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2017 IEEE 7th International Conference Nanomaterials: Application & Properties (NAP)最新文献

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Polyol-synthesized plasmonic Ag nanowires for efficient solar energy conversion 用于高效太阳能转换的多元醇合成等离子体银纳米线
R. Salimi, A. A. S. Alvani, N. Naseri
In this work, the silver nanowires with an appropriate aspect ratio and plasmonic properties were successfully synthesized through a polyol process using PVP and characterized by UV-Visible Spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Density Functional Theory (DFT) calculations. UV-Visible spectra display a dual peak line shape which can be ascribed to the transverse dipole resonance (longer wavelength) and the transverse quadrupole resonance (shorter wavelength) of silver nanostructures, respectively. SEM image shows the morphologies and aspect ratios of the synthesized silver nanowires after purification by acetone centrifugation process. The diameters of most of the silver nanowires are in the range of 90–100 nm, and lengths of 1–3 μm. Consequently, asprepared Ag nanostructres with suitabe aspect ratio, satisfactory surface plasmon resonance (SPR) and conductive properties can be considered for designing new plasmonic-semiconductor composite to enhance solar energy conversion efficiency of Photoelectrochemical (PEC) and Photovoltaic (PV) cells.
本文采用多元醇法制备了具有合适宽高比和等离子体性能的银纳米线,并通过紫外可见光谱、扫描电子显微镜(SEM)、x射线衍射(XRD)和密度泛函理论(DFT)对其进行了表征。银纳米结构的紫外可见光谱呈现双峰谱线形状,分别属于波长较长的横向偶极子共振和波长较短的横向四极子共振。SEM图像显示了丙酮离心纯化后合成的银纳米线的形貌和纵横比。大多数银纳米线的直径在90 ~ 100 nm之间,长度在1 ~ 3 μm之间。因此,制备的银纳米结构具有合适的宽高比、满意的表面等离子体共振(SPR)和导电性能,可用于设计新的等离子体-半导体复合材料,以提高光电化学(PEC)和光伏(PV)电池的太阳能转换效率。
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引用次数: 0
Mass-spectra of As-S glasses evaporation As-S玻璃蒸发的质谱
V. Kovtunenko, S. Kolinko
The complicated complex nature of vapour flows of these glasses which contain about three tens of different AsmSn atomic complexes (m = 0 − 4, n = 0 − 8 …) has been revealed. By increasing the flow density of an ionizing electron beam of the mass-spectrometer the coincidence of the total mass-spectrometric composition of the vapour phase with the chemical composition of glasses before evaporation has been ensured. The presence of three types of concentration dependences for different AsmSn clusters versus the chemical composition of initial glasses: growing, decreasing, dome-shaped ones has been established. The influence of technological conditions of synthesis for As-S glasses on their mass-spectra has been revealed.
揭示了这些含三种不同AsmSn原子配合物(m = 0−4,n = 0−8…)的玻璃的蒸汽流动的复杂性质。通过增加质谱仪电离电子束的流动密度,可以保证汽相的总质谱组成与蒸发前玻璃的化学组成相一致。存在三种类型的浓度依赖于不同的AsmSn簇与初始玻璃的化学成分:生长,减少,圆顶形状的已经建立。揭示了As-S玻璃合成工艺条件对其质谱的影响。
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引用次数: 0
Spectroscopic and microscopic investigations of InFeSb diluted magnetic semiconductors prepared by laser ablation 激光烧蚀法制备InFeSb稀释磁性半导体的光谱学和显微研究
E. Gan'shina, G. Zykov, L. Golik, Z. Kun'kova, A. Rukovishnikov, M. Temiryazeva, Y. Markin, V. Lesnikov
We report optical and magneto-optical results as well as atomic force microscopy (AFM) and magnetic force microscopy (MFM) results for InFeSb samples prepared by laser ablation. AFM and MFM studies have revealed the presence of magnetic particles on the samples surface, whose sizes depend on the Fe content and substrate temperature. It has found that both optical and magneto-optical spectra are superposition of spectra from the doped InFeSb layers and particles on their surface.
我们报告了激光烧蚀制备的InFeSb样品的光学和磁光结果以及原子力显微镜(AFM)和磁力显微镜(MFM)结果。AFM和MFM研究表明,样品表面存在磁性颗粒,其大小取决于铁含量和衬底温度。研究发现,光学光谱和磁光光谱都是掺杂的InFeSb层及其表面粒子光谱的叠加。
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引用次数: 0
Magnesium-based matrix composites reinforced with nanoparticles for biomedical applications 生物医学用纳米颗粒增强镁基复合材料
K. Dyadyura, F. Sukhodub
This paper provides a mini-review on selected magnesium based materials focusing on the enhancements in mechanical properties observed with the addition of nanoparticles (NPs). The ability to improve mechanical properties with the use of smaller volume fraction of reinforcements while keeping density low makes magnesium nanocomposites an attractive choice for biomedical applications. The addition of nanoparticles to magnesium assists in enhancing multiple engineering properties that are critical for its widespread use and are superior to that exhibited by conventional micron-size particles containing composites. Metal matrix composites reinforced by NPs are very promising materials, suitable for a large number of applications. These composites consist of a metal matrix filled with NPs featuring physical and mechanical properties very different from those of the matrix. The NPs can improve the base material in terms of corrosion resistance and good biocompatibility, damping properties and mechanical strength.
