Dye-Enhanced Self-Electrophoretic Propulsion of Light-Driven TiO_2–Au Janus Micromotors

Light-driven synthetic micro-/nanomotors have attracted considerable attention in recent years due to their unique performances and potential applications. We herein demonstrate the dye-enhanced self-electrophoretic propulsion of light-driven Ti O_2–Au Janus micromotors in aqueous dye solutions. Compared to the velocities of these micromotors in pure water, 1.7, 1.5, and 1.4 times accelerated motions were observed for them in aqueous solutions of methyl blue(10-5g L^(-1)), cresol red(10^(-4)g L^(-1)),and methyl orange(10^(-4)g L^(-1)), respectively. We determined that the micromotor speed changes depending on thetype of dyes, due to variations in their photodegradation rates. In addition, following the deposition of a paramagnetic Ni layer between the Au and Ti O_2 layers, the micromotor can be precisely navigated under an external magnetic field. Such magnetic micromotors not only facilitate the recycling of micromotors, but also allow reusability in the context of dye detection and degradation.In general, such photocatalytic micro-/nanomotors provide considerable potential for the rapid detection and ‘‘on-thefly'' degradation of dye pollutants in aqueous environments.

Dual-Fuel-Driven Bactericidal Micromotor

In this paper, we report fabrication of the bimetallic Janus microsphere, a magnesium microsphere with a silver surface coating, through thermal evaporation technique. Because of the Janus structure, this micromotor can be propelled in two different directions by the surface silver or magnesium ‘engine' and hydrogen peroxide or water fuel. In addition, due to the bactericidal property of silver, this autonomous micromotor is capable of killing bacteria in solution. As compared to the static one, the micromotor is able to kill the bacteria at a much faster rate(about nine times of that of the static one),demonstrating the superiority of the motion one. We thus believe that the micromotor shown in the current study is potentially attractive for the environmental hygiene applications.

Micromotor-derived composites for biomedicine delivery and other related purposes

Biocompatible designed micromotor has attracted more and more concerns in the field of biomedicine due to their self-propulsion and delivery abilities.Such micromotors,mostly consisting of alkali earth metals,hydrogels,or other motile biomaterials,can effectively transform chemical energy into mechanical or kinetic energy to achieve the expected delivery of cargos to the sites of action.Except for conveying power,the modifiable surface and inner cavity of micromotors guarantee that their potential as versatile delivery systems for therapeutic agents.Here,this review generalizes the propelling mechanisms,composites,and shapes of micromotors.Besides,the application of micromotor-derived composites for biomedicine delivery and other versatile purposes are also discussed.

Recent progress on the design and fabrication of micromotors and their biomedical applications

The advancement in the micro-/nanofabrication techniques has greatly facilitated the development of micromotors.A variety of micromotors have been invented with powerful functions,which have attracted a broad range of interests from chemistry, physics,mechanics,biology and medicine.In this paper,we reviewed recent progress in micromotors and highlighted representative works.The mechanisms of micromotors by internal and external energy sources were described.We described general fabrication strategies of the popular micromotors (wire,tubular,helical and Janus)including bottom-up and top-down approaches.In the application section,we primarily focused on the biological applications,such as biological cargo delivery, biosensing and surgery.At last,we discussed the current challenges and provided future prospects.

Optimization of the Drag Forces of Shell Janus Micromotor:A Study Based on Hydrodynamical Analysis and Numerical Simulation

Micromotors are widely used in cell operation,drug delivery and environmental decontamination due to their small size,low energy consumption and large propelling power.Compared to traditional Janus micromotor,the shell Janusmicromotor has better motion performance.However,the structural optimization of itsmotion performance is still unclear.The main factor restricting the motion performance of shell Janus micromotors is the drag forces.In the current work,theoretical analysis and numerical simulation were applied to analyze the drag forces of shell Janus micromotors.This study aims to design the optimum structure of shell Janus micromotors with minimum drag forces and obtain the magnitude of drag forces considering both the internal and external fluids of the shell Janus micromotors.Moreover,the influence of the motor geometry and Reynolds number on the drag coefficient was analyzed using numerical simulations.The results provide guidance for the optimum flow velocity,opening diameter and shell thickness to achieve minimum drag force.

