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Graphene as dry adhesive interacting with semiconductor substrates 石墨烯作为干胶粘剂与半导体衬底相互作用
Jun Sun, T. Xu, Feng Xu, Xiao Xie, Litao Sun
Here we show by molecular dynamics that graphene could be utilized as dry adhesive interacting with semiconductor substrates. Various potential semiconductor substrates are introduced and present similar results. This work opens up a new prospect for the applications of graphene and would be valuable for the scientific studies of adhesion at nanoscale.
在这里,我们通过分子动力学表明石墨烯可以用作与半导体衬底相互作用的干粘合剂。介绍了各种潜在的半导体衬底,并给出了类似的结果。这项工作为石墨烯的应用开辟了新的前景,对纳米尺度粘附的科学研究具有重要价值。
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引用次数: 0
Flexible proximity key-panel 柔性接近键面板
Yuh-Chung Hu, Cheng-Tao Ho, P. Chang
This paper proposes a flexible proximity sensor fabricated by resembling print screen. The sensor unit is composed of a polyvinylidene fluoride (PVDF) layer sandwiched in between topand bottom-electrode layers which are made of conductive silver ink. The sensing mechanism bases on the pyroelectricity of the PVDF layer. The aforesaid sandwiched sensor units are sprayed simultaneously on a flexible polyimide (PI) substrate layer by layer to form a sensor key-panel. The resembling print screen process is very low-cost. The prototype demonstrates that it is sensitive to human fingers, and therefore one of its applications is becoming for a flexible non-contact proximity key-panel for the user interface of instruments or machines. It may also be applied to proximity sensing or thermal radiation sensing. The proposed flexible proximity key-panel is also suitable for massive roll-to-roll process.
本文提出了一种用仿印刷屏制作的柔性接近传感器。传感器单元由聚偏氟乙烯(PVDF)层组成,该层夹在由导电银墨水制成的上下电极层之间。该传感机制基于PVDF层的热释电特性。将上述夹在一起的传感器单元一层一层地同时喷涂在柔性聚酰亚胺(PI)基板上,形成传感器键面板。这种类似丝网印刷的工艺成本很低。原型表明,它对人的手指很敏感,因此它的应用之一是成为仪器或机器用户界面的柔性非接触式接近键面板。它也可应用于接近感测或热辐射感测。所提出的柔性接近键面板也适用于大规模卷对卷工艺。
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引用次数: 0
Dual-gate silicon carbide (SiC) lateral nanoelectromechanical switches 双栅碳化硅(SiC)横向纳米机电开关
Tina He, R. Yang, S. Rajgopal, S. Bhunia, M. Mehregany, P. Feng
We present demonstration and experimental results of four-terminal nanoscale electromechanical switches with a novel dual-gate design in a lateral configuration based on polycrystalline silicon carbide (poly-SiC) nanocantilevers. The switches operate at both room temperature and high temperature up to T 500oC in ambient air with enhanced control over the distributed electrostatic actuation force, and also enable recovery from stiction at contact. We have experimentally demonstrated multiple switching cycles of these nanomechanical switches with different actuation control schemes, and active release from stiction by exploiting a repulsive mechanism. In combination with modeling of cantilever deflection, the experiments help reveal the coupled electromechanical behavior of the device when making contact during switching operations, and suggest possible correlation between the switch degradation observed over cycles and the elastic deformation of nanocantilevers.
我们展示了一种基于多晶碳化硅(poly-SiC)纳米反杠杆的新型双栅极横向结构的四端纳米机电开关的演示和实验结果。开关可在室温和高达500oC的高温环境空气中工作,增强了对分布式静电致动力的控制,并且还可以从接触时的粘滞中恢复。我们通过实验证明了这些纳米机械开关具有不同的驱动控制方案的多个开关周期,并利用排斥机制主动释放粘性。结合悬臂挠度建模,实验有助于揭示开关操作过程中接触时器件的耦合机电行为,并提出在循环中观察到的开关退化与纳米悬臂杆的弹性变形之间可能存在的相关性。
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引用次数: 14
Fluid dynamics analysis of magnetically actuated ciliated nano/micro structures for flow mixing and propulsion applications 用于流体混合和推进应用的磁驱动纤毛纳米/微结构的流体动力学分析
Cheng-Yi Lin, Chia-Yun Chen, Y. Hu, Chia-Yuan Chen
A series of cilium-like micro structures with magnetic particles embedded were fabricated for precise flow manipulation through the magnetically driven control. A hydrodynamic analysis was performed to elucidate the underlying interaction between ciliated structures and the induced flow fields. To fabricate ciliated structures, the micromachining method together with a casting process was employed. These ciliated structures were actuated in a homogeneous magnetic field generated by an in-house magnetic coil system for various beating cycles inside a microchannel. Three representative signal waveforms were created to mimic the beating nature of cilia for different flow actuating functions, such as micromixing and micropropulsion. To investigate the flow structures of induced flow fields quantitatively, a numerical modeling method using Fluid-Structure-Interaction module was performed. In addition, a micro-particle image velocimetry (μPIV) experiment was conducted to characterize the nonreciprocal movement of ciliated structures for the quantification of hydrodynamic efficiency. By means of the presented analysis paradigms, a new flow manipulation strategy will be suggested to transport/agitate flows efficiently in microfluidics.
