Pub Date : 2019-01-14DOI: 10.30799/jnst.201.19050106
Almaw Ayele Aniley, S. K. Kumar, A. Kumar
Here, NiMn2O4 and NiZn0.2Mn1.8O4 nanocrystalline ceramic powders are fabricated, characterized, and compared for thermistor applications. Solution route was used to synthesize the materials. The NiMn2O4 is a spinel single crystal material with the average crystallite size 26.82 nm and a particle size less than 1 μm and has uniform morphology. The EDS results confirmed the composition of NiMn2O4 that consisted of Ni, Mn, and O2 only. The average crystallite size of NiZn0.2Mn1.8O4 is 37.48 nm and the particle size is less than 0.5 μm. There has been observed some agglomeration formation due to high calcination temperature. The β-value of NiMn2O4 is larger than NiZn0.2Mn1.8O4, hence thermistors constructed from NiMn2O4 are more stable and applicable as NTCR thermistor powder.
{"title":"Fabrication, Characterization and Comparison of Nanocrystalline NiMn2O4 and NiZn0.2Mn1.8O4 NTCR Ceramic Thermistor Powders","authors":"Almaw Ayele Aniley, S. K. Kumar, A. Kumar","doi":"10.30799/jnst.201.19050106","DOIUrl":"https://doi.org/10.30799/jnst.201.19050106","url":null,"abstract":"Here, NiMn2O4 and NiZn0.2Mn1.8O4 nanocrystalline ceramic powders are fabricated, characterized, and compared for thermistor applications. Solution route was used to synthesize the materials. The NiMn2O4 is a spinel single crystal material with the average crystallite size 26.82 nm and a particle size less than 1 μm and has uniform morphology. The EDS results confirmed the composition of NiMn2O4 that consisted of Ni, Mn, and O2 only. The average crystallite size of NiZn0.2Mn1.8O4 is 37.48 nm and the particle size is less than 0.5 μm. There has been observed some agglomeration formation due to high calcination temperature. The β-value of NiMn2O4 is larger than NiZn0.2Mn1.8O4, hence thermistors constructed from NiMn2O4 are more stable and applicable as NTCR thermistor powder.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76481011","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 : 2019-01-05DOI: 10.30799/JNST.195.19050102
Meenu, Pawan Kumar, S Brijnandan Dehiya
This paper reports the one step hydrothermal synthesis of VO 2 (B) at high temperature in 24 h by using citric acid monohydrate as reducing agent and vanadium pentoxide as vanadium source. The phase of synthesized material is confirmed by XRD and indexed by JCPDS card. XRD results favors for pure phase of VO 2 (B). For confirmation of chemical composition vibrational bands FTIR is performed. For finding optical band gap, Tauc calculation has be done from UV-Vis spectroscopy. Photocatalytic activity is performed under UV radiation for 180 min. SEM and EDX is also performed for morphology and confirmation of elemental composition.
