, FAC, CFA, CAF, AFC and ACF ply sequence (order). M odelling and analysis of composite plate are performed in ANSYS 16.0 software to determine the best ply orientation and sequence of ply under three point bend test on the basis of total deformation. It is concluded that symmetric [(0/90)3]s ply orientation and CAF ply sequence is best suited for bending of composite plate in terms of lowest total deformation.Present work mainly deals with the bending analysis of inter-ply hybrid composite plate which is made by the combination of one natural and two synthetic unidirectional fabrics and epoxy resin. Finite element method is used to predict the bending behavior of composite plate with [(0/90)3]S, [(45/-45)3]S,[(30/-60)3]S symmetrical and [(0/90)3]US, [(45/-45)3]US, [(30/-60)3]US un-symmetrical ply orientation and FCA, FAC, CFA, CAF, AFC and ACF ply sequence (order). M odelling and analysis of composite plate are performed in ANSYS 16.0 software to determine the best ply orientation and sequence of ply under three point bend test on the basis of total deformation. It is concluded that symmetric [(0/90)3]s ply orientation and CAF ply sequence is best suited for bending of composite plate in terms of lowest total deformation.","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":"79020842","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}
Nano Science and technology is an emerging area of research all over the globe because of the peculiar properties make it as a successful candidate in different cross cutting fields with multiple applications. The silver nanoparticles has much importance and widely employed in our day to day life as it exhibits immense potential antimicrobial activity against wide variety of pathogenic microorganisms and henceforth used commonly in medicines, organ implants, theatre products and pharmaceutical products. There are several traditional methodologies for the synthesis of nanoparticles, but all are expensive, time consuming, needs sophisticated equipment’s, chemicals and contaminate the environment. In the current work, we have approached the preparation of nanoparticles following green protocol with the leaf extract from a medicinal plant, Hydnocarpus pentandra. The silver nanoparticles prepared were characterized using UV-Vis Spectroscopy and Scanning Electron Microscopy. The antimicrobial activities where tested for gram negative (Escherichia coli) and gram-positive (Salmonella aureus) microorganisms. The method that we used here is simple, cheap, sustainable and non-poisonous to non-target organisms and does not cause any harm to environment. The larvicidal activity against mosquito larvae were assessed as per World Health Organization Standards. The nanoparticles synthesized exhibits excellent antimicrobial and anti larvicidal activities. We have come up with a novel technique for the synthesis of nanoparticles following green conduit, which is viable, simple, eco-friendly, cost effective, and have explored its applications in different fields.Nano Science and technology is an emerging area of research all over the globe because of the peculiar properties make it as a successful candidate in different cross cutting fields with multiple applications. The silver nanoparticles has much importance and widely employed in our day to day life as it exhibits immense potential antimicrobial activity against wide variety of pathogenic microorganisms and henceforth used commonly in medicines, organ implants, theatre products and pharmaceutical products. There are several traditional methodologies for the synthesis of nanoparticles, but all are expensive, time consuming, needs sophisticated equipment’s, chemicals and contaminate the environment. In the current work, we have approached the preparation of nanoparticles following green protocol with the leaf extract from a medicinal plant, Hydnocarpus pentandra. The silver nanoparticles prepared were characterized using UV-Vis Spectroscopy and Scanning Electron Microscopy. The antimicrobial activities where t...
