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2018 IEEE Micro Electro Mechanical Systems (MEMS)最新文献

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Droplet microfluidics inside paper 纸内微流体液滴
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346536
H. Yasuga, Weijin Guo, J. Hansson, T. Haraldsson, N. Miki, Wouter van der Wijngaart
Here, we demonstrate, for the first time: the self-digitization, i.e. spontaneous formation, of microdroplets during the imbibition of paper; the on-demand merging of individual microdroplets in paper; and the on-demand ejection of individual microdroplets from the paper. Two technical novelties underlie these novel functions: the formation of free-standing synthetic microfluidic paper, i.e. a porous matrix of slanted and interconnected micropillars without bottom layer; and the hydrophobic surface modification of the paper. The ease of manipulation and the direct access to the microdroplets from the environment makes this an extremely versatile tool, with potential applications in liquid sample digitisation and microparticle generation.
在这里,我们首次证明了微滴在纸的吸胀过程中的自我数字化,即自发形成;单个微滴在纸上的按需合并;以及从纸上按需喷射出单个微滴。两项技术创新奠定了这些新功能的基础:形成独立的合成微流控纸,即由倾斜且相互连接的微柱组成的多孔基质,没有底层;并对纸张进行疏水表面改性。易于操作和直接从环境中获取微滴使其成为一种非常通用的工具,在液体样品数字化和微粒生成方面具有潜在的应用。
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引用次数: 4
Fabrication of C-doped WO3 nanoamterial-based gas sensors for highly sensitive NO2 detection at room temperature 室温下高灵敏度NO2检测用掺杂c - WO3纳米材料气体传感器的制备
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346710
D. Baek, S. Pyo, Jongbaeg Kim
This paper firstly reports a method to fabricate C-doped tungsten oxide (WO3) nanomaterials using carbon nanotubes (CNTs) template and demonstrates its application to highly sensitive NO2 gas sensing at room temperature. The W-coating on the CNTs template is performed by a simple solution process, and the C-doped WO3 nanomaterials are synthesized through an annealing process while the CNTs are removed simultaneously. The synthesized C-doped WO3 has a shape like the CNTs, which indicates that the material has a large surface area favorable for sensitive gas detection. The fabricated sensor detected 6 ppm of NO2 at room temperature and returned perfectly to its original state. These sensing performance is comparable to the existing WO3-based NO2 sensors.
本文首次报道了一种利用碳纳米管(CNTs)模板制备掺杂c的氧化钨(WO3)纳米材料的方法,并演示了其在室温下高灵敏度NO2气敏中的应用。采用简单的溶液法在碳纳米管模板上进行w涂层,在去除碳纳米管的同时,通过退火工艺合成掺杂c的WO3纳米材料。合成的掺杂c的WO3具有类似CNTs的形状,这表明该材料具有较大的表面积,有利于敏感气体的检测。该传感器在室温下检测到6 ppm的NO2,并完全恢复到原始状态。这些传感性能可与现有的基于wo3的NO2传感器相媲美。
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引用次数: 0
Decoding peripheral nerve sensory information with a spiked flexible neural interface 解码周围神经感觉信息与一个尖刺灵活的神经接口
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346514
Jiahui Wang, X. Thow, Hao Wang, Sanghoon Lee, K. Voges, N. Thakor, S. Yen, Chengkuo Lee
Wearable artificial sensors are proposed as a way to capture information for restoration of sensory feedback to persons with tetraplegia. However, the ability of these artificial sensors is limited. One relatively unexplored approach is to make use of the signals from surviving tactile and proprioceptive receptors by recording from the transmitting axons. In this paper, we describe a spiked ultraflexible neural (SUN) interface, which can be implanted into the peripheral nervous system (PNS) to capture sensory information. The 3D design, which integrates spiked structures for intrafascicular nerve recording with flexible substrate, enables a conformal interface to the target nerve.