本文对镁基材料进行了综述,重点介绍了纳米颗粒(NPs)对镁基材料力学性能的增强。通过使用更小体积分数的增强剂来改善机械性能,同时保持低密度的能力使镁纳米复合材料成为生物医学应用的一个有吸引力的选择。将纳米颗粒添加到镁中有助于增强多种工程性能,这对镁的广泛使用至关重要,并且优于传统的微米级颗粒含复合材料。NPs增强金属基复合材料是一种极具发展前景的材料,具有广泛的应用前景。这些复合材料由金属基体组成,填充了具有与基体截然不同的物理和机械性能的NPs。NPs可以提高基材的耐腐蚀性和良好的生物相容性、阻尼性能和机械强度。
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引用次数: 6
Surface bromination of carbon materials: A DFT study 碳材料的表面溴化:DFT研究
A. Yatsymyrskyi, L. Grishchenko, V. Diyuk, A. Zaderko, O. Boldyrieva, Vladyslav V. Lisnyak
In this work, we evaluated the reasons of the high reactivity of carbon surface in the bromination reaction. For this purpose, the active centers of carbons were simulated within the density functional theory method. It was shown that all proposed models derived from the honeycomb structure of coronene have edge double C=C bond as an active center of the surface. With an increase in the size of the carbon models, such bonds become shorter, this increases the bond order and, simultaneously, the affinity for the addition reactions becomes significant. The symmetry of models, the defects of the structure or vacancies of carbon atoms do not effect on the length of the edge double C=C bonds. We calculated the reaction thermodynamic for the interaction of C54H18 cluster with dibromine. At these processes, the functional oxygen-containing groups have a certain impact only on the nearest neighboring carbon bonding. The calculation showed that the bromine molecules attack the edge double C=C bond. This way is more energetically favorable than the substitution of hydrogen for bromine.
本文对溴化反应中碳表面高活性的原因进行了评价。为此,采用密度泛函理论方法对碳的活性中心进行了模拟。结果表明,从冕烯的蜂窝结构推导出的所有模型都有边缘双C=C键作为表面的活性中心。随着碳模型尺寸的增加,这种键变得更短,这增加了键的顺序,同时,对加成反应的亲和力变得显著。模型的对称性、结构的缺陷或碳原子的空位对边缘双C=C键的长度没有影响。计算了C54H18簇与二溴相互作用的热力学。在这些过程中,官能团含氧基团只对最近的相邻碳键有一定的影响。计算表明,溴分子攻击边缘双C=C键。这种方式在能量上比氢取代溴更有利。
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引用次数: 0
The meso- and macropores generating process via modification of NH4NO3 granules: Thermodynamic regime impact on the granule structure NH4NO3颗粒改性中、大孔生成过程:热力学机制对颗粒结构的影响
A. Artyukhov, A. Ivaniia, A. Voznyi
The article deals with justification to choose optimal thermodynamic condiions to generate porous ammonium nitrate in the vortex granulators. Advantages of granules modification are justified by way of humidification and further thermal treatment. The necessity to improve technologies for porous ammonium nitrate generation is shown with aim to form meso- and macropores on the surface of the granule and inside it. The internal and surface structure of granules is studied under different thermal treatment regimes. The results of experimental research allow to define the temperature of heat transfer agent in the working area of the vortex granulator during the proper time and to implement this index to calculate heating up kinetics and granule dehydration. Specification of the heat transfer agent's temperature index lets to perform computations, determining minimum time for granule drying, in order to avoid its unintended overheating and core destruction.
本文论述了在涡流造粒机中制备多孔硝酸铵的最佳热力学条件选择的合理性。通过加湿和进一步的热处理,证明了颗粒改性的优点。指出了改进多孔硝酸铵制备工艺的必要性,目的是在颗粒表面和颗粒内部形成中孔和大孔。研究了不同热处理条件下颗粒的内部和表面结构。实验研究结果可以确定在适当的时间内,涡流造粒机工作区内传热剂的温度,并利用该指标计算加热动力学和颗粒脱水。传热剂的温度指数规格允许进行计算,确定颗粒干燥的最短时间,以避免其意外过热和堆芯破坏。
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引用次数: 0
Gold-based nano-adjuvants 在于nano-adjuvants
E. Yavuz, E. Bagriacik
Gold nanocages (AuNCs) were synthesized via galvanic replacement method and characterized by TEM and UV-Vis-NIR. In order to investigate the adjuvant potential of AuNCs, AuNC-formulated recombinant Hepatitis B surface antigen (HBsAg) preparations were used. First, the adsorption efficiency and cumulative release percentage of newly created HBsAg-AuNC formulations were characterized. Then, their adjuvant responses in RAW 264.7 macrophages were systematically analysed in vitro by real time cell analysis system, flow cytometry, confocal microscopy, and ELISA. We have observed that HBsAg-AuNC vaccine formulations were stable and have uptaken easily by macrophages but not into the nucleus, and triggered the immune maturation of RAW 264.7 cells. Here in vitro studies have shown that Au nanocages with superior properties may be considered as a new adjuvant candidate alternative to alum.