{"title":"Green synthesis of silver nanoparticles using Hydnocarpus pentandra leaf extract: Evaluation of its antimicrobial and anti - Larvicidal activities","authors":"Aswathi Shyam, Aswathy S. Murali, S. Chandran","doi":"10.1063/1.5130317","DOIUrl":"https://doi.org/10.1063/1.5130317","url":null,"abstract":"Nano Science and technology is an emerging area of research all over the globe because of the peculiar properties make it as a successful candidate in different cross cutting fields with multiple applications. The silver nanoparticles has much importance and widely employed in our day to day life as it exhibits immense potential antimicrobial activity against wide variety of pathogenic microorganisms and henceforth used commonly in medicines, organ implants, theatre products and pharmaceutical products. There are several traditional methodologies for the synthesis of nanoparticles, but all are expensive, time consuming, needs sophisticated equipment’s, chemicals and contaminate the environment. In the current work, we have approached the preparation of nanoparticles following green protocol with the leaf extract from a medicinal plant, Hydnocarpus pentandra. The silver nanoparticles prepared were characterized using UV-Vis Spectroscopy and Scanning Electron Microscopy. The antimicrobial activities where tested for gram negative (Escherichia coli) and gram-positive (Salmonella aureus) microorganisms. The method that we used here is simple, cheap, sustainable and non-poisonous to non-target organisms and does not cause any harm to environment. The larvicidal activity against mosquito larvae were assessed as per World Health Organization Standards. The nanoparticles synthesized exhibits excellent antimicrobial and anti larvicidal activities. We have come up with a novel technique for the synthesis of nanoparticles following green conduit, which is viable, simple, eco-friendly, cost effective, and have explored its applications in different fields.Nano Science and technology is an emerging area of research all over the globe because of the peculiar properties make it as a successful candidate in different cross cutting fields with multiple applications. The silver nanoparticles has much importance and widely employed in our day to day life as it exhibits immense potential antimicrobial activity against wide variety of pathogenic microorganisms and henceforth used commonly in medicines, organ implants, theatre products and pharmaceutical products. There are several traditional methodologies for the synthesis of nanoparticles, but all are expensive, time consuming, needs sophisticated equipment’s, chemicals and contaminate the environment. In the current work, we have approached the preparation of nanoparticles following green protocol with the leaf extract from a medicinal plant, Hydnocarpus pentandra. The silver nanoparticles prepared were characterized using UV-Vis Spectroscopy and Scanning Electron Microscopy. The antimicrobial activities where t...","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":"77097919","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}
Terbium doped Ni-Cd mixed ferrite samples with general formula Ni0.9Cd0.1TbxFe2-xO4 (x = 0, 0.02, 0.06 and 0.1) were prepared through sol-gel technique. The effect of terbium doping on the properties of Ni-Cd ferrite has been investigated using different characterization techniques like X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Wavelength Dispersive X-Ray Fluorescence Spectrometer (WD-XRF), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed the formation of single phase spinel structure in all the samples. Tb3+ doping has resulted in increased saturation magnetization and enhanced resistivity of Ni-Cd mixed ferrite.Terbium doped Ni-Cd mixed ferrite samples with general formula Ni0.9Cd0.1TbxFe2-xO4 (x = 0, 0.02, 0.06 and 0.1) were prepared through sol-gel technique. The effect of terbium doping on the properties of Ni-Cd ferrite has been investigated using different characterization techniques like X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Wavelength Dispersive X-Ray Fluorescence Spectrometer (WD-XRF), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed the formation of single phase spinel structure in all the samples. Tb3+ doping has resulted in increased saturation magnetization and enhanced resistivity of Ni-Cd mixed ferrite.
{"title":"Structural changes, magnetic properties and dielectric behaviour of Tb3+ doped Ni-Cd mixed ferrites","authors":"B. Jacob, P. Laneesh","doi":"10.1063/1.5130293","DOIUrl":"https://doi.org/10.1063/1.5130293","url":null,"abstract":"Terbium doped Ni-Cd mixed ferrite samples with general formula Ni0.9Cd0.1TbxFe2-xO4 (x = 0, 0.02, 0.06 and 0.1) were prepared through sol-gel technique. The effect of terbium doping on the properties of Ni-Cd ferrite has been investigated using different characterization techniques like X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Wavelength Dispersive X-Ray Fluorescence Spectrometer (WD-XRF), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed the formation of single phase spinel structure in all the samples. Tb3+ doping has resulted in increased saturation magnetization and enhanced resistivity of Ni-Cd mixed ferrite.Terbium doped Ni-Cd mixed ferrite samples with general formula Ni0.9Cd0.1TbxFe2-xO4 (x = 0, 0.02, 0.06 and 0.1) were prepared through sol-gel technique. The effect of terbium doping on the properties of Ni-Cd ferrite has been investigated using different characterization techniques like X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Wavelength Dispersive X-Ray Fluorescence Spectrometer (WD-XRF), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). XRD analysis confirmed the formation of single phase spinel structure in all the samples. Tb3+ doping has resulted in increased saturation magnetization and enhanced resistivity of Ni-Cd mixed ferrite.","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":"74005673","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}
