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2012 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO)最新文献

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Compressive and tensile behaviors of carbon and boron nitride nanotubes 碳和氮化硼纳米管的压缩和拉伸行为
R. Wei, Yanling Tian, V. Eichhorn, S. Fatikow
In order to systematically investigate compressive and tensile behaviors of the carbon nanotubes and boron nitride nanotubes, classical molecular dynamics simulations are conducted to examine the deformation patterns under compression and tension. The axial stress and strain energy per atom are obtained to study the mechanical properties of the nanotubes. From the computational analyses, it is noted that chirality is one of the main factors affecting the behavior of the nanotubes, and the nanotubes in different materials but with the same chirality have similar deformation patterns. The axial stress and strain energy per atom can also reflect the behavior of the tubes.
为了系统地研究碳纳米管和氮化硼纳米管的压缩和拉伸行为,进行了经典的分子动力学模拟,研究了压缩和拉伸作用下的变形模式。得到了纳米管的轴向应力和单原子应变能,研究了纳米管的力学性能。计算分析表明,手性是影响纳米管行为的主要因素之一,具有相同手性的不同材料的纳米管具有相似的变形模式。轴向应力和每个原子的应变能也能反映管材的性能。
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引用次数: 3
Measuring low concentrations of fluorescent magnetic nanoparticles by fluorescence microscopy 用荧光显微镜测量低浓度的荧光磁性纳米颗粒
Zhaolong Shen, K. Chen, B. Shapiro
We introduce a new method called particle image counting (PIC) to quantify low concentrations of fluorescent magnetic nanoparticles in liquid biological samples. The biological sample is diluted with gelatin and a known volume is placed on a microscope slide. The magnetic particles are pulled down to one surface of the slide by a magnet held on the opposing surface before the gelatin is solidified to immobilize the particles. After imaging with fluorescence microscopy, the number of particles is counted using a vision algorithm. This provides an accurate measurement of particle concentration in the original biological sample. Here the method is validated by a series of experimental measurements of dilutions of a solution with a known number of fluorescent magnetic nanoparticles.
我们介绍了一种称为粒子图像计数(PIC)的新方法来定量液体生物样品中低浓度的荧光磁性纳米颗粒。生物样品用明胶稀释,已知体积放在显微镜载玻片上。在明胶固化以固定颗粒之前,磁性颗粒被固定在相对表面的磁铁拉到幻灯片的一个表面。在用荧光显微镜成像后,使用视觉算法计算粒子的数量。这提供了原始生物样品中颗粒浓度的精确测量。这里的方法是通过一系列的实验测量稀释的溶液与已知数量的荧光磁性纳米粒子的验证。
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引用次数: 5
New synthesis method of sword-sheath structured carbon nanotubes 剑鞘结构碳纳米管合成新方法
Xuecheng Chen, K. Kierzek, R. Kaleńczuk, E. Mijowska, Zhiwei Jiang, Tao Tang
Here, we report a facile method to synthesize a novel material-mesoporous carbon nanowires trapped in carbon nanotubes forming sword-sheath structures (MCW@CNT). They are fabricated by combining surfactant-templating self-assembly method and chemical vapor deposition in AAO template. Both of the sword and the sheath are formed by graphitic layers analogous to multiwalled carbon nanotubes. The formation of this sword-sheath structure resulted in the enhancement of specific surface area. Uniform SnO2 nanoparticles were deposited in the inner space of carbon nanotubes. The electrochemical properties of the SnO2-MCW@CNTs composites as anode materials for lithium batteries were investigated.
在这里,我们报告了一种简单的方法来合成一种新型材料-被困在碳纳米管中的介孔碳纳米线形成剑鞘结构(MCW@CNT)。采用表面活性剂-模板自组装和化学气相沉积相结合的方法在AAO模板上制备了它们。剑和鞘都是由类似于多壁碳纳米管的石墨层构成的。这种剑鞘结构的形成导致了比表面积的增强。在碳纳米管的内部空间沉积了均匀的SnO2纳米颗粒。研究了SnO2-MCW@CNTs复合材料作为锂电池负极材料的电化学性能。
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引用次数: 0
Self-assembled layers of colloidal crystals submicron spheres for photonic applications 用于光子应用的胶体晶体亚微米球体自组装层
E. Cabrera, S. Portal, E. Pascual, Enric Bertran
The use of large nanopatterned surfaces areas arouses a growing interest for the fabrication of templates, thin membranes, biomedical sensors and large-area photonic devices. Langmuir-Blodgett (LB) technique offers the possibility to deposit self-assembled monolayers of molecules and nanometric particles on surfaces exhibiting a structural order and uniformity at large scale. In this work, we studied the characteristics and properties of silica nanoparticles, produced by sol-gel process, for self-assembly in close-packed 2D crystal monolayers, deposited on glass and silicon substrates using the LB technique. The resulting monolayers were characterized by SEM (Scanning Electron Microscopy), AFM (Atomic Force Microscopy), optical measurements, transmittance and contact angle measurements.
