Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1461
K. Y. Li, Y. Zhou, H. Y. Wang, L. K. Zhou, S. P. Zhang, Y. Lian
CdxZn1-xS (x=0~1) solid solution photocatalyst with different morphologies was synthesized by solvothermal method using ethylenediamine as solvent. The light absorption of the photocatalyst was varied by changing the morphology and electronic band structure to allow strong visible light response for hydrogen generation. The results showed that the optimum sample Cd0.5Zn0.5S showed a high hydrogen production rate of 2531.3 μmol·g-1 ·h-1 with lactic acid as sacrificial agent. Loading with NiS by solvothermal method further improves the hydrogen production performance. The photocatalytic hydrogen evolution rate of NiS/Cd0.5Zn0.5S is 4547.5 μmol·g-1 ·h-1 , which is 1.80 times that of pure Cd0.5Zn0.5S. The mechanism of hydrogen production by NiS/Cd0.5Zn0.5S is also discussed.
{"title":"The construction of CdxZn1-xS-based photocatalysts for enhanced hydrogen generation","authors":"K. Y. Li, Y. Zhou, H. Y. Wang, L. K. Zhou, S. P. Zhang, Y. Lian","doi":"10.15251/djnb.2023.184.1461","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1461","url":null,"abstract":"CdxZn1-xS (x=0~1) solid solution photocatalyst with different morphologies was synthesized by solvothermal method using ethylenediamine as solvent. The light absorption of the photocatalyst was varied by changing the morphology and electronic band structure to allow strong visible light response for hydrogen generation. The results showed that the optimum sample Cd0.5Zn0.5S showed a high hydrogen production rate of 2531.3 μmol·g-1 ·h-1 with lactic acid as sacrificial agent. Loading with NiS by solvothermal method further improves the hydrogen production performance. The photocatalytic hydrogen evolution rate of NiS/Cd0.5Zn0.5S is 4547.5 μmol·g-1 ·h-1 , which is 1.80 times that of pure Cd0.5Zn0.5S. The mechanism of hydrogen production by NiS/Cd0.5Zn0.5S is also discussed.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"22 20","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603211","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1485
N. A. Amaran, N. Ibrahim, Z. Mohamed
Pr0.67Ba0.33Mn1-xTixO3 (x = 0 and 0.02) were synthesized using a conventional solid-state synthesis method to investigate the effect of Ti substitution on their magnetic and electrical transport properties. All the samples were structurally evaluated by XRD diffraction Rietveld refinement method which showed an increase in unit cell volume with increasing Ni content, indicating that Ti is partially substituted at Mn. Scanning electron microscopy (SEM) and energy dispersive X-tray (EDX) are used to examine the surface morphology and identified elements in the samples' compounds. Fourier transform infrared spectroscopy (FTIR) reveals that all the samples exhibit a transmission band in the range of 590 cm-1 - 610 cm-1 . For x = 0, magnetization measurements showed paramagnetic (PM) to ferromagnetic (FM) transition at the transition temperature, TC ∼ 213 K. For Ti-substituted samples, ferromagnetic (FM) to PM transition was reduced with Curie temperature (TC), decreasing from 213 K (x = 0) to 205 K (x = 0.02). On the other hand, the M(H) showed the presence of a linear graph for x = 0 and x = 0.02 which may be related to the presence of paramagnetic at room temperature.
