Pub Date : 2024-08-27DOI: 10.1088/2043-6262/ad6e5b
Tran Minh Thi, Nguyen Mau Lam, Do Khanh Tung, Nguyen Manh Nghia, Duong Quoc Van, Vu Quoc Manh, Nguyen Thi Bich Viet, Duong Khanh Linh, Nguyen Thuy Chinh, Thai Hoang, Ştefan Ţălu, Vu Quoc Trung
The polyaniline/Fe2.9Zn0.1O4 (PANI/Fe2.9Zn0.1O4) nanoparticles with different mass ratios were synthesized by both co-precipitation and in situ polymerization methods. The FT-IR spectra and DTA analyses showed the involvement of PANI in the nanocomposite samples. The grain size of samples measured by SEM ranges from 25 to 40 nm. The magnetization of samples at 300 K, H = 11000 Oe decreased from 65 to 43 emu g−1 as PANI/Fe2.9Zn0.1O4 mass ratio increased from 9% to 40%. At pH 7 and 300 K, the maximum arsenic (III) adsorption capacities of sample S1 (mass ratio of 9%) qmax = 43.48 mg g−1 was higher than that of others and Fe3O4. Additionally, the substitution of Fe2+ ions by Zn2+ ions and the presence of PANI in samples contributed to improving the magnetic and chemical stability of samples over time. Furthermore, these materials could be reused after desorption in a solution at pH 14.
{"title":"Study on the nanocomposites of polyaniline and Zn doped Fe3O4 using for arsenic absorption in water","authors":"Tran Minh Thi, Nguyen Mau Lam, Do Khanh Tung, Nguyen Manh Nghia, Duong Quoc Van, Vu Quoc Manh, Nguyen Thi Bich Viet, Duong Khanh Linh, Nguyen Thuy Chinh, Thai Hoang, Ştefan Ţălu, Vu Quoc Trung","doi":"10.1088/2043-6262/ad6e5b","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6e5b","url":null,"abstract":"The polyaniline/Fe<sub>2.9</sub>Zn<sub>0.1</sub>O<sub>4</sub> (PANI/Fe<sub>2.9</sub>Zn<sub>0.1</sub>O<sub>4</sub>) nanoparticles with different mass ratios were synthesized by both co-precipitation and <italic toggle=\"yes\">in situ</italic> polymerization methods. The FT-IR spectra and DTA analyses showed the involvement of PANI in the nanocomposite samples. The grain size of samples measured by SEM ranges from 25 to 40 nm. The magnetization of samples at 300 K, H = 11000 Oe decreased from 65 to 43 emu g<sup>−1</sup> as PANI/Fe<sub>2.9</sub>Zn<sub>0.1</sub>O<sub>4</sub> mass ratio increased from 9% to 40%. At pH 7 and 300 K, the maximum arsenic (III) adsorption capacities of sample S<sub>1</sub> (mass ratio of 9%) q<sub>max</sub> = 43.48 mg g<sup>−1</sup> was higher than that of others and Fe<sub>3</sub>O<sub>4</sub>. Additionally, the substitution of Fe<sup>2+</sup> ions by Zn<sup>2+</sup> ions and the presence of PANI in samples contributed to improving the magnetic and chemical stability of samples over time. Furthermore, these materials could be reused after desorption in a solution at pH 14.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"409 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zinc is an important micronutrient for plants, involved in numerous physiological processes as well as numerous enzymatic and metabolic events. Zinc deficiency results in slowed plant development, higher chlorosis rates, smaller leaves, and fewer tillers, which lengthen the crop maturity period and lowers crop quality. In the present study, zinc oxide nanoparticles (ZnONPs) were synthesized through co-precipitation approach by using Lantana camara plant leaf extract. The synthesized ZnONPs were hexagonal in shape with mean size of around 60 nm. The bactericidal activity of ZnONPs was assessed against three phytopathogenic bacterial strains namely Ralstonia solanacearum, Xanthomonas campestris and Erwinia carotovora through broth dilution method. The MIC50 of ZnONPs was 248.33 μg ml−1, 320 .27 μg ml−1 and 320.95 μg ml−1 against R. solanacearum, X. campestris and E. carotovora respectively. The fungiciadal activity of ZnONPs against three phytopathogenic fungal strains was studied by poison food technique. It was observed that 500 ppm ZnONPs could inhbit 86%, 85% and 55% growth of Alterneria solani, Fusarium oxysporum and Athelia rolfsii respectively. The efficacy of ZnONPs as nano fertilizer was evaluated in Solanum lycopersicum Linn. by foliar spray under laboratory condition and it was observed that in comparison with micron sized ZnO, ZnONP treatment could significantly boost up fresh and dry weight, root and shoot length, chlorophyll, lipid and carbohydrate content of the plants.