采用电替换法制备了金纳米笼,并用TEM和UV-Vis-NIR对其进行了表征。为了研究aunc的佐剂潜力,使用aunc配制的重组乙型肝炎表面抗原(HBsAg)制剂。首先,对新制备的HBsAg-AuNC配方的吸附效率和累积释放率进行了表征。然后,通过实时细胞分析系统、流式细胞术、共聚焦显微镜和ELISA,系统地分析它们在体外RAW 264.7巨噬细胞中的佐剂应答。我们观察到HBsAg-AuNC疫苗制剂是稳定的,很容易被巨噬细胞吸收,但不进入细胞核,并触发RAW 264.7细胞的免疫成熟。这里的体外研究表明,具有优越性能的金纳米笼可能被认为是明矾的一种新的辅助候选物。
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引用次数: 2
Statistical analysis of transformer oil penetration speed through electrotechnical pressboard 变压器油通过电工压板渗透速度的统计分析
P. Rogałski, C. Kozak, I. Lebedynskyi
The paper presents a measuring stand used to measure oil penetration times of capillaries present in electrotechnical pressboard. Based on the measurements, the statistical distribution of capillaries occurring in cellulose insulation was determined. Based on the analysis of the obtained results, the presence of randomly distributed areas with reduced density was detected.
本文介绍了一种用于测量电工电路板中毛细管渗透油次数的测试台。根据测量结果,确定了纤维素绝缘材料中毛细血管的统计分布。根据对所得结果的分析,检测到存在密度降低的随机分布区域。
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引用次数: 6
Raman spectroscopy studies of Ge-As-S chalcogenide glasses 锗砷硫系玻璃的拉曼光谱研究
L. Revutska, K. Shportko, A. Stronski, J. Baran
In this study the Raman spectroscopy is employed to investigate the structural properties of Ge-As-S chalcogenide glasses. Obtained Raman data show that studied chalcogenides are nanostructurized materials. Raman spectra of Ge-As-S samples showed that the backbones of the studied samples consist of AsS3/2 pyramidal units, edge- and corner-shared Ge(S1/2)4 tetrahedral units. Compositional changes in studied glasses result in the evolution of the observed Raman bands. Such dependences of characteristic constituent Raman bands' intensities showed that Ge-As-S samples contain different nanophases whose concentration is changing along chosen compositional cross-section.
本文采用拉曼光谱研究了锗砷硫系玻璃的结构特性。得到的拉曼数据表明,所研究的硫族化合物是纳米结构材料。Ge- as -s样品的拉曼光谱表明,研究样品的骨架由AsS3/2锥体单元和边角共享的Ge(S1/2)4四面体单元组成。所研究的玻璃的成分变化导致了所观察到的拉曼带的演变。特征组分拉曼谱带强度的依赖性表明,Ge-As-S样品中含有不同的纳米相,其浓度沿所选择的组分截面变化。
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引用次数: 6
Morphologies and photoluminescence properties of porous n-InP 多孔n-InP的形貌及光致发光性能
Y. Suchikova, I. Bogdanov, S. Onishchenko, S. Vambol, V. Vambol, O. Kondratenko
The samples of porous InP were grown up by a method of anode electrochemical etching on a substrate (100) InP n-type. The samples were characterized by scanning electronic microscopy (SEM) and photoluminescence (PL) where a blue shift was observed in PL. To remove surface oxides from the surface of porous InP using the thermal cleaning of the samples in a stream of high purity hydrogen. Chemical composition of surface of porous n-InP after in hydrogen probed treatment the method of Energy dispersive X-ray spectroscopy. Size of walls between pores which makes 3–11nm.
采用阳极电化学刻蚀法在衬底(100)n型InP上生长多孔InP样品。通过扫描电子显微镜(SEM)和光致发光(PL)对样品进行了表征,在PL中观察到蓝移。利用高纯氢流对样品进行热清洗,从多孔InP表面去除表面氧化物。用能量色散x射线光谱法研究了氢探针处理后多孔n-InP表面的化学成分。孔间壁的大小为3-11nm。
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引用次数: 1
期刊
2017 IEEE 7th International Conference Nanomaterials: Application & Properties (NAP)
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