American Journal of Nano Research and Applications最新文献

Anti-Bacterial Activities of Green Synthesized ZnO and CuO Nanoparticles from Leaf Extracts of Warburgia ugandensis 绿色合成乌干达荆芥叶提取物氧化锌和氧化铜纳米颗粒的抗菌活性研究

American Journal of Nano Research and Applications Pub Date : 2023-07-31 DOI: 10.11648/j.nano.20231101.12

Lemeitaron Njenga, K. Ayabei, T. Akenga, Zipporah M. Onyambu, J. Kiptoo, M. Onani

{"title":"Anti-Bacterial Activities of Green Synthesized ZnO and CuO Nanoparticles from Leaf Extracts of <i>Warburgia ugandensis</i>","authors":"Lemeitaron Njenga, K. Ayabei, T. Akenga, Zipporah M. Onyambu, J. Kiptoo, M. Onani","doi":"10.11648/j.nano.20231101.12","DOIUrl":"https://doi.org/10.11648/j.nano.20231101.12","url":null,"abstract":": This work reports for the first time the green synthesis of zinc oxide nanoparticles (ZnO NPs) and copper oxide nanoparticles (CuO NPs) using leaf extracts of Warburgia ugandensis as encapsulating, stabilizing, and reducing agent. The green method of synthesis proved easy and less costly. The methanolic extracts contained various secondary metabolites as analyzed using gas chromatography-mass spectrometer (GC-MS). The nanoparticles (NPs) were further characterized for the confirmation of their synthesis using various techniques. Ultra violet-Visible spectrometer (UV-vis) confirmed the successful synthesis of ZnO NPs and CuO NPs with a maximum peak at 367 nm and 307.5 nm, respectively. The X-ray diffractometer (XRD) results confirmed the formation of hexagonal wurtzite ZnO NPs and monoclinic structures of CuO NPs with an average size of 21.2 nm and 12.86 nm, respectively. In addition, the Fourier transform infrared (FTIR) analysis showed the presence of various functional groups responsible for the formation of the nanoparticles. The antibacterial activity of the formulated nanoparticles was also investigated against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacterial strains with ZOI (Zones of Inhibition) measured in mm. The green synthesized ZnO nanoparticles using Warburgia ugandensis leaf extracts significantly revealed higher anti-bacterial potentials against E. coli (9.6 ± 0.9 mm) compared to both CuO NPs and ampicillin. This shows that they can be applied in the field of medicine to develop antibacterial agents to treat various ailments.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123536087","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}

引用次数: 0

Utilization of Algae for the Green Synthesis of Silver Nanoparticles and Their Applications 利用藻类绿色合成纳米银及其应用

American Journal of Nano Research and Applications Pub Date : 2023-03-09 DOI: 10.11648/j.nano.20231101.11

S. Singh, Preeti Maurya, Khushaboo Soni

引用次数: 1

Synthesis of Silver Nanoparticles Using Dichloromethane-Methanol Flower Extract of Chrysanthemum cinerariaefolium and Its Antibacterial Activity 菊花二氯甲烷-甲醇提取物合成纳米银及其抑菌活性研究

American Journal of Nano Research and Applications Pub Date : 2021-02-23 DOI: 10.11648/J.NANO.20210901.11

