Pub Date : 2023-07-01DOI: 10.15251/djnb.2023.183.975
F. Ullah, I. Ahmad, S. Zaib, M. Abrar, M. Khalil, M. Ebdah, S. Ramay, M. Saleem
In the current study, Ni doped CoFe2O4 nanoparticles were fabricated using well-known hydrothermal method. The structural, morphological, optical, and antibacterial activity were analyzed through the latest analytical techniques. The Fd-cubic spinel crystal structure was observed with variations in crystallite sizes and lattice parameters of synthesized samples. The growth of spherical and uniform nanoparticles with the presence of expected elements are observed from field emission scanning electron microscopy and energy dispersive x-rays analysis, respectively. A broad absorption band was shown in UV-visible absorption spectroscopy in the wavelength range of 200-320 nm. A significant increase in the energy band gap was observed from 2.98 eV to 3.56 eV as the concentration of dopant increased from 2% to 6%. The antibacterial activities of the samples were investigated against Staph aureus, Pseudomonas aeruginosa and E. Coli through the well-known Agar well diffusion method. The pure and Ni-doped CoFe2O4 exhibits a maximum zone of inhibition (3-25 mm), proposing that these materials are efficient against bacterial resistance. Further, the enhancement in value of the inhibition zone by substitution of Ni at cobalt sites recommended that it is a potential candidate for biomedical applications and can be highly effective against the high resistance of different bacteria.
{"title":"A comprehensive study on Ni-Doped cobalt ferrites for optical response and anti-bacterial activity","authors":"F. Ullah, I. Ahmad, S. Zaib, M. Abrar, M. Khalil, M. Ebdah, S. Ramay, M. Saleem","doi":"10.15251/djnb.2023.183.975","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.975","url":null,"abstract":"In the current study, Ni doped CoFe2O4 nanoparticles were fabricated using well-known hydrothermal method. The structural, morphological, optical, and antibacterial activity were analyzed through the latest analytical techniques. The Fd-cubic spinel crystal structure was observed with variations in crystallite sizes and lattice parameters of synthesized samples. The growth of spherical and uniform nanoparticles with the presence of expected elements are observed from field emission scanning electron microscopy and energy dispersive x-rays analysis, respectively. A broad absorption band was shown in UV-visible absorption spectroscopy in the wavelength range of 200-320 nm. A significant increase in the energy band gap was observed from 2.98 eV to 3.56 eV as the concentration of dopant increased from 2% to 6%. The antibacterial activities of the samples were investigated against Staph aureus, Pseudomonas aeruginosa and E. Coli through the well-known Agar well diffusion method. The pure and Ni-doped CoFe2O4 exhibits a maximum zone of inhibition (3-25 mm), proposing that these materials are efficient against bacterial resistance. Further, the enhancement in value of the inhibition zone by substitution of Ni at cobalt sites recommended that it is a potential candidate for biomedical applications and can be highly effective against the high resistance of different bacteria.","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":"46552929","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.2023.183.881
N. A. Ahmad, A. K. Ali, S. H. Mahdi
Researchers have been looking into ways to cut down on energy waste in transportation and manufacturing in response to the poor value of energy production as a basic tenet of renewable energy producing facilities. Heat loss due to the electrical resistance of materials is the primary source of energy waste in electrical systems. There are a plethora of studies aimed at lowering material resistance, and the best approach involves the use of superconductor's materials. The number of possible strategies for improving the superconductor's electrical and structural characteristics is overwhelming. Using XRD analysis, a scanning electron microscope, electron dispersive spectroscopy, and the