通过磁驱动控制,制备了一系列嵌入磁性颗粒的纤毛状微结构,实现了对流体的精确控制。为了阐明纤毛结构与诱导流场之间潜在的相互作用,进行了水动力学分析。为了制造纤毛状结构,采用了微加工和铸造相结合的方法。这些纤毛结构在由内部磁线圈系统产生的均匀磁场中被驱动,在微通道内进行各种跳动循环。创建了三个具有代表性的信号波形来模拟纤毛的跳动性质,以实现不同的流体驱动功能,如微混合和微推进。为了定量研究诱导流场的流动结构,采用流固耦合模块对诱导流场进行了数值模拟。此外,还利用微粒子图像测速(μPIV)实验表征了纤毛结构的非互反运动,从而量化了水动力效率。利用所提出的分析范式,将提出一种新的流动控制策略,以有效地输送/搅拌微流体中的流动。
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引用次数: 6
Effect of RF sputtering parameters on PZT crystal growth 射频溅射参数对PZT晶体生长的影响
Miao Yu, T. Giffney, K. Aw, Haixia Zhang
Lead zirconate titanate(PZT) due to its large polarization, large dielectric constant and good piezoelectric performance has become popular in a wide range of applications in MEMS field. The prevailing technique for PZT deposition is sol-gel method, but the stability of solution and repeated coating can't be precisely controlled. Sputtering technique is used in this work for its relatively simple fabrication process, uniform thickness. In this work, PZT films are sputtered on Pt/Ti/SiO2/Si substrate prior to annealing. PZT preferential orientation is highly depend on the sputtering parameters. X-ray diffraction(XRD) analysis has been performed to compare the crystal growth. TiO2 seed layer is also introduced in this work.
锆钛酸铅(PZT)由于具有大极化、大介电常数和良好的压电性能,在MEMS领域得到了广泛的应用。溶胶-凝胶法是沉积PZT的主流技术,但溶液的稳定性和重复镀膜不能精确控制。采用溅射技术制作工艺简单,厚度均匀。在这项工作中,PZT薄膜在退火前溅射在Pt/Ti/SiO2/Si衬底上。PZT的择优取向高度依赖于溅射参数。用x射线衍射(XRD)分析了晶体的生长情况。本文还引入了TiO2种子层。
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引用次数: 2
Label-free separation and sorting of human monocytes and T-cells by electrowetting and dielectrophoresis 人单核细胞和t细胞的电润湿和介质电泳无标记分离和分选
Cheng-Yeh Huang, M. Chiang, S. Fan, A. Ghaemmaghami, W. Hsu
We report a label-free separation and sorting approach based on electrowetting-on-dielectric (EWOD) and dielectrophoresis (DEP) to manipulate human monocyte (THP-1) and T-cell (Jurkat) lines in droplets without any impact on cell viability. In addition to separating cells, this device provides a platform to study cell-cell interactions and migration before the separation.
我们报道了一种基于电介质上电润湿(EWOD)和介电电泳(DEP)的无标记分离和分选方法,可以在液滴中操纵人类单核细胞(THP-1)和t细胞(Jurkat)系,而不影响细胞活力。除了分离细胞外,该装置还提供了一个平台来研究分离前细胞间的相互作用和迁移。
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引用次数: 1
Low frequency vibration energy harvesting from human motion using IPMC cantilever with electromagnectic transduction 利用带电磁转导的IPMC悬臂梁收集人体运动中的低频振动能量
K. Aw, Siva V. Praneeth
This research aims as a proof of concept for a vibration energy harvester using human motion as the energy source. Human motion consists of burst of low frequency vibrational kinetic energy. The high acceleration burst is usually 1. 5 to 2 g when the foot strikes the ground and an ionic polymer metallic composite (IPMC) can be used to harvest this energy via two methods. The first method is via the bending of the IPMC causing the mobile cations to move and produces an output voltage pulse, hence capacitive transduction. Secondly, the IPMC in a beam form that resonate at the low vibration frequency due to its relatively low Young's modulus can scavenge additional secondary energy via external electromagnetic transduction to supplement the primary harvested energy via the IPMC capacitive transduction.