{"title":"One Step Hydrothermal Synthesis of Nanostructured VO2(B) for Photocatalytic Application","authors":"Meenu, Pawan Kumar, S Brijnandan Dehiya","doi":"10.30799/JNST.195.19050102","DOIUrl":"https://doi.org/10.30799/JNST.195.19050102","url":null,"abstract":"This paper reports the one step hydrothermal synthesis of VO 2 (B) at high temperature in 24 h by using citric acid monohydrate as reducing agent and vanadium pentoxide as vanadium source. The phase of synthesized material is confirmed by XRD and indexed by JCPDS card. XRD results favors for pure phase of VO 2 (B). For confirmation of chemical composition vibrational bands FTIR is performed. For finding optical band gap, Tauc calculation has be done from UV-Vis spectroscopy. Photocatalytic activity is performed under UV radiation for 180 min. SEM and EDX is also performed for morphology and confirmation of elemental composition.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83232313","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 : 2019-01-05DOI: 10.30799/JNST.178.19050103
T. Thenmozhi, Nadella Rasajna, M. Rajesh, N. Sushma
Magnetic iron oxide nanoparticles exhibit many interesting properties due to their surface chemistry and they can be exploited in biomedical and technological applications. The iron oxide nanoparticles (FeO NPs) using ferric chloride, ferrous chloride, PVP (Poly Vinyl Pyrolidone) and Syzygium aromaticum extract were successfully synthesized by wet-chemical co-precipitation method. The PVP coated FeO NPs and S. aromaticum loaded to PVP coated FeO NPs were systematically characterized by using expository tools. UV-Visible spectroscopy showed the maximum absorbance at 480 nm and 554 nm due to the excitation of surface plasmon vibrations in the FeO NPs formation. Fourier transform infrared (FT-IR) spectrum showed the presence of functional groups of in the form of various band positions and this study confirmed that phenols and primary amines were majorly present. DLS studies revealed narrow size of particles i.e., 399.8 nm and 190.1 nm. Particle size distribution was showed at 256 nm and 153 nm for these samples and zeta potential values were observed at -23.7 and -18.8 mV with greater stability. The X-ray diffraction (XRD) analysis is in good agreement with a high degree of crystallographic nature of particles and the average particle size was found to be 23 nm and 29 nm using Scherrer equation. FT-Raman spectrum showed three main characteristic peaks. The scope of this study was extended by examining the cytotoxicity of PVP coated FeO NPs and S. aromaticum loaded PVP coated FeO NPs on human breast (MCF-7) cancer cell lines. The results suggest that the S. aromaticum loaded FeO NPs acts as a potential anti-cancer agent and are a promising research field for lots of biomedical applications particularly for breast cancer studies.
{"title":"Biosynthesis and Characterization of Iron Oxide Nanoparticles via Syzygium aromaticum Extract and Determination of Its Cytotoxicity against Human Breast Cancer Cell Lines","authors":"T. Thenmozhi, Nadella Rasajna, M. Rajesh, N. Sushma","doi":"10.30799/JNST.178.19050103","DOIUrl":"https://doi.org/10.30799/JNST.178.19050103","url":null,"abstract":"Magnetic iron oxide nanoparticles exhibit many interesting properties due to their surface chemistry and they can be exploited in biomedical and technological applications. The iron oxide nanoparticles (FeO NPs) using ferric chloride, ferrous chloride, PVP (Poly Vinyl Pyrolidone) and Syzygium aromaticum extract were successfully synthesized by wet-chemical co-precipitation method. The PVP coated FeO NPs and S. aromaticum loaded to PVP coated FeO NPs were systematically characterized by using expository tools. UV-Visible spectroscopy showed the maximum absorbance at 480 nm and 554 nm due to the excitation of surface plasmon vibrations in the FeO NPs formation. Fourier transform infrared (FT-IR) spectrum showed the presence of functional groups of in the form of various band positions and this study confirmed that phenols and primary amines were majorly present. DLS studies revealed narrow size of particles i.e., 399.8 nm and 190.1 nm. Particle size distribution was showed at 256 nm and 153 nm for these samples and zeta potential values were observed at -23.7 and -18.8 mV with greater stability. The X-ray diffraction (XRD) analysis is in good agreement with a high degree of crystallographic nature of particles and the average particle size was found to be 23 nm and 29 nm using Scherrer equation. FT-Raman spectrum showed three main characteristic peaks. The scope of this study was extended by examining the cytotoxicity of PVP coated FeO NPs and S. aromaticum loaded PVP coated FeO NPs on human breast (MCF-7) cancer cell lines. The results suggest that the S. aromaticum loaded FeO NPs acts as a potential anti-cancer agent and are a promising research field for lots of biomedical applications particularly for breast cancer studies.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87134872","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 : 2019-01-05DOI: 10.30799/JNST.192.19050101
Vijaya Pandurang Dhawale, D. Late, S. D. Kulkarni
Present study deals with the sol-gel synthesis and application of α-Al2O3 nanoparticles (alumina) to decolorize the azo anionic dye methyl orange (MO). α-Al2O3 nanoparticles were successfully synthesized using aluminium oxide, 25% ammonia and polyvinyl alcohol (PVA) were used as low cost raw materials. The properties of synthesized nanoparticles were investigated by using UV-visible spectroscopy, XRD, FTIR, SEM, EDAX, Raman spectroscopy and TEM. From UV–visible spectra, band gap was calculated and it was found to be 3.31 eV. Average crystal size of α-Al2O3 nanoparticles from XRD peaks found to be 25 nm having rhombohedral structure. FTIR spectra reveals that functional groups (O-Al-O) are present. SEM image shows distribution pattern of α-Al2O3 nanoparticles. Chemical composition of α-Al2O3 nanoparticles was confirmed from EDAX spectroscopy measurement. Raman spectra showed crystalline nature of α-Al2O3 nanoparticles. The effect of concentration and pH of dye, dosage of nano adsorbent and contact time were studied. The systematic study shows that, successful color removal of methyl orange dye up to 54% in three hours contact time of pH 4. Hence α-Al2O3 nanoparticles can be used for dye removal from waste water. Industrialization of this technique will be cost effective way to decolorize the textile dye present in water system.
