Pub Date : 2015-10-01DOI: 10.7508/IJND.2015.04.009
Kordani Naser, A. Sadough-vanini
In this paper, finite element model of woven fabric target has been investigated which is impacted by a cylindrical projectile. Fabrics are impregnated with Shear Thickening Fluid (STF). The effects of the (STF) have been considered as frictional effect. The STF has been made (Nano Silica and Polyethylene Glycol (PEG)) and then diluted by ethanol proportion of 3:1. Yarn pulling out test from inside of fabric is performed to estimate the pulling out force and the friction coefficient. The speed of pulling out was 500 mm/min and the samples were placed vertically in tensile device. The results of yarn pulled out indicated that the fabric impregnated in STF needs more force in order to gets out of fabric. Friction coefficient of a regular fabric is 0.26 and in a fabric impregnated by STF is 1.5. Friction coefficients of tow fabric types of raw fabric and fabric with STF are entered in ANSYS software along with mechanical characteristic of a yarn. Ballistic range velocity was extracted for samples in software and was compared with experience results.
{"title":"Yarn pulling out test and numerical solution of penetration into woven fabric target impregnated with shear thickening fluid using SiO2 /Polyethylene Glycol","authors":"Kordani Naser, A. Sadough-vanini","doi":"10.7508/IJND.2015.04.009","DOIUrl":"https://doi.org/10.7508/IJND.2015.04.009","url":null,"abstract":"In this paper, finite element model of woven fabric target has been investigated which is impacted by a cylindrical projectile. Fabrics are impregnated with Shear Thickening Fluid (STF). The effects of the (STF) have been considered as frictional effect. The STF has been made (Nano Silica and Polyethylene Glycol (PEG)) and then diluted by ethanol proportion of 3:1. Yarn pulling out test from inside of fabric is performed to estimate the pulling out force and the friction coefficient. The speed of pulling out was 500 mm/min and the samples were placed vertically in tensile device. The results of yarn pulled out indicated that the fabric impregnated in STF needs more force in order to gets out of fabric. Friction coefficient of a regular fabric is 0.26 and in a fabric impregnated by STF is 1.5. Friction coefficients of tow fabric types of raw fabric and fabric with STF are entered in ANSYS software along with mechanical characteristic of a yarn. Ballistic range velocity was extracted for samples in software and was compared with experience results.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79208529","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}
Pub Date : 2015-10-01DOI: 10.7508/IJND.2015.04.012
S. Sagadevan, K. Pandurangan
Nowadays, II – IV group semiconductor thin films have attracted considerable attention from the research community because of their wide range of application in the fabrication of solar cells and other opto-electronic devices. Cadmium zinc sulfide (Zn-CdS) thin films were grown by chemical bath deposition (CBD) technique. X-ray diffraction (XRD) is used to analyze the structure and crystallite size and scanning electron microscopy is used to study the morphology of Zn-CdS thin film. Optical studies have been carried out using UV-Visible-NIR transmission spectrum. The dielectric properties of Zn-CdS thin films have been studied in the different frequency at different temperatures. The AC conductivity study shows a normal dielectric behavior with frequency which reveals that the dispersion is due to the interfacial polarization.
