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Synthesis of Silver Nanoparticles Using Dichloromethane Extract of Chrysanthemum cinerariaefolium and Its Bioactivity 菊花二氯甲烷提取物合成纳米银及其生物活性研究
Pub Date : 2021-01-01 DOI: 10.4018/ijanr.293287
C. Kosgei, M. Obonyo, J. Matasyoh, James J. Owuor, Moses A. Ollengo, B. Irungu
Common methods of synthesizing metallic nanoparticles are chemical and physical. However, they are expensive and use toxic chemicals. Green synthesis is less costly and safer hence a potential alternative. Silver nanoparticles (Ag NPs) were synthesized using dichloromethane extract of Chrysanthemum cinerariaefolium and colour change from pale green to dark brown was observed. Scanning Electron Microscopy (SEM) images were faceted and others formed clusters. Transmission Electron Microscopy (TEM) images were spherical with an average size of 22.8± 17.5 nm. EDX analysis showed the nanoparticles had percentage abundance of 67.26%. Fourier-transform Infrared Spectroscopy (FTIR) analysis showed absorption bands at 3489.59 cm-1, 3217.80 cm-1, 2384.74 cm-1 , 1633.05 cm-1, 1405.08 cm-1, 1109.32 cm-1 and 505.93 cm-1. The UV-Vis analysis showed Surface Plasmon Resonance (SPR) peak at 434 nm. The nanoparticles were more active on P. aeruginosa with an MIC of 15 µg/ml while the cytotoxicity assay showed Ag NPs had an MIC of 33.33 µg/ml hence were noncytotoxic against Vero cells.
常用的金属纳米颗粒合成方法有化学和物理两种。然而,它们价格昂贵,而且使用有毒的化学物质。绿色合成成本更低,更安全,因此是一种潜在的替代方案。以菊花二氯甲烷提取物为原料合成了银纳米粒子(Ag NPs),其颜色由淡绿色变为深棕色。扫描电子显微镜(SEM)图像是面形的,其他的形成簇。透射电镜(TEM)图像呈球形,平均尺寸为22.8±17.5 nm。EDX分析显示,纳米颗粒的丰度为67.26%。傅里叶变换红外光谱(FTIR)分析显示,吸收波段分别为3489.59 cm-1、3217.80 cm-1、2384.74 cm-1、1633.05 cm-1、1405.08 cm-1、1109.32 cm-1和505.93 cm-1。紫外可见光谱分析显示表面等离子体共振(SPR)峰位于434 nm处。纳米颗粒对铜绿假单胞菌(P. aeruginosa)的MIC为15µg/ml时更有活性,而细胞毒性试验显示Ag NPs的MIC为33.33µg/ml,因此对Vero细胞无细胞毒性。
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引用次数: 1
An Approach to Prevent Air Pollution and Generate Electricity Using Nanostructured Carbon Materials 利用纳米结构碳材料防止空气污染和发电的方法
Pub Date : 2021-01-01 DOI: 10.4018/ijanr.20210101.oa1
S. Mondal, Avishek Bhadra, Souvik Chakraborty, Suraj Prasad, Shouvik Chakraborty
Pollution is one of the major threats for the environment as well as society. It causes severe problems for the living organisms and can gives birth of various unknown issues. Different sources like cars, industrial belts, fossil fuels etc. are the major causes of air pollution. Different researchers are working to develop new methods to combat air pollution. In this work, a new solution is proposed to fight against air pollution. The proposed solution is based on nanotechnology which not only fight against the air pollution but, it can generate electricity using the nanostructured carbon materials. The proposed solution can be deployed in real life scenario to reduce the air pollution and produce electricity in a large scale to provide an alternate energy resource to the society.
