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

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Improved design josephson junctions with hybrid nanostructured barriers 采用混合纳米结构屏障改进设计约瑟夫森结
V. Shaternik, O. Suvorov, A. Shapovalov, T. Prikhna, T. Serbenyuk
New type of Josephson junctions with hybrid nanostructured barriers has been fabricated and investigated. Heterostructures consisting of superconducting MoRe electrodes with a critical temperature about 9 K and a silicon film with a thickness of several dozens of nm (sandwiched between them) were fabricated. The silicon layer was doped by tungsten with various atomic concentrations. By using an atomic force microscope we have investigated a relief of the every layer of the fabricated Josephson junction, as a result it has been demonstrated a possibility to observe a formation of the cluster structure of tungsten in the silicon layer in the Josephson junction barrier on a nano-sized level. Measured I-V curves of these junctions demonstrate that the well-known parameter of these junctions (named the characteristic voltage) has record values. The observation is explained as the fingerprint of “open” channels in the charge transmission due to resonance-percolating trajectories inside the strongly inhomogeneous silicon interlayer with metallic nanoclusters.
制备并研究了具有杂化纳米结构屏障的新型约瑟夫森结。制备了临界温度约为9k的超导MoRe电极和厚度为几十nm的硅薄膜(夹在它们之间)组成的异质结构。在硅层中掺杂不同原子浓度的钨。我们利用原子力显微镜研究了制备的约瑟夫森结的每一层的位移,从而证明了在纳米水平上观察约瑟夫森结势垒中硅层中钨簇结构形成的可能性。这些结的实测I-V曲线表明,这些结的众所周知的参数(称为特征电压)具有记录值。这一观察结果被解释为电荷传输中“开放”通道的指纹,这是由于具有金属纳米团簇的强非均匀硅夹层内的共振渗透轨迹造成的。
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引用次数: 0
Forced coupled motion of the nanoparticle magnetic moment and the whole nanoparticle in a viscous fluid 纳米颗粒磁矩与整个纳米颗粒在粘性流体中的强迫耦合运动
T. V. Lyutyy, Elena Stanislavovna Denisova, A. Kvasnina
We considered the coupled motion of the magnetic moment of a ferromagnetic uniaxial nanoparticle and its mechanical rotation about the center of mass. This particle is supposed to be placed into a viscous liquid and excited by an external alternating magnetic field. Two modes of motion were studied analytically in the noise-free approximation. Within the first mode, both the nanoparticle magnetic moment and easy axis perform small oscillations around the initial position. The oscillation amplitudes were obtained in the harmonic approximation. Just the magnetic moment demonstrates the resonant behaviour that causes the main features of the oscillation mode. Within the second mode, the nanoparticle magnetic moment and easy axis are rotated synchronously. In this case we obtained the system of algebraic equations, where the precession and lag angles of the magnetic moment and easy axis are the solutions of these equations. The results obtained allow to make an analysis of the mechanism of ferrofluids heating by alternating magnetic fields.
我们考虑了铁磁单轴纳米粒子的磁矩及其绕质心的机械旋转的耦合运动。这种粒子应该被放入粘性液体中,并由外部交变磁场激发。在无噪声近似下对两种运动模式进行了解析研究。在第一种模式下,纳米粒子的磁矩和易轴都围绕初始位置进行小的振荡。在谐波近似下得到了振动幅值。仅磁矩就证明了引起振荡模式主要特征的谐振行为。在第二种模式下,纳米粒子的磁矩和易轴同步旋转。在这种情况下,我们得到了一个代数方程组,其中磁矩和易轴的进动角和滞后角是这些方程的解。所得结果可以对交变磁场加热铁磁流体的机理进行分析。
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引用次数: 0
Investigation of optical properties of ferrofluid by using magneto-optical transmission and linear dichroism 利用磁光传输和线性二色性研究铁磁流体的光学性质
Mert Akyurekli, Meltem Gonulol, Alper Bayram, I. Yariçi, Y. Ozturk
In this study, optical properties of produced magnetic liquid investigated by means of optical transmission and linear dichroism with respect to applied external magnetic field up to 100 Oe. Magnetic fluid of around 7 pH value were prepared by using magnetic nanoparticles synthesized by the co-precipitation method, surfactant and carrier liquid. Also, polarization dependent maximum transmission difference was measured as 40% for polarization parallel and 20% for polarization perpendicular to the applied field in the case of magnetic field perpendicular to the optical path. Maximum transmission change of %10 was obtained when the applied magnetic field parallel to the optical path.