{"title":"Investigation of crystal structural and magnetic properties of titanium doped Pr0.67Ba0.33MnO3 perovskite manganites","authors":"N. A. Amaran, N. Ibrahim, Z. Mohamed","doi":"10.15251/djnb.2023.184.1485","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1485","url":null,"abstract":"Pr0.67Ba0.33Mn1-xTixO3 (x = 0 and 0.02) were synthesized using a conventional solid-state synthesis method to investigate the effect of Ti substitution on their magnetic and electrical transport properties. All the samples were structurally evaluated by XRD diffraction Rietveld refinement method which showed an increase in unit cell volume with increasing Ni content, indicating that Ti is partially substituted at Mn. Scanning electron microscopy (SEM) and energy dispersive X-tray (EDX) are used to examine the surface morphology and identified elements in the samples' compounds. Fourier transform infrared spectroscopy (FTIR) reveals that all the samples exhibit a transmission band in the range of 590 cm-1 - 610 cm-1 . For x = 0, magnetization measurements showed paramagnetic (PM) to ferromagnetic (FM) transition at the transition temperature, TC ∼ 213 K. For Ti-substituted samples, ferromagnetic (FM) to PM transition was reduced with Curie temperature (TC), decreasing from 213 K (x = 0) to 205 K (x = 0.02). On the other hand, the M(H) showed the presence of a linear graph for x = 0 and x = 0.02 which may be related to the presence of paramagnetic at room temperature.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"35 20","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601545","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1503
N. Vasanth, T. Dons, L. J. Michaelraj, P. Ganesan, S. H. Salmen, S. A. Alharbi, S. Mutheeswaran, M. Anthonysamy, S. Ignacimuthu, A. Stalin
The biogenic synthesis of silver nanoparticles mediated by medicinal plant Sterculia foetida was the prime experimental analysis of present study. The most important aim and focus of this study was to synthesis the AgNPs via biological method and the same had been evaluated against bio-film formation and dose dependent cyto-toxicity against cancer cells. This in vitro comprehensive analysis show that Ag had more advantage than other metals, the NPs was mediated by plant residue. And the NPs were further characterized by UV showing the sharp absorption peak at 455 nm; the identification of corresponding functional section proved by the parameter like FTIR, where conversion of Ag ions and capping agent is determined, the analysis on X- ray diffraction demonstrate the AgNPs found to be crystalline nature and face-centered like cubic structure. FESEM cum EDAX has showed the surface morphology with 40-50nm. After the physiochemical characterization, the AgNPs were evaluated with biofilm formation and cancer cells. In cyto-toxic study, two cell lines such as MCF 7 lung cancer cell line and A549 Breast cancer cell line were experimented and the values are AgNPs (IC50 =11.50± 0.05 µg and IC50 = 5.5± 0.05 µg/mL); AgNO3- (IC50 = 5.8± 0.05 µg and IC50 = 6.5± 0.05µg/mL) and Sterculia foetida (IC50 > 5000 µg/mL and IC50 < 5000 µg/mL). Another application of this present study is anti-biofilm assay. The selected bacterial strains are methicillinresistant Staphylococcus aureus; PA 14-Pseudomonas aeruginosa and Vibrio cholerae. Hence, the findings recommend that silver nanoparticles from medicinal plant Sterculia foetida is effective and can be used against bacteria and more precisely for cancer cell study.
{"title":"Effect of biofilm formation and cytotoxicity of biogenic silver nanoparticles (AgNPs) synthesized from a medicinal plant Sterculia foetida L.","authors":"N. Vasanth, T. Dons, L. J. Michaelraj, P. Ganesan, S. H. Salmen, S. A. Alharbi, S. Mutheeswaran, M. Anthonysamy, S. Ignacimuthu, A. Stalin","doi":"10.15251/djnb.2023.184.1503","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1503","url":null,"abstract":"The biogenic synthesis of silver nanoparticles mediated by medicinal plant Sterculia foetida was the prime experimental analysis of present study. The most important aim and focus of this study was to synthesis the AgNPs via biological method and the same had been evaluated against bio-film formation and dose dependent cyto-toxicity against cancer cells. This in vitro comprehensive analysis show that Ag had more advantage than other metals, the NPs was mediated by plant residue. And the NPs were further characterized by UV showing the sharp absorption peak at 455 nm; the identification of corresponding