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2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems最新文献

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Bead-Immobilized Molecular Beacons for High Throughput SNP Genotyping Via a Microfluidic System 微流控系统用于高通量SNP基因分型的珠状固定化分子信标
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805379
R. Sochol, A. Mahajerin, B. Casavant, P. Singh, M. Dueck, L. Lee, L. Lin
This paper reports the first demonstration of single nucleotide polymorphism (SNP) genotyping via molecular beacon probes immobilized on polystyrene microbead substrates within a dynamic microfluidic system. Additionally, we present an optimized bead immobilization technique, micropost array trapping (¿PAT), for high-density and high-throughput arraying of beads. Quantitative detection was achieved at room temperature for three label-free DNA oligonucleotide sequences based on the genome of the Hepatitis C Virus (HCV) in humans. SNP detection technology is integral for the realization of personalized medicine and genetic disease identification, and this system offers a promising technique for fast, sensitive, and cost-effective SNP genotyping.
本文报道了在动态微流控系统中利用分子信标探针固定在聚苯乙烯微珠底物上进行单核苷酸多态性(SNP)基因分型的首次演示。此外,我们提出了一种优化的珠子固定技术,微柱阵列捕获(¿PAT),用于高密度和高通量的珠子阵列。基于人丙型肝炎病毒(HCV)基因组的三个无标记DNA寡核苷酸序列在室温下实现了定量检测。SNP检测技术是实现个性化医疗和遗传病鉴定不可或缺的一部分,该系统为快速、灵敏、经济的SNP基因分型提供了一种有前景的技术。
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引用次数: 6
Fabrication of Biodegradable Microcapsules Utilizing 3D, Surface Modified PDMS Microfluidic Devices 利用三维、表面改性PDMS微流控装置制备可生物降解微胶囊
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805477
C. Liao, Y. Su
We have successfully demonstrated the fabrication of biodegradable and magnetic microcapsules utilizing PDMS double emulsification devices. Specially designed 3D microfluidic channels with surface modified by a self-aligned photo-grafting process are employed to shape immiscible fluids into monodisperse W/O/W emulsions. By varying the outer and inner fluid flow-rates, the overall and core sizes of the resulting double emulsions can be adjusted accordingly. Biodegradable materials and surface-treated ¿-Fe2O3 nanoparticles are dispersed uniformly in the middle organic phase, and solidified into magnetic microcapsules once the solvent is extracted. In the prototype demonstration, microcapsules made up of poly(L-lactic acid), trilaurin and phosphocholine (DOPC) are successfully fabricated. As such, the proposed PDMS micro-devices could potentially serve as versatile encapsulation tools, which are desired for a variety of biological and pharmaceutical applications.
我们成功地演示了利用PDMS双乳化装置制备可生物降解的磁性微胶囊。采用特殊设计的三维微流体通道,表面经过自对准光接枝工艺修饰,将不混相流体塑造成单分散的W/O/W乳液。通过改变外部和内部流体的流速,可以相应地调整所得到的双乳液的总体尺寸和核心尺寸。可生物降解材料和表面处理过的¿-Fe2O3纳米颗粒均匀地分散在中间有机相中,一旦溶剂被提取,就会固化成磁性微胶囊。在原型演示中,成功制备了由聚l -乳酸、三叶草苷和磷酸胆碱(DOPC)组成的微胶囊。因此,所提出的PDMS微设备可以潜在地作为多功能封装工具,用于各种生物和制药应用。
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引用次数: 0
Stretchable Yarn of Display Elements 显示元件的可拉伸纱线
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805560
S. Takamatsu, Kiyoshi Matsumoto, I. Shimoyama
We developed the processing technique to form three-dimensionally coiled yarns of display elements from microfabricated organic displays on flat plastic foils in order to realize stretchable electronics. Three dimensional fabrics like sweaters have been much attention as elastic substrates for stretchable electronic devices, but the deposition and patterning of functional materials on the fabric are incompatible to planar process technique of MEMS. To solve this problem, we propose the fabrication technique where firstly display components are constructed on flat plastic foils and the foils are, then, processed to form them into coiled yarns. In detail of the process, organic electrochromic displays are fabricated on the releasable parylene films above the glass. The foils with displays are cut into yarns with dicing cutters and released from the glass. To make yarns stretchable, the resultant foils are spirally rolled around elastic core fibers, forming helical coiled structure. The stretch ratio of the fabricated yarn is tuned with its pitch angle, ranging from 1 to 2. Finally, we demonstrate the projection of the selected one pixel out of 4 pixels both before and after the yarn is stretched at its ratio of 1.3.