利用大面积的纳米图案表面引起了人们对模板、薄膜、生物医学传感器和大面积光子器件制造的兴趣。Langmuir-Blodgett (LB)技术提供了将分子和纳米粒子自组装单层沉积在具有大规模结构秩序和均匀性的表面上的可能性。在这项工作中,我们研究了溶胶-凝胶法制备的二氧化硅纳米颗粒的特性和性质,并利用LB技术在玻璃和硅衬底上自组装成紧密排列的二维晶体单层。通过扫描电子显微镜(SEM)、原子力显微镜(AFM)、光学测量、透射率和接触角测量对所得单层膜进行了表征。
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引用次数: 3
Highly flexible micro-joint with large rotational movement based on elastic design concept 基于弹性设计理念的大旋转运动高柔性微关节
C. Ha, Y. Son, Sungseek Ham, Dong-Yol Yang
As nano/micro devices become smaller, it is important to manipulate them with highly accurate control. The design of micro-joints is important for highly accurate movement. An elastic joint, one of type of micro-joint that is commonly used for rotational movement, however, has a limitation in terms of its small rotational range. This paper discusses a new micro-joint based on an elastic design concept for large rotational movement. The proposed micro-joint was designed with a simple shape of two thin plates. For large rotational movement with small force, a modified micro-joint with a helical structure was proposed. Through numerical simulation, the proposed micro-joint is estimated to have a large rotation that can be obtained with only a small force.
随着纳米/微器件的小型化,对其进行高精度控制变得尤为重要。微关节的设计是实现高精度运动的关键。弹性关节是一种常用的用于旋转运动的微关节,但其旋转范围小,存在一定的局限性。本文讨论了一种基于弹性设计思想的大型旋转运动微关节。所提出的微关节被设计成两个薄板的简单形状。针对大的旋转运动和小的作用力,提出了一种改进的螺旋结构微关节。通过数值模拟,估计所提出的微关节仅用较小的力即可获得较大的旋转。
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引用次数: 1
Nano scale dynamic track control in multidimensional space 多维空间纳米尺度动态轨迹控制
Yong-min Jiang
According to the experimental and theoretical derivation, we present the first study of the CNC machine tool control theory based on the relation between geometry and motion. By studying the trajectory characteristics in both multidimensional space and time space, the displacement and its derivatives are designed as a motion vector space. With this vector space, the relationship among geometric parameters, dynamic parameters, function and its derivatives, can be studied all together. They can also be studied respectively according to its geometric and physical meanings. The time-derivative can increase the middle variables as a reference time for the control technology process. If the variation ratio of real time to reference time is known or measurable, the trajectory differential equation can be completely solved. We put forward a new method: to control the track realization process is the way to control the trajectory movement parameter. Through experiment and simulation, it has been proven that this method can realize geometry and integrated control, reduce motion trajectory calculation, and while improving precision, it increases path planning adaptability to the environment. It is therefore a good method to control tracks for machine tools.
在实验和理论推导的基础上,首次提出了基于几何与运动关系的数控机床控制理论。通过研究在多维空间和时间空间中的轨迹特征,将位移及其导数设计为一个运动向量空间。有了这个向量空间,就可以综合研究几何参数、动态参数、函数及其导数之间的关系。也可以根据其几何意义和物理意义分别进行研究。时间导数可以增加中间变量作为控制工艺过程的参考时间。如果实时时间与参考时间的变化率已知或可测量,则可以完全求解轨迹微分方程。提出了一种新的控制轨迹实现过程的方法,即控制轨迹运动参数的方法。通过实验和仿真,证明该方法能够实现几何化和一体化控制,减少运动轨迹计算,在提高精度的同时,增加了路径规划对环境的适应性。因此,对机床进行轨迹控制是一种很好的方法。
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引用次数: 0
Effect of liquids on AFM imaging 液体对原子力显微镜成像的影响
Yang Liu, Zuobin Wang, Yingmin Qu, Y. Lei, Yanqin Peng, P. Zhang, Jinyun Liu, Wei-Yan Jiang, Yandong Bai
AFM (atomic force microscope) imaging in liquids is very important in measurement science for bio-applications. This paper discusses the effect of liquids on AFM imaging. In a developed AFM system, a standard 2D grating was used for the study of AFM imaging in different liquids including deionzed water, DMEM (Dulbecco's Modified Eagle Medium) and DMEM with 10% of FBS (Fetal Bovine Serum). AFM images acquired from different liquids were analyzed in terms of the image contrast and standard deviation of the grating period by Matlab. The experimental results have shown clearly the different effects of liquids on AFM imaging. The AFM imaging quality in liquids is a function of different forces acting on the cantilever and is directly related to the physical properties of the liquids.