{"title":"Green synthesis of ZnO nanoparticles using Lantana camara leaf extract for the enhancement of plant growth","authors":"Pushpendra Pratap Singh, Sarika Chaturvedi, Tripti Bhatnagar, Sumistha Das, Nitai Debnath","doi":"10.1088/2043-6262/ad6cc0","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cc0","url":null,"abstract":"Zinc is an important micronutrient for plants, involved in numerous physiological processes as well as numerous enzymatic and metabolic events. Zinc deficiency results in slowed plant development, higher chlorosis rates, smaller leaves, and fewer tillers, which lengthen the crop maturity period and lowers crop quality. In the present study, zinc oxide nanoparticles (ZnONPs) were synthesized through co-precipitation approach by using <italic toggle=\"yes\">Lantana camara</italic> plant leaf extract. The synthesized ZnONPs were hexagonal in shape with mean size of around 60 nm. The bactericidal activity of ZnONPs was assessed against three phytopathogenic bacterial strains namely <italic toggle=\"yes\">Ralstonia solanacearum</italic>, <italic toggle=\"yes\">Xanthomonas campestris</italic> and <italic toggle=\"yes\">Erwinia carotovora</italic> through broth dilution method. The MIC50 of ZnONPs was 248.33 <italic toggle=\"yes\">μ</italic>g ml<sup>−1</sup>, 320 .27 <italic toggle=\"yes\">μ</italic>g ml<sup>−1</sup> and 320.95 <italic toggle=\"yes\">μ</italic>g ml<sup>−1</sup> against <italic toggle=\"yes\">R. solanacearum</italic>, <italic toggle=\"yes\">X. campestris</italic> and <italic toggle=\"yes\">E. carotovora</italic> respectively. The fungiciadal activity of ZnONPs against three phytopathogenic fungal strains was studied by poison food technique. It was observed that 500 ppm ZnONPs could inhbit 86%, 85% and 55% growth of <italic toggle=\"yes\">Alterneria solani, Fusarium oxysporum</italic> and <italic toggle=\"yes\">Athelia rolfsii</italic> respectively. The efficacy of ZnONPs as nano fertilizer was evaluated in <italic toggle=\"yes\">Solanum lycopersicum</italic> Linn. by foliar spray under laboratory condition and it was observed that in comparison with micron sized ZnO, ZnONP treatment could significantly boost up fresh and dry weight, root and shoot length, chlorophyll, lipid and carbohydrate content of the plants.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"24 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Improving the apparent solubility of poorly soluble therapeutic molecules with poor absorption into the circulatory system is a significant research question in drug discovery. This enhancement is achieved by delivering drugs through nano-carriers that provide apparent solubility with its surfactant. The effectiveness of a nano-carrier is relied majorly on its loading efficiency which is determined by the extent of interaction between the drug and the surfactants of the carriers. The loading effectiveness can be reckoned with a better understanding of the drug-surfactant conjugation mechanism. Hence this review comprehends the different nano-carriers, their appropriate surfactant systems, and the loading mechanism of drugs with surfactants through different bonds. Further, the current status and prospects of the nano-carriers are briefly summarized at last to expound on the significance of these nano-carriers in drug delivery.
{"title":"Importance of nano-carriers, surfactant system, and their loading mechanism to improve the absorption and bio-availability of drugs: a review","authors":"Nazeer Abdul Azeez, Krishnaswami Venkateshwaran, Ruckmani Kandasamy, Muthupandian Saravanan, Vijaykumar Sudarshana Deepa","doi":"10.1088/2043-6262/ad6cbf","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cbf","url":null,"abstract":"Improving the apparent solubility of poorly soluble therapeutic molecules with poor absorption into the circulatory system is a significant research question in drug discovery. This enhancement is achieved by delivering drugs through nano-carriers that provide apparent solubility with its surfactant. The effectiveness of a nano-carrier is relied majorly on its loading efficiency which is determined by the extent of interaction between the drug and the surfactants of the carriers. The loading effectiveness can be reckoned with a better understanding of the drug-surfactant conjugation mechanism. Hence this review comprehends the different nano-carriers, their appropriate surfactant systems, and the loading mechanism of drugs with surfactants through different bonds. Further, the current status and prospects of the nano-carriers are briefly summarized at last to expound on the significance of these nano-carriers in drug delivery.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"177 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The global challenge of achieving sustainable agricultural productivity and ensuring food security is exacerbated by the threat of phytopathogens and pests, which cause substantial damage and result in annual production losses of approximately 20%–40%, amounting to around 40 billion US dollars worldwide. Current reliance on conventional pesticides for crop disease management not only poses risks to human, animal, and environmental health but also contributes to the development of resistant pathogens. In response to this pressing issue, innovative technologies utilizing nanomaterials offer a promising alternative. These nanomaterials including lipid based nanoparticles (LNPs) can encapsulate and deliver pesticidal active ingredients in a controlled and targeted manner, presenting opportunities to enhance efficacy and efficiency while minimizing environmental impact. This approach represents a crucial step towards sustainable agriculture, preserving agro-ecosystem resilience and ensuring global food security. This review aims to provide an overview of the current state of knowledge regarding the use of LNPs in agriculture, with a focus on their applications for crop disease management.