functional section proved by the parameter like FTIR, where conversion of Ag ions and capping agent is determined, the analysis on X- ray diffraction demonstrate the AgNPs found to be crystalline nature and face-centered like cubic structure. FESEM cum EDAX has showed the surface morphology with 40-50nm. After the physiochemical characterization, the AgNPs were evaluated with biofilm formation and cancer cells. In cyto-toxic study, two cell lines such as MCF 7 lung cancer cell line and A549 Breast cancer cell line were experimented and the values are AgNPs (IC50 =11.50± 0.05 µg and IC50 = 5.5± 0.05 µg/mL); AgNO3- (IC50 = 5.8± 0.05 µg and IC50 = 6.5± 0.05µg/mL) and Sterculia foetida (IC50 > 5000 µg/mL and IC50 < 5000 µg/mL). Another application of this present study is anti-biofilm assay. The selected bacterial strains are methicillinresistant Staphylococcus aureus; PA 14-Pseudomonas aeruginosa and Vibrio cholerae. Hence, the findings recommend that silver nanoparticles from medicinal plant Sterculia foetida is effective and can be used against bacteria and more precisely for cancer cell study.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"60 13","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138605109","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1451
D. Sudha, K. Uthayarani, N. Neelakandeswari, K. Jeyadheepan, M. Chitra
In the present work, MoO3 - MoO2 nanocomposite is synthesised via hydrothermal method and is characterised using various state-of-the-art techniques. The high crystallinity of the sample is observed from XRD and FESEM reveals the 2D plate like layered structures with hexagonal facets. The prepared composite is subjected to ethanol sensing at room temperature and it is observed that the material exhibits 4.5% for 25 ppm ethanol with response time as 98 s and recovery time as 219 s. The observed small response of the composite material MoO3 – MoO2 with longer response-recovery time might be due to the large sized fibrils observed.
{"title":"Synthesis, characterisation and ethanol sensing applications of MoO3 – MoO2 nanostructures at room temperature","authors":"D. Sudha, K. Uthayarani, N. Neelakandeswari, K. Jeyadheepan, M. Chitra","doi":"10.15251/djnb.2023.184.1451","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1451","url":null,"abstract":"In the present work, MoO3 - MoO2 nanocomposite is synthesised via hydrothermal method and is characterised using various state-of-the-art techniques. The high crystallinity of the sample is observed from XRD and FESEM reveals the 2D plate like layered structures with hexagonal facets. The prepared composite is subjected to ethanol sensing at room temperature and it is observed that the material exhibits 4.5% for 25 ppm ethanol with response time as 98 s and recovery time as 219 s. The observed small response of the composite material MoO3 – MoO2 with longer response-recovery time might be due to the large sized fibrils observed.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"80 19","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604553","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1351
P. Velarde, S. França, E. Brocchi, R. Souza
Dewatering unit operations are essential steps in mineral processing routes to obtain materials with high levels of solid content (60-70 wt.%). Polymers have been used for coagulation and flocculation in wastewater treatment for many years, and its application is mostly based on the ad- sorption mechanisms. In the case of fine nickel ore tailings, wastewaters typically contain large amounts of particles within microscale (d50 = 9.5 μm). The use of flocculant polymers, mostly poly- 18 acrylamides, acts to remove colloids from these effluents. Environmentally friendly natural poly- 19 mers, such as chitosan and humic acid, when used combined can be a highly effective reagent for 20 the treatment of these tailings. Therefore, the purpose of this study is to evaluate the use of these 21 natural polymers in the treatment of wastewater containing colloidal material to adequate the fine 22 particles content to less than 50 NTU, satisfying environmental standards. Particle removal effi- 23 ciency was calculated based on turbidity on wastewater as well as on thickener overflow. For fine 24 nickel tailings containing 2.15% (wt./vl.), a mixture of chitosan/humic acid of 24.9/6.3 g/t at pH=6.7 25 achieved a sedimentation of 95 wt.%. The turbidity was reduced to 40 NTU, motivating the use of 26 this technique to adequate wastewater to water reuse.