fourprobe technique, the authors of this paper report on their findings regarding the effect electrical and structural characteristics for laser-irradiated materials of the Bi2Sr2- xYxCa2Cu3-yNiyO10+δ compound over a period of 60 seconds. X-ray diffraction studies demonstrated that the crystal structure of the material did not change before and after laser irradiation; both the unirradiated and laser-irradiated samples were found to have an orthorhombic crystal structure. Using the four-probe approach, we looked at how irradiation affected the critical temperature of the specimens we produced. According to the findings of the tests, all of the specimens changed after being subjected to the laser light, with the critical temperature rising by 139 K, 147 K, and 145 K, respectively
研究人员一直在寻找减少运输和制造业能源浪费的方法，以应对能源生产的低价值，这是可再生能源生产设施的基本原则。材料电阻引起的热损失是电力系统中能源浪费的主要来源。有大量的研究旨在降低材料的电阻，而最好的方法涉及到超导体材料的使用。改善超导体的电学和结构特性的可能策略的数量是压倒性的。利用x射线衍射分析、扫描电子显微镜、电子色散光谱和四探针技术，研究了Bi2Sr2- xYxCa2Cu3-yNiyO10+δ化合物在60秒内对激光辐照材料的电学和结构特性的影响。x射线衍射研究表明，激光辐照前后材料的晶体结构没有变化;未辐照和激光辐照样品均具有正交晶型结构。使用四探针方法，我们观察了辐照如何影响我们生产的样品的临界温度。根据试验结果，所有试样在激光照射后都发生了变化，临界温度分别升高了139 K、147 K和145 K
{"title":"Effect of the laser CO2 properties on the superconducting nanocomposite Bi2Sr2-xYxCa2Cu3-yNiyO10+d at high temperatures","authors":"N. A. Ahmad, A. K. Ali, S. H. Mahdi","doi":"10.15251/djnb.2023.183.881","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.881","url":null,"abstract":"Researchers have been looking into ways to cut down on energy waste in transportation and manufacturing in response to the poor value of energy production as a basic tenet of renewable energy producing facilities. Heat loss due to the electrical resistance of materials is the primary source of energy waste in electrical systems. There are a plethora of studies aimed at lowering material resistance, and the best approach involves the use of superconductor's materials. The number of possible strategies for improving the superconductor's electrical and structural characteristics is overwhelming. Using XRD analysis, a scanning electron microscope, electron dispersive spectroscopy, and the fourprobe technique, the authors of this paper report on their findings regarding the effect electrical and structural characteristics for laser-irradiated materials of the Bi2Sr2- xYxCa2Cu3-yNiyO10+δ compound over a period of 60 seconds. X-ray diffraction studies demonstrated that the crystal structure of the material did not change before and after laser irradiation; both the unirradiated and laser-irradiated samples were found to have an orthorhombic crystal structure. Using the four-probe approach, we looked at how irradiation affected the critical temperature of the specimens we produced. According to the findings of the tests, all of the specimens changed after being subjected to the laser light, with the critical temperature rising by 139 K, 147 K, and 145 K, respectively","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":"48608490","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.2023.183.951
T. Varunkumar, M. Jayaraj, R. Sivakumar, N. Manikandan
In this work, composite materials were developed using compression moulding method, which the composition of M2A1C (Epoxy + 2 wt % MWCNT +1 wt % Al2O3), M2A1.5C (Epoxy + 2 wt % MWCNT +1.5 wt % Al2O3) and M2A1C (Epoxy + 2 wt % MWCNT +2 wt % Al2O3). From the composition, M2A1.5C had improved the mechanical properties of 30%, 24% and 28% in tensile strength, flexural strength and impact strength, respectively, compared to the M2A1C. From the thermo-gravimetric examination, the critical change was happened during increasing of Al2O3, however, the M2A1.5C had a significant improvement within the residual mass and maximum temperature decomposition with compared to other composites. Hydrophobicity decreased in the M2A1C composition, due to the low density of the material in the composite. The study is exploring ways to improve the polymer-metal matrix hybrid composite materials to make them lighter and more affordable, as well as easier to use in light load applications.
