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Biosynthesis of Copper Oxide Nanoparticles and Its Antimicrobial Activities 纳米氧化铜的生物合成及其抗菌活性研究
Pub Date : 2018-07-22 DOI: 10.30799/jnst.141.18040413
K. Buvaneswari, R. Revathy
An environmental friendly approach is employed to synthesize copper oxide nano particles. In the present study copper oxide nanoparticles were synthesized using plant extract of Phyllanthus amarus (kelanelli). The synthesized nanoparticles were characterized using XRD, FT-IR and SEM to understand the structural and morphological characteristics of the copper oxide nanoparticles. The XRD results show that the average crystalline particle size was found to be 26.8 nm and from SEM studies it was found that these nanoparticles exist in cubic structure. CuO nanoparticles have much potential against the pathogens like Pseudomonus sp ., E. coli and Trichoderma sp ., etc.
采用一种环境友好的方法合成氧化铜纳米颗粒。本研究以毛莨属植物提取物为原料合成了氧化铜纳米颗粒。利用XRD、FT-IR和SEM对合成的纳米铜进行表征,了解纳米铜的结构和形态特征。XRD结果表明,纳米颗粒的平均晶粒尺寸为26.8 nm, SEM结果表明,纳米颗粒呈立方结构。氧化铜纳米颗粒对假单胞菌、大肠杆菌、木霉等病原菌具有很强的抗菌活性。
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引用次数: 2
Synthesis, Characterization and Antibacterial Activity of Zinc Oxide Nanoparticles 氧化锌纳米颗粒的合成、表征及抗菌活性研究
Pub Date : 2018-07-22 DOI: 10.30799/jnst.138.18040410
V. Keerthika, A. Ananth, M. Rajan
Zinc oxide nanoparticles were synthesized by a chemical method and characterized by various analytical techniques such as UV-visible spectroscopy, SEM-EDX, XRD, and FTIR. X-ray diffraction and SEM analysis confirmed the formation of well- dispersed zinc oxide nanoparticles with average particle size 22 nm as well as revealed their spherical structure. Chemically synthesized nanoparticles were found to exhibit antibacterial activity against bacterial strains Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus using agar well diffusion method of analysis.
采用化学方法合成了氧化锌纳米颗粒,并用紫外可见光谱、SEM-EDX、XRD和FTIR等分析技术对其进行了表征。x射线衍射和扫描电镜分析证实了氧化锌纳米颗粒的形成,平均粒径为22 nm,具有良好的分散性和球形结构。采用琼脂孔扩散法对大肠杆菌、铜绿假单胞菌和金黄色葡萄球菌进行了抑菌实验。
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引用次数: 5
Synthesis and Photocatalytic Studies of Fe3O4 Nanoparticles 纳米Fe3O4的合成及光催化研究
Pub Date : 2018-07-22 DOI: 10.30799/JNST.135.18040411
P. Prasad, P. Reddy, A. G. Assefa, V. Rao, G. N. Rao
Advances in nanoscience and nanotechnology are centered in the control of size and shape of nanoparticles, as well as attainment of the extended arrangement of nanoparticles in different structures. One dimensional nanostructured magnetic materials are interesting because of their enhanced magnetic properties and potential applications such as information storage and gas sensor. The advanced electronic applications of Fe3O4 magnetic nanomaterials are considered to require improvement in the powder processing, particularly, meticulous particle control in the nanometer range and phase purity. Structural properties of Fe3O4 nanoparticles were synthesized via sol-gel protocol, the morphology and particles size were determined by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy dispersive X-ray, UV- diffuse reflectance spectrophotometer and particle size analyzer. The structure of as prepared Fe3O4 nanoparticles was used for photocatalytic applications.