在本研究中,采用光学传输和线性二色性的方法研究了制备的磁性液体在100 Oe外磁场作用下的光学特性。采用共沉淀法合成的磁性纳米颗粒、表面活性剂和载体液制备了pH约为7的磁性流体。在磁场垂直于光路的情况下,偏振相关的最大透射差在偏振平行的情况下为40%,在垂直于外加磁场的情况下为20%。当施加与光路平行的磁场时,透射率变化最大,为%10。
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引用次数: 1
Influence of roughness of the substrate on the structure and mechanical properties of TiAlN nanocoating condensed by DCMS 基体粗糙度对DCMS凝聚TiAlN纳米涂层组织和力学性能的影响
K. Dyadyura, T. Hovorun, O. Pylypenko, M. V. Hovorun, V. Pererva
Results of scientific researches show the trend of active using nitrides and borides of transition metals and their combination in developing protective materials. While single elements nitrides have been well studied, their multilayer modifications and combinations require more detailed study. Physical-mechanical properties and structural-phase state of multilayer nanocoating according to the deposition conditions is an important task for the study. A thin coating of TiAlN was deposited on R6M5 high-speed steel using an curent magnetron sputtering (DCMS) process. The microstructure and mechanical properties of deposited TiAlN films were investigated. It was shown that the morphology of the TiAlN coating mainly depends on the morphology of the substrate surface and the growth parameters of the coating.
科学研究结果表明,积极利用过渡金属氮化物和硼化物及其组合开发防护材料是一种趋势。虽然单元素氮化物已经得到了很好的研究,但它们的多层修饰和组合需要更详细的研究。根据沉积条件研究多层纳米涂层的物理力学性能和结构相状态是研究的重要课题。采用电流磁控溅射(DCMS)工艺在R6M5高速钢表面沉积了一层TiAlN薄膜。研究了沉积TiAlN薄膜的显微组织和力学性能。结果表明,TiAlN涂层的形貌主要取决于基体表面的形貌和涂层的生长参数。
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引用次数: 6
Synthesis and analysis of iron-dopped CNT/PU composites for microwave applications 微波用掺铁CNT/PU复合材料的合成与分析
M. Hussein, I. J. Rajmohan, Q. Clément, N. Vukadinovic, Y. Haik
Polyurethane (PU) matrix reinforced with carbon nanofillers forms a nanocomposite, which in addition helps to attain unique material properties by the use of the extreme high aspect ratio and nanoscopic dimensions of the nanofillers. Multi-walled carbon nanotubes (MWCNTs) are used as the nanofillers with weight percentage (wt%) ranging from 1% to 10%. The electromagnetic properties of the nanocomposites are then extracted and these show that the novel nanocomposite is a potential candidate for various microwave applications. MWCNT functionalized with Iron (Fe3O4) is used to prepare CNT/PU nanocomposites in three distinct concentrations, with lower weight percentage of 5% Fe3O4 and higher weight percentage of 20 % Fe3O4. The effect of Fe3O4 on the electrical conductivity is then analyzed and the results show the undesirable oxidization effect of Fe3O4, which significantly reduced the electrical conductivity of the composites. The oxidization effect is verified by comparing the performance of CNT-Fe3O4/PU composites with Fe3O4 powder/PU composites.
用碳纳米填充物增强聚氨酯(PU)基体形成纳米复合材料,此外,利用纳米填充物的极高纵横比和纳米尺寸,有助于获得独特的材料性能。采用多壁碳纳米管(MWCNTs)作为纳米填料,重量百分比(wt%)在1% ~ 10%之间。然后提取了纳米复合材料的电磁特性,这些表明新型纳米复合材料是各种微波应用的潜在候选材料。用Fe3O4功能化的MWCNT制备了三种不同浓度的CNT/PU纳米复合材料,其中Fe3O4的质量分数较低,为5%,Fe3O4的质量分数较高,为20%。分析了Fe3O4对复合材料电导率的影响,结果表明Fe3O4存在不良的氧化作用,显著降低了复合材料的电导率。通过比较CNT-Fe3O4/PU复合材料与Fe3O4粉末/PU复合材料的性能,验证了氧化效果。
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引用次数: 1
Peculiarities of constant magnetic field effect on the nanostructural organization and properties of hard-to-weld polyethylene-polypropylene joints 恒磁场效应对难焊聚乙烯-聚丙烯接头纳米结构组织和性能的影响
V. Demchenko, M. Iurzhenko
Using WAXS and SAXS methods it was founded that constant magnetic field effect on the melt of polymers (i.e. on the polymers in viscous-flow status, where the structure elements have the maximum mobility) causes formation of oriented welded joint structure with the axle coincides with the magnetic field effect direction. This effect causes improvement of operation properties of the welds due to the orientation of magnet-anisotropic macromolecules and aggregates in the polymer melts. Basing on the mechanical tests results it was founded that tensile strength of PE-80/PP-80 joint welded under the effect of constant magnetic field (acting transversally to the welding axle) is 12 MPa, and of welded without magnetic field effect is 6 MPa.
利用WAXS和SAXS方法发现,恒定的磁场作用于聚合物熔体(即在聚合物处于粘流状态时,结构元件具有最大的迁移率),会形成轴与磁场作用方向重合的定向焊接接头结构。由于聚合物熔体中磁性各向异性大分子和聚集体的取向,这种效应导致了焊缝操作性能的改善。根据力学试验结果,确定了PE-80/PP-80接头在恒定磁场作用下(横向作用于焊接轴)焊接的抗拉强度为12 MPa,无磁场作用焊接的抗拉强度为6 MPa。
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引用次数: 0
Optical sensors based on electrochromic conducting polymers 基于电致变色导电聚合物的光学传感器
Mindaugas Gicevicius, A. Ramanavičienė, L. Mikoliūnaitė, A. Ramanavičius
Conducting polymers have been widely applied in various sensing platforms. The application of conducting polymers in optical sensing systems is shortly overviewed and discussed in this paper. Some studies on pH, halide anions, heavy metal ions and gas sensors are presented along with their sensing characteristics and possible fields of application. Interactions that lead to a change in optical properties of conducting polymers and production of analytical signal for different analytes are explained briefly.
