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Magnetic Actuation Systems and Magnetic Robots for Gastrointestinal Examination and Treatment 被引量:1
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作者 Hongbo Sun Jianhua Liu Qiuliang Wang 《Chinese Journal of Electrical Engineering》 CSCD 2023年第1期3-28,共26页
Magnetic actuation technology(MAT)provides novel diagnostic tools for the early screening and treatment of digestive cancers,which have high morbidity and mortality rates worldwide.The application of magnetic actuatio... Magnetic actuation technology(MAT)provides novel diagnostic tools for the early screening and treatment of digestive cancers,which have high morbidity and mortality rates worldwide.The application of magnetic actuation systems and magnetic robots in gastrointestinal(GI)diagnosis and treatment to provide a comprehensive reference manual for scholars in the field of MAT research are reviewed.It describes the basic principles of magnetic actuation and magnetic field safety,introduces the design,manufacturing,control,and performance parameters of magnetic actuation systems,as well as the applicability and limitations of each system for different parts of the GI tract.It analyzes the characteristics and advantages of different types and functions of magnetic robots,summarizes the challenges faced by MAT in clinical applications,and provides an outlook on the future prospects of the field. 展开更多
关键词 magnetic actuation medical robots capsule endoscope electromagnetic permanent magnets
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On-chip immunomagnetic bead swarm based on magnetic actuation and mechanical vibration for biological detection
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作者 PAN JingWen GONG De +7 位作者 SAEED Rehan CAO KaiHeng CHEN KeHan SU Yuan ZHANG WenQiang XU WenTao CAI Jun ZHANG DeYuan 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2022年第11期2573-2581,共9页
Immunomagnetic bead(IMB)-based detection has great potential for biomedical applications.Passive and active strategies,including microfluidics and magnetic actuation methods,have been developed to mix IMBs and analyte... Immunomagnetic bead(IMB)-based detection has great potential for biomedical applications.Passive and active strategies,including microfluidics and magnetic actuation methods,have been developed to mix IMBs and analytes efficiently.However,cost-effective on-site detection using a simple microfluidic chip is challenging,and miniaturization of the magnetic driving device is imperative for portability.In this study,we propose a novel mixing method for an on-chip IMB swarm via magnetic actuation and mechanical vibration.A microfluidic chip system coupled with double spiral magnetic coils and a vibration motor was fabricated.The aggregation behavior of IMBs under magnetic fields and the diffusion behavior of the IMB swarm under mechanical vibration were analyzed in detail.Based on the synergetic effects of magnetic actuation and mechanical vibration,we achieved the highly efficient capturing of Vibrio parahaemolyticus DNA and goat anti-human immunoglobulin G by mixing the IMB swarm with the microfluidic chip.In this case,the antigen detection rate could reach~94.4%.Given its fascinating features,such IMB-microfluidic detection demonstrates significant potential for biomedical applications. 展开更多
关键词 immunomagnetic bead swarm microfluidic chip magnetic actuation mechanical vibration biomedical detection
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