纳米科学和纳米技术的进步集中在纳米颗粒的大小和形状的控制,以及纳米颗粒在不同结构中的扩展排列的实现。一维纳米结构磁性材料由于其增强的磁性和潜在的应用如信息存储和气体传感器而引起了人们的兴趣。Fe3O4磁性纳米材料的先进电子应用需要在粉末加工方面进行改进,特别是在纳米范围内精细的颗粒控制和相纯度。采用溶胶-凝胶法合成了Fe3O4纳米颗粒的结构性质,通过x射线衍射、扫描电镜、透射电镜、能量色散x射线、紫外漫反射分光光度计和粒度分析仪对其形貌和粒径进行了测定。所制备的Fe3O4纳米颗粒结构用于光催化应用。
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引用次数: 1
Nano-Dimensional Properties of Si-FinFET Transistor Based on ION/IOFF Ratio and Subthreshold Swing (SS) 基于离子/IOFF比和亚阈值摆幅(SS)的si - finet晶体管纳米尺度特性
Pub Date : 2018-07-15 DOI: 10.30799/jnst.132.18040408
A. Mahmood, Y. Hashim, H. Manap
This paper presents design the optimal channel dimensions for Silicon Fin Feld Effect Transistor (Si-FinFET) for improvement electrical characteristic of Si-FinFET depending on the electrical characteristics of the channel (I ON /I OFF , SS, VT, DIBL). The MuGFET simulation tool has been using to investigate the electrical characteristics of Si-FinFET. The current voltage characteristics has been simulating with different dimensions channel (length, width and oxide thickness). The best channel dimensions of Si-FinFET observed based on electrical characteristics at the working voltage VDD range of 0-5 V. Note that the results with the scaling channel dimensions. Depending on I ON /I OFF ratio higher value, and nearest SS to the ideal SS, the best scaling channel dimensions (K) will be K=0.25 at VDD=5 V and K=0.25 at VDD=0.5 V.
本文根据硅鳍场效应晶体管(Si-FinFET)的电学特性(I on /I OFF, SS, VT, DIBL),设计了硅鳍场效应晶体管(Si-FinFET)的最佳沟道尺寸,以改善硅鳍场效应晶体管的电学特性。MuGFET仿真工具已被用于研究Si-FinFET的电特性。模拟了不同尺寸通道(长度、宽度和氧化物厚度)的电流电压特性。基于工作电压VDD范围为0-5 V时的电特性,观察到Si-FinFET的最佳沟道尺寸。注意,结果与缩放通道尺寸有关。根据I on /I OFF比较高的值,以及最接近理想SS的SS,最佳缩放通道尺寸(K)将是VDD=5 V时K=0.25和VDD=0.5 V时K=0.25。
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引用次数: 1
Interrogating the Electrochemical Potential of Senna obtusifolia Mediated Biosynthesized Silver Nanoparticles 塞纳草介导的生物合成纳米银的电化学电位研究
Pub Date : 2018-07-14 DOI: 10.30799/jnst.126.18040407
S. Mamuru, Maxwell Happy
Hazards and toxicity associated with the physical and chemical synthesis protocol of metal nanoparticles has recently led researchers to seek alternative routes that is eco-friendly, cheap and fast; the green chemistry approach where plant extracts and microorganisms are used in the reduction of the metal salt is fast gaining popularity in the field of nanobiotechnology. However, controversy still trails acceptability; furthermore, electrochemical studies on these metal nanoparticles are limited. In this study, silver nitrate was reduced to its “nano silver form” through a one-step synthesis protocol using leaf extract of Senna obtusifolia . The usual microscopic and spectroscopic techniques such as UV-vis., FTIR, SEM, AFM and XRD were used to confirm the formation of silver nanoparticles. Electrochemical characterization using cyclic voltammetry and impedance spectroscopy further reveals the formation of silver nanoparticles via a redox process of Ag 1+ to Ag 0 with a formal potential value of 0.61 V vs. Ag|AgCl 3 M KCl.
最近,金属纳米颗粒的物理和化学合成方案的危害和毒性导致研究人员寻求环保,廉价和快速的替代路线;利用植物提取物和微生物进行金属盐还原的绿色化学方法在纳米生物技术领域得到了迅速发展。然而,争议仍未被接受;此外,对这些金属纳米颗粒的电化学研究是有限的。本研究以番泻叶提取物为原料,通过一步法合成硝酸银为“纳米银”。常用的显微和光谱技术,如紫外-可见。采用FTIR、SEM、AFM、XRD等方法对纳米银的形成进行了表征。利用循环伏安法和阻抗谱进行的电化学表征进一步揭示了Ag 1+到Ag 0的氧化还原过程形成的银纳米颗粒,其形式电位值为0.61 V vs. Ag|AgCl 3 M KCl。
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引用次数: 0
Synthesis and Characterization of Silver Nanoparticles using Padina pavonica Extract and Evaluation of Their Antibacterial Activity 金莲花提取物制备银纳米粒子及其抑菌活性评价
Pub Date : 2018-07-07 DOI: 10.30799/JNST.124.18040406
G. Sudha, A. Balasundaram
Nanoparticles are the basic essential elements in the wall of nanotechnology and it exhibits fabulous advanced characteristic features based on their properties such as size, morphology and other size dependent properties. In this study, marine algae Padina pavonica (Linn.) was used for the biosynthesis of silver nanoparticles. The biosynthesized silver nanoparticles were characterized with UV-vis spectroscopy, FTIR and SEM. The SEM analysis showed the particle size between 20-70 nm as well as the polydispersed spherical structure of the nanoparticles. The extract of marine alga P. pavonica (Linn.) as well as silver nanoparticles were tested against gram positive Staphylococcus aureus, Bacillus subtilis and gram negative bacteria as Escherichia coli and Pseudomonas aeruginos . The P. pavonica based silver nanoparticles significantly inhibited the growth of bacteria. The AgNPs possess potential antibacterial activity than algae extract. This novel highly stable spherical polydispersed Ag nanoparticles were synthesized using a simple environmental friendly green method and can be used for antibacterial agent.