本研究旨在验证利用人体运动作为能量来源的振动能量采集器的概念。人体运动是由低频振动动能的爆发构成的。高加速度爆发通常为1。当脚着地时产生5到2克的能量,离子聚合物金属复合材料(IPMC)可以通过两种方法来收集这种能量。第一种方法是通过IPMC的弯曲导致移动阳离子移动并产生输出电压脉冲,因此是电容转导。其次,由于其相对较低的杨氏模量,波束形式的IPMC在低振动频率下产生共振,可以通过外部电磁转导清除额外的二次能量,以补充通过IPMC电容转导收集的一次能量。
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引用次数: 4
Fabrication of copper nanowires by eelectrodeposition uusing anodic aluminum oxide template 阳极氧化铝模板电沉积制备铜纳米线
C. Chung, C. Yang, M. Liao, S. Li
In this paper, effects of potential and output mode on copper nanowire arrays via porous anodic aluminum oxide template by electrochemical deposition method have been investigated. The copper nanowire arrays were fabricated using electrochemical deposition in 0.2 M CuSO4 by different potential modes including direct current (DC) and pulse. The nanostructure, morphology, chemical composition and phase of copper nanowire arrays were examined by scanning electron microscopy and grazing incidence X-ray diffraction. The results indicated that the copper nanowire arrays deposited by pulse mode revealed high aspect ratio despite high potential while that at higher DC potential was rather short due to the hydrogen generation in reduction reaction. The short duty cycle of 50% in pulse deposition can release the produced hydrogen for good nanowires formation.
本文采用电化学沉积方法,研究了电位和输出模式对多孔阳极氧化铝模板上铜纳米线阵列的影响。以0.2 M CuSO4为基体,采用直流和脉冲两种电位模式制备了铜纳米线阵列。采用扫描电镜和掠入射x射线衍射对铜纳米线阵列的纳米结构、形貌、化学成分和物相进行了表征。结果表明,脉冲方式沉积的铜纳米线阵列在高电位下呈现出较高的纵横比,而在高直流电位下,由于还原反应产生氢,纵横比较短。脉冲沉积的占空比较短,为50%,可以释放产生的氢,形成良好的纳米线。
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引用次数: 0
Quantitative characterization of specific targeting of tumor cells by antibody-functionalized particles 抗体功能化颗粒特异性靶向肿瘤细胞的定量表征
M. T. Stamm, Andrew S. Trickey-Glassman, Linan Jiang, Y. Zohar
Receptor-ligand binding has been one of the more popular approaches to specifically targeting tumor cells. In this work, targeting efficiency was quantitatively characterized using silica particles functionalized with EpCAM antibodies and EpCAM-expressing BT-20 breast cancer cells. The effects of incubation time and particle concentration on the number of functionalized particles bound to target cells were experimentally investigated. The number of bound particles was found to increase with particle concentration, but not necessarily with incubation time. While particle desorption and cellular loss of binding affinity in time seem to be negligible, cell-particle-cell interaction was identified as the limiting mechanism for the number of particles bound to target cells. The current findings suggest that separation of a bound particle from a cell may be detrimental to cellular binding affinity.
受体-配体结合是目前比较流行的靶向肿瘤细胞的方法之一。在这项工作中,利用EpCAM抗体功能化的二氧化硅颗粒和表达EpCAM的BT-20乳腺癌细胞,定量表征了靶向效率。实验研究了孵育时间和颗粒浓度对结合靶细胞的功能化颗粒数量的影响。结合颗粒的数量随颗粒浓度的增加而增加,但与孵育时间无关。虽然颗粒解吸和细胞在时间上的结合亲和力损失似乎可以忽略不计,但细胞-颗粒-细胞相互作用被认为是结合靶细胞的颗粒数量的限制机制。目前的研究结果表明,结合颗粒从细胞中分离可能对细胞结合亲和力有害。
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引用次数: 2
Polymeric hemispherical pico-liter micro cups fabricated by inkjet printing 用喷墨印刷制造的聚合物半球形微杯
L. Jacot-Descombes, M. Gullo, V. Cadarso, M. Mastrangeli, J. Brugger
The fabrication of precise hemispherical shape is challenging with standard planar lithography techniques. A suitable alternative is the fabrication by inkjet printing. This paper presents a method based on drop-on-demand inkjet printing on pre-patterned silicon substrates allowing the controlled fabrication of SU-8 hemispherical cup-like structures with inner cavities of sub-nano-liter volumes. Examples are given for cups of 100μm in diameter with inner cavity volumes of 5pL, 20pL and 45pL. Arrays of 360 hemispherical SU-8 cups have been fabricated with a yield above 96%. The 4% of exceptions are also described and shown as a method for achieving almost complete SU-8 spheres.
用标准平面光刻技术制造精确的半球形是具有挑战性的。一种合适的替代方法是通过喷墨印刷制造。本文提出了一种在预图型硅衬底上按需喷墨打印的方法,可以控制制造具有亚纳升体积内腔的SU-8半球形杯状结构。给出了直径为100μm、内腔体积为5pL、20pL和45pL的杯子的例子。已制成360个半球形的SU-8杯阵列,产率在96%以上。4%的例外也被描述并显示为实现几乎完整的SU-8球体的方法。
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引用次数: 2
期刊
The 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems
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