Pub Date : 2023-07-01DOI: 10.15251/djnb.2023.183.899
Mijia Yang, Y. C. Wu, Y. H. Liu, J. Q. Chen, C. Wu, W. Feng, W. Cai, X. L. Wang
In recent years, the effective hydrogen release from hydrogen storage materials has attracted extensive attention. In this work, CoCl2·6H2O (Cobalt chloride hexahydrate, CCH), a low cost and easily available catalyst, was successfully used to catalyze the hydrolysis of NaBH4-NH3BH3 composite (xSB-AB, x is the molar ratio of SB to AB). The results show that the synergistic effect produced by ball milling is beneficial to improve the hydrogen release performance of xSB-AB hydrolysis. This work not only advances the understanding of the synergistic effect of SB and AB, but also provides a basis for using low-cost catalysts to improve the hydrolysis performance of xSB-AB
{"title":"Hydrogen release from hydrolysis of NaBH4-NH3BH3 composite promoted by CoCl2·6H2O","authors":"Mijia Yang, Y. C. Wu, Y. H. Liu, J. Q. Chen, C. Wu, W. Feng, W. Cai, X. L. Wang","doi":"10.15251/djnb.2023.183.899","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.899","url":null,"abstract":"In recent years, the effective hydrogen release from hydrogen storage materials has attracted extensive attention. In this work, CoCl2·6H2O (Cobalt chloride hexahydrate, CCH), a low cost and easily available catalyst, was successfully used to catalyze the hydrolysis of NaBH4-NH3BH3 composite (xSB-AB, x is the molar ratio of SB to AB). The results show that the synergistic effect produced by ball milling is beneficial to improve the hydrogen release performance of xSB-AB hydrolysis. This work not only advances the understanding of the synergistic effect of SB and AB, but also provides a basis for using low-cost catalysts to improve the hydrolysis performance of xSB-AB","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49192429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/djnb.2023.183.869
R. Thambidurai, G. Gobi, R. Uthrakumar, C. Inmozhi, K. Kaviyarasu
Pure and TiO2 doped MnO2 nanoparticles were made using a simple sol-gel technique, and their structural, morphological, characteristics were characteristically examined using XRD, FTIR, and UV-Visible and photocatalytic analysis. Through XRD and SEM analyses, a tetragonal crystalline structure with spherical nanoparticles was discovered. The EDAX experiments provide additional evidence of TiO2's presence in the MnO2 crystal matrix. From UV spectral studies, the band gap energy of MnO2 doped was determined. Photo-degradation study was monitored using methylene blue (MB) and phenol dye solution under visible light irradiation. MnO2 doped catalyst displayed exceptional photocatalytic efficacy towards MB dye under ideal conditions
{"title":"Characterizations of MnO2 doped TiO2 nanostructures and effective degradation of methylene blue dye under visible light irradition","authors":"R. Thambidurai, G. Gobi, R. Uthrakumar, C. Inmozhi, K. Kaviyarasu","doi":"10.15251/djnb.2023.183.869","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.869","url":null,"abstract":"Pure and TiO2 doped MnO2 nanoparticles were made using a simple sol-gel technique, and their structural, morphological, characteristics were characteristically examined using XRD, FTIR, and UV-Visible and photocatalytic analysis. Through XRD and SEM analyses, a tetragonal crystalline structure with spherical nanoparticles was discovered. The EDAX experiments provide additional evidence of TiO2's presence in the MnO2 crystal matrix. From UV spectral studies, the band gap energy of MnO2 doped was determined. Photo-degradation study was monitored using methylene blue (MB) and phenol dye solution under visible light irradiation. MnO2 doped catalyst displayed exceptional photocatalytic efficacy towards MB dye under ideal conditions","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43153599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/djnb.2023.183.927
Z. J. Neamah, S. H. Mahdi
The goal of this study was to improve the mechanical and thermal properties of PolyMethyl Meth Acrylate (PMMA) by adding Zirconia nanoparticles in various weight fraction percentages (0, 1, 1.5, 2, 2.5, 3)%. The cast technique was utilized of to prepare the (PMMA/zirconia) nanocomposites. The thermal and mechanical characterized of (PMMA/zirconia) nanocomposites were studied. Increased zirconia percentages in (PMMA/zirconia) nanocomposites lead to increase thermal conductivity (K), glass transition temperature, specific heat capacity (Cp), effusivity, impact strength, hardness, flexural strength, compressive strength and reduced wear rate, enhancing the thermal and mechanical properties of Poly-Methyl Meth Acrylate (PMMA).