纳米粒子是纳米技术中最基本的元素,基于它们的特性,如尺寸、形态和其他与尺寸相关的特性,纳米粒子表现出令人难以置信的先进特征。在本研究中,利用海藻Padina pavonica (Linn.)进行纳米银的生物合成。采用紫外可见光谱、红外光谱和扫描电镜对合成的纳米银进行了表征。SEM分析表明,纳米颗粒粒径在20 ~ 70 nm之间,呈多分散球形结构。研究了海洋藻类P. pavonica (Linn.)提取物和纳米银对革兰氏阳性金黄色葡萄球菌、枯草芽孢杆菌和革兰氏阴性细菌大肠杆菌和铜绿假单胞菌的抑制作用。银纳米粒子对细菌生长有明显的抑制作用。与藻类提取物相比,AgNPs具有潜在的抗菌活性。采用简单环保的绿色方法合成了具有高稳定性的球形多分散银纳米颗粒,可作为抗菌剂。
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引用次数: 3
Silver Nanoparticles: The Powerful Antidote for Bacterial Blight Disease of Pomegranate 银纳米粒子:石榴细菌性枯萎病的强力解毒剂
Pub Date : 2018-07-07 DOI: 10.30799/JNST.123.18040405
Sherkhane As, . H.H.Suryawanshi, P. Mundada, . B.P.Shinde
Successful cultivation is difficult to pomegranate growers due to Xanthomonas axonopodis pv. punicae which cause bacterial blight disease to pomegranate has become serious threat. However, everyone is looking for solution; this problem is resolved by synthesizing silver nanoparticles by the reduction of silver ions in aqueous solutions with the help of green synthesis method. The causative agent was isolated from the infected pomegranate fruits and was tested with silver nanoparticles which are synthesized from leaf extracts of tulsi and neem; and it was found that silver nanoparticle from tulsi extract with 15 mM concentration showed maximum zone of inhibition 22 mm and 19 mm for neem, while at 1 mM concentration shows minimum. This study showed that synthesized silver nanoparticles are powerful weapon to control the growth of Xanthomonas axonopodis pv. punicae.
由于黄单胞菌(Xanthomonas axonopodis pv),石榴种植者很难成功栽培。引起石榴细菌性枯萎病的石榴虫已成为石榴的严重威胁。然而,每个人都在寻找解决方案;利用绿色合成方法,通过还原水溶液中的银离子合成纳米银,解决了这一问题。从受感染的石榴果实中分离出病原体,用杜尔丝叶提取物和印楝叶提取物合成纳米银颗粒进行检测;结果表明,当浓度为15 mM时,银纳米颗粒对印楝的抑制区最大,分别为22 mM和19 mM,而在浓度为1 mM时抑制区最小。本研究表明,合成的纳米银粒子是控制轴索黄单胞菌生长的有力武器。punicae。
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引用次数: 1
Copper Oxide Nanoparticles Toxicity on Eisenia fetida Earthworms and Bacterial Species 氧化铜纳米颗粒对臭Eisenia fetida蚯蚓和细菌的毒性
Pub Date : 2018-06-21 DOI: 10.30799/jnst.106.18040404
K. Pavani, K. Gayathramma, Priyanka Aduri
The extensive use of nanoparticles (NPs) in a variety of applications has raised great concerns about their environmental fate and biological effects. To investigate the role of CuO NPs in soil on microbes and earthworms, we exposed microorganisms and earthworms ( Eisenia fetida ) to different concentrations of CuO NPs E. fetida to CuO NPs is not dose related. Dose related weight loss of earthworms was noticed after 15 days of exposure. This study will be very useful in regulation of nanomaterials that are entering into the environment.