液体原子力显微镜(AFM)成像在生物测量科学中有着重要的应用。讨论了液体对原子力显微镜成像的影响。在开发的AFM系统中,使用标准二维光栅研究AFM在不同液体中的成像,包括去离子水、DMEM (Dulbecco's Modified Eagle Medium)和DMEM(含10%胎牛血清)。利用Matlab软件对不同液体获得的AFM图像进行对比度和光栅周期标准差分析。实验结果清楚地显示了液体对原子力显微镜成像的不同影响。液体中的AFM成像质量是作用在悬臂上的不同力的函数,并且与液体的物理性质直接相关。
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引用次数: 1
Selective growth of Ca2Si film or Ca5Si3 film in Ca-Si system by R.F MS by annealing 用射频谱法在Ca-Si体系中选择性生长Ca2Si膜或Ca5Si3膜
Cheng Jun, Liang Yi, Yang Yinye, X. Quan, Zhang Jinmin
Ca films were deposited directly on Si(100) substrates by Radio Frequency (R.F.) magnetron sputtering system (MS) and subsequent were pre-annealed at 600 °C for 2h in situ. Finally, the samples were annealed again at 750°C, 782°C, 795°C, 800°C and 850°C for 1h in a vacuum furnace by an interdiffusion process between the deposited particles and clusters and Si atoms, respectively. The structural and morphological features of the resultant films were tested by XRD, SEM, EDAX and FT-IR. The cubic phase Ca2Si film and the tetragonal phase Ca5Si3 film were grown directly and individually on Si(100) substrates, respectively. The experimental results indicate that the selective growth of a single phase Ca-silicide in Ca-Si system in the existence of multiple silicide phases depends on sputtering condition and annealing in twice. In addition, the electronic structure of stressed the cubic phase Ca2Si was calculated using the first-principle methods based on plane-wave pseudo-potential theory.
采用射频(rf)磁控溅射系统(MS)直接在Si(100)衬底上沉积Ca薄膜,然后在600℃下原位预退火2h。最后,将样品在真空炉中分别于750℃、782℃、795℃、800℃和850℃退火1h,使沉积的颗粒和团簇与Si原子相互扩散。采用XRD、SEM、EDAX和FT-IR等手段对膜的结构和形貌进行了表征。在Si(100)衬底上分别生长立方相Ca2Si薄膜和四方相Ca5Si3薄膜。实验结果表明,在存在多相硅化物的Ca-Si体系中,单相ca -硅化物的选择性生长取决于溅射条件和两次退火。此外,采用基于平面波伪势理论的第一性原理方法计算了受压立方相Ca2Si的电子结构。
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引用次数: 0
Characterization by magnetophoresis of therapeutic microcarriers relying on embedded nanoparticles to allow navigation in the vascular network 通过磁电泳表征治疗微载体依赖于嵌入的纳米颗粒,以允许在血管网络中导航
G. Vidal, S. Martel
In this paper a magnetophoretic chamber design is presented as a tool to evaluate the deflection patterns of magnetic microcarriers compatible with Magnetic Resonance Navigation (MRN) for drug delivery applications. Such micro-entities with different magnetic characteristics and subject to the force of a fluid flow show different deflection patterns while the effects of aggregations under different fluid flow velocities are critical to estimate the most adequate MRN strategy. Preliminary results indicate that the system and the corresponding methods presented here could become a practical tool to characterize the magnetophoretic behaviors of such microcarriers intended for navigation in the vascular network.
本文提出了一种磁电泳室设计,作为一种工具来评估与磁共振导航(MRN)兼容的磁微载体的偏转模式,用于药物递送应用。这些微实体具有不同的磁性特征并受到流体流动力的影响,表现出不同的偏转模式,而不同流体流动速度下的聚集效应对于估计最合适的MRN策略至关重要。初步结果表明,本文提出的系统和相应的方法可以成为表征这种用于血管网络导航的微载体的磁泳行为的实用工具。
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引用次数: 3
Effect of magnetic field on microstructure of carbon nanotube reinforced Mg matrix composites 磁场对碳纳米管增强Mg基复合材料微观结构的影响
Liang Junhao, Li Hejun, Cheng Sanxu, W. Jianfeng, Qi Lehua
CNTs have been used as reinforcements due to its excellent mechanical properties. However, the effect of magnetic field on the microstructure of Mg composites reinforced with nano-magnetic particles has not been well understood. For this reason, Mg matrix nanocomposites containing 0.5 wt.% CNTs coated with Fe3O4 was fabricated using stirring casting method by applying a unilateral magnetic field and the microstructure of the composites was investigated. The magnetic field is effective for the movement of CNTs coated with Fe3O4 in molten Magnesium alloy. More shrinkage cavities were found in the region closed to the magnetic source. Meanwhile, the magnetic response of CNTs coated with Fe3O4 in liquid magnesium alloy was validated.
CNTs由于其优异的力学性能而被用作增强材料。然而,磁场对纳米磁性颗粒增强Mg复合材料微观结构的影响尚不清楚。为此,采用单向磁场搅拌铸造法制备了含0.5 wt.% CNTs的Fe3O4纳米复合材料,并对复合材料的微观组织进行了研究。磁场对Fe3O4包覆的碳纳米管在镁合金液中的运动是有效的。在靠近磁源的区域发现了更多的缩孔。同时,验证了Fe3O4包覆CNTs在液态镁合金中的磁响应。
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引用次数: 0
期刊
2012 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO)
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