{"title":"Lipid nanoparticles: a sustainable solution for crop disease management","authors":"Abhishek Pathak, Neetesh Mandal, Devanshi Chandel Upadhyaya, Neha Joshi, Chandrama Prakash Upadhyaya","doi":"10.1088/2043-6262/ad6cbe","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cbe","url":null,"abstract":"The global challenge of achieving sustainable agricultural productivity and ensuring food security is exacerbated by the threat of phytopathogens and pests, which cause substantial damage and result in annual production losses of approximately 20%–40%, amounting to around 40 billion US dollars worldwide. Current reliance on conventional pesticides for crop disease management not only poses risks to human, animal, and environmental health but also contributes to the development of resistant pathogens. In response to this pressing issue, innovative technologies utilizing nanomaterials offer a promising alternative. These nanomaterials including lipid based nanoparticles (LNPs) can encapsulate and deliver pesticidal active ingredients in a controlled and targeted manner, presenting opportunities to enhance efficacy and efficiency while minimizing environmental impact. This approach represents a crucial step towards sustainable agriculture, preserving agro-ecosystem resilience and ensuring global food security. This review aims to provide an overview of the current state of knowledge regarding the use of LNPs in agriculture, with a focus on their applications for crop disease management.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"5 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-22DOI: 10.1088/2043-6262/ad6cc3
Koushi Kumar, Nirmala Nithya Raju, Abdul Azeez Nazeer
This study focuses on the development of mesoporous zinc oxide nanoparticles (mZNPs) via the sol–gel technique, utilizing polyethylene glycol-6000 (PEG-6000) as a capping agent. The research aims to investigate the suitability of these nanoparticles for drug delivery purposes. The analysis of the synthesized material validates the existence of a hexagonal system of zinc oxide with space group P63cm and HRTM confirmed the crystallinity and morphology of the nanoparticles ranging from 15–20 nm, revealing the formation of pores attributed to the presence of PEG-6000. The mZNPs exhibit a BET surface area of 28.3 m2. g−1, with Langmuir surface area measurements indicating 46 m2. g−1. Analysis employing the BJH method outlines pore diameters ranging from approximately 2–5 nm at a relative pressure of around 0.99. Furthermore, these mZNPs demonstrated drug delivery attributes, with 43.3% loading efficiency and 80.33% entrapment efficiency for aspirin. Notably, the release kinetics of aspirin from the mZNPs were investigated in simulated fluids of varying pH, with the highest release (98.1%) observed in simulated intestinal fluid (pH 6.8). The formulation exhibits typical time-dependent release kinetics under mild pH conditions (7.4 and 6.8), while transitioning to erosion-controlled diffusion mechanisms in acidic pH conditions (1.2). Furthermore, mathematical models, including Higuchi’s, Korsmeyer’s, and Weibull’s, were employed to assess release kinetics, offering parameters for in-vitro to in-vivo pharmacokinetic predictions. In the framework of PBPK modeling, renal clearance was computationally simulated at a rate of 45 min−1, whereas biliary clearance was modeled to occur at 0.05 min−1. Utilizing these model-derived parameters, the projected half-life of aspirin administered via mZNPs was determined to be 3.1 h. The potential applications of these findings extend to the development of effective drug delivery systems, warranting consideration for future animal model studies involving aspirin and mZNPs.