C. Kosgei, F. Tolo, J. Matasyoh, M. Obonyo, P. Mwitari, L. Keter, James J. Owuor, Moses A. Ollengo, B. Irungu

{"title":"Synthesis of Silver Nanoparticles Using Dichloromethane-Methanol Flower Extract of Chrysanthemum cinerariaefolium and Its Antibacterial Activity","authors":"C. Kosgei, F. Tolo, J. Matasyoh, M. Obonyo, P. Mwitari, L. Keter, James J. Owuor, Moses A. Ollengo, B. Irungu","doi":"10.11648/J.NANO.20210901.11","DOIUrl":"https://doi.org/10.11648/J.NANO.20210901.11","url":null,"abstract":"Nanotechnology is an emerging field that has opened new horizons in nanomedicine. The use of silver nanoparticles is attracting much interest because of their antibacterial activity. This study involved synthesis of silver nanoparticles using Chrysanthemum cinerariaefolium flowers dichloromethane-methanol crude extract. The synthesized silver nanoparticles (Ag NPs) were characterized using UV-Vis spectroscopy, SEM, EDX, TEM and FTIR. The antibacterial potential of the nanoparticles was ascertained against methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, Staphylococcus aureus and Shigella sonnei. This was followed by phytochemical analyses of the crude extracts. The Ag NPs were generally spherical as observed in the SEM and TEM micrographs with an average size of 26.98 nm. The UV- absorption spectrum revealed prominent peak at 430 nm while EDX analysis showed the percentage abundance of silver nanoparticle at (81.33%). The FTIR spectroscopy confirmed absorption bands of various functional groups on the surface of Ag NPs. The absorption bands were at 3472.88 cm-1, 3190.67 cm-1, 1646.61 cm-1, 1405.08 cm-1, 1109.32 cm-1 and 518.64 cm-1. Antibacterial potential of the synthesized Ag NPs showed that they were more active on S. aureus with an MIC of 31.25 µg/ml. The phytochemicals observed in the crude extracts that could have been responsible for reducing silver ions into silver nanoparticles were flavonoids, phenols, tannins and glycosides.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128675852","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}

引用次数: 0

On Guided Remagnetization in Layered Anoheterostructures 层状异质结构的引导再磁化研究

American Journal of Nano Research and Applications Pub Date : 2020-02-01 DOI: 10.11648/J.NANO.20190704.11

A. Korostil

{"title":"On Guided Remagnetization in Layered Anoheterostructures","authors":"A. Korostil","doi":"10.11648/J.NANO.20190704.11","DOIUrl":"https://doi.org/10.11648/J.NANO.20190704.11","url":null,"abstract":"Field-guided magnetic dynamics in magnetic multilayer nanostructures involves interconnection of the control field with localized spin states, which can occur directly or indirectly depending on the nature of the field and spin polarization. At the control electromagnetic field, this interconnection can be directly induced by the photon-induced spin-flip processes and indirectly by a bias field during antiferromagnetic exchange relaxation. The control impact of electric field and electric current on the magnetic states occurs indirectly via the spin polarization and spin current in combination with the exchange interaction of these polarized spins with localized magnetic states. The corresponding description of the magnetic dynamics is based on the modified Landau-Lifshitz equation and spin diffusion equations, taking into account the spin Hall and the inverse spin Hall effects for systems with normal metal sublayers. In the case of the magnetic nanostructures with the Rashba spin-orbit interaction in interfaces, the electric field-controlled magnetization is realized via the Rashba field-induced spin polarization, and its exchange interaction with localized magnetic states. Corresponding description is based on a tight-binding model of spin-orbit-coupled electrons exchange coupled to the localized magnetic states.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134343384","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}

引用次数: 0

A Study on the Effect of Fibre Dimensions on the Thermal Conductivity of Pineapple Leaf Fibre Reinforced Polypropylene Composites 纤维尺寸对菠萝叶纤维增强聚丙烯复合材料导热性能影响的研究

American Journal of Nano Research and Applications Pub Date : 2019-12-09 DOI: 10.11648/J.NANO.20190703.11