{"title":"Effect of zirconia addition on thermal and mechanical properties of poly-methyl methacrylate composites","authors":"Z. J. Neamah, S. H. Mahdi","doi":"10.15251/djnb.2023.183.927","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.927","url":null,"abstract":"The goal of this study was to improve the mechanical and thermal properties of PolyMethyl Meth Acrylate (PMMA) by adding Zirconia nanoparticles in various weight fraction percentages (0, 1, 1.5, 2, 2.5, 3)%. The cast technique was utilized of to prepare the (PMMA/zirconia) nanocomposites. The thermal and mechanical characterized of (PMMA/zirconia) nanocomposites were studied. Increased zirconia percentages in (PMMA/zirconia) nanocomposites lead to increase thermal conductivity (K), glass transition temperature, specific heat capacity (Cp), effusivity, impact strength, hardness, flexural strength, compressive strength and reduced wear rate, enhancing the thermal and mechanical properties of Poly-Methyl Meth Acrylate (PMMA).","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42502624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.15251/djnb.2023.183.889
N. Nguyen, V. Nguyen
In this study we synthesized nano-sized ZnO particles by ultrasonic-assisted sol-gel method. The materials were, then, sintered at different temperatures of 400 o C, 500 o C, 600 o C, and 700 o C. The structural, morphological, and optical properties of the obtained ZnO nanoparticles were characterized by XRD, UV VIS, FE-SEM, and TEM. The results showed that ZnO nanoparticles have a hexagonal wurtzite crystalline structure, spherical and hexagonal shapes, and an average size of 22-30 nm. ZnO nanoparticles were used as photocatalysts to decompose methylene blue under ultraviolet light. The results showed that the materials are able to decompose methylene blue under ultra-violet lights. The material sintered 600o C achieved the highest efficiency. From that, it can be concluded that ZnO nanoparticles have potential applications as photocatalysts for organic dyes removal in aqueous solutions.
{"title":"Ultrasound-assisted sol-gel synthesis, characterization, and photocatalytic application of ZnO nanoparticles","authors":"N. Nguyen, V. Nguyen","doi":"10.15251/djnb.2023.183.889","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.889","url":null,"abstract":"In this study we synthesized nano-sized ZnO particles by ultrasonic-assisted sol-gel method. The materials were, then, sintered at different temperatures of 400 o C, 500 o C, 600 o C, and 700 o C. The structural, morphological, and optical properties of the obtained ZnO nanoparticles were characterized by XRD, UV VIS, FE-SEM, and TEM. The results showed that ZnO nanoparticles have a hexagonal wurtzite crystalline structure, spherical and hexagonal shapes, and an average size of 22-30 nm. ZnO nanoparticles were used as photocatalysts to decompose methylene blue under ultraviolet light. The results showed that the materials are able to decompose methylene blue under ultra-violet lights. The material sintered 600o C achieved the highest efficiency. From that, it can be concluded that ZnO nanoparticles have potential applications as photocatalysts for organic dyes removal in aqueous solutions.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43177122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.15251/djnb.2023.182.547
R. Manimegalai, S. Sendhilnathan, V. Chithambaram, M. Kumar
The Co-Zn ferrites 𝐶𝐶𝐶𝐶0.5𝑍𝑍𝑍𝑍0.5𝐶𝐶𝐶𝐶𝑥𝑥𝐹𝐹𝐹𝐹(2−𝑥𝑥)𝑂𝑂4 (x-0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by CO-precipitation method. The dielectric and structural properties has been investigated by effect of Cd doping in Co-Zn spinel ferrites. Dielectric constants were studied dependence of the frequency and temperature thus revealed that the dielectric dispersion based on the MaxwellWagner method polarizations are agreed with Koop’s conceptualization theory. Further, dielectric properties were studies over a frequency range from 10 kHZ to 30 MHZ. The dielectric constant is varied from 2.4 to 8.4 for real parts and 0.008 to 0.42 for imaginary parts, respectively. The tangent loss also recorded as 0.003 to 0.052 at 1 MHZ due to Co ions concentrations. In high and low frequencies of grain and grain boundary contribution is an important evident for obtained dielectric constant. The obtained values of coercivity (Hc) for these ferrites range between 280.4 Oe to 1380.3 Oe, based on VSM data. By converting Zn2+ and Cd2+ to cobalt magnetic ions it is possible to convert the magnetic properties of cobalt ferrite into a potential individual for numerous technical uses. The dielectric loss at room temperature and at high frequencies is found to be quite negligible. It is also discovered that when Cd is substituted, the dielectric loss tangent reduces.