{"title":"Facile synthesis of mesoporous zinc oxide nanoparticle as a drug delivery system evaluated by IVIVE in PBPK modeling","authors":"Koushi Kumar, Nirmala Nithya Raju, Abdul Azeez Nazeer","doi":"10.1088/2043-6262/ad6cc3","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cc3","url":null,"abstract":"This study focuses on the development of mesoporous zinc oxide nanoparticles (mZNPs) via the sol–gel technique, utilizing polyethylene glycol-6000 (PEG-6000) as a capping agent. The research aims to investigate the suitability of these nanoparticles for drug delivery purposes. The analysis of the synthesized material validates the existence of a hexagonal system of zinc oxide with space group <italic toggle=\"yes\">P6</italic>\u0000<sub>3</sub>cm and HRTM confirmed the crystallinity and morphology of the nanoparticles ranging from 15–20 nm, revealing the formation of pores attributed to the presence of PEG-6000. The mZNPs exhibit a BET surface area of 28.3 m<sup>2</sup>. g<sup>−1</sup>, with Langmuir surface area measurements indicating 46 m<sup>2</sup>. g<sup>−1</sup>. Analysis employing the BJH method outlines pore diameters ranging from approximately 2–5 nm at a relative pressure of around 0.99. Furthermore, these mZNPs demonstrated drug delivery attributes, with 43.3% loading efficiency and 80.33% entrapment efficiency for aspirin. Notably, the release kinetics of aspirin from the mZNPs were investigated in simulated fluids of varying pH, with the highest release (98.1%) observed in simulated intestinal fluid (pH 6.8). The formulation exhibits typical time-dependent release kinetics under mild pH conditions (7.4 and 6.8), while transitioning to erosion-controlled diffusion mechanisms in acidic pH conditions (1.2). Furthermore, mathematical models, including Higuchi’s, Korsmeyer’s, and Weibull’s, were employed to assess release kinetics, offering parameters for <italic toggle=\"yes\">in-vitro</italic> to <italic toggle=\"yes\">in-vivo</italic> pharmacokinetic predictions. In the framework of PBPK modeling, renal clearance was computationally simulated at a rate of 45 min<sup>−1</sup>, whereas biliary clearance was modeled to occur at 0.05 min<sup>−1</sup>. Utilizing these model-derived parameters, the projected half-life of aspirin administered via mZNPs was determined to be 3.1 h. The potential applications of these findings extend to the development of effective drug delivery systems, warranting consideration for future animal model studies involving aspirin and mZNPs.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"64 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-22DOI: 10.1088/2043-6262/ad6cc5
T Y S Panca Putra, Nadhifah Salsabila, Sudaryanto1suda014@brin.go.id
High voltage cathode spinel material of LiNi0.5Mn1.5O4 was doped by yttrium (Y) element in the form of LiNi0.5Mn1.5−xYxO4 (x = 0, 0.05, 0.1) for Li-ion batteries. Structure and properties analysis was conducted to study the effect of Y addition on the crystal structure and the electrochemical performances of LiNi0.5Mn1.5−xYxO4. The results show that undoped LiNi0.5-Mn1.5O4 (x = 0) fit to cubic spinel structure with space group Fd-3m with some LixNi1-xO detected as impurities. The addition of Y with x = 0.05 and 0.1 resulted in the change of LiNi0.5Mn1.5−xYxO4 structure to space group P4332. The Y addition was confirmed to enter 4b site co-existed with Mn and this result is closely related to the increase in lattice parameters a from 8.1384(1) Å to 8.1496(5) Å and 8.1627(1) for x = 0, 0.05 and 0.1, respectively. The cubic unit volume of LiNi0.5Mn1.5−xYxO4 also increased with increasing Y addition. The addition of Y is liable to the formation of more stable [Mn,Y]O6 and MnO6 octahedra and whole crystal structure. The result from charge/discharge analysis shows that the addition of Y resulted in decreasing discharge capacity from 123.56 mAh g−1 to 105.175 mAh g−1 and 104.369 for x = 0.05 and 0.1, respectively. However, capacity retention after the 25th cycle increased constantly from 77% to 88% and 92% with increasing Y addition. Doped Y, in general, improves the electrochemical performance of LiNi0.5Mn1.5−xYxO4 as cathode material for LIBs.