污染是对环境和社会的主要威胁之一。它会给生物体带来严重的问题,并可能产生各种未知的问题。汽车、工业带、化石燃料等不同的来源是空气污染的主要原因。不同的研究人员正在努力开发对抗空气污染的新方法。在这项工作中,提出了一个新的解决方案来对抗空气污染。提出的解决方案是基于纳米技术,它不仅可以对抗空气污染,而且可以利用纳米结构的碳材料发电。提出的解决方案可以在现实生活中部署,以减少空气污染和大规模发电,为社会提供替代能源。
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引用次数: 0
Study of the Structure and Properties of Nanoparticles Cynara scolymus L. Encapsulated With Sodium Carboxymethyl Cellulose Polysaccharide 羧甲基纤维素多糖钠包封猪头藻纳米颗粒的结构与性能研究
Pub Date : 2021-01-01 DOI: 10.4018/ijanr.287586
M. Tulyasheva, Sobitjan Y. Inagamov, G. Mukhamedov
In recent years, the interests of researchers are increased towards nanodrugs based on nanoparticles. The main direction of this work was to study the physicochemical, structural properties and stability of encapsulated nanoparticles, with the components from medicinal plants. Nanoparticles were obtained from the extract of the medicinal plant Сynara scolymus L. using a metal salt. Initial experimental data have shown that the originally obtained nanoparticles were not stable. Therefore, the nanoparticles were then stabilized with added sodium carboxymethylcellulose polysaccharide. It was found that new nanoencasulated nanoparticles with compounds from medicinal plants are very stable and can be a source of effective nanodrugs based on them.
近年来,研究人员对基于纳米颗粒的纳米药物越来越感兴趣。本工作的主要方向是研究药用植物成分包封的纳米颗粒的理化性质、结构性质和稳定性。采用金属盐法制备了药用植物Сynara scolymus L.提取物的纳米颗粒。最初的实验数据表明,最初获得的纳米颗粒并不稳定。因此,加入羧甲基纤维素多糖钠后,纳米颗粒稳定。研究发现,含有药用植物化合物的新型纳米囊化纳米颗粒非常稳定,可以作为基于它们的有效纳米药物的来源。
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引用次数: 0
Possibilities of the Quantitative Comparison of Catalytic Capacity in Autocatalytic Processes of Palladium-Containing Nanocatalysts 含钯纳米催化剂自催化过程中催化容量定量比较的可能性
Pub Date : 2020-01-01 DOI: 10.4018/IJANR.20200101.OA4
Z. Smanova, T. Rakhimov, M. Mukhamediev, D. Gafurova, Dilbar A. Shaxidova
When studying the nanocrystalline state, in some cases, an increase in functional activity is observed with an increase in the size of nanoparticles. In this case, the most active atoms are situated on the faces and have a higher coordination in comparison with the atoms on the tops and the edges. One of the explanations for this phenomenon is the formation of hypercycles due to the occurrence of autocatalytic processes. For oscillatory processes inherent in autocatalysis, when the parameters of a nonequilibrium process change over time, it is difficult to apply traditional methods of processing the results of analytical studies. In this regard, it is necessary to develop a methodology for a comparative study of short-term parameters of processes on the same scale, highlighting the main ones and eliminating insignificant and random ones, such as the phase shift at the beginning of self-oscillations or time-localized deviations from activity. This paper presents the results of such a study on the example of palladium-containing nanosystems in the reaction of low-temperature oxidation of CO. It is shown that the study of the behavior of nanocatalysts during the formation of hypercycles is informative using the calculated generalized parameters of the process
在研究纳米晶体状态时,在某些情况下,随着纳米颗粒尺寸的增加,可以观察到功能活性的增加。在这种情况下,最活跃的原子位于表面,与顶部和边缘的原子相比,它们具有更高的配位。对这种现象的一种解释是由于自催化过程的发生而形成超循环。对于自催化固有的振荡过程,当非平衡过程的参数随时间变化时,很难应用传统方法处理分析研究的结果。在这方面,有必要发展一种方法,在同一尺度上对过程的短期参数进行比较研究,突出主要参数,消除无关紧要和随机的参数,如自振荡开始时的相移或活动的时间局域偏差。本文以含钯纳米体系在CO低温氧化反应中的应用为例,给出了超循环过程中纳米催化剂行为的研究结果。结果表明,利用计算得到的超循环过程的广义参数,研究超循环过程中纳米催化剂的行为是有益的
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引用次数: 1
Calculation of the Boundary Dimensions of Functionally Active Nanoparticles 功能活性纳米颗粒边界尺寸的计算
Pub Date : 2020-01-01 DOI: 10.4018/IJANR.20200101.OA1
Z. Smanova, T. Rakhimov, M. Mukhamediev, D. Gafurova, Dilbar A. Shaxidova
Size is a key characteristic of nanoparticles that determines whether the objects belong to this category. Currently, there are not enough experiments on materials of the same chemical composition but of different dispersion in particle size, with equal size of the particles or grains of each sample of material investigated. In the present article, the authors show that the effect of the dispersion of the particle size determines whether the size dependence of a specific property can be calculated alternatively to the direct measurements. By finding the correlations between nano-properties and content of nanoparticles' fractions of different sizes, the boundary conditions can be calculated.