{"title":"Experimental investigation on ferrofluid properties of Cd doped Co-Zn ferrites","authors":"R. Manimegalai, S. Sendhilnathan, V. Chithambaram, M. Kumar","doi":"10.15251/djnb.2023.182.547","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.547","url":null,"abstract":"The Co-Zn ferrites 𝐶𝐶𝐶𝐶0.5𝑍𝑍𝑍𝑍0.5𝐶𝐶𝐶𝐶𝑥𝑥𝐹𝐹𝐹𝐹(2−𝑥𝑥)𝑂𝑂4 (x-0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by CO-precipitation method. The dielectric and structural properties has been investigated by effect of Cd doping in Co-Zn spinel ferrites. Dielectric constants were studied dependence of the frequency and temperature thus revealed that the dielectric dispersion based on the MaxwellWagner method polarizations are agreed with Koop’s conceptualization theory. Further, dielectric properties were studies over a frequency range from 10 kHZ to 30 MHZ. The dielectric constant is varied from 2.4 to 8.4 for real parts and 0.008 to 0.42 for imaginary parts, respectively. The tangent loss also recorded as 0.003 to 0.052 at 1 MHZ due to Co ions concentrations. In high and low frequencies of grain and grain boundary contribution is an important evident for obtained dielectric constant. The obtained values of coercivity (Hc) for these ferrites range between 280.4 Oe to 1380.3 Oe, based on VSM data. By converting Zn2+ and Cd2+ to cobalt magnetic ions it is possible to convert the magnetic properties of cobalt ferrite into a potential individual for numerous technical uses. The dielectric loss at room temperature and at high frequencies is found to be quite negligible. It is also discovered that when Cd is substituted, the dielectric loss tangent reduces.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135381673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.15251/djnb.2023.182.531
N. Ghamri, O. Kribaa, L. Zenkhri, H. Djouama
Monitoring the synthesis conditions of apatite phosphate by double decomposition seems very useful in view of the simplicity and rapidity of this method. This work is mainly based on production of apatite in the laboratory by the double decomposition method, HAP and TCP were synthesized and studied to demonstrate the influence of thermal treatment and synthesis temperature on the structure of apatite powders. The prepared samples were calcined at 900°C and sintered at 1050, 1100 and 1150°C. The effect of synthesis and sintering temperature on the structure of this material was investigated using XRD, FTIR, and SEM-EDX. This study confirmed that calcination has no effect on the HAP phase stability elaborated. Therefore,for TCP synthesized: β-TCP is the most phase that persists up to, 91% and a minimal partial transformation into Dicalcium Diphosphate is recorded. FTIR spectrum affirms the persistence of OH– and PO43- group bands suggestingthe basic apatite structure for HAP and TCP of the sample, calcination, leads to the crystallization of TCP Ca3(PO4)2. However, the calcined precipitate contains β calcium pyrophosphate Ca2P2O7, and HA:Ca10(PO4)6(OH) 2 constitutes secondary phase. While the calcination of HAP did not affect it. SEM micrograph of synthetic HAP powder treated at 1050°C revealed particle morphology with the dense and cloudy surface while TCP micrograph powder treated at the same temperature shows particle morphology of porous and smoother surfaces and irregular spherical shape. In conclusion thethermal treatments improve the performance of the bioceramic residueand have the potential to create a new type of sustainable and bio-friendly material. Hydroxyapatite and tricalcium phosphate likeotherrelated calcium phosphate minerals, have been used extensively as orthopedic implant material due to their excellent biocompatibility and bone bonding to its structural and composition alsimilarity to that of mineral phase of hard tissue in human bones.