掺入钇元素的 LiNi0.5Mn1.5O4 高压正极尖晶石材料以 LiNi0.5Mn1.5-xYxO4 (x = 0, 0.05, 0.1) 的形式用于锂离子电池。通过结构和性质分析，研究了添加 Y 元素对 LiNi0.5Mn1.5-xYxO4 晶体结构和电化学性能的影响。结果表明，未掺杂的 LiNi0.5-Mn1.5O4（x = 0）符合空间群为 Fd-3m 的立方尖晶石结构，其中检测到一些 LixNi1-xO 作为杂质。添加 Y（x = 0.05 和 0.1）后，LiNi0.5Mn1.5-xYxO4 结构变为空间群 P4332。这一结果与 x = 0、0.05 和 0.1 时晶格参数 a 分别从 8.1384(1)埃增至 8.1496(5)埃和 8.1627(1)密切相关。LiNi0.5Mn1.5-xYxO4 的立方体单位体积也随着 Y 添加量的增加而增大。Y 的加入有利于形成更稳定的 [Mn,Y]O6 和 MnO6 八面体和整个晶体结构。充放电分析结果表明，在 x = 0.05 和 0.1 时，添加 Y 会导致放电容量从 123.56 mAh g-1 下降到 105.175 mAh g-1 和 104.369。然而，随着 Y 添加量的增加，第 25 个循环后的容量保持率从 77% 持续上升到 88% 和 92%。总的来说，掺杂 Y 能改善作为 LIB 阴极材料的 LiNi0.5Mn1.5xYxO4 的电化学性能。
{"title":"Structure and properties analysis of yttrium doped high-voltage LiNi0.5Mn1.5O4 cathode materials for Li-ion batteries","authors":"T Y S Panca Putra, Nadhifah Salsabila, Sudaryanto1suda014@brin.go.id","doi":"10.1088/2043-6262/ad6cc5","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cc5","url":null,"abstract":"High voltage cathode spinel material of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> was doped by yttrium (Y) element in the form of LiNi<sub>0.5</sub>Mn<sub>1.5−<italic toggle=\"yes\">x</italic>\u0000</sub>Y<sub>\u0000<italic toggle=\"yes\">x</italic>\u0000</sub>O<sub>4</sub> (x = 0, 0.05, 0.1) for Li-ion batteries. Structure and properties analysis was conducted to study the effect of Y addition on the crystal structure and the electrochemical performances of LiNi<sub>0.5</sub>Mn<sub>1.5−<italic toggle=\"yes\">x</italic>\u0000</sub>Y<sub>\u0000<italic toggle=\"yes\">x</italic>\u0000</sub>O<sub>4</sub>. The results show that undoped LiNi<sub>0.5-</sub>Mn<sub>1.5</sub>O<sub>4</sub> (x = 0) fit to cubic spinel structure with space group <italic toggle=\"yes\">Fd-</italic>3<italic toggle=\"yes\">m</italic> with some Li<sub>x</sub>Ni<sub>1-x</sub>O detected as impurities. The addition of Y with x = 0.05 and 0.1 resulted in the change of LiNi<sub>0.5</sub>Mn<sub>1.5−<italic toggle=\"yes\">x</italic>\u0000</sub>Y<sub>\u0000<italic toggle=\"yes\">x</italic>\u0000</sub>O<sub>4</sub> structure to space group <italic toggle=\"yes\">P4</italic>\u0000<sub>3</sub>32. The Y addition was confirmed to enter 4<italic toggle=\"yes\">b</italic> site co-existed with Mn and this result is closely related to the increase in lattice parameters <italic toggle=\"yes\">a</italic> from 8.1384(1) Å to 8.1496(5) Å and 8.1627(1) for x = 0, 0.05 and 0.1, respectively. The cubic unit volume of LiNi<sub>0.5</sub>Mn<sub>1.5−<italic toggle=\"yes\">x</italic>\u0000</sub>Y<sub>\u0000<italic toggle=\"yes\">x</italic>\u0000</sub>O<sub>4</sub> also increased with increasing Y addition. The addition of Y is liable to the formation of more stable [Mn,Y]O<sub>6</sub> and MnO<sub>6</sub> octahedra and whole crystal structure. The result from charge/discharge analysis shows that the addition of Y resulted in decreasing discharge capacity from 123.56 mAh g<sup>−1</sup> to 105.175 mAh g<sup>−1</sup> and 104.369 for x = 0.05 and 0.1, respectively. However, capacity retention after the 25th cycle increased constantly from 77% to 88% and 92% with increasing Y addition. Doped Y, in general, improves the electrochemical performance of LiNi<sub>0.5</sub>Mn<sub>1.5−<italic toggle=\"yes\">x</italic>\u0000</sub>Y<sub>\u0000<italic toggle=\"yes\">x</italic>\u0000</sub>O<sub>4</sub> as cathode material for LIBs.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-22DOI: 10.1088/2043-6262/ad6cc4
Amit Kumar Gupta, Priyanshu Singh, Monical Jaiswal, Jagjiwan Mittal, Sivanandam Aravindan, Sumit Chaudhary, Satinder Kumar Sharma, Robin Kumar
In this work a potable, resistive sensor is fabricated for the selective detection of CO gas using nanorods of Ag doped octahedral molecular sieves-2 (Ag-OMS-2). During exposure to carbon monoxide (CO) gas at room temperature, resistance of Ag-OMS-2 film was dropped from 557 kΩ to 352 kΩ in just 18 sec. However, exposed sample regained its initial resistance value in 25 sec when CO gas source was removed. Both sensing and recovery processes were carried out at room temperature. The sensor film showed excellent reproducibility during several cycles of CO gas exposure. Swift activation of oxygen molecules for the oxidation of CO by the silver present in the tunnel of manganese oxide network is supposed to be responsible for sensing activity of Ag-OMS-2 towards carbon monoxide gas.