大小是纳米颗粒的一个关键特征,它决定了物体是否属于这一类。目前,对化学成分相同但粒度分散不同的材料进行的实验还不够多,所研究的每种材料样品的颗粒或颗粒大小是相同的。在本文中,作者表明,粒径分散的影响决定了某一特定性质的粒径依赖性是否可以代替直接测量来计算。通过寻找纳米性质与不同粒径颗粒含量之间的关系,可以计算出边界条件。
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引用次数: 0
Synthesis and Characterization of Mullites From Silicoaluminous Fly Ash Waste 硅铝粉煤灰废物中莫来石的合成与表征
Pub Date : 2020-01-01 DOI: 10.4018/IJANR.20200101.OA2
V. Yadav, P. Saxena, C. Lal, G. Gnanamoorthy, N. Choudhary, Bijendra Singh, Neha Tavker, Haresh S. Kalasariya, Pankaj Kumar
Fly ash is considered one of the major hazardous pollutants around the globe. Every year a million tonnes of fly ash is disposed of into the fly ash ponds which are major sites of pollution. The major fractions of fly ash are silicates, aluminates, and ferrous substances followed by minor traces element oxides. The aluminates and silicates comprise of 70% of the fly ash. The aluminates and silicates are present in fly ash in the form of crystalline mullites and sillimanites. Mullites being inert and crystalline are retractile to mineral acids. So, here the authors have reported a novel and simple step for the recovery of all the major elements of fly ash along with recovery of mullites by using hydrofluoric acid at room temperature. The method comprises of treatment of fly ash with diluted hydrofluoric acid for 12 hours under agitation. The recovered white color mullite powder, rod shaped of size 90-300 nm, was analyzed by the sophisticated instruments for the confirmation of the mullite particles.
粉煤灰被认为是全球主要的有害污染物之一。每年有一百万吨的飞灰被排入飞灰池,这是主要的污染源。粉煤灰的主要组分是硅酸盐、铝酸盐和亚铁物质,其次是微量元素氧化物。铝酸盐和硅酸盐占飞灰的70%。铝酸盐和硅酸盐以结晶莫来石和硅线石的形式存在于粉煤灰中。莫来石是惰性的结晶,对无机酸有收缩作用。因此,本文作者报告了一种在室温下使用氢氟酸回收飞灰中所有主要元素和莫来石的新颖而简单的步骤。该方法包括用稀释的氢氟酸在搅拌下处理飞灰12小时。用精密仪器对回收的白色莫来石粉末进行分析,确定莫来石颗粒为棒状,粒径为90 ~ 300 nm。
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引用次数: 12
Defect Dynamics in Graphene 石墨烯的缺陷动力学
Pub Date : 2020-01-01 DOI: 10.4018/IJANR.20200101.OA3
A. M. Malik, M. A. Shah, Nikhilesh Kumar Dilwaliya, Vikas Dahiya
The experimental and theoretical study of graphene, two-dimensional (2D) graphite, is an extremely rapidly growing field of today's condensed matter research. Different types of disorder in graphene modify the Dirac equation leading to unusual spectroscopic and transport properties. The authors studied one of the disorders (i.e., grain boundaries) and formulated a theoretical model of graphene grain boundary by generalizing the two-dimensional graphene Dirac Hamiltonian model. In this model only, the authors considered the long-wavelength limit of the particle transport, which provides the main contribution to the graphene conductance. In this work, they derived the Hamiltonian in a rotated side dependent reference frame describing crystallographic axes mismatching at a grain boundary junction and showed that properties like energy spectrum are an independent reference frame. Also, they showed one of the topological property of graphene.