Samuel Wadzani Gadzama, Olufemi Kashim Sunmonu, Umaru Semo Isiaku, A. Danladi

{"title":"A Study on the Effect of Fibre Dimensions on the Thermal Conductivity of Pineapple Leaf Fibre Reinforced Polypropylene Composites","authors":"Samuel Wadzani Gadzama, Olufemi Kashim Sunmonu, Umaru Semo Isiaku, A. Danladi","doi":"10.11648/J.NANO.20190703.11","DOIUrl":"https://doi.org/10.11648/J.NANO.20190703.11","url":null,"abstract":"This research was carried out to study the thermal conductivity (TC) properties of pineapple leaf fibre (PALF) reinforced polypropylene (PP) composites. The pineapple leaf fibre dimensions were altered specifically at the macro, micro and nano dimensional states. It was considered that the thermal conductivity (TC) behavior of pineapple leaf fibre/polypropylene (PALF/PP) composites would be significantly higher when the pineapple leaf fibre which is the reinforcement agent undergoes dimensional changes. The study also considered the effect the fibre surface modification agents would have on the thermal behavior of the reinforced pineapple leaf fibre /polypropylene composites. The fibre surface modification agents used in this study are sodium hydroxide, zinc chloride, acetic anhydride and nitric acid. The guided plate steady state approach for determining thermal conductivity was used in this research. Results showed that the micro and nano fibrils of the reinforcing agent contributed to the enhanced thermal conductivity behavior of the reinforced pineapple leaf fibre/polypropylene composites. The results obtained also showed that the reinforced microfibrils pineapple leaf fibre /polypropylene composites and reinforced nanofibrils pineapple leaf fibre/polypropylene composites modified with nitric acid exhibits higher thermal conductivity than reinforced pineapple leaf fibre/polypropylene (PALF/PP) composites modified with acetic anhydride, zinc chloride, sodium hydroxide and the unmodified pineapple leaf fibre in descending order respectively.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130057462","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}

引用次数: 3

Fabrication of Electrospun Polycaprolactone/Gelatin Composite Nanofibrous Scaffolds with Cellular Responses 具有细胞响应的电纺聚己内酯/明胶复合纳米纤维支架的制备

American Journal of Nano Research and Applications Pub Date : 2019-11-08 DOI: 10.11648/J.NANO.20190702.11

Jaianand Kannaiyan, Saurabh Khare, S. Narayanan, Firdosh Mahuvawalla

{"title":"Fabrication of Electrospun Polycaprolactone/Gelatin Composite Nanofibrous Scaffolds with Cellular Responses","authors":"Jaianand Kannaiyan, Saurabh Khare, S. Narayanan, Firdosh Mahuvawalla","doi":"10.11648/J.NANO.20190702.11","DOIUrl":"https://doi.org/10.11648/J.NANO.20190702.11","url":null,"abstract":"Numerous wound care products have been investigated for skin tissue engineering. Factors which influence to skin substitute selection are condition of patient, wound depth, infection in wound. Other factors which also play role in deciding skin substitute are cost, its availability, ease of storage, required operative interventions. With perspective of Indian market, commercial available skin substitutes are either costly or their availability restricted to major cities only. A cost effective skin substitute is strongly needed to heal wounds with minimal scarring and maximum function. The aim of this study was to investigate the possibility of synthetic scaffold loaded with Wharton’s jelly derived Mesenchymal stem cells and to access the role of scaffolds in proliferation and differentiation of MSCs in-vitro, in order to achieve for the healing of wound graft substitutes with improved biological properties. As a result, WJ-MSCs were isolated, harvested and seeded on the surface of the fabricated PCL/GE nanofibrous scaffold. The biological properties and growth of MSCs were studied for anti-inflammation, cytotoxicity, cell proliferation, and SEM analysis indicated that the fabricated synthetic scaffold supported cells attachment, viability, and proliferation of cells. The characterization studies of nanofibers were studied for ATR-FTIR, XRD, TEM, viscosity, and degradation studies suggest that the nanofibrous scaffold loaded with stem cells could be an excellent tissue-engineered skin base for wound healing and skin regeneration.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125834814","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}

引用次数: 4

Synthesis and Characterization of Titanium (iv) Oxide Loaded with Silver Nano Particles Thin Films 负载银纳米颗粒的氧化钛薄膜的合成与表征

American Journal of Nano Research and Applications Pub Date : 2019-04-23 DOI: 10.11648/J.NANO.20190701.11