本研究利用掺银八面体分子筛-2（Ag-OMS-2）纳米棒制作了一种可饮用的电阻式传感器，用于选择性检测一氧化碳气体。在室温下暴露于一氧化碳（CO）气体时，Ag-OMS-2 薄膜的电阻在短短 18 秒内从 557 kΩ 下降到 352 kΩ。然而，当移除 CO 气体源时，暴露的样品在 25 秒内恢复了初始电阻值。传感和恢复过程均在室温下进行。在多次接触 CO 气体的过程中，传感器薄膜显示出极佳的再现性。氧化锰网络隧道中的银迅速激活氧分子氧化一氧化碳，这应该是 Ag-OMS-2 对一氧化碳气体具有传感活性的原因。
{"title":"Selective and reversible carbon mono oxide gas detection using silver doped octahedral molecular sieves (OMS-2) nanorods","authors":"Amit Kumar Gupta, Priyanshu Singh, Monical Jaiswal, Jagjiwan Mittal, Sivanandam Aravindan, Sumit Chaudhary, Satinder Kumar Sharma, Robin Kumar","doi":"10.1088/2043-6262/ad6cc4","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cc4","url":null,"abstract":"In this work a potable, resistive sensor is fabricated for the selective detection of CO gas using nanorods of Ag doped octahedral molecular sieves-2 (Ag-OMS-2). During exposure to carbon monoxide (CO) gas at room temperature, resistance of Ag-OMS-2 film was dropped from 557 kΩ to 352 kΩ in just 18 sec. However, exposed sample regained its initial resistance value in 25 sec when CO gas source was removed. Both sensing and recovery processes were carried out at room temperature. The sensor film showed excellent reproducibility during several cycles of CO gas exposure. Swift activation of oxygen molecules for the oxidation of CO by the silver present in the tunnel of manganese oxide network is supposed to be responsible for sensing activity of Ag-OMS-2 towards carbon monoxide gas.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"28 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-21DOI: 10.1088/2043-6262/ad6cc2
Dang Manh Le, Tuan Loi Nguyen, Minh Thu Nguyen, Van Man Tran, Hoai Phuong Pham, Hai Dang Ngo, Thuy Thi Thu Nguyen, Trung Hieu Bui
Free-standing anodes composed of porous carbon nanofibers (PCNFs) were fabricated by electrospinning for use in lithium-ion batteries. The use of terephthalic acid (PTA) as the sublimating agent, one-step carbonization at 900 °C for 2 h under vacuum converts the as-prepared samples to have interconnected pores along the PCNFs interior with numerous surface openings. The electrode was characterized using scanning electron microscopy (SEM), surface area analysis (BET), x-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and Raman spectra (Raman). This strategy makes the PCNFs with a specific surface area of up to 290 m2 g−1, which is significantly higher than the CNFs with 107 m2 g−1. As a result, electrochemical tests exhibited that the PCNFs have a high discharge capacity of 750 mAh g−1, which is sharply higher than that of the CNFs (234 mAh g−1) at 100 mA g−1. Even at a current density of 3000 mA g−1, the PCNFs still exhibit a very high discharge capacity of 621 mAh g−1. The present study may provide an effective strategy for synthesizing low-cost, binder-free, and environmentally friendly anodes for lithium-ion batteries with outstanding properties.