{"title":"Investigation of mechanical, thermal and water absorption behaviour of MWCNT’s with AL2O3 reinforced polymer composite","authors":"T. Varunkumar, M. Jayaraj, R. Sivakumar, N. Manikandan","doi":"10.15251/djnb.2023.183.951","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.951","url":null,"abstract":"In this work, composite materials were developed using compression moulding method, which the composition of M2A1C (Epoxy + 2 wt % MWCNT +1 wt % Al2O3), M2A1.5C (Epoxy + 2 wt % MWCNT +1.5 wt % Al2O3) and M2A1C (Epoxy + 2 wt % MWCNT +2 wt % Al2O3). From the composition, M2A1.5C had improved the mechanical properties of 30%, 24% and 28% in tensile strength, flexural strength and impact strength, respectively, compared to the M2A1C. From the thermo-gravimetric examination, the critical change was happened during increasing of Al2O3, however, the M2A1.5C had a significant improvement within the residual mass and maximum temperature decomposition with compared to other composites. Hydrophobicity decreased in the M2A1C composition, due to the low density of the material in the composite. The study is exploring ways to improve the polymer-metal matrix hybrid composite materials to make them lighter and more affordable, as well as easier to use in light load applications.","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":"43174239","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.2023.183.933
C. Kumar, B. Bhusan, A. K. Sinha, A. Jha, S. Sinha
{"title":"Scandium and niobium incorporated lithium titanate as the anode for Li-ion batteries","authors":"C. Kumar, B. Bhusan, A. K. Sinha, A. Jha, S. Sinha","doi":"10.15251/djnb.2023.183.933","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.933","url":null,"abstract":"","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":"48712878","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.2023.183.859
M. S. Viswaksenan, A. Simi, A. Panneerselvam
In this study, samarium and aluminium codoped zinc oxide nanostructures were produced via a soft chemical route, and their structural, morphological, optical, and photocatalytic capabilities were investigated. X-ray diffraction (XRD) patterns and photoluminescence (PL) studies show that both undoped and Sm & Al codoped ZnO nanostructures have a hexagonal wurtzite crystal structure. The shape of the sample's hexagonal nanostructures, as seen in FESEM pictures, changes as the amount of Sm3+ doping increases. Sm3+ and Al2+ ions have been incorporated into ZnO, as seen by the EDX spectra. ZnO nanostructures were thoroughly studied to learn how Al2+ and Sm3+ doping affected their structure, shape, absorption, emission, and photocatalytic activity. The capacity to absorb visible light is enhanced by the incorporation of Sm3+ ions, which causes a red shift in the optical energy band gap from 2.5 to 3.2 eV. Based on the results of in-depth photocatalytic tests, it has been shown that Sm & Al codoped ZnO nanostructures exhibit the highest photodegradation efficiency for RhB dye for Sm0.04MAl0.04MZn0.92MO, i.e. 84%, when exposed to visible light. ZnO, when doped with a rare earth metal ion (Sm3+), displays enhanced photocatalytic efficiency and might have real-world uses. In this research, nanoscale photocatalysts, as manufactured, degrade RhB dye effectively as a photocatalyst
{"title":"Novel rare earth metal and aluminium codoped ZnO photocatalysts for degradation of rhodamine b dye","authors":"M. S. Viswaksenan, A. Simi, A. Panneerselvam","doi":"10.15251/djnb.2023.183.859","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.859","url":null,"abstract":"In this study, samarium and aluminium codoped zinc oxide nanostructures were produced via a soft chemical route, and their structural, morphological, optical, and photocatalytic capabilities were investigated. X-ray diffraction (XRD) patterns and photoluminescence (PL) studies show that both undoped and Sm & Al codoped ZnO nanostructures have a hexagonal wurtzite crystal structure. The shape of the sample's hexagonal nanostructures, as seen in FESEM pictures, changes as the amount of Sm3+ doping increases. Sm3+ and Al2+ ions have been incorporated into ZnO, as seen by the EDX spectra. ZnO nanostructures were thoroughly studied to learn how Al2+ and Sm3+ doping affected their structure, shape, absorption, emission, and photocatalytic activity. The capacity to absorb visible light is enhanced by the incorporation of Sm3+ ions, which causes a red shift in the optical energy band gap from 2.5 to 3.2 eV. Based on the results of in-depth photocatalytic tests, it has been shown that Sm & Al codoped ZnO nanostructures exhibit the highest photodegradation efficiency for RhB dye for Sm0.04MAl0.04MZn0.92MO, i.e. 84%, when exposed to visible light. ZnO, when doped with a rare earth metal ion (Sm3+), displays enhanced photocatalytic efficiency and might have real-world uses. In this research, nanoscale photocatalysts, as manufactured, degrade RhB dye effectively as a photocatalyst","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":"44040772","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.2023.183.961