KEY TECHNOLOGY FOR PRACTICAL 1-mm-DIAMETER ELECTROMAGNETIC MICROMOTOR

A 1 mm diameter electromagnetic micromotor was developed as a crux component for MEMS application. The motor has a novel layer structure with a 1 mm diameter rotor in the middle of two stators with the same size. The stator uses multiple layers, slotless and concentrated planar winding. The rotor adopts multipolar permanent magnet with high performance. Ruby bearing is used to prolong operating lifetime of the micromotor. The stator winding, consisting of 6 layer coils, 42 turns, and 9 pairs, is fabricated with microprocessing techniques. The micromotor has long operation lifetime, its running speed is stable and controllable, and rotational direction can be easily reversed. Maximum achieved rotational speed of 18000 r/min with maximum output torque of 1.5 μ N·m has been obtained. This paper presented the key technology for developing this kind of micromotor including the design of structure, magnetic circuit, heat problem, friction improvement, microprocessing techniques, and so on.

Modeling and Analysis of a Micromotor with an Electrostatically Levitated Rotor

The modeling and evaluation of a prototype rotary micromotor where the annular rotor is supported electrostatically in five degrees of freedom is presented in order to study the behavior of this levitated micromotor and further optimize the device geometry.The analytical torque model is obtained based on the principle of a planar variable-capacitance electrostatic motor while the viscous damping caused by air film between the stator and rotor is derived using laminar Couette flow model.Simulation results of the closed-loop drive motor, based on the developed dynamic model after eliminating mechanical friction torque via electrostatic suspension, are presented.The effects of the high-voltage drive, required for rotation of the rotor, on overload capacity and suspension stiffness of the electrostatic bearing system are also analytically evaluated in an effort to determine allowable drive voltage and attainable rotor speed in operation.The analytical results show that maximum speed of the micromotor is limited mainly by viscous drag torque and stiffness of the bearing system.Therefore, it is expected to operate the device in vacuum so as to increase the rotor speed significantly, especially for those electrostatically levitated micromotors to be used as an angular rate micro-gyroscope.

Motion-based pH sensing using spindle-like micromotors

在这研究，我们报导一台像锭子的微电机。这台设备，用一个一步舞 electrospinning 方法被制作，由可被细菌破坏的 polycaprolactone 和 anionic 表面活化剂组成。有趣地，不是仅仅，产生微电机能为时间的一个长时期在水的表面上独立地移动(~ 40 min )由于 Marangoni 效果，但是在表面活化剂的版本在不同 pH 条件下面引起的表面紧张由于变化察觉到行为也展出 pH 。更有趣地，我们表明察觉到性质的基于运动的 pH 是尺寸依赖者，与展出更高的敏感的更小的结构。另外，自从 polycaprolactone 是可被细菌破坏的材料，微电机在这描述了学习能容易在答案被降级。因此，象一步舞制造，运动读出，和 biodegradability 那样的特征显示这台微电机察觉到应用的一个吸引人的候选人。

体相微马达双气泡聚并驱动的界面演化机制

微纳米马达是建立微流体环境与宏观操控的桥梁,气泡微马达的驱动速度高,这一优势在实际应用中不可替代.管式气泡马达适用于复杂场景但能量转化率低,气泡驱动的Janus微球马达效率高但仅适用于气液界面附近.鉴于此,本文提出通过双气泡聚并方式驱动Janus微球马达的新体系,调和了高能量转化率与界面受限的矛盾.在实验中,借助高速摄像记录了双气泡聚并驱动微马达的~100μs级过程,气泡聚并紧邻微球发生,通过释放的能量驱动微球显著运动,其融合过程是独特的可动曲壁受限下的气液界面演化问题.进一步结合伪势格子Boltzmann数值方法探究了气泡聚并驱动的流体动力学机制.研究结果揭示了不同时段气泡聚并的细节,给出了气泡颗粒尺寸比等因素对微球位移、初始动能转换率的影响,确认了双气泡聚并释放表面能的高效驱动机制.