利用电纺丝技术制造了由多孔碳纳米纤维（PCNFs）组成的独立阳极，可用于锂离子电池。使用对苯二甲酸（PTA）作为升华剂，在真空条件下于 900 °C 一步碳化 2 小时后，制备的样品沿 PCNFs 内部形成了相互连接的孔隙，并具有大量的表面开口。使用扫描电子显微镜 (SEM)、表面积分析 (BET)、X 射线衍射 (XRD)、透射电子显微镜 (TEM)、傅立叶变换红外光谱 (FTIR) 和拉曼光谱 (Raman) 对电极进行了表征。这种策略使 PCNFs 的比表面积高达 290 m2 g-1，明显高于 107 m2 g-1 的 CNFs。因此，电化学测试表明，PCNFs 在 100 mA g-1 时的放电容量高达 750 mAh g-1，大大高于 CNFs（234 mAh g-1）。即使在电流密度为 3000 mA g-1 时，PCNFs 仍表现出 621 mAh g-1 的极高放电容量。本研究为合成低成本、无粘结剂、环保且性能优异的锂离子电池阳极提供了一种有效的策略。
{"title":"Fabrication of porous carbon nanofibers by electrospinning as free-standing anodes for lithium-ion batteries","authors":"Dang Manh Le, Tuan Loi Nguyen, Minh Thu Nguyen, Van Man Tran, Hoai Phuong Pham, Hai Dang Ngo, Thuy Thi Thu Nguyen, Trung Hieu Bui","doi":"10.1088/2043-6262/ad6cc2","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6cc2","url":null,"abstract":"Free-standing anodes composed of porous carbon nanofibers (PCNFs) were fabricated by electrospinning for use in lithium-ion batteries. The use of terephthalic acid (PTA) as the sublimating agent, one-step carbonization at 900 °C for 2 h under vacuum converts the as-prepared samples to have interconnected pores along the PCNFs interior with numerous surface openings. The electrode was characterized using scanning electron microscopy (SEM), surface area analysis (BET), x-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and Raman spectra (Raman). This strategy makes the PCNFs with a specific surface area of up to 290 m<sup>2</sup> g<sup>−1</sup>, which is significantly higher than the CNFs with 107 m<sup>2</sup> g<sup>−1</sup>. As a result, electrochemical tests exhibited that the PCNFs have a high discharge capacity of 750 mAh g<sup>−1</sup>, which is sharply higher than that of the CNFs (234 mAh g<sup>−1</sup>) at 100 mA g<sup>−1</sup>. Even at a current density of 3000 mA g<sup>−1</sup>, the PCNFs still exhibit a very high discharge capacity of 621 mAh g<sup>−1</sup>. The present study may provide an effective strategy for synthesizing low-cost, binder-free, and environmentally friendly anodes for lithium-ion batteries with outstanding properties.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"58 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-16DOI: 10.1088/2043-6262/ad6b7a
Hoang Minh Luu, Thi Thuy Thu Pham, Van Duy Nguyen, Van Tong Pham
Noble metal nanoparticles (NPs) decorated on the surface of semiconducting metal oxides to enhance the gas-sensitive properties of sensing materials have attracted considerable interest from numerous researchers worldwide. Here, we introduce an effective method to decorate Pd NPs on the surface of porous ZnO nanorods to improve NO2 gas-sensing performance. Porous ZnO nanorods were synthesized using a simple hydrothermal method without surfactant. Surface decoration of porous ZnO nanorods with Pd NPs was performed through in situ reduction of PdCl2 using Pluronic as the reducing agent. The gas-sensing properties of porous Pd-ZnO nanorods were evaluated toward NO2 toxic gas in a concentration range of 0.1–2 ppm at various operating temperatures of 25 °C–250 °C. Pd NPs decorated on the surface of porous ZnO nanorods not only improve the sensor response (3-folds) and reproducibility but also reduce the optimal operating temperature. The improvement in gas-sensing activity is attributed to the modulation of the depletion layer via oxygen adsorption and the formation of the Schottky potential barrier between Pd and ZnO through chemical and electronic mechanisms.