{"title":"Combined use of natural polymers (chitosan and humic acid) for treatment of Ni tailings containing fine particulate material","authors":"P. Velarde, S. França, E. Brocchi, R. Souza","doi":"10.15251/djnb.2023.184.1351","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1351","url":null,"abstract":"Dewatering unit operations are essential steps in mineral processing routes to obtain materials with high levels of solid content (60-70 wt.%). Polymers have been used for coagulation and flocculation in wastewater treatment for many years, and its application is mostly based on the ad- sorption mechanisms. In the case of fine nickel ore tailings, wastewaters typically contain large amounts of particles within microscale (d50 = 9.5 μm). The use of flocculant polymers, mostly poly- 18 acrylamides, acts to remove colloids from these effluents. Environmentally friendly natural poly- 19 mers, such as chitosan and humic acid, when used combined can be a highly effective reagent for 20 the treatment of these tailings. Therefore, the purpose of this study is to evaluate the use of these 21 natural polymers in the treatment of wastewater containing colloidal material to adequate the fine 22 particles content to less than 50 NTU, satisfying environmental standards. Particle removal effi- 23 ciency was calculated based on turbidity on wastewater as well as on thickener overflow. For fine 24 nickel tailings containing 2.15% (wt./vl.), a mixture of chitosan/humic acid of 24.9/6.3 g/t at pH=6.7 25 achieved a sedimentation of 95 wt.%. The turbidity was reduced to 40 NTU, motivating the use of 26 this technique to adequate wastewater to water reuse.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"77 13","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604499","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1363
S. Guluzade, N. Musayeva
The construction of a simple sensor structure sensitive to sulfur dioxide (SO2) based on multi-walled carbon nanotubes (MWCNTs) functionalized by nitric acid is described in this study. The functionalized MWCNTs were comparatively analyzed by X-ray diffraction, Raman, and FTIR spectroscopy methods, and their morphology was observed by scanning electron microscope (SEM). The sensitivity to 5 ppm SO2 gas is based on the change of resistance of functionalized MWCNTs. Tests on the fabricated sensor were performed at room temperature and defined that functionalized MWCNTs are sensitive to SO2 gas compared with the pristine MWCNTs.
{"title":"Room temperature detection of sulfur dioxide using functionalized carbon nanotubes","authors":"S. Guluzade, N. Musayeva","doi":"10.15251/djnb.2023.184.1363","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1363","url":null,"abstract":"The construction of a simple sensor structure sensitive to sulfur dioxide (SO2) based on multi-walled carbon nanotubes (MWCNTs) functionalized by nitric acid is described in this study. The functionalized MWCNTs were comparatively analyzed by X-ray diffraction, Raman, and FTIR spectroscopy methods, and their morphology was observed by scanning electron microscope (SEM). The sensitivity to 5 ppm SO2 gas is based on the change of resistance of functionalized MWCNTs. Tests on the fabricated sensor were performed at room temperature and defined that functionalized MWCNTs are sensitive to SO2 gas compared with the pristine MWCNTs.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 10","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601964","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1395
H. Li, Z. P. Hou, X. H. Zhang
The MoO3/GO composites were synthesized via a hydrothermal method. The performance of these composites as lubricating oil additives was investigated by a multifunctional friction testing machine. And the lubrication mechanism of MoO3/GO in base oil was discussed based on SEM and EDS test data. The results demonstrate that MoO3/GO composites as additives exhibit excellent anti-friction and anti-wear properties. This is mainly due to the synergistic effect between the lubricating film formed by the composite material on the wear surface and the self-healing ability of nano-MoO3, which can effectively fill and repair wear scars while reducing friction and wear on the steel disc surface.