Colloidal quantum dots (CQDs) are coming up as appealing platform, as exciting class of fluorescent probes for optical imaging, because of their tunable and unique optical properties, high stability and ability to target affected tissue, based on their surface functionalization compared to small molecules of organic dyes. More empathetically, it has been observed that the current dyes lack the signal penetration needed for optimal performance, the tissue specification, and stability in metabolic systems and photo bleaching resistivity properties. Thus, semiconducting QDs represent an exciting class of luminescent materials with favourable fluorescent properties like narrow emission band; efficient stokes shift and long fluorescent lifetime. Most specifically, tunable fluorescence ranging from UV-blue to the mid infrared emission to maintain high resolution for deeper imaging can be achieved by altering the size, size distribution and crystal structure of the QDs. These potential properties make QDs suitable as direct substitutes for the existing dyes. From the last 5-6 years, the application of fluorescent QDs, as probes for biological domain are emerging as smart bio-medical imaging, bio-tagging and drug delivery agents leading to a highly promising technique as fluorescent based techniques are very sensitive. However, decision of making QDs as the future heir of the present day drug associates/dyes, is still perplexed as their toxicity is a matter of great concern. Toxicity has become an integral part of QDs mainly due to a) non-surface passivation, b) oxidative degradation, c) poor biocompatibility and d) choosing of nonbiocompatible capping agents. Therefore efforts are going on to neutralize these threats during the synthesis part only, by surface functionalizing the QDs with better biocompatibility and cytofriendlyness. Since, these QDs are self-sufficient to heal any bacterial growth when bacteria are in touch with them, keeping in view of having tremendous potential application as tagging, imaging and antibacterial agents in biological systems, the present work reports the preparation, characterization and biocompatibility of semiconducting QDs with surface modifications to establish them as efficient fluorescent probes in health and medical sector.Colloidal quantum dots (CQDs) are coming up as appealing platform, as exciting class of fluorescent probes for optical imaging, because of their tunable and unique optical properties, high stability and ability to target affected tissue, based on their surface functionalization compared to small molecules of organic dyes. More empathetically, it has been observed that the current dyes lack the signal penetration needed for optimal performance, the tissue specification, and stability in metabolic systems and photo bleaching resistivity properties. Thus, semiconducting QDs represent an exciting class of luminescent materials with favourable fluorescent properties like narrow emission band; effici
{"title":"Semiconductor quantum dots as smart biocompatible imaging agents","authors":"J. M. Baruah, J. Narayan","doi":"10.1063/1.5130214","DOIUrl":"https://doi.org/10.1063/1.5130214","url":null,"abstract":"Colloidal quantum dots (CQDs) are coming up as appealing platform, as exciting class of fluorescent probes for optical imaging, because of their tunable and unique optical properties, high stability and ability to target affected tissue, based on their surface functionalization compared to small molecules of organic dyes. More empathetically, it has been observed that the current dyes lack the signal penetration needed for optimal performance, the tissue specification, and stability in metabolic systems and photo bleaching resistivity properties. Thus, semiconducting QDs represent an exciting class of luminescent materials with favourable fluorescent properties like narrow emission band; efficient stokes shift and long fluorescent lifetime. Most specifically, tunable fluorescence ranging from UV-blue to the mid infrared emission to maintain high resolution for deeper imaging can be achieved by altering the size, size distribution and crystal structure of the QDs. These potential properties make QDs suitable as direct substitutes for the existing dyes. From the last 5-6 years, the application of fluorescent QDs, as probes for biological domain are emerging as smart bio-medical imaging, bio-tagging and drug delivery agents leading to a highly promising technique as fluorescent based techniques are very sensitive. However, decision of making QDs as the future heir of the present day drug associates/dyes, is still perplexed as their toxicity is a matter of great concern. Toxicity has become an integral part of QDs mainly due to a) non-surface passivation, b) oxidative degradation, c) poor biocompatibility and d) choosing of nonbiocompatible capping agents. Therefore efforts are going on to neutralize these threats during the synthesis part only, by surface functionalizing the QDs with better biocompatibility and cytofriendlyness. Since, these QDs are self-sufficient to heal any bacterial growth when bacteria are in touch with them, keeping in view of having tremendous potential application as tagging, imaging and antibacterial agents in biological systems, the present work reports the preparation, characterization and biocompatibility of semiconducting QDs with surface modifications to establish them as efficient fluorescent probes in health and medical sector.Colloidal quantum dots (CQDs) are coming up as appealing platform, as exciting class of fluorescent probes for optical imaging, because of their tunable and unique optical