{"title":"Excellent NO2 sensor based on porous Pd-ZnO nanorods prepared by a facile hydrothermal method","authors":"Hoang Minh Luu, Thi Thuy Thu Pham, Van Duy Nguyen, Van Tong Pham","doi":"10.1088/2043-6262/ad6b7a","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6b7a","url":null,"abstract":"Noble metal nanoparticles (NPs) decorated on the surface of semiconducting metal oxides to enhance the gas-sensitive properties of sensing materials have attracted considerable interest from numerous researchers worldwide. Here, we introduce an effective method to decorate Pd NPs on the surface of porous ZnO nanorods to improve NO<sub>2</sub> gas-sensing performance. Porous ZnO nanorods were synthesized using a simple hydrothermal method without surfactant. Surface decoration of porous ZnO nanorods with Pd NPs was performed through <italic toggle=\"yes\">in situ</italic> reduction of PdCl<sub>2</sub> using Pluronic as the reducing agent. The gas-sensing properties of porous Pd-ZnO nanorods were evaluated toward NO<sub>2</sub> toxic gas in a concentration range of 0.1–2 ppm at various operating temperatures of 25 °C–250 °C. Pd NPs decorated on the surface of porous ZnO nanorods not only improve the sensor response (3-folds) and reproducibility but also reduce the optimal operating temperature. The improvement in gas-sensing activity is attributed to the modulation of the depletion layer via oxygen adsorption and the formation of the Schottky potential barrier between Pd and ZnO through chemical and electronic mechanisms.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"12 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-16DOI: 10.1088/2043-6262/ad6b7c
Tran Thi Ha Giang, Nguyen Thi Viet Chinh, Dao Son Lam, Dinh Chi Linh, Pham Hong Nam, Ta Ngoc Bach, Nguyen The Long, Do Hung Manh, Dang Duc Dung, Huynh Ngoc Toan, N N Poddubnaya, Tran Dang Thanh
In this report, we present results on the multiferroic properties of four nanocomposite samples of NiFe2O4-Ba0.7Ca0.3TiO3 (NFO/BCTO), which were fabricated through combinations of high-energy ball milling, heat treatment, and spark plasma sintering techniques. Structural analyses revealed that these samples simultaneously contain two phases of nano-sized NiFe2O4 (NFO) and Ba0.7Ca0.3TiO3 (BCTO) crystals. The addition of NFO into the BCTO-host did not alter the crystal structure but significantly improved the multiferroic characteristics compared to pure BCTO. Furthermore, variations in saturation magnetization (Ms) and coercivity (Hc) were investigated as a function of temperature. The results showed that Ms increased gradually with the concentration of NFO. In terms of temperature dependence, Ms(T) data deviated from the Bloch’s law with an exponent coefficient α changing in the range of 1.8–1.9, decreasing gradually as the NFO concentration increased. Meanwhile, Hc decreased gradually as the NFO concentration increased and followed the Kneller’s law in terms of temperature dependence.
{"title":"Multiferroic properties of NiFe2O4-Ba0.7Ca0.3TiO3 nanocomposites","authors":"Tran Thi Ha Giang, Nguyen Thi Viet Chinh, Dao Son Lam, Dinh Chi Linh, Pham Hong Nam, Ta Ngoc Bach, Nguyen The Long, Do Hung Manh, Dang Duc Dung, Huynh Ngoc Toan, N N Poddubnaya, Tran Dang Thanh","doi":"10.1088/2043-6262/ad6b7c","DOIUrl":"https://doi.org/10.1088/2043-6262/ad6b7c","url":null,"abstract":"In this report, we present results on the multiferroic properties of four nanocomposite samples of NiFe<sub>2</sub>O<sub>4</sub>-Ba<sub>0.7</sub>Ca<sub>0.3</sub>TiO<sub>3</sub> (NFO/BCTO), which were fabricated through combinations of high-energy ball milling, heat treatment, and spark plasma sintering techniques. Structural analyses revealed that these samples simultaneously contain two phases of nano-sized NiFe<sub>2</sub>O<sub>4</sub> (NFO) and Ba<sub>0.7</sub>Ca<sub>0.3</sub>TiO<sub>3</sub> (BCTO) crystals. The addition of NFO into the BCTO-host did not alter the crystal structure but significantly improved the multiferroic characteristics compared to pure BCTO. Furthermore, variations in saturation magnetization (<italic toggle=\"yes\">M</italic>\u0000<sub>s</sub>) and coercivity (<italic toggle=\"yes\">H</italic>\u0000<sub>c</sub>) were investigated as a function of temperature. The results showed that Ms increased gradually with the concentration of NFO. In terms of temperature dependence, <italic toggle=\"yes\">M</italic>\u0000<sub>s</sub>(<italic toggle=\"yes\">T</italic>) data deviated from the Bloch’s law with an exponent coefficient <italic toggle=\"yes\">α</italic> changing in the range of 1.8–1.9, decreasing gradually as the NFO concentration increased. Meanwhile, <italic toggle=\"yes\">H</italic>\u0000<sub>c</sub> decreased gradually as the NFO concentration increased and followed the Kneller’s law in terms of temperature dependence.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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