纳米颗粒在各种应用中的广泛使用引起了人们对其环境命运和生物效应的极大关注。为了研究土壤中CuO NPs对微生物和蚯蚓的作用,我们将微生物和蚯蚓(Eisenia fetida)暴露于不同浓度的CuO NPs中,发现fetida对CuO NPs的影响与剂量无关。暴露15天后,蚯蚓出现了剂量相关的体重减轻。这项研究将对纳米材料进入环境的调控非常有用。
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引用次数: 0
Bio-Synthesis and Characterization of Copper Molybdate Nanoparticles 钼酸铜纳米颗粒的生物合成与表征
Pub Date : 2018-06-20 DOI: 10.30799/JNST.120.18040403
P. Santhiyadevi, K. Buvaneswari
In the present work CuMoO 4 and P/CuMoO 4 nanoparticles were synthesized by simple precipitation method. The synthesized molybdate nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). XRD results show that the average crystalline size of CuMoO 4 and P/CuMoO 4 nanoparticles were found to be 62.9 nm and 59.7 nm respectively. SEM results showed that CuMoO 4 nanoparticles composed of sphere like structure and P/CuMoO 4 with agglomeration. Four absorption bands at 721, 828, 898 and 967 cm -1 were observed in FT-IR spectrum. The sharp adsorption peak at 270-350 nm was observed in UV–vis DRS technique. The antimicrobial activities of synthesized nanoparticles were observed against various pathogens.
本文采用简单沉淀法合成了cumoo4和P/ cumoo4纳米颗粒。采用傅里叶变换红外光谱(FT-IR)、x射线衍射(XRD)、扫描电镜(SEM)和紫外可见漫反射光谱(UV-vis DRS)对合成的钼酸盐纳米颗粒进行了表征。XRD结果表明,cumoo4和P/ cumoo4纳米颗粒的平均晶粒尺寸分别为62.9 nm和59.7 nm。SEM结果表明,cumoo4纳米颗粒由球形结构和P/ cumoo4组成。FT-IR光谱在721、828、898和967 cm -1处观察到4条吸收带。紫外-可见DRS技术在270 ~ 350 nm处观察到尖锐的吸附峰。观察了合成的纳米颗粒对多种病原菌的抑菌活性。
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引用次数: 5
Acute Toxicity Study of Silver Nanoparticle Coupled with Euphorbia thymifolia 纳米银与大戟的急性毒性研究
Pub Date : 2018-06-13 DOI: 10.30799/jnst.125.18040402
Srimoyee Saha, N. Bala, R. Basu, Sukhen Das
Article history: Received 20 May 2018 Accepted 08 June 2018 Available online 13 June 2018 Nanomedicine is widely explored nowadays for treatment of life threatening diseases, yet comes with various challenges and questions. The present study encapsulates the acute toxicological aspects of the Euphorbia thymifolia coupled silver nanoparticles (ET-Ag NP). For acute toxicity studies according to OCED (Organization for Economic Cooperation Development) guidelines Swiss Albino mice (6-8 weeks) were used and were given single intraperitoneal dose of 2000 and 5000 mg/kg body weight and were observed for mortality and other side effects for 14 days. The individual components of the formulation, viz. silver oxide in surface modified nano form and at low dose, and Euphorbia thymifolia are both biocompatible materials. No changes were found for general appearance, behavior and body weight, thus concluding that the nanocomposite formulation does not have single dose toxicity.
文章历史:接收2018年5月20日接收2018年6月08日在线2018年6月13日纳米医学在治疗危及生命的疾病方面得到了广泛的探索,但也面临着各种挑战和问题。目前的研究封装的急性毒理学方面的大戟偶联银纳米粒子(ET-Ag NP)。根据经济合作发展组织(OCED)指南进行急性毒性研究,使用瑞士白化病小鼠(6-8周),并给予2000和5000 mg/kg体重的单次腹腔剂量,观察14天的死亡率和其他副作用。该制剂的单个组分,即表面改性纳米形式和低剂量的氧化银,以及大戟都是生物相容性材料。总体外观、行为和体重没有变化,因此得出结论,纳米复合制剂不具有单剂量毒性。
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引用次数: 3
期刊
Journal of Nanoscience and Technology
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