{"title":"Synthesis, Characterization of α-Al2O3 Nanoparticles and Its Application in Decolorization of Methyl Orange Azo Dye in the Presence of UV Light","authors":"Vijaya Pandurang Dhawale, D. Late, S. D. Kulkarni","doi":"10.30799/JNST.192.19050101","DOIUrl":"https://doi.org/10.30799/JNST.192.19050101","url":null,"abstract":"Present study deals with the sol-gel synthesis and application of α-Al2O3 nanoparticles (alumina) to decolorize the azo anionic dye methyl orange (MO). α-Al2O3 nanoparticles were successfully synthesized using aluminium oxide, 25% ammonia and polyvinyl alcohol (PVA) were used as low cost raw materials. The properties of synthesized nanoparticles were investigated by using UV-visible spectroscopy, XRD, FTIR, SEM, EDAX, Raman spectroscopy and TEM. From UV–visible spectra, band gap was calculated and it was found to be 3.31 eV. Average crystal size of α-Al2O3 nanoparticles from XRD peaks found to be 25 nm having rhombohedral structure. FTIR spectra reveals that functional groups (O-Al-O) are present. SEM image shows distribution pattern of α-Al2O3 nanoparticles. Chemical composition of α-Al2O3 nanoparticles was confirmed from EDAX spectroscopy measurement. Raman spectra showed crystalline nature of α-Al2O3 nanoparticles. The effect of concentration and pH of dye, dosage of nano adsorbent and contact time were studied. The systematic study shows that, successful color removal of methyl orange dye up to 54% in three hours contact time of pH 4. Hence α-Al2O3 nanoparticles can be used for dye removal from waste water. Industrialization of this technique will be cost effective way to decolorize the textile dye present in water system.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"84 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86841366","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 : 2019-01-05DOI: 10.30799/jnst.183.19050104
Arun K. Shettar, Shivakumar B. Madagi, Sunanda Sarwad
The X. americana leaf was extracted using water by cold extraction method. AgNPs were synthesized by phytoreducing method. The synthesized silver nanoparticles were characterized by using different techniques including UV–visible spectroscopy, FTIR analysis, scanning electron microscopy and energy dispersive X-ray spectroscopy. In-vitro antioxidant activity of synthesized AgNPs were evaluated by using FRAP, H2O2, and DPPH assays, anti-inflammatory activity was carried out by using protein denaturation in-vitro bioassay and anthelmintic activity by employing standard in-vitro method (Pheretima posthuma model). UV-Vis spectral analysis which revealed a higher absorbance peak (λmax) at 413 nm. FTIR spectra showed shifts in some peaks of aqueous extract with functional groups. SEM studies show the size of AgNPs in the range of 30-150 nm with irregular shape. EDX shows sharp peak of silver at 3 kev with various elemental composition. In-vitro pharmacological study revealed that synthesized AgNPs exhibited potential antioxidant, anti-inflammatory and anthelmintic activity.