柔性PCB绕组径向磁通微型永磁电机设计

采用无槽结构的高速微型永磁电机在检测设备、医疗器械等方面应用广泛,但无槽电机绕组制作复杂,使用绕组印制技术可以简化绕组的制作过程。目前已有的印制技术多以刚性印制电路板(PCB)为载体应用于轴向磁通电机,对于径向磁通的高速电机来说,刚性PCB已无法满足绕组沿圆周方向分布的需求,柔性PCB绕组应运而生,不过目前还没有完整的柔性PCB绕组电机设计方案。因此,设计了一款高速微型柔性PCB绕组电机,针对柔性PCB绕组特有的缠绕不等距问题,提出了使用平均半径的解决方案,并通过仿真对电机进行了分析。结果表明,平均半径法解决了绕组缠绕不等距的问题,所设计的柔性PCB绕组电机能达到电机技术要求且具有良好的热稳定性。

MnO_(2)基微马达在环境治理和生物医疗中应用的研究现状

对微马达及相关领域的概念进行了简单阐述,详细介绍了近几十年来发展迅速的MnO_(2)基微马达,重点围绕MnO_(2)基微马达的推进机理和其在环境治理及生物医疗的应用进行阐述。MnO_(2)因为独特的催化特性被广泛地应用于微马达领域,从易于控制反应速率及良好的水污染治理的角度出发,总结了近十几年MnO_(2)基微马达的制备方法、驱动方式、运动性能及其在环境治理及生物医疗的研究进展,着重展示了在国内外研究中MnO_(2)基微马达在水污染治理、水安全检测以及相关医疗疾病治疗方面的成功应用。最后,对MnO_(2)基微马达在未来的发展方向与挑战进行了展望。

基于微电机遥控的继电保护顺控防误操作系统

传统变电站内顺控操作系统主要针对一次设备,不包含对二次保护硬压板的顺序控制,导致顺控工作并不能从根本上改变现有依靠人工逐项操作的工作模式。为此,文中设计了基于微电机遥控的继电保护顺控防误操作系统。设计了继电保护硬压板防误操作告警模块,通过硬压板分位触点的断开与闭合发出告警信息。在典型操作票操作逻辑的基础上,使用一键式微电机遥控防误操作模块支持调度远方程序操作,并通过地线解闭锁管理模块规范管理地线。设计一键式防误操作流程,利用循环冗余校验码分别检测发送端和接收端出现的误码,在顺控操作过程中实现防误操作。实验结果表明,该系统电压输出的上下波动幅度范围为-2.5~2.5 V,且输出波形与理想波形一致,具有良好的防误操作效果。

微电机零部件BMC注塑工艺技术浅析

随着微电机技术的不断发展,电机结构也不断的标准化、集成化,以满足产线大批量生产以及产线自动化的要求;其中,微电机中的关键零部件定子组件及转子组件的制造工艺也发生深刻变化,有通过钣金件作为定转子组件、负载安装连接结构的,也有通过BMC材料作为定转子组件、负载安装连接结构的;随着工业制造4.0的到来,微电机制造厂商也不断的摸索如何实现微电机制造的自动化、智能化,以满足市场低成本、高效率的需求;而BMC注塑作为微电机关键零部件的常用工艺之一,在实现微电机电气安全要求的同时,更能满足这种情形下的要求,给企业带来更高效的经济收益;所以,微电机的零部件注塑工艺技术尤为关键,其工艺水平高低,将制约微电机的制造成本,本文将围绕微电机注塑工艺相关技术进行分析,给微电机制造实际运用提供一些参考。

电磁型平面微电机及其制作工艺

为得到一种尺寸小、输出力矩大、转速高的直流可调速微电机,提出了一种利用微机械加工工艺制作微电机的方法。定子和转子都做成平面结构,定子线圈采用了平面型、无槽式集中绕组;线圈之间采用了三相星形连接方式,采用了微机械LIGA工艺和硅微机械加工工艺;转子采用钕铁硼永磁材料,进行轴向充磁,成辐射状间隔分布。装配时转子分布于定子两侧,不但减小了电机尺寸,还有利于定子的散热。把装配完毕的微电机接通三相半控控制电路对其转速和力矩进行了测试,测试结果表明,电机运转平稳,输出力矩大。