{"title":"INVESTIGATIONS ON STRUCTURAL AND ELECTRICAL PROPERTIES OF CADMIUM ZINC SULFIDE THIN FILMS","authors":"S. Sagadevan, K. Pandurangan","doi":"10.7508/IJND.2015.04.012","DOIUrl":"https://doi.org/10.7508/IJND.2015.04.012","url":null,"abstract":"Nowadays, II – IV group semiconductor thin films have attracted considerable attention from the research community because of their wide range of application in the fabrication of solar cells and other opto-electronic devices. Cadmium zinc sulfide (Zn-CdS) thin films were grown by chemical bath deposition (CBD) technique. X-ray diffraction (XRD) is used to analyze the structure and crystallite size and scanning electron microscopy is used to study the morphology of Zn-CdS thin film. Optical studies have been carried out using UV-Visible-NIR transmission spectrum. The dielectric properties of Zn-CdS thin films have been studied in the different frequency at different temperatures. The AC conductivity study shows a normal dielectric behavior with frequency which reveals that the dispersion is due to the interfacial polarization.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91318483","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.009
M. Rafiee
Using ab initio calculations, the hydrogen desorption from Magnesium hydride (MgH2) was studied. We presented the calculated nuclear quadrupole coupling constants (NQCCs) of hydrogen atom in various systems of MgH2. The effect of interactions of some metal atoms as well as Boron atom with MgH2 host matrix; (MgH2+M) nanostructures (M=Al, Ti, V, Fe, Ni and B); were studied and 2 H-NQCCs were calculated. From results, introduction of B decreased 2 H-NQCC and consequently trend of decrease of charge density in the presence of B was observed. In the other hands introduction of B destabilized initial structure of MgH2, But in (MgH2+M) nanostructures(M=Al, Ti, V, Fe and Ni) the 2 H- NQCCs were larger than those of pure MgH2 and consequently more difficult condition for hydrogen desorption were created. However at sufficiently low B concentration (Mg15BH32); the calculation predicted existence of stable dopant system with greater
{"title":"Comparison of metal additives and Boron atom on MgH2 absorbing-desorbing characteristics using calculated NQCCs","authors":"M. Rafiee","doi":"10.7508/IJND.2015.03.009","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.009","url":null,"abstract":"Using ab initio calculations, the hydrogen desorption from Magnesium hydride (MgH2) was studied. We presented the calculated nuclear quadrupole coupling constants (NQCCs) of hydrogen atom in various systems of MgH2. The effect of interactions of some metal atoms as well as Boron atom with MgH2 host matrix; (MgH2+M) nanostructures (M=Al, Ti, V, Fe, Ni and B); were studied and 2 H-NQCCs were calculated. From results, introduction of B decreased 2 H-NQCC and consequently trend of decrease of charge density in the presence of B was observed. In the other hands introduction of B destabilized initial structure of MgH2, But in (MgH2+M) nanostructures(M=Al, Ti, V, Fe and Ni) the 2 H- NQCCs were larger than those of pure MgH2 and consequently more difficult condition for hydrogen desorption were created. However at sufficiently low B concentration (Mg15BH32); the calculation predicted existence of stable dopant system with greater","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75691784","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.013
A. Subramaniyan, R. Ilangovan
The term Nanofluids was first coined by Sir Stephen Choi in 1995 at Argonne National Laboratory ,U.S.A .Since the discovery, nanofluid have been explored as heat transfer fluids. Nanofluids increased the thermal conductivity of existing coolants (Water, Ethylene glycol) by a magnitude of hundred times which made them attractive for miniaturization of electronic devices .From 1995 till 2008 nanofluid research was focused on enhancing the thermal conductivity of the base fluid by various parameters like shape of nanoparticle, volume fraction of base fluid and material of base fluid and composition of nanoparticle. A lot of theoretical models have been evolved in an attempt to explain the basic mechanism of heat transfer in a nanofluid .Research has been with respect to viscosity, stability, thermal conductivity and convective heat transfer coefficients of nanofluids. From 2008 nanofluids have been investigated for their electrical properties and reported as electrical conductivity enhancers for base fluid. The latest trend in nanofluid is towards optical properties of nanofluid for direct absorption solar collectors.
{"title":"A report on the latest trends in nanofluid research","authors":"A. Subramaniyan, R. Ilangovan","doi":"10.7508/IJND.2015.03.013","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.013","url":null,"abstract":"The term Nanofluids was first coined by Sir Stephen Choi in 1995 at Argonne National Laboratory ,U.S.A .Since the discovery, nanofluid have been explored as heat transfer fluids. Nanofluids increased the thermal conductivity of existing coolants (Water, Ethylene glycol) by a magnitude of hundred times which made them attractive for miniaturization of electronic devices .From 1995 till 2008 nanofluid research was focused on enhancing the thermal conductivity of the base fluid by various parameters like shape of nanoparticle, volume fraction of base fluid and material of base fluid and composition of nanoparticle. A lot of theoretical models have been evolved in an attempt to explain the basic mechanism of heat transfer in a nanofluid .Research has been with respect to viscosity, stability, thermal conductivity and convective heat transfer coefficients of nanofluids. From 2008 nanofluids have been investigated for their electrical properties and reported as electrical conductivity enhancers for base fluid. The latest trend in nanofluid is towards optical properties of nanofluid for direct absorption solar collectors.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84535957","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.012
S. Amirtharajan, P. Jeyaprakash, J. Natarajan, P. Natarajan
Porous Silicon (PS) samples have been prepared by electrochemical anodization of p-type silicon wafer by varying HF concentrations in the electrolytic solution. The structural, surface morphological, optical and surface composition analysis of the prepared samples were done by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Photoluminescence (PL) and Fourier transform infrared (FTIR) spectroscopy studies respectively. The grain sizes of PS were determined by XRD study. The porosity of PS samples was estimated by using the parameters obtained from the SEM images by the geometrical method. The porosity of the samples was found to vary between 11% and 84% due to the variation in HF concentration in the electrolytic solution. The refractive index and dielectric constant values of PS as a function of porosity were determined by Effective Medium Approximation methods. Strong visible emission peak at 498 nm, with no apparent shift with respect to variation in etching parameter, is observed in Photoluminescence study. The surface bonding and their vibration modes of the PS were determined by transmission FTIR spectroscopy.