S. Balogun, Afolabi Bola Abdulhamid, Y. K. Sanusi, A. Oluwaseun

{"title":"Synthesis and Characterization of Titanium (iv) Oxide Loaded with Silver Nano Particles Thin Films","authors":"S. Balogun, Afolabi Bola Abdulhamid, Y. K. Sanusi, A. Oluwaseun","doi":"10.11648/J.NANO.20190701.11","DOIUrl":"https://doi.org/10.11648/J.NANO.20190701.11","url":null,"abstract":"This research investigates effect of annealing temperature on the optical properties of titanium dioxide loaded with silver nanoparticles (TiO2: AgNPs) thin films deposited on glass substrate by spin–coating technique. Silver nanoparticles was prepared using laguminosae-paplionodeae extracts as a reducing agent for silver nitrate and commercially available titanium (iv) oxide was used. Deposition of TiO2:AgNPs blend solution was done in different volume ratio. The blend solution volume ratio of (1:0.2) was deposited at 7 different thicknesses with different speed of revolution per minutes (rpm) for 30 seconds. Annealing of 16 samples deposited at 1000 rpm on the glass substrate was carried out at temperature range of 50°C to 425°C with 10°C interval in a tubular furnance. It is observed from the results that the peak absorption of photon energy occurred at 375°C in the visible range of the wavelength spectrum. Optimal thickness for peak absorbance of the TiO2:AgNPs blend layer occurred at 115 nm in the visible spectrum and at the corresponding spin speed of 1000 rpm. Optimized fabrication process with blend layer thickness of 115 nm yielded the best absorbance at annealed temperature of 375°C in the visible spectrum. The volume ratio of (1:0.2) gave the peak absorption at 0.75 a u. The band gap energy of the blend thin film is 3.58 eV at 375°C in the visible range of wavelength spectrum. It is revealed from the result that the light absorption, broadened absorption spectral range and thermal stability of titanium (iv) oxide film could be enhanced using silver nanoparticles. The results can be therefore used as a guideline for improving the design and fabrication of organic solar cells.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123924410","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}

引用次数: 7

Investigation on the Electronic Structure of Nanosized Barium Monosilicide Films Produced by Low-energy Implantation of Ba⁺ Ions in Si 低能注入Ba+离子制备纳米单硅化钡薄膜的电子结构研究

American Journal of Nano Research and Applications Pub Date : 1900-01-01 DOI: 10.11648/j.nano.20210904.11

G. Imanova, I. Bekpulatov

引用次数: 2

Multiscale Composites of Kevlar Fibers and Carbon Nanotubes in Epoxy Matrix 环氧基芳纶纤维与碳纳米管的多尺度复合材料

American Journal of Nano Research and Applications Pub Date : 1900-01-01 DOI: 10.11648/j.nano.20210902.11

Numrah Sultan, M. Nazir, Urooj Zahra Khan, T. Subhani

{"title":"Multiscale Composites of Kevlar Fibers and Carbon Nanotubes in Epoxy Matrix","authors":"Numrah Sultan, M. Nazir, Urooj Zahra Khan, T. Subhani","doi":"10.11648/j.nano.20210902.11","DOIUrl":"https://doi.org/10.11648/j.nano.20210902.11","url":null,"abstract":": Hybrid composites with high strength to weight ratio are very important in structural applications. An extensive research is being carried out to enhance the mechanical properties of composites by incorporating micro and nanoscale reinforcements. The nanoreinforcements provide unique strengthening mechanisms that result in an overall high mechanical performance of composites. In order to investigate the effect of nanoreinforcements on the mechanical properties of fiber reinforced composites a novel multiscale composites of Kevlar fibers and carbon nanotubes in epoxy matrix were prepared in this research. A combination of hand layup and vacuum bagging technique was used to manufacture multiscale composites. Nanotubes at three different concentrations, i.e. 0.33wt%, 0.66wt% and 0.99wt% were incorporated after their functionalization through ultraviolet ozone-treatment to improve their interfacial interaction with epoxy matrix. The microstructural and mechanical property characterization of multiscale composites was performed by optical and electron microscopy, and tensile, hardness and interlaminar shear testing. An increase of ~45% in tensile strength was noted by incorporating 0.99wt% of nanotubes while the improvements of ~60% in hardness and ~13% rise in interlaminar shear strength were observed. The improved mechanical performance owes to the uniform dispersion of nanotubes along with their adherence to nanotubes promoting anchoring effect between fibers and matrix.","PeriodicalId":298690,"journal":{"name":"American Journal of Nano Research and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132811006","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}

引用次数: 0