{"title":"Preparation and tribological properties of GO supported MoO3 composite nanomaterials","authors":"H. Li, Z. P. Hou, X. H. Zhang","doi":"10.15251/djnb.2023.184.1395","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1395","url":null,"abstract":"The MoO3/GO composites were synthesized via a hydrothermal method. The performance of these composites as lubricating oil additives was investigated by a multifunctional friction testing machine. And the lubrication mechanism of MoO3/GO in base oil was discussed based on SEM and EDS test data. The results demonstrate that MoO3/GO composites as additives exhibit excellent anti-friction and anti-wear properties. This is mainly due to the synergistic effect between the lubricating film formed by the composite material on the wear surface and the self-healing ability of nano-MoO3, which can effectively fill and repair wear scars while reducing friction and wear on the steel disc surface.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"13 9","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604058","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1339
M. Y. Yadgari, S. Subat, S. Rashid, S. Ullah, L. Li, M. A. Hassani, H. Emiliya, G. Rukh
Recently, the rapid increase in population and industrialization has been created a lot of problems to water resources around the world. Most of the world population are exposed directly or indirectly towards heavy metals (HMs) such as Arsenic (As) contamination and thus making the water resources unfit for drinking and other human purposes. The current study was planned to find the As adsorption potential of novel thiolated cobalt-doped silver nanoparticles (Co-Ag NPs) under various environmental setups. In present work the Co-Ag NPs of sizes (20–22 nm) were synthesized through co-precipitation process. Adsorption of As with Co-Ag NPs was tested in batch experiments with respect light, pH and competing anions. Overall, the Co-Ag NPs effectively adsorbed the As in presence of sunlight (100%) and neutral pH (>99%). The removal of As was maximum (>99%) at CoAg NPs:As ratio of < 0.5:1. Similarly, the synthesized Co-Ag NPs did not showed the goodadsorption efficiency in dark condition about (21.4%) and only (11.1%) uptake at low and high pH respectively. Results of the current study showed that Co-Ag NPs can efficiently adsorb the As and reduce to non-toxic form i.e. below the WHO standard limit (10 µg/L)in drinking water.
{"title":"Toxic effects of arsenic and its adsorption through thiolated cobalt doped silver nanomaterials from water resources","authors":"M. Y. Yadgari, S. Subat, S. Rashid, S. Ullah, L. Li, M. A. Hassani, H. Emiliya, G. Rukh","doi":"10.15251/djnb.2023.184.1339","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1339","url":null,"abstract":"Recently, the rapid increase in population and industrialization has been created a lot of problems to water resources around the world. Most of the world population are exposed directly or indirectly towards heavy metals (HMs) such as Arsenic (As) contamination and thus making the water resources unfit for drinking and other human purposes. The current study was planned to find the As adsorption potential of novel thiolated cobalt-doped silver nanoparticles (Co-Ag NPs) under various environmental setups. In present work the Co-Ag NPs of sizes (20–22 nm) were synthesized through co-precipitation process. Adsorption of As with Co-Ag NPs was tested in batch experiments with respect light, pH and competing anions. Overall, the Co-Ag NPs effectively adsorbed the As in presence of sunlight (100%) and neutral pH (>99%). The removal of As was maximum (>99%) at CoAg NPs:As ratio of < 0.5:1. Similarly, the synthesized Co-Ag NPs did not showed the goodadsorption efficiency in dark condition about (21.4%) and only (11.1%) uptake at low and high pH respectively. Results of the current study showed that Co-Ag NPs can efficiently adsorb the As and reduce to non-toxic form i.e. below the WHO standard limit (10 µg/L)in drinking water.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"66 26","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138605059","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1409
S. Bouali, K. Bounab, H. Menasra, Z. Necira, M. Abba
In this study, perovskite ceramics (Na0.5 Bi0.5)1-xBax[(Ti0.8 Zr0.2)0.9(Nb2/3 Zn1/3)0.1]O3 (NB1- xBxTZNZ) were prepared using the molten salt method. The sintering process was conducted at 1100°C for 4 hours in an air atmosphere. The crystal structure was examined using X-ray powder diffraction, which indicated that the material crystallized in a tetragonal structure with a space groupe P4bm. However, there was also evidence of 6% pyrochlore phase present. The crystallite size was found to decrease with Barium doping, and this decrease was attributed to the pinning effect of grain boundaries resulting from the formation of oxygen vacancies which reduce the AC conductivity values. Scanning electron microscopy was employed to examine the grain morphologies, revealing that the sample exhibited a compact structure. Additionally, the density of (NB1-xBxTZNZ) (x=0.04) was observed to be higher compared to (NB1-xBxTZNZ) (x=0.00). Barium doped into NB1-xBxTZNZ also caused a decrease in dielectric constant and dielectric loss. Raman spectroscopy was performed at room temperature on the doped ceramic with Barium, and we discussed the incorporation of Ba2+ in A-site of the perovskite ABO3.