J. S. Zhang, Z. Fang, L. Wang, Z. Chen, Y. Zhou, M. Liang, S. J. Huang
In order to understand the adsorption and release properties of β-phenylethanol on activated carbon produced from different carbon sources, coconut shell activated carbon (CAC) and petroleum coke activated carbon (PAC) were selected for the immobilization β-phenylethanol. The structure and morphology of CAC and PAC were characterized by SEM, BET and TGA analysis. And then the effect of carbon sources and pore structure on β-phenylethanol adsorption and release properties were investigated by kinetic model. The results showed that the microporosity ratios for CAC and PAC were 89.13% and 77.12%, respectively, and both types of activated carbon were dominated by micropore structure. The adsorption behavior of β-phenylethanol on the CAC and PAC was both controlled by the physical adsorption, and the equilibrium adsorption capacity of CAC (391.2 mg/g) was 45.50% of that of PAC (859.8mg/g). Quasi primary equation can be used to describe the adsorption of β-phenylethanol on both types of activated carbon, i.e., the external transport resistance plays a major role in the adsorption process. The results of thermogravimetric analysis showed that the thermal stability of β-phenylethanol was obviously improved after the immobilization into activated carbon, accompanied with a higher temperature intervals for the release process and a decreased release rate. And the thermal stability of CAC loaded with β-phenylethanol was higher than that of PAC. Furthermore, the sustained release of β-phenylethanol from CAC and PAC was more consistent with the Korsmeyer-Peppas model and was dominated by Fick diffusion. The release rates of β-phenylethanol were 27.34% and 57.57% for CAC and PAC, respectively, under 35 days of storage at room temperature. The higher micropore ratio and lower mean pore width of CAC were responsible for the good stability and sustained release properties of immobilized β-phenylethanol.
{"title":"Comparative analysis of adsorption and release properties of β-phenylethanol on two kinds of activated carbon","authors":"J. S. Zhang, Z. Fang, L. Wang, Z. Chen, Y. Zhou, M. Liang, S. J. Huang","doi":"10.15251/djnb.2023.183.961","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.961","url":null,"abstract":"In order to understand the adsorption and release properties of β-phenylethanol on activated carbon produced from different carbon sources, coconut shell activated carbon (CAC) and petroleum coke activated carbon (PAC) were selected for the immobilization β-phenylethanol. The structure and morphology of CAC and PAC were characterized by SEM, BET and TGA analysis. And then the effect of carbon sources and pore structure on β-phenylethanol adsorption and release properties were investigated by kinetic model. The results showed that the microporosity ratios for CAC and PAC were 89.13% and 77.12%, respectively, and both types of activated carbon were dominated by micropore structure. The adsorption behavior of β-phenylethanol on the CAC and PAC was both controlled by the physical adsorption, and the equilibrium adsorption capacity of CAC (391.2 mg/g) was 45.50% of that of PAC (859.8mg/g). Quasi primary equation can be used to describe the adsorption of β-phenylethanol on both types of activated carbon, i.e., the external transport resistance plays a major role in the adsorption process. The results of thermogravimetric analysis showed that the thermal stability of β-phenylethanol was obviously improved after the immobilization into activated carbon, accompanied with a higher temperature intervals for the release process and a decreased release rate. And the thermal stability of CAC loaded with β-phenylethanol was higher than that of PAC. Furthermore, the sustained release of β-phenylethanol from CAC and PAC was more consistent with the Korsmeyer-Peppas model and was dominated by Fick diffusion. The release rates of β-phenylethanol were 27.34% and 57.57% for CAC and PAC, respectively, under 35 days of storage at room temperature. The higher micropore ratio and lower mean pore width of CAC were responsible for the good stability and sustained release properties of immobilized β-phenylethanol.","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":"45647347","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.2023.183.941
E. M. López Alejandro, E. Ramírez Morales, M. C. Arellano Cortaza, J. P. Morán Lázaro, G. Pérez Hernández, L. Rojas Blanco
Ag-ZnO/MWCNT composites were obtained by microwave-assisted, varying-charge synthesis of multiwalled carbon nanotubes (MWCNT). The structural, morphological and optical properties were characterized by: XRD, SEM, TEM, Physisorption of N2 and UVVis. The incorporation of Ag ions and MWNTC caused changes in the structure tension and in the average crystallite size of ZnO. The micrographs revealed that ZnO agglomerates were distributed on the MWNTC and that Ag particles were deposited on the surface of the heterostructure, thus the energy gap decreased. The percentages of degradation of methylene blue were 98 and 75% under ultraviolet and visible radiation, respectively, in the Ag-ZnO/CNT composites.