properties, high stability and ability to target affected tissue, based on their surface functionalization compared to small molecules of organic dyes. More empathetically, it has been observed that the current dyes lack the signal penetration needed for optimal performance, the tissue specification, and stability in metabolic systems and photo bleaching resistivity properties. Thus, semiconducting QDs represent an exciting class of luminescent materials with favourable fluorescent properties like narrow emission band; effici","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":"90279495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present study, nanocrystalline cobalt ferrite with various sizes was synthesized by sol–gel auto combustion method at different pH condition. The XRD analysis confirmed the formation of single phase cubic cobalt ferrite when the pH reaches at 7. The average crystallite size of the samples increased from 14 to 19 nm indicating the influence of pH of the precipitating medium. The FT-IR spectra of the samples show strong absorption peak in the wave number range 400 to 600 cm−1 which are assigned to tetrahedral and octahedral metal complexes, confirmed the presence of metal - oxygen ion complexes within the spinel lattice. HR-TEM micrograph reveals the formation of nano flakes and the particle size obtained well matches with that estimated from XRD. Vibrating sample magnetometer (VSM) was used to investigate the magnetic properties of the sample. The magnetization of nanoparticles shows a strong dependence on pH of the medium. Magnetization curve fitting, a theoretical approach, is used to determine the various magnetic phase contributions to the total magnetization value and it reveals the paramagnetic phase along with ferromagnetic phase in the samples. The % contribution of ferromagnetic component increases with increasing the pH of the precipitating medium. The room temperature Mossbauer spectrum of a selected sample also confirmed the ferromagnetic nature of the sample.In the present study, nanocrystalline cobalt ferrite with various sizes was synthesized by sol–gel auto combustion method at different pH condition. The XRD analysis confirmed the formation of single phase cubic cobalt ferrite when the pH reaches at 7. The average crystallite size of the samples increased from 14 to 19 nm indicating the influence of pH of the precipitating medium. The FT-IR spectra of the samples show strong absorption peak in the wave number range 400 to 600 cm−1 which are assigned to tetrahedral and octahedral metal complexes, confirmed the presence of metal - oxygen ion complexes within the spinel lattice. HR-TEM micrograph reveals the formation of nano flakes and the particle size obtained well matches with that estimated from XRD. Vibrating sample magnetometer (VSM) was used to investigate the magnetic properties of the sample. The magnetization of nanoparticles shows a strong dependence on pH of the medium. Magnetization curve fitting, a theoretical approach, is used to determine th...
{"title":"Influence of pH on structural and magnetic properties of nanocrystalline cobalt ferrites synthesized by sol–gel method","authors":"I. Anila, M. Mathew","doi":"10.1063/1.5130287","DOIUrl":"https://doi.org/10.1063/1.5130287","url":null,"abstract":"In the present study, nanocrystalline cobalt ferrite with various sizes was synthesized by sol–gel auto combustion method at different pH condition. The XRD analysis confirmed the formation of single phase cubic cobalt ferrite when the pH reaches at 7. The average crystallite size of the samples increased from 14 to 19 nm indicating the influence of pH of the precipitating medium. The FT-IR spectra of the samples show strong absorption peak in the wave number range 400 to 600 cm−1 which are assigned to tetrahedral and octahedral metal complexes, confirmed the presence of metal - oxygen ion complexes within the spinel lattice. HR-TEM micrograph reveals the formation of nano flakes and the particle size obtained well matches with that estimated from XRD. Vibrating sample magnetometer (VSM) was used to investigate the magnetic properties of the sample. The magnetization of nanoparticles shows a strong dependence on pH of the medium. Magnetization curve fitting, a theoretical approach, is used to determine the various magnetic phase contributions to the total magnetization value and it reveals the paramagnetic phase along with ferromagnetic phase in the samples. The % contribution of ferromagnetic component increases with increasing the pH of the precipitating medium. The room temperature Mossbauer spectrum of a selected sample also confirmed the ferromagnetic nature of the sample.In the present study, nanocrystalline cobalt ferrite with various sizes was synthesized by sol–gel auto combustion method at different pH condition. The XRD analysis confirmed the formation of single phase cubic cobalt ferrite when the pH reaches at 7. The average crystallite size of the samples increased from 14 to 19 nm indicating the influence of pH of the precipitating medium. The FT-IR spectra of the samples show strong absorption peak in the wave number range 400 to 600 cm−1 which are assigned to tetrahedral and octahedral metal complexes, confirmed the presence of metal - oxygen ion complexes within the spinel lattice. HR-TEM micrograph reveals the formation of nano flakes and the particle size obtained well matches with that estimated from XRD. Vibrating sample magnetometer (VSM) was used to investigate the magnetic properties of the sample. The magnetization of nanoparticles shows a strong dependence on pH of the medium. Magnetization curve fitting, a theoretical approach, is used to determine th...","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":"78390013","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：