为了实现可伸缩电子学,我们开发了在平面塑料箔上由微加工有机显示器形成显示元件三维卷曲纱线的加工技术。毛衣等三维织物作为可拉伸电子器件的弹性衬底备受关注,但功能材料在织物上的沉积和图像化与微机电系统的平面工艺技术不兼容。为了解决这一问题,我们提出了一种制作技术,首先将显示元件构建在平面塑料薄膜上,然后将薄膜加工成盘绕的纱线。在该工艺的细节中,有机电致变色显示器是在玻璃上方的可释放的聚对二甲苯薄膜上制造的。用切丁刀将带有显示器的箔片切成纱线,然后从玻璃中释放出来。为了使纱线具有可拉伸性,所得到的箔绕弹性芯纤维旋转,形成螺旋盘绕结构。根据纱线的俯仰角调整纱线的拉伸比,范围从1到2。最后,我们演示了纱线以1.3的比例拉伸前后,从4个像素中选择一个像素的投影。
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引用次数: 3
An Electrically-Driven, Large-Deflection, High-Force, Micro Piston Hydraulic Actuator Array for Large-Scale Microfluidic Systems 一种用于大型微流体系统的电驱动、大偏转、高力、微活塞液压执行器阵列
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805424
Hanseup Kim, K. Najafi
This paper describes a proof-of-concept all-electrical individually-addressable micro piston actuator array that produces high displacement and force by utilizing hydraulic amplification and electrostatic control. This new class of actuator arrays can remove a critical hurdle, pneumatic control ports to lab-on-chips, and achieve fully-integrated, large-scale, and all-electrical microfluidic systems. The fabricated actuator consists of a 3×3 array of 2×2mm2 membranes and produces maximum deflections of 35, 23, and 11 ¿m when hydraulicallydriven by piezoelectric actuation at 100, 80, 60V, respectively. The corresponding hydraulic amplification ratios are 3.2, 3, and 2.5, respectively. The array functions up to a frequency of 2Hz without failing, while allowing control over individual actuators by utilizing electrostatic latching at 100V. The active device part measures as 8.4×8.4×0.65mm3.
本文介绍了一种概念验证的全电动可寻址微型活塞执行器阵列,该阵列利用液压放大和静电控制产生高位移和力。这种新型的执行器阵列可以消除一个关键的障碍,气动控制端口到芯片上的实验室,并实现完全集成的,大规模的,全电微流体系统。制造的致动器由2×2mm2膜的3×3阵列组成,当在100,80,60v电压下由压电驱动时,分别产生35,23和11¿m的最大挠度。相应的水力放大比分别为3.2、3、2.5。该阵列的工作频率高达2Hz而不会发生故障,同时允许通过使用100V的静电闭锁来控制单个致动器。有源器件部分测量为8.4×8.4×0.65mm3。
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引用次数: 22
Piezoelectric PZT Thin Films in the 100nm Range: A Solution for Actuators Embedded in Low Voltage Devices 100nm范围的压电PZT薄膜:嵌入在低压器件中的执行器的解决方案
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805458
E. Defay, G. Le Rhun, F. Perruchot, P. Rey, A. Suhm, M. Aid, L.J. Liu, S. Pacheco, M. Miller
This paper reports the piezoelectric properties of sputtered and sol gel PZT thin films investigated in a low thickness range (100-250nm). Piezoelectric-elastic bimorphs including very thin PZT films were realized and the maximum reachable deflection at 5V was characterized. The depoling effect experienced by the PZT versus the maximum post process temperature is also discussed which leads to the motivation of developing low thickness range PZT thin films. Elastic-piezoelectric bimorphs were realized and exhibited deflection higher than 5¿m at 5V. Moreover, these bimorphs showed only a 10% decrease of the deflection after 5 billions cycles.