一种微型柱体超声电机的研究

对压电陶瓷片的布局方式与力系数之间的关系进行了分析,证明了压电陶瓷片粘贴在金属弹性体一阶弯振的波谷位置时其激振效率是最高的。研制了一种新型定子结构的微型柱体超声电机。该电机直径5mm,长30mm,重量4.2g。当驱动电压峰峰值为200V,驱动频率为53kHz时,电机最大转速为350r/min,堵转力矩为2.5×10?3N?m。因为这种电机结构比较简单紧凑,便于实现进一步的微型化。所以又利用压电陶瓷管为激励元件,研制出直径2mm,长度7mm,重量为0.258g的微型柱体超声电机。在驱动电压峰峰值为60V,驱动频率75kHz时电机的转速为813r/min。文中详细介绍了这2个微型电机的工作原理、结构特点和设计方法。

轴向磁化永磁微电机磁场分析及设计方法研究

在轴向磁化永磁电机设计中,为研究尺寸效应对其性能的影响,采用有限元方法对这种双转子电机的磁场进行了仿真计算,得出了轴向磁化永磁电机转子的气隙磁密波形分布。分析了转子外形尺寸、充磁极数、磁体厚度和气隙长度对气隙磁密的影响,即随着气隙长度的增加,充磁极数多的其气隙磁密幅值的减小幅度大于充磁极数少的;随着磁体厚度的增加,气隙磁密为一上升曲线,当磁体厚度达到某一点时,气隙磁密幅值基本为一常数;减小转子直径时,随着磁体厚度的降低,平均半径处气隙磁密幅值的减小幅度越来越不明显,但为不使气隙磁密波形变形严重,永磁转子径向长度需至少大于1.5 mm。磁场分析结果可对该类电机微小型化过程中的设计起指导作用。对计算结果做了理论分析,并将计算结果和实验结果进行了比较,计算值和实测值基本一致。

一种用于微型工厂的毫米级全方位移动微机器人设计与分析

介绍了一种尺寸为9 mm×8 mm×8 mm的全方位移动微机器人.采用独特的双轮结构实现了转向时轮与地面的纯滚动.该微机器人由3个直径2 mm的电磁微马达驱动;其中2个用于直线驱动,另一个用于转向.动力学分析揭示了微马达驱动力矩与双轮结构尺寸及各种摩擦之间的关系.仿真计算及实验表明微机器人具有良好的负载能力,满足微型工厂中搬运工作的要求.

电磁微马达驱动全方位永磁轮式爬壁微机器人

介绍了一种全方位微型轮式爬壁机器人.将轴向磁通电磁微马达与永磁轮集成在一起,实现驱动吸附一体化设计.采用一套转向齿轮和三个永磁轮,设计了全方位的爬壁机构.通过动力学分析,导出微机器人爬壁所需的力矩和磁力,并结合永磁轮自身的设计约束,采用ANSOFT和Pro/Engineer仿真对其尺寸进行了优化,从而在相同负载的情况下降低了不必要的力矩损耗.仿真计算和实验结果证明了上述方法的可行性.

压电微马达研究进展

利用网络和图书馆对国际上 1996年至今的压电微马达研究进展进行了调研。分别介绍了压电薄膜、陶瓷的行波、驻波类微马达的最新研究情况 ,同时也对一种具有与压电微马达特性相同的静电超声微马达的研究作了说明 。

毫米级全方位移动微型装配机器人设计、运动学分析与控制

介绍了一种用于微型工厂的毫米级移动微装配机器人,其具有独特的全方位运动结构.微机器人由4个直径3 mm的电磁微马达驱动,并装备有一对微型夹钳.通过分析运动学矩阵的秩,证明了微机器人的全方位特性,并建立了微夹钳的运动学方程.设计了基于计算机视觉的微机器人控制系统,给出了微机器人定位和驱动方法.实验证明了微机器人的负载能力、机动性以及控制系统的有效性.