石墨烯的实验和理论研究,二维(2D)石墨,是当今凝聚态研究的一个极其迅速发展的领域。石墨烯中不同类型的无序改变了狄拉克方程,导致不同寻常的光谱和输运性质。作者研究了其中一种障碍(即晶界),并通过推广二维石墨烯狄拉克哈密顿模型,建立了石墨烯晶界的理论模型。仅在这个模型中,作者考虑了粒子输运的长波长限制,这是石墨烯电导的主要贡献。在这项工作中,他们推导出了描述晶界结处晶体轴不匹配的旋转侧依赖参考系中的哈密顿量,并证明了能量谱等特性是一个独立的参考系。此外,他们还展示了石墨烯的拓扑特性之一。
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引用次数: 1
The Geometry of Higher-Dimensional Multi-Shell Clusters With Common Center and Different Centers 具有共同中心和不同中心的高维多壳团簇的几何结构
Pub Date : 2019-07-01 DOI: 10.4018/ijanr.2019070103
G. Zhizhin
In this article, it is shown that the dimension of a metal skeleton of giant palladium cluster, containing 561 atoms in five shells, is 8. The claims of some authors that the palladium cluster in this case is an E8 lattice are groundless. The internal geometry of multi-shell metal clusters with ligands and core was investigated. It is proved that the multi-shell clusters with common center and different centers have a higher dimension. Clusters with ligands and a structural unit octahedron exist with different metals in the core. A spatial image of the cobalt tetra-anion cluster is presented. It is proved that its dimension is 5. It is considered homo-element metal cycles with ligands. For example, a spatial image of the three nuclear carbonyls of ruthenium and osmium it is build. It was proved that the ligands in the three nuclear carbonyls of ruthenium and osmium do not form a ligand polyhedron, as was previously assumed. The construction of cluster in this case can be divided into two polytopes dimension of 4.
本文证明了5个壳层中含有561个原子的巨大钯团簇金属骨架的维数为8。一些作者声称在这种情况下钯簇是E8晶格是没有根据的。研究了带有配体和核的多壳金属团簇的内部几何结构。证明了具有共同中心和不同中心的多壳簇具有更高的维数。具有配体和结构单元八面体的簇以不同的金属为核心存在。给出了钴四阴离子团簇的空间图像。证明了它的维数为5。它被认为是具有配体的同元素金属循环。例如,建立了钌和锇的三个核羰基的空间图像。证明了钌和锇的三个核羰基中的配体不像先前假设的那样形成配体多面体。在这种情况下,聚类的构造可以分为两个维数为4的多面体。
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引用次数: 1
Design of Nano-Scale Devices Affecting Synapses 影响突触的纳米级器件设计
Pub Date : 2019-07-01 DOI: 10.4018/ijanr.2019070104
Rinat Galiautdinov
The research describes the nano scale devices, their general architecture, and how they affect the synapses. Such devices, based on the new approach in artificial intelligence, will play a significant role in many spheres. The research also describes the architecture of the programming neuron built on the basis of a biological one. Unlike existing technical devices for implementing a neuron based on classical nodes oriented to binary processing, the proposed path is based on bit-parallel processing of numerical data (synapses) for obtaining result. The proposed approach of implementing a neuron can serve as a new elementary basis for the construction of neuron-based computers with a higher processing speed of biological information and good survivability.
这项研究描述了纳米级设备,它们的一般结构,以及它们如何影响突触。这种基于人工智能新方法的设备将在许多领域发挥重要作用。该研究还描述了建立在生物神经元基础上的编程神经元结构。与现有的基于面向二进制处理的经典节点实现神经元的技术设备不同,所提出的路径是基于数字数据(突触)的位并行处理来获得结果。所提出的实现神经元的方法可以为构建具有更高生物信息处理速度和良好生存能力的基于神经元的计算机提供新的基础。
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引用次数: 1
Design of Nano-scale Electrodes and Development of Avatar-Based Control System for Energy-Efficient Power Engineering 节能电力工程中纳米电极的设计与avatar控制系统的开发
Pub Date : 2019-01-01 DOI: 10.4018/ijanr.2019010104
V. Mkrttchian, L. Gamidullaeva, Rinat Galiautdinov
In this article is described the avatar-based energy-efficient power engineering control system, which is based on authors results published previously related to development of an Internet of Things and people (IOTAP) and the digital twins systems. The authors are described the development of the innovation tools for digital twins system, based on Avatar-based Control Techniques.
本文描述了基于化身的节能电力工程控制系统,该系统基于作者先前发表的与物联网和人(IOTAP)以及数字孪生系统开发相关的结果。介绍了基于虚拟化身控制技术的数字孪生系统创新工具的开发。
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引用次数: 7
期刊
International Journal of Applied Nanotechnology Research
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