本文报道了低厚度范围(100-250nm)溅射和溶胶凝胶PZT薄膜的压电性能。实现了包括极薄PZT薄膜在内的压电弹性双晶,并表征了5V下的最大可达挠度。本文还讨论了PZT在最大制程温度下的脱极效应,从而得出了开发低厚度PZT薄膜的动机。实现了弹性压电双晶,并在5V下表现出大于5¿m的挠度。此外,经过50亿次循环后,这些双晶的偏转只减少了10%。
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引用次数: 9
Frequency Drift Compensation in Mass-Sensitive Chemical Sensors based on Periodic Stiffness Modulation 基于周期刚度调制的质量敏感化学传感器频率漂移补偿
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805374
K. S. Demirci, Jae Hyeong Seo, S. Truax, L. Beardslee, Y. Luzinova, B. Mizaikoff, O. Brand
The successful compensation of frequency drift in a mass-sensitive chemical microsensor is demonstrated. The proposed compensation method uses a periodic stiffness modulation, generated by a second feedback loop, to monitor the microresonator's quality factor (Q-factor). The Q-factor is solely obtained from frequency measurements and monitored along with the measurand-induced frequency shift during normal closed-loop sensor operation. This simultaneous measurement of Q-factor and frequency shift enables the compensation of frequency drift induced by environmental disturbances using the extracted Q-factor. The feasibility of drift compensation has been demonstrated by implementing the compensation scheme into a closed-loop chemical sensing system and performing gas-phase chemical measurements.
介绍了一种质量灵敏化学微传感器的频率漂移补偿方法。所提出的补偿方法使用由第二反馈回路产生的周期性刚度调制来监测微谐振器的质量因子(q因子)。q因子仅从频率测量中获得,并在正常闭环传感器工作期间与测量引起的频移一起监测。同时测量q因子和频移,可以利用提取的q因子补偿由环境干扰引起的频率漂移。通过将补偿方案应用于闭环化学传感系统并进行气相化学测量,验证了漂移补偿的可行性。
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引用次数: 5
Electrodeposition of Permalloy in Deep Silicon Trenches Without Edge-Overgrowth Utilizing Dry Film Photoresist 利用干膜光刻胶在无边缘生长的深硅沟槽中电沉积坡莫合金
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805476
Sangwon Park, D. Senesky, A. Pisano
An electrodeposition process for embedding NiFe alloys in deep silicon trenches (100 ¿m) without edge-overgrowth was developed by utilizing dry film photoresist as a sacrificial trench top. The dry film photoresist prevented high concentration of current flux at the trench edges during electrodeposition leading to planar deposition topographies. In addition, the effect of the applied current density on material composition of the electrodeposited NiFe film was investigated, and the composition for permalloy (Ni80Fe20) was obtained with a current density of 100 mA/cm2. Furthermore, the B-H response of the electrodeposited permalloy films exhibited a saturation magnetic flux density and relative permeability of 1.23 Tesla and 82, respectively. The electrodeposition technique developed in this work was utilized to fabricate a free-standing MEMS electromagnetic linear actuator composed of silicon and permalloy structures.
利用干膜光刻胶作为牺牲沟槽顶部,开发了一种在深硅沟槽(100¿m)中无边缘过度生长的NiFe合金电沉积工艺。干膜光刻胶防止了电沉积过程中沟槽边缘的高浓度电流通量,从而导致平面沉积地形。此外,研究了施加电流密度对电沉积NiFe薄膜材料组成的影响,得到了电流密度为100 mA/cm2时坡莫合金(Ni80Fe20)的组成。电沉积的坡莫合金薄膜的B-H响应分别为1.23 Tesla和82 Tesla的饱和磁通密度和相对磁导率。利用电沉积技术制备了由硅和坡莫合金结构组成的独立MEMS电磁线性执行器。
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引用次数: 4
Accuracy Enhancement in the In-Plane Dynamic Measurement of MEMS Actuators using a Laser Doppler Vibrometer with a 45°-Angled Optical Fiber 45°角光纤激光多普勒测振仪提高MEMS致动器平面内动态测量精度
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805545
M. G. Kim, K. Jo, Y. S. Park, W. Jang, J. Lee
On-axis LDV (Laser Doppler Vibrometer), where the direction of incident beam is the same as that of the movement, intrinsically offers an accurate dynamic measurement, but it is not presently applicable to the MEMS actuator with in-plane motion due to no accessibility of the sidewall. The only available measurement method is off-axis LDV, which still shows a serious measurement error depending on the device pattern of the target surface. The on-axis FLDV (Fiber-optic LDV) with a 45°-angled optical fiber is proposed to accurately measure the in-plane motion of MEMS actuator. The performance of the proposed FLDV is evaluated in terms of signal stability and the measurable range.