{"title":"Effect of thermal treatment on the structural, morphological, and chemical properties of apatite bioceramicsmaterials","authors":"N. Ghamri, O. Kribaa, L. Zenkhri, H. Djouama","doi":"10.15251/djnb.2023.182.531","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.531","url":null,"abstract":"Monitoring the synthesis conditions of apatite phosphate by double decomposition seems very useful in view of the simplicity and rapidity of this method. This work is mainly based on production of apatite in the laboratory by the double decomposition method, HAP and TCP were synthesized and studied to demonstrate the influence of thermal treatment and synthesis temperature on the structure of apatite powders. The prepared samples were calcined at 900°C and sintered at 1050, 1100 and 1150°C. The effect of synthesis and sintering temperature on the structure of this material was investigated using XRD, FTIR, and SEM-EDX. This study confirmed that calcination has no effect on the HAP phase stability elaborated. Therefore,for TCP synthesized: β-TCP is the most phase that persists up to, 91% and a minimal partial transformation into Dicalcium Diphosphate is recorded. FTIR spectrum affirms the persistence of OH– and PO43- group bands suggestingthe basic apatite structure for HAP and TCP of the sample, calcination, leads to the crystallization of TCP Ca3(PO4)2. However, the calcined precipitate contains β calcium pyrophosphate Ca2P2O7, and HA:Ca10(PO4)6(OH) 2 constitutes secondary phase. While the calcination of HAP did not affect it. SEM micrograph of synthetic HAP powder treated at 1050°C revealed particle morphology with the dense and cloudy surface while TCP micrograph powder treated at the same temperature shows particle morphology of porous and smoother surfaces and irregular spherical shape. In conclusion thethermal treatments improve the performance of the bioceramic residueand have the potential to create a new type of sustainable and bio-friendly material. Hydroxyapatite and tricalcium phosphate likeotherrelated calcium phosphate minerals, have been used extensively as orthopedic implant material due to their excellent biocompatibility and bone bonding to its structural and composition alsimilarity to that of mineral phase of hard tissue in human bones.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47993556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.15251/djnb.2023.181.389
F. Göde, N. Balpınar
Dye-sensitized solar cells (DSSC) were designed utilizing pure and copper-doped zinc oxide (ZnO:Cu) nanoparticles and the dye extracted from dried Hypericum perforatum L. (H. perforatum) flowers. The ZnO:Cu thin films were grown using the successive ionic layer adsorption and reaction (SILAR) method on tin-doped indium oxide-coated (ITO) glass substrates at 85 °C. Regarding the molar ratio of Cu ions to Zn ions, Cu had a doping concentration of 0.5%, 1%, and 2%. The crystalline nature, morphological, compositional, and optical properties of the synthesized ZnO:Cu thin films were studied using an X-ray diffractometer (XRD), a scanning electron microscope (SEM), energy dispersive x-ray spectrometry (EDS), UV-vis spectroscopy, and Fourier transformation infrared (FTIR) spectroscopy. The SEM results indicated the formation of a porous structure on the surface of ZnO:Cu thin films, which provided more active sites for dye molecules and electrolyte ions. A DSSC, produced by using a pure ZnO thin film, showed a current density (Jsc) of 7.66 mA/cm2 with an open-circuit voltage (Voc) of 0.98 V and an overall efficiency (η) of 2.47%