可穿戴人工传感器是一种捕获信息的方法,用于四肢瘫痪患者的感官反馈恢复。然而,这些人工传感器的能力是有限的。一种相对未被探索的方法是通过记录来自传递轴突的触觉和本体感觉受体的信号。在本文中,我们描述了一种刺状超柔性神经(SUN)接口,它可以植入周围神经系统(PNS)以捕获感觉信息。3D设计集成了用于束内神经记录的刺状结构和柔性基底,实现了与目标神经的保形界面。
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引用次数: 0
Microwell-array on a flexible needle: A transcutaneous insertable impedance sensor for label-free cytokine detection 柔性针头上的微孔阵列:用于无标记细胞因子检测的经皮可插入阻抗传感器
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346570
Naixin Song, Pengfei Xie, W. Shen, M. Javanmard, M. Allen
Measurement of various specific proteins in body fluids can be a key component of continuous health monitoring. The gold-standard technique for protein quantification is ELISA, which typically relies on labeling and optical fluorescence. Impedance sensors provide a promising alternative due to ease of miniaturization, rapid readout and label-free operation; yet lag their fluorescent counterparts in terms of sensitivity. We present a flexible micromachined needle-shaped impedance sensor for label-free in-situ detection of cytokines and other biomarkers. The sensor utilizes a micro-well array configuration at the needle tip to enable label-free detection while simultaneously maintaining the capability of high sensitivity detection, despite the high salt concentration of complex biological fluids. Real-time label-free detection is achieved in an in vitro skin phantom by monitoring the impedance change of the sensor electrodes as specific binding of target proteins to antibodies on the sensor surface occurs.
体液中各种特定蛋白质的测量是持续健康监测的关键组成部分。蛋白质定量的金标准技术是ELISA,它通常依赖于标记和光学荧光。阻抗传感器由于易于小型化,快速读出和无标签操作而提供了一个有前途的替代方案;但在灵敏度方面却落后于它们的荧光对应物。我们提出了一种灵活的微机械针状阻抗传感器,用于无标记的细胞因子和其他生物标志物的原位检测。该传感器在针尖采用微孔阵列配置,可以实现无标签检测,同时保持高灵敏度检测能力,尽管复杂生物流体的盐浓度很高。实时无标签检测是在体外皮肤幻影中实现的,通过监测传感器电极在目标蛋白与传感器表面抗体特异性结合时的阻抗变化。
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引用次数: 3
Hydrogel tip attached quartz tuning fork using elastomeric tip mold replicated from electrochemically etched tungsten wire 水凝胶尖端连接石英音叉使用弹性尖端模具复制从电化学蚀刻钨丝
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346691
Juhee Ko, Amun Jarzembski, Keunhan Park, Jungchul Lee
This paper reports the first demonstration of hydrogel atomic force microscope (AFM) tip attachment to quartz tuning forks (QTFs) by using elastomeric tip molds replicated from an electrochemically etched tungsten wire. The tungsten tip of ∼20 nm radius obtained by time-controlled electrochemical etching is replicated with h-polydimethylsiloxane (h-PDMS) to make negative conical tip molds large enough to be used for QTFs. Using the h-PDMS tip molds, a polyethyleneglycol-diacrylate (PEG-DA) tip is attached to various facets of QTFs without using an adhesive. In addition, we have shown that hydrogel tip can be regenerated multiple times to address issues associated with tip wear.
本文报道了水凝胶原子力显微镜(AFM)尖端附着在石英音叉(QTFs)上的首次演示,该技术采用由电化学蚀刻钨丝复制的弹性尖端模具。用h-聚二甲基硅氧烷(h-PDMS)复制通过时间控制电化学刻蚀获得的半径为~ 20 nm的钨尖,以制作足够大的负锥形尖模具,用于qtf。使用h-PDMS尖端模具,聚乙二醇二丙烯酸酯(PEG-DA)尖端无需使用粘合剂即可附着在qtf的各个方面。此外,我们已经证明水凝胶尖端可以多次再生,以解决与尖端磨损相关的问题。
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引用次数: 1
A silicon-based parabolic sub-THz reflector antenna for gain enhancement and near-field focus applications 一种用于增益增强和近场聚焦应用的硅基抛物面亚太赫兹反射器天线
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346678
M.-T. Hsu, Te-Yen Chiu, Sirao Wu, Y. Cheng, C.-H. Li, C. Kuo
This paper presents the first silicon-based parabolic Sub-THz reflector antenna with corresponding fabrication processes. The antenna is side fed with an on-chip 340 GHz patch antenna on a reflector made of stacked micromachined silicon substrates with a parabolic-shaped Kapton film coated with aluminum on top. The antenna with a size of 18 ×18 ×4 mm3 and an aperture of ∼10mm can be easily integrated with monolithic microwave integrated circuit sources, i.e. 40 nm CMOS triple-push oscillator in this case, and exhibit not only ∼12.4 dB directive gain enhancement and 4.34° HPBW (Half Power Beam Width) for far field radiation but also an excellent near field focus characteristic with a 28.5 mm depth of field (DOF).