轴上LDV(激光多普勒振动计),其中入射光束的方向与运动的方向相同,本质上提供了一个准确的动态测量,但目前并不适用于MEMS执行器与平面内运动,由于没有可及的侧壁。目前唯一可用的测量方法是离轴LDV,但由于目标表面的器件模式,该方法仍然存在严重的测量误差。为了精确测量MEMS驱动器的平面内运动,提出了一种45°角光纤的on-轴FLDV (fiber -optic LDV)。从信号稳定性和可测量范围两个方面对所提出的FLDV的性能进行了评价。
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引用次数: 1
StarJet: Pneumatic Dispensing of Nano- to Picoliter Droplets of Liquid Metal StarJet:气动点胶纳米至皮升液滴的液态金属
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805314
T. Metz, G. Birkle, R. Zengerle, P. Koltay
In this work we present a novel, simple and robust, pneumatically actuated dispenser for nano- to picoliter sized droplets of liquid metals. The so called StarJet dispenser utilizes a star-shaped nozzle geometry that stabilizes plugs of liquid in the centre of the nozzle by capillary force. This minimizes the wall contact of the liquid plug and reduces contact line friction. Individual droplets of liquid metal can be pneumatically generated by interplay of the sheathing gas flow in the outer grooves of the nozzle and the liquid metal. The working principle was first discovered and studied by Computational Fluid Dynamic (CFD) simulations. For experimental validation silicon chips with the star-shaped geometry were fabricated by Deep Reactive Ion Etching (DRIE) and assembled into a printhead. With different nozzle chips volumes between 120 pl and 3.6 nl could be generated at natural frequencies of 90 Hz and 400 Hz. The StarJet can either be operated as drop on demand or as continuous droplet dispenser. We printed columns of metal with 0,5 to 1,0 mm width and 40 mm height (aspect ratio ≫40) to demonstrate the directional stability of the ejection.
在这项工作中,我们提出了一种新颖,简单且坚固的气动驱动分配器,用于纳米至皮升大小的液态金属液滴。所谓的StarJet分配器利用星形喷嘴的几何形状,通过毛细管力稳定喷嘴中心的液体塞。这最大限度地减少了液体塞的壁面接触,减少了接触线摩擦。单个液态金属液滴可以通过喷嘴外槽和液态金属的护套气流的相互作用气动产生。通过计算流体力学(CFD)模拟,首次发现并研究了其工作原理。为了实验验证,采用深度反应离子刻蚀(Deep Reactive Ion Etching, DRIE)法制备了星形硅片,并组装成打印头。使用不同的喷嘴芯片,在90 Hz和400 Hz的固有频率下可以产生120 pl和3.6 nl之间的体积。StarJet既可以按需滴滴,也可以连续滴滴。我们打印了宽0.5 ~ 1.0 mm、高40mm(长宽比> 40)的金属柱,以证明喷射的方向稳定性。
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引用次数: 21
Ultra-Compact Integration for Fully-Implantable Neural Microsystems 全植入式神经微系统的超紧凑集成
Pub Date : 2009-03-27 DOI: 10.1109/MEMSYS.2009.4805360
G. E. Perlin, K. Wise
A new approach to microsystem integration to replace conventional area-consuming platform architectures with an overlay integration cable is presented. A parylene cable carrying interconnect lines is used to integrate a 3-D array of silicon microelectrodes with a custom-designed signal conditioning chip to realize a neural recording microsystem in its most compact form. This low-profile integrated front-end was implanted in a guinea pig and used to obtain discriminable neural activity.
提出了一种新的微系统集成方法,以覆盖集成电缆取代传统的面积消耗平台架构。利用携带互连线的聚对二甲苯电缆将三维硅微电极阵列与定制的信号调理芯片集成在一起,以最紧凑的形式实现神经记录微系统。这种低姿态的集成前端被植入豚鼠体内,用来获得可辨别的神经活动。
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引用次数: 22
期刊
2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems
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