{"title":"Dye-sensitized solar cells fabricated using ZnO:Cu thin films and dye extracted from Hypericum perforatum L. flowers","authors":"F. Göde, N. Balpınar","doi":"10.15251/djnb.2023.181.389","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.389","url":null,"abstract":"Dye-sensitized solar cells (DSSC) were designed utilizing pure and copper-doped zinc oxide (ZnO:Cu) nanoparticles and the dye extracted from dried Hypericum perforatum L. (H. perforatum) flowers. The ZnO:Cu thin films were grown using the successive ionic layer adsorption and reaction (SILAR) method on tin-doped indium oxide-coated (ITO) glass substrates at 85 °C. Regarding the molar ratio of Cu ions to Zn ions, Cu had a doping concentration of 0.5%, 1%, and 2%. The crystalline nature, morphological, compositional, and optical properties of the synthesized ZnO:Cu thin films were studied using an X-ray diffractometer (XRD), a scanning electron microscope (SEM), energy dispersive x-ray spectrometry (EDS), UV-vis spectroscopy, and Fourier transformation infrared (FTIR) spectroscopy. The SEM results indicated the formation of a porous structure on the surface of ZnO:Cu thin films, which provided more active sites for dye molecules and electrolyte ions. A DSSC, produced by using a pure ZnO thin film, showed a current density (Jsc) of 7.66 mA/cm2 with an open-circuit voltage (Voc) of 0.98 V and an overall efficiency (η) of 2.47%","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49597310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.15251/djnb.2023.181.403
W. Iqbal, M. Mekki, W. Rehman, B. Shahzad, U. Anwar, S. Mahmood, M. E. Talukder
TiO2/Co3O4 core-shell nanoparticles were successfully synthesized by the sol-gel method in two steps: the first step is the sol-gel synthesis of Co3O4 nanoparticles, and the second step is the synthesis of TiO2/Co3O4 nanoparticles by sol-gel method. The obtained Co3O4 and TiO2/Co3O4 core-shell nanoparticles were investigated utilizing X-ray diffraction, scanning electron microscopy, Fourier transforms infrared spectroscopy, diffuse reflectance spectroscopy, and conductivity measurement. X-ray diffraction analysis showed the presence of both Co3O4 and TiO2 phases in TiO2/Co3O4 core-shell nanoparticles; co3o4 nanoparticles have a cubic shape, and TiO2 nanoparticles have a tetragonal shape. SEM images of Co3O4 nanoparticles show most of the particles are smoothly distributed, having separate boundaries, and images of TiO2/Co3O4 nanoparticles showed that with an increase in calcination temperature, the size of the core-shell nanoparticles also increases. FTIR spectrum of both confirms the synthesis of Co3O4 and TiO2/Co3O4 nanomaterials. Diffuse reflectance spectroscopy exhibited the band gaps of TiO2/Co3O4 core-shell nanoparticles decrease with the increase of the temperature. The conductivity of the TiO2/Co3O4 core-shell nanomaterials increases with an increase in temperature and also with an increase in frequency.
{"title":"Electrical properties of TiO2/CO3O4 core/shell nanoparticles synthesized by sol-gel method","authors":"W. Iqbal, M. Mekki, W. Rehman, B. Shahzad, U. Anwar, S. Mahmood, M. E. Talukder","doi":"10.15251/djnb.2023.181.403","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.403","url":null,"abstract":"TiO2/Co3O4 core-shell nanoparticles were successfully synthesized by the sol-gel method in two steps: the first step is the sol-gel synthesis of Co3O4 nanoparticles, and the second step is the synthesis of TiO2/Co3O4 nanoparticles by sol-gel method. The obtained Co3O4 and TiO2/Co3O4 core-shell nanoparticles were investigated utilizing X-ray diffraction, scanning electron microscopy, Fourier transforms infrared spectroscopy, diffuse reflectance spectroscopy, and conductivity measurement. X-ray diffraction analysis showed the presence of both Co3O4 and TiO2 phases in TiO2/Co3O4 core-shell nanoparticles; co3o4 nanoparticles have a cubic shape, and TiO2 nanoparticles have a tetragonal shape. SEM images of Co3O4 nanoparticles show most of the particles are smoothly distributed, having separate boundaries, and images of TiO2/Co3O4 nanoparticles showed that with an increase in calcination temperature, the size of the core-shell nanoparticles also increases. FTIR spectrum of both confirms the synthesis of Co3O4 and TiO2/Co3O4 nanomaterials. Diffuse reflectance spectroscopy exhibited the band gaps of TiO2/Co3O4 core-shell nanoparticles decrease with the increase of the temperature. The conductivity of the TiO2/Co3O4 core-shell nanomaterials increases with an increase in temperature and also with an increase in frequency.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49160725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.15251/djnb.2023.181.411