{"title":"The effects of 4% barium doping on the morphological, strutural and dielectric characteristics of (Na0.5 Bi0.5)[(Ti0.8 Zr0.2)0.9(Nb2/3 Zn1/3)0.1]O3","authors":"S. Bouali, K. Bounab, H. Menasra, Z. Necira, M. Abba","doi":"10.15251/djnb.2023.184.1409","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1409","url":null,"abstract":"In this study, perovskite ceramics (Na0.5 Bi0.5)1-xBax[(Ti0.8 Zr0.2)0.9(Nb2/3 Zn1/3)0.1]O3 (NB1- xBxTZNZ) were prepared using the molten salt method. The sintering process was conducted at 1100°C for 4 hours in an air atmosphere. The crystal structure was examined using X-ray powder diffraction, which indicated that the material crystallized in a tetragonal structure with a space groupe P4bm. However, there was also evidence of 6% pyrochlore phase present. The crystallite size was found to decrease with Barium doping, and this decrease was attributed to the pinning effect of grain boundaries resulting from the formation of oxygen vacancies which reduce the AC conductivity values. Scanning electron microscopy was employed to examine the grain morphologies, revealing that the sample exhibited a compact structure. Additionally, the density of (NB1-xBxTZNZ) (x=0.04) was observed to be higher compared to (NB1-xBxTZNZ) (x=0.00). Barium doped into NB1-xBxTZNZ also caused a decrease in dielectric constant and dielectric loss. Raman spectroscopy was performed at room temperature on the doped ceramic with Barium, and we discussed the incorporation of Ba2+ in A-site of the perovskite ABO3.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"22 6","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603803","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 : 2023-12-04DOI: 10.15251/djnb.2023.184.1371
M. Zerouali, R. Daïra, B. Boudjema, R. Barille, D. Bouras, S. Iaiche
In this work, copper oxide thin films were deposited by pneumatic spray pyrolysis method on a microscopy glass substrate, heated at 400°C for different deposition times (5min, 10min, 15min, 20min,25min, and 30min) using a 0.1M of precursor concentration. These films are characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), spectroscopic ellipsometry, UV-visible spectroscopy, four points method, and water contact angle. According to the XRD, all peaks confirm the formation of the phase tenorite of the monoclinic structure. The deposited were polycrystalline copper oxide CuO with directions along (111) plane, the crystallites size between 14 and 23 nm. FTIR spectroscopy confirms the presence of the CuO phase and agrees that it will result in XRD. From the transmission spectra, the average transmission between 400 and 800nm is 65% to 50%, and the gap energy is 2.65 eV to 1.09 eV. The water contact angle values in all samples are greater than 90° and range from 96.4° to 103.2°, as we can see from these results that all the samples are hydrophobic films.
{"title":"Effect thickness of copper oxide thin films on structural, optical, electrical, and hydrophobic properties for use in self-cleaning technique","authors":"M. Zerouali, R. Daïra, B. Boudjema, R. Barille, D. Bouras, S. Iaiche","doi":"10.15251/djnb.2023.184.1371","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1371","url":null,"abstract":"In this work, copper oxide thin films were deposited by pneumatic spray pyrolysis method on a microscopy glass substrate, heated at 400°C for different deposition times (5min, 10min, 15min, 20min,25min, and 30min) using a 0.1M of precursor concentration. These films are characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), spectroscopic ellipsometry, UV-visible spectroscopy, four points method, and water contact angle. According to the XRD, all peaks confirm the formation of the phase tenorite of the monoclinic structure. The deposited were polycrystalline copper oxide CuO with directions along (111) plane, the crystallites size between 14 and 23 nm. FTIR spectroscopy confirms the presence of the CuO phase and agrees that it will result in XRD. From the transmission spectra, the average transmission between 400 and 800nm is 65% to 50%, and the gap energy is 2.65 eV to 1.09 eV. The water contact angle values in all samples are greater than 90° and range from 96.4° to 103.2°, as we can see from these results that all the samples are hydrophobic films.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"69 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138605040","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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