本文提出了第一个基于硅的亚太赫兹抛物面反射天线,并给出了相应的制作工艺。该天线的侧馈是一个片上340 GHz贴片天线,其反射器由堆叠的微机械硅衬底和顶部涂有铝的抛物线形卡普顿薄膜制成。尺寸为18 ×18 ×4 mm3,孔径为~ 10mm的天线可以很容易地与单片微波集成电路源(即40 nm CMOS三推振荡器)集成,不仅具有~ 12.4 dB的定向增益增强和4.34°HPBW(半功率波束宽度)的远场辐射,而且具有出色的近场聚焦特性,具有28.5 mm的景深(DOF)。
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引用次数: 3
Triple-coaxial flow for continuous production of microtubes containing microbes for bioremediation 用于生物修复的含微生物微管连续生产的三同轴流
Pub Date : 2018-04-24 DOI: 10.1109/MEMSYS.2018.8346795
Kazuma Fujimoto, K. Higashi, H. Onoe, N. Miki
This paper describes a microfluidic device to continuously produce a hydrogel microtube using triple-coaxial flow. In our prior work, double-coaxial flow was used to produce hydrogel microtubes, though continuous and mass production was a challenge. In this work, we also demonstrate bioremediation using the microtubes that encapsulate microbial suspension. The microenvironment created by the microtubes enabled efficient purification of aqueous sample solution and in addition, the microbes are maintained inside the microtube and are easily collected without contaminating the solution. The proposed technology can be applied to any types of microbes and can be of great benefit for various microbial processes.
本文介绍了一种利用三同轴流连续制备水凝胶微管的微流控装置。在我们之前的工作中,双同轴流用于生产水凝胶微管,尽管连续和大规模生产是一个挑战。在这项工作中,我们还演示了使用包封微生物悬浮液的微管进行生物修复。微管创造的微环境能够有效地净化水样溶液,此外,微生物保持在微管内,很容易收集而不污染溶液。所提出的技术可以应用于任何类型的微生物,并且可以对各种微生物过程有很大的好处。
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引用次数: 0
Waferscale electrostatic quadrupole array for multiple ION beam manipulation 用于多离子束操作的晶圆级静电四极阵列
Pub Date : 2018-02-07 DOI: 10.1109/MEMSYS.2018.8346681
K. Vinayakumar, A. Persaud, Q. Ji, P. Seidl, T. Schenkel, A. Lal
We report on the first through-wafer silicon-based Electrostatic Quadrupole Array (ESQA) to focus high energy ion beams. This device is a key enabler for a wafer-based accelerator architecture that lends itself to orders-of-magnitude reduction in cost, volume and weight of charged particle accelerators. ESQs are a key building block in developing compact Multiple Electrostatic Quadrupole Array Linear Accelerator (MEQALAC) [1]. In a MEQALAC electrostatic forces are used to focus ions, and electrostatic field scaling permits high beam current densities by decreasing the beam aperture size for a given peak electric field set by breakdown limitations. Using multiple parallel beams, each totaling to an area A, can result in higher total beam current compared to a single aperture beam of the same area. Smaller dimensions also allow for higher focusing electric field gradients and therefore higher average beam current density. Here we demonstrate that Deep Reactive Ion Etching (DRIE) micromachined pillar electrodes, electrically isolated by silicon-nitride thin films enable higher performance ESQA with waferscale scalability. The fabricated ESQA are able to hold up toi kV in air. A 3×3 array of 12 keV argon ion beams are focused in a wafer accelerator unit cell to pave the way for multiple wafer accelerator.