{"title":"CONTROL CAPABILITY OF ELECTROLYTIC CONCENTRATION ON REFRACTIVE INDEX AND DIELECTRIC CONSTANT OF POROUS SILICON LAYERS","authors":"S. Amirtharajan, P. Jeyaprakash, J. Natarajan, P. Natarajan","doi":"10.7508/IJND.2015.03.012","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.012","url":null,"abstract":"Porous Silicon (PS) samples have been prepared by electrochemical anodization of p-type silicon wafer by varying HF concentrations in the electrolytic solution. The structural, surface morphological, optical and surface composition analysis of the prepared samples were done by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Photoluminescence (PL) and Fourier transform infrared (FTIR) spectroscopy studies respectively. The grain sizes of PS were determined by XRD study. The porosity of PS samples was estimated by using the parameters obtained from the SEM images by the geometrical method. The porosity of the samples was found to vary between 11% and 84% due to the variation in HF concentration in the electrolytic solution. The refractive index and dielectric constant values of PS as a function of porosity were determined by Effective Medium Approximation methods. Strong visible emission peak at 498 nm, with no apparent shift with respect to variation in etching parameter, is observed in Photoluminescence study. The surface bonding and their vibration modes of the PS were determined by transmission FTIR spectroscopy.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82496275","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.003
M. Naghibi, Rahimi Esbo Mazaher, R. Mohammadyari, K. Mobini
Using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. Use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. In this work two-dimensional incompressible laminar flow of a nanofluid entering a diverging channel with sinusoidal walls through a jet at inlet section, is numerically investigated. Effects of aspect ratio (duct-to-jet height ratio), wall-wave amplitude, wall wavelength, Reynolds number, nanoparticle volume fraction and the size of nanoparticles on the flow structure and heat transfer are investigated. The results show that by increasing the Reynolds number, wall wave amplitude and nanoparticle volume fraction, the duct averaged Nusselt number will increase, while the wall wavelength and the particle size have an adverse effect. The inlet jet has the strongest effect on heat transfer at the aspect ratio of 4.
{"title":"Investigation of flow and heat transfer of nanofluid in a diverging sinusoidal channel","authors":"M. Naghibi, Rahimi Esbo Mazaher, R. Mohammadyari, K. Mobini","doi":"10.7508/IJND.2015.03.003","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.003","url":null,"abstract":"Using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. Use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. In this work two-dimensional incompressible laminar flow of a nanofluid entering a diverging channel with sinusoidal walls through a jet at inlet section, is numerically investigated. Effects of aspect ratio (duct-to-jet height ratio), wall-wave amplitude, wall wavelength, Reynolds number, nanoparticle volume fraction and the size of nanoparticles on the flow structure and heat transfer are investigated. The results show that by increasing the Reynolds number, wall wave amplitude and nanoparticle volume fraction, the duct averaged Nusselt number will increase, while the wall wavelength and the particle size have an adverse effect. The inlet jet has the strongest effect on heat transfer at the aspect ratio of 4.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75070105","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.002
R. Mostafa, O. Moradi, A. Mazlomifar
The present study was carried out to investigate the potential of carboxylate group functionalized Multi-walled carbon nanotubes (MWCNT−COOH) adsorbent for the removal of Methyl orange (MO) textile dye from aqueous solutions. The effects of pH, shaking time and temperature on adsorption capacity were studied; the contact time to obtain equilibrium at 298 ˚K was fixed at 25 min. The effect of temperature on adsorption process was evaluated from 298 to 338 ˚K. Results showed that removal of Methyl orange increased with increasing contact time and decreased with increasing pH and temperature. For Methyl orange dye, the equilibrium data were best fitted to The Langmuir isotherm model. The adsorbent was characterized by infrared spectroscopy, and scanning electron microscopy. The pseudo-secondorder kinetic model provided the best fit to the experimental data compared with The Elovich or pseudo-first-order or intra-particle diffusion kinetic adsorption models.