导电聚合物已广泛应用于各种传感平台。本文对导电聚合物在光学传感系统中的应用作了简要的综述和讨论。介绍了pH、卤化物阴离子、重金属离子和气体传感器的一些研究进展,以及它们的传感特性和可能的应用领域。简要解释了导致导电聚合物光学性质变化和不同分析物产生分析信号的相互作用。
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引用次数: 1
Clusters and boundaries in chalcogenide amorphous films 硫系非晶薄膜中的团簇和边界
V. Lykah, N. Dyakonenko, A. V. Sinelnik, V. Bilozertseva, I. A. Korzh
The results of experimental and theoretical investigation of thin chalcogenide films are presented. Transmission electron microscopy demonstrated amorphous cluster structure at nanostructure level. The order parameters (bond angle and interatomic distance) are introduced. Cluster boundaries in terms of the order parameters have been obtained and analyzed.
本文介绍了硫族化合物薄膜的实验和理论研究结果。透射电镜显示纳米级的非晶团簇结构。引入了键角和原子间距离等序参量。得到并分析了基于序参量的聚类边界。
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引用次数: 0
Wetting of nickel films of variable thickness by island lead condensates 岛状铅凝析液对变厚度镍膜的润湿作用
S. Dukarov, V. P. Pojda, I. Churilov
The wetting of nickel films deposited on NaCl (100), Si (111), and GaAs (111) single crystals by island lead condensates has been studied. It has been shown that with an increase of the Ni film thickness the contact angle changes from the value corresponding to the wetting of a clean single-crystal substrate to the wetting of the bulk nickel one. Complete substrates properties damping was achieved at nickel thicknesses of about 40, 90 and 20 nm for NaCl, Si, and GaAs, respectively. The contact angle θ change has been explained by the heterogeneity of the wettable surface. It seems to be that such heterogeneity is a result of both: the chemical interaction of the nickel film with silicon and gallium arsenide, and the nickel dissolution in liquid lead.
研究了岛铅凝析液在NaCl(100)、Si(111)和GaAs(111)单晶上沉积镍膜的润湿性。结果表明,随着Ni膜厚度的增加,接触角从对应于清洁单晶衬底润湿的值转变为对应于大块镍衬底润湿的值。对于NaCl、Si和GaAs,在镍厚度分别约为40、90和20 nm时,衬底性能得到了完全的阻尼。接触角θ的变化可以用可湿表面的非均质性来解释。这种不均匀性似乎是两方面的结果:镍膜与硅和砷化镓的化学相互作用,以及镍在液态铅中的溶解。
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引用次数: 1
Structure and properties of nanoscale MoN/CrN multilayered coatings 纳米MoN/CrN多层涂层的结构与性能
M. Lisovenko, O. Bondar, M. Opielak, V. Beresnev, P. Konarski, R. Sakenova, S. Konstantinov, F. Komarov
Multilayered nanostructured coatings consisting of MoN and CrN alternating layers have been considered. The coatings obtained by arc-vacuum deposition in 3 series with different bias potential. The thickness of bilayers has been varied from micro (1.73 μm) to nanosizes (36÷41 nm). Parameters of deposition have been changed, such as bias potential from −20 V to −300 V and chamber pressure from 7×10−4 to 3×10−3 Torr. An element and structural analysis performed with XRD, SEM (with EDS), RBS, SIMS methods has shown well properties of obtained coatings, with clearly allocated layers of CrN and MoN. It is found formation of mononitride CrN and Mo2N with cubic lattice NaCl-type. Decreasing of bilayers thickness to (36÷41) nm has provided high hardness (38÷42) GPa and wear resistance. Remarkable that increasing of chamber pressure leads to increase of wear resistance.
本文研究了由MoN和CrN交替层组成的多层纳米结构涂层。采用电弧真空沉积法制备了3个系列不同偏压电位的镀层。双层膜的厚度从微米(1.73 μm)到纳米(36÷41 nm)不等。沉积参数发生了变化,如偏置电位从−20 V到−300 V,腔压从7×10−4到3×10−3 Torr。采用XRD、SEM (EDS)、RBS、SIMS等方法对镀层进行了元素分析和结构分析,结果表明所制备的涂层具有良好的性能,CrN和MoN层分布清晰,形成了立方晶格nacl型的单氮化物CrN和Mo2N。将双层层厚度降低到(36÷41) nm,具有较高的硬度(38÷42) GPa和耐磨性。值得注意的是,腔室压力的增加导致耐磨性的增加。
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引用次数: 1
期刊
2017 IEEE 7th International Conference Nanomaterials: Application & Properties (NAP)
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