本文报道了首个可聚焦高能离子束的硅基静电四极阵(ESQA)。该器件是基于晶圆的加速器架构的关键推动者,它使带电粒子加速器的成本、体积和重量大大降低。esq是开发紧凑型多重静电四极阵列直线加速器(MEQALAC)的关键组成部分[1]。在MEQALAC中,静电力用于离子聚焦,静电场缩放通过减小由击穿限制设定的给定峰值电场的光束孔径大小来允许高光束电流密度。使用多个平行光束,每个光束总计到一个区域A,与相同区域的单孔径光束相比,可以产生更高的总光束电流。更小的尺寸也允许更高的聚焦电场梯度,因此更高的平均光束电流密度。在这里,我们证明了深度反应离子蚀刻(DRIE)微机械柱电极,由氮化硅薄膜电隔离,可以实现更高性能的ESQA,具有晶圆级的可扩展性。制造的ESQA能够在空气中承受1kv的压力。在晶圆加速器单元电池中聚焦了一个3×3阵列的12kev氩离子束,为多晶圆加速器铺平了道路。
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引用次数: 2
Fully integrated mass flow, pressure, density and viscosity sensor for both liquids and gases 完全集成的质量流量,压力,密度和粘度传感器的液体和气体
Pub Date : 2018-01-25 DOI: 10.1109/MEMSYS.2018.8346523
T. Schut, D. Alveringh, W. Sparreboom, J. Groenesteijn, R. Wiegerink, J. C. Lotters
This paper reports on a fluid viscosity sensor consisting of pressure sensors fully integrated with a Coriolis mass flow sensor. The sensor is capable of measuring viscosities of both liquids and gases through a mathematical model. For liquids, this model is simply the Hagen-Poiseuille equation. For gases, a more elaborate model is derived, taking into account compressibility and additional pressure losses due to channel geometry. Viscosities of (mixtures of) water and isopropanol were measured and correspond well with values found in literature. Viscosities of nitrogen and argon were measured with accuracies of −0–12%, depending on input pressure and mass flow rate. Improvement of the mathematical model could lead to higher accuracy and less dependence on mass flow or pressure.
本文报道了一种由压力传感器与科氏质量流量传感器完全集成而成的流体粘度传感器。该传感器能够通过数学模型测量液体和气体的粘度。对于液体,这个模型就是简单的Hagen-Poiseuille方程。对于气体,考虑到可压缩性和由于通道几何形状造成的额外压力损失,导出了一个更精细的模型。测量了水和异丙醇(混合物)的粘度,并与文献中发现的值很好地对应。根据输入压力和质量流量的不同,氮气和氩气的粘度测量精度为- 0-12%。改进数学模型可以提高精度,减少对质量流量或压力的依赖。
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引用次数: 6
A mode-localized MEMS accelerometer with 7μg bias stability 具有7μg偏置稳定性的模式局域MEMS加速度计
Pub Date : 2018-01-25 DOI: 10.1109/MEMSYS.2018.8346719
Milind S. Pandit, Chun Zhao, G. Sobreviela, Arif Mustafazade, X. Zou, A. Seshia
This paper reports on the experimental characterization of the resolution, sensitivity and common mode rejection metrics for a mode-localized MEMS accelerometer. A bias stability of 7μg is achieved for closed-loop amplitude ratio measurements at an integration time of 30s representing a significant advancement in the development of high-stability accelerometers employing this transduction principle.
本文报道了一种模式局域化MEMS加速度计的分辨率、灵敏度和共模抑制指标的实验表征。在30秒的积分时间内,闭环振幅比测量获得了7μg的偏置稳定性,这代表了采用该转导原理开发高稳定性加速度计的重大进展。
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引用次数: 18
期刊
2018 IEEE Micro Electro Mechanical Systems (MEMS)
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