{"title":"Adsorption of Methyl orange dye from Water solutions by carboxylate group functionalized multi-walled Carbon nanotubes","authors":"R. Mostafa, O. Moradi, A. Mazlomifar","doi":"10.7508/IJND.2015.03.002","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.002","url":null,"abstract":"The present study was carried out to investigate the potential of carboxylate group functionalized Multi-walled carbon nanotubes (MWCNT−COOH) adsorbent for the removal of Methyl orange (MO) textile dye from aqueous solutions. The effects of pH, shaking time and temperature on adsorption capacity were studied; the contact time to obtain equilibrium at 298 ˚K was fixed at 25 min. The effect of temperature on adsorption process was evaluated from 298 to 338 ˚K. Results showed that removal of Methyl orange increased with increasing contact time and decreased with increasing pH and temperature. For Methyl orange dye, the equilibrium data were best fitted to The Langmuir isotherm model. The adsorbent was characterized by infrared spectroscopy, and scanning electron microscopy. The pseudo-secondorder kinetic model provided the best fit to the experimental data compared with The Elovich or pseudo-first-order or intra-particle diffusion kinetic adsorption models.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82837574","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.001
Seyedeh Zeinab Asadi, S. Ehsan, A. Tarighaleslami
Polyacrylonitrile (PAN) membranes with nano-porous surface and high hydrophilicity were fabricated by addition of polyoxyethylene (40) nonylphenyl ether (IGEPAL) as an additive in the casting solution. The membranes were prepared from PAN/IGEPAL/1-Methyl-2pyrrolidone (NMP) via phase inversion induced by immersion precipitation technique. Pure water was used as coagulation medium. The effects of adding IGEPAL and the PAN concentration on the morphology, wettability, and permeability of the prepared membranes were studied. The morphological studies were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). In addition, the wettability and permeability of membranes were examined by contact angel measurements and permeation experiments. The contact angle measurements indicate that the hydrophilicities of membrane enhanced by the addition of IGEPAL surfactant and decreasing the PAN concentration in the casting solution. According to SEM and AFM analysis, it was found that the addition of IGEPAL and change concentration of polymer have a significant influence on structure of the membrane top surface and the sub-layer. In addition, it was found that decreasing the PAN concentration and addition of IGEPAL resulted in the formation of membranes with high permeability.
{"title":"PREPARATION AND CHARACTERIZATION OF NANO-POROUS POLYACRYLONITRILE (PAN) MEMBRANES WITH HYDROPHILIC SURFACE","authors":"Seyedeh Zeinab Asadi, S. Ehsan, A. Tarighaleslami","doi":"10.7508/IJND.2015.03.001","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.001","url":null,"abstract":"Polyacrylonitrile (PAN) membranes with nano-porous surface and high hydrophilicity were fabricated by addition of polyoxyethylene (40) nonylphenyl ether (IGEPAL) as an additive in the casting solution. The membranes were prepared from PAN/IGEPAL/1-Methyl-2pyrrolidone (NMP) via phase inversion induced by immersion precipitation technique. Pure water was used as coagulation medium. The effects of adding IGEPAL and the PAN concentration on the morphology, wettability, and permeability of the prepared membranes were studied. The morphological studies were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). In addition, the wettability and permeability of membranes were examined by contact angel measurements and permeation experiments. The contact angle measurements indicate that the hydrophilicities of membrane enhanced by the addition of IGEPAL surfactant and decreasing the PAN concentration in the casting solution. According to SEM and AFM analysis, it was found that the addition of IGEPAL and change concentration of polymer have a significant influence on structure of the membrane top surface and the sub-layer. In addition, it was found that decreasing the PAN concentration and addition of IGEPAL resulted in the formation of membranes with high permeability.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76173425","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.004
V. Chidambaram, R. Paulsingh
Nanoparticles of Mn0.5Zn0.5-xCdxFe2O4 with x varying from x = 0.0 to 0.3 were prepared by wet chemical co-precipitation method. The structural and magnetic properties were studied by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM) and Electron Paramagnetic Resonance (EPR) technique. The lattice constant increases with increase in Cd content. This increase in the lattice constant is due to larger ionic radii of the Cd 2+ (0.97 A) ions as compared to Fe 3+ (0.64 A) ions. The intensities of the planes (220) and (440), increases with increasing Cd 2+ ion concentration. This shows that Cd 2+ ions occupy tetrahedral A sites and octahedral B sites in the nano dimension against their chemical preference for A site. The line width (ΔHpp) and the g value of the Electron paramagnetic resonance (EPR) signal decreases with increase in the Cd content. The magnetic moment of all the samples up to x = 0.2 calculated from EPR studies are lower when compared to the theoretical values. This lower value of magnetic moment confirms the existence of non collinear magnetic structure arising due to significant amount of spin disorder existing at B site.