G. Matei, S. Matei, G. Cogălniceanu
The present study aimed to mycosynthesize silver nanoparticles (AgNPs) by Aspergillus flavus and to assess their antifungal activity. The presence of AgNPs was certified by colour change from yellow to brown and by the maximum absorbance at 420 nm, because of Surface Plasmon resonance. Transmission Electron Microscopy images revealed the aproximately spherical shape of AgNPs, dimensions ranging between 3.3 and 40 nm, crystalline structure and a good dispersion. AgNPs presented antifungal activity against Aspergillus ochraceus and Penicillium expansum but totally inhibited Fusarium oxysporum. Minimum inhibitory concentration (MIC) varied from 7.5 (Penicillium expansum and Fusarium oxysporum) to 12.5 μg/mL (Aspergillus ochraceus).
{"title":"Mycosynthesis of silver nanoparticles by Aspergillus flavus : characterization and antifungal activity","authors":"G. Matei, S. Matei, G. Cogălniceanu","doi":"10.15251/djnb.2023.181.411","DOIUrl":"https://doi.org/10.15251/djnb.2023.181.411","url":null,"abstract":"The present study aimed to mycosynthesize silver nanoparticles (AgNPs) by Aspergillus flavus and to assess their antifungal activity. The presence of AgNPs was certified by colour change from yellow to brown and by the maximum absorbance at 420 nm, because of Surface Plasmon resonance. Transmission Electron Microscopy images revealed the aproximately spherical shape of AgNPs, dimensions ranging between 3.3 and 40 nm, crystalline structure and a good dispersion. AgNPs presented antifungal activity against Aspergillus ochraceus and Penicillium expansum but totally inhibited Fusarium oxysporum. Minimum inhibitory concentration (MIC) varied from 7.5 (Penicillium expansum and Fusarium oxysporum) to 12.5 μg/mL (Aspergillus ochraceus).","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47520868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-01DOI: 10.15251/djnb.2023.182.511
M. B. Hossain, K. Alsalem, K. Ahmed, F. M. Bui, S. M. Ibrahim, S. Patel
A PCF sensor is proposed for chemical (e.g., glycerol, acetic acid, and water) sensing through Zeonex fiber material. We investigate relative sensitivity, effective are, effective material loss, and confinement loss to analyze the sensor performance. The proposed sensor offers the relative sensitivity of almost 97.7% for glycerol, 96.25% for acetic acid, 95.28% for water at frequency 3.5 THz. In addition, the sensor possesses small effective material loss and tiny confinement loss that are important characteristics of an efficient chemical sensor. Furthermore, the modern fabrication techniques are well fitting for the fabrication of the presented sensor.
{"title":"Terahertz detection of chemicals through zeonex fiber material","authors":"M. B. Hossain, K. Alsalem, K. Ahmed, F. M. Bui, S. M. Ibrahim, S. Patel","doi":"10.15251/djnb.2023.182.511","DOIUrl":"https://doi.org/10.15251/djnb.2023.182.511","url":null,"abstract":"A PCF sensor is proposed for chemical (e.g., glycerol, acetic acid, and water) sensing through Zeonex fiber material. We investigate relative sensitivity, effective are, effective material loss, and confinement loss to analyze the sensor performance. The proposed sensor offers the relative sensitivity of almost 97.7% for glycerol, 96.25% for acetic acid, 95.28% for water at frequency 3.5 THz. In addition, the sensor possesses small effective material loss and tiny confinement loss that are important characteristics of an efficient chemical sensor. Furthermore, the modern fabrication techniques are well fitting for the fabrication of the presented sensor.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42853369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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：