{"title":"Pharmacological Applications of Silver Nanoparticles Synthesized using Aqueous Leaf Extract of Ximenia americana","authors":"Arun K. Shettar, Shivakumar B. Madagi, Sunanda Sarwad","doi":"10.30799/jnst.183.19050104","DOIUrl":"https://doi.org/10.30799/jnst.183.19050104","url":null,"abstract":"The X. americana leaf was extracted using water by cold extraction method. AgNPs were synthesized by phytoreducing method. The synthesized silver nanoparticles were characterized by using different techniques including UV–visible spectroscopy, FTIR analysis, scanning electron microscopy and energy dispersive X-ray spectroscopy. In-vitro antioxidant activity of synthesized AgNPs were evaluated by using FRAP, H2O2, and DPPH assays, anti-inflammatory activity was carried out by using protein denaturation in-vitro bioassay and anthelmintic activity by employing standard in-vitro method (Pheretima posthuma model). UV-Vis spectral analysis which revealed a higher absorbance peak (λmax) at 413 nm. FTIR spectra showed shifts in some peaks of aqueous extract with functional groups. SEM studies show the size of AgNPs in the range of 30-150 nm with irregular shape. EDX shows sharp peak of silver at 3 kev with various elemental composition. In-vitro pharmacological study revealed that synthesized AgNPs exhibited potential antioxidant, anti-inflammatory and anthelmintic activity.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74642328","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 : 2019-01-05DOI: 10.30799/JNST.185.19050105
.. P.Mariselvi, T. A. Kumar, V. Veeraputhiran, G. Alagumuthu
Titanium dioxide (TiO 2 ) occurs in three basic modification anatase, rutile and brookite. Anatase is widely studied due to its very good photocatalytic properties, which may be used in additives to paints and construction materials, degradation of organic pollutants in air and water etc.,. In the present work, the synthesis, characterization and photocatalytic activity of calcareous/TiO 2 nanocomposites on the removal of methylene blue dye were carried out by using solvothermal method. Synthesized nanocomposites was characterized by using XRD, SEM, EDAX and UV-Vis absorption spectroscopy. The XRD pattern reveals the course of composites formation and calcareous/TiO 2 nanocomposites containing anatase phase of TiO2 were found. The higher photocatalytic activity was obtained in anatase phase of TiO 2 than rutile. It is concluded that the higher photocatalytic activity in anatase is due to parameters like band gap, number of hydroxyl groups, surface area and porosity of catalyst. The spherical morphology of calcareous/TiO 2 nanocomposites was observed in SEM analysis. The photocatalytic efficiency of various operational parameters like concentration, time, catalyst loading and pH on methylene blue dye was also studied.
{"title":"Synthesis, Characterization and Photocatalytic Activity of Calcareous/TiO2 Nanocomposites under UV Light Irradiation using Methylene Blue Dye","authors":".. P.Mariselvi, T. A. Kumar, V. Veeraputhiran, G. Alagumuthu","doi":"10.30799/JNST.185.19050105","DOIUrl":"https://doi.org/10.30799/JNST.185.19050105","url":null,"abstract":"Titanium dioxide (TiO 2 ) occurs in three basic modification anatase, rutile and brookite. Anatase is widely studied due to its very good photocatalytic properties, which may be used in additives to paints and construction materials, degradation of organic pollutants in air and water etc.,. In the present work, the synthesis, characterization and photocatalytic activity of calcareous/TiO 2 nanocomposites on the removal of methylene blue dye were carried out by using solvothermal method. Synthesized nanocomposites was characterized by using XRD, SEM, EDAX and UV-Vis absorption spectroscopy. The XRD pattern reveals the course of composites formation and calcareous/TiO 2 nanocomposites containing anatase phase of TiO2 were found. The higher photocatalytic activity was obtained in anatase phase of TiO 2 than rutile. It is concluded that the higher photocatalytic activity in anatase is due to parameters like band gap, number of hydroxyl groups, surface area and porosity of catalyst. The spherical morphology of calcareous/TiO 2 nanocomposites was observed in SEM analysis. The photocatalytic efficiency of various operational parameters like concentration, time, catalyst loading and pH on methylene blue dye was also studied.","PeriodicalId":23586,"journal":{"name":"Volume 5,Issue 1,2019","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89722229","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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