{"title":"EPR studies of Cd substituted Mn Zn nanoferrites","authors":"V. Chidambaram, R. Paulsingh","doi":"10.7508/IJND.2015.03.004","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.004","url":null,"abstract":"Nanoparticles of Mn0.5Zn0.5-xCdxFe2O4 with x varying from x = 0.0 to 0.3 were prepared by wet chemical co-precipitation method. The structural and magnetic properties were studied by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM) and Electron Paramagnetic Resonance (EPR) technique. The lattice constant increases with increase in Cd content. This increase in the lattice constant is due to larger ionic radii of the Cd 2+ (0.97 A) ions as compared to Fe 3+ (0.64 A) ions. The intensities of the planes (220) and (440), increases with increasing Cd 2+ ion concentration. This shows that Cd 2+ ions occupy tetrahedral A sites and octahedral B sites in the nano dimension against their chemical preference for A site. The line width (ΔHpp) and the g value of the Electron paramagnetic resonance (EPR) signal decreases with increase in the Cd content. The magnetic moment of all the samples up to x = 0.2 calculated from EPR studies are lower when compared to the theoretical values. This lower value of magnetic moment confirms the existence of non collinear magnetic structure arising due to significant amount of spin disorder existing at B site.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77515441","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}
Pub Date : 2015-07-01DOI: 10.7508/IJND.2015.03.011
H. Tayebi, A. Bigdeli, A. Torabinezhad, S. Tayebi
Polypropylene / polystyrene blends containing montmorillonite (MMT) were prepared using a twin screw extruder followed by fiber spinning. The melt intercalation of PP and PS alloys was carried out in the presence of a compatibilizer such as maleic anhydride-gpolypropylene (MPP). The crystallization morphology, thermal behaviors and mechanical properties of polypropylene/polystyrene (PP/PS) nanoclay blends nanocomposite fibers were investigated in the present work. The improved adhesion between the phases and fine morphology of the dispersed phase contributed to the significant improvement in the properties and thermal stability of the final nanocomposite materials. On the basis of this result, we describe a general understanding of how the morphology is related to the final properties of OMMT- incorporated PP/PS blends.
{"title":"Polypropylene/Polystyrene in situ nano reinforced blends fiber: Morphology and properties","authors":"H. Tayebi, A. Bigdeli, A. Torabinezhad, S. Tayebi","doi":"10.7508/IJND.2015.03.011","DOIUrl":"https://doi.org/10.7508/IJND.2015.03.011","url":null,"abstract":"Polypropylene / polystyrene blends containing montmorillonite (MMT) were prepared using a twin screw extruder followed by fiber spinning. The melt intercalation of PP and PS alloys was carried out in the presence of a compatibilizer such as maleic anhydride-gpolypropylene (MPP). The crystallization morphology, thermal behaviors and mechanical properties of polypropylene/polystyrene (PP/PS) nanoclay blends nanocomposite fibers were investigated in the present work. The improved adhesion between the phases and fine morphology of the dispersed phase contributed to the significant improvement in the properties and thermal stability of the final nanocomposite materials. On the basis of this result, we describe a general understanding of how the morphology is related to the final properties of OMMT- incorporated PP/PS blends.","PeriodicalId":14081,"journal":{"name":"international journal of nano dimension","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89510885","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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