{"title":"Synthesis of Ag-modified ZnO/MWCNT nanoparticles and their application as a catalyst in the degradation of methylene blue","authors":"E. M. López Alejandro, E. Ramírez Morales, M. C. Arellano Cortaza, J. P. Morán Lázaro, G. Pérez Hernández, L. Rojas Blanco","doi":"10.15251/djnb.2023.183.941","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.941","url":null,"abstract":"Ag-ZnO/MWCNT composites were obtained by microwave-assisted, varying-charge synthesis of multiwalled carbon nanotubes (MWCNT). The structural, morphological and optical properties were characterized by: XRD, SEM, TEM, Physisorption of N2 and UVVis. The incorporation of Ag ions and MWNTC caused changes in the structure tension and in the average crystallite size of ZnO. The micrographs revealed that ZnO agglomerates were distributed on the MWNTC and that Ag particles were deposited on the surface of the heterostructure, thus the energy gap decreased. The percentages of degradation of methylene blue were 98 and 75% under ultraviolet and visible radiation, respectively, in the Ag-ZnO/CNT composites.","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":"45996987","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.2023.183.985
D. Vasudevan, A. Kumaravel, A. Murugesan, A. Mugil, B. Karthi, K. K. Kumar
This article outlines the preparation and exfoliation of graphitic-carbon nitride (GCN) by thermal polymerization technique using urea proceeded by the hydrothermal approach for the application of corrosion resistance in radiators. The prepared sample was characterized by using various methods. X-ray powder diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) confirmed the purity of GCN, and Surface morphology results revealed the formation of spherical-shaped GCN. Herein, graphitic carbon nitride (GCN) was synthesized to enhance its corrosion-resistance performance on mild steel (MS) under a seawater atmosphere. The corrosion behaviour of the graphitic-carbon nitride (GCN) synthesized by the hydrothermal method was examined by conducting electrochemical corrosion tests in a 3.5% NaCl medium under three different temperatures. The excellent temperature dependant electro-catalytic activity of the prepared GCN was analysed. The hydrothermal exfoliation process highly enhances the structural, optical, and electrochemical properties like corrosion resistance and stability of the prepared GCN. This study demonstrates that hydrothermally exfoliated GCN exhibits low corrosion rates and high electrochemical corrosion resistance, which could be a potential candidate for corrosion inhibitors in radiators.
{"title":"Exfoliated carbon nitrides for corrosion prevention in radiators: Temperature-dependent corrosion analysis","authors":"D. Vasudevan, A. Kumaravel, A. Murugesan, A. Mugil, B. Karthi, K. K. Kumar","doi":"10.15251/djnb.2023.183.985","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.985","url":null,"abstract":"This article outlines the preparation and exfoliation of graphitic-carbon nitride (GCN) by thermal polymerization technique using urea proceeded by the hydrothermal approach for the application of corrosion resistance in radiators. The prepared sample was characterized by using various methods. X-ray powder diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) confirmed the purity of GCN, and Surface morphology results revealed the formation of spherical-shaped GCN. Herein, graphitic carbon nitride (GCN) was synthesized to enhance its corrosion-resistance performance on mild steel (MS) under a seawater atmosphere. The corrosion behaviour of the graphitic-carbon nitride (GCN) synthesized by the hydrothermal method was examined by conducting electrochemical corrosion tests in a 3.5% NaCl medium under three different temperatures. The excellent temperature dependant electro-catalytic activity of the prepared GCN was analysed. The hydrothermal exfoliation process highly enhances the structural, optical, and electrochemical properties like corrosion resistance and stability of the prepared GCN. This study demonstrates that hydrothermally exfoliated GCN exhibits low corrosion rates and high electrochemical corrosion resistance, which could be a potential candidate for corrosion inhibitors in radiators.","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":"43365998","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.2023.183.995
Z. Ullah, M. Qureshi, K. Sultana, F. Ullah, A. Khalid, N. Masood, F. Abdella, S. Elhag
In this work, Pure and aluminum doped zinc oxide nanostructures were successfully synthesized through a well-established hydrothermal method. The hexagonal wurtzite structure, and nano porous shape for Al dopant in ZnO were confirmed via XRD and SEM analysis. The reduction in energy band gap (3.40 to 3.19 eV) for Al dopant samples and enhancement in inhibition zones (7 mm- 17 mm) for pure and Al-doped ZnO were recorded. The photocatalytic activity of Al doped ZnO was shown to be several times more efficient than in prior studies. The enhancement in these parameters suggest that these materials are good candidates for biomedical and optoelectronic applications.
{"title":"Al-ions effect on structural, optical, antibacterial, and photocatalytic activities of ZnO nanostructures","authors":"Z. Ullah, M. Qureshi, K. Sultana, F. Ullah, A. Khalid, N. Masood, F. Abdella, S. Elhag","doi":"10.15251/djnb.2023.183.995","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.995","url":null,"abstract":"In this work, Pure and aluminum doped zinc oxide nanostructures were successfully synthesized through a well-established hydrothermal method. The hexagonal wurtzite structure, and nano porous shape for Al dopant in ZnO were confirmed via XRD and SEM analysis. The reduction in energy band gap (3.40 to 3.19 eV) for Al dopant samples and enhancement in inhibition zones (7 mm- 17 mm) for pure and Al-doped ZnO were recorded. The photocatalytic activity of Al doped ZnO was shown to be several times more efficient than in prior studies. The enhancement in these parameters suggest that these materials are good candidates for biomedical and optoelectronic applications.","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":"48053902","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.2023.183.915
G. Anitha, R. Jothiramalingam, M. Sukumar, A. Roniboss, S. Yuvaraj, G. Ramkumar, M. Sundararajan, S. Arokiyaraj
Strontium substituted CoAl2O4 nanoparticles were prepared using a microwave combustion technique using L-alanine as a fuel. The following techniques were used to test the synthesized samples such as XRD, HR-SEM, EDX, DRS, FT-IR and VSM respectively.. Surface morphology showed nanosized crystalline grains agglomerated with flake-like and nano-sized pores are fused grain boundaries. The band gap was calculated using Kubelka-Munk (K-M) function and it is reduced from 3.32 to 3.18 eV. The Ft-IR bands ranging from 560 to 1100 cm-1 are caused by the cubic structure of Sr2+ doped CoAl2O4 nanoparticles(NPs). The bi-functional NPs CoAl2O4/SrO (x = 0.5) exhibited excellent catalytic performance and better conversion efficiency (conversion 98% and selectivity 95%) for glycerol
{"title":"Influence of Sr2+ substitution on structural, optical and catalytic properties of CoAl2O4 nanoparticles","authors":"G. Anitha, R. Jothiramalingam, M. Sukumar, A. Roniboss, S. Yuvaraj, G. Ramkumar, M. Sundararajan, S. Arokiyaraj","doi":"10.15251/djnb.2023.183.915","DOIUrl":"https://doi.org/10.15251/djnb.2023.183.915","url":null,"abstract":"Strontium substituted CoAl2O4 nanoparticles were prepared using a microwave combustion technique using L-alanine as a fuel. The following techniques were used to test the synthesized samples such as XRD, HR-SEM, EDX, DRS, FT-IR and VSM respectively.. Surface morphology showed nanosized crystalline grains agglomerated with flake-like and nano-sized pores are fused grain boundaries. The band gap was calculated using Kubelka-Munk (K-M) function and it is reduced from 3.32 to 3.18 eV. The Ft-IR bands ranging from 560 to 1100 cm-1 are caused by the cubic structure of Sr2+ doped CoAl2O4 nanoparticles(NPs). The bi-functional NPs CoAl2O4/SrO (x = 0.5) exhibited excellent catalytic performance and better conversion efficiency (conversion 98% and selectivity 95%) for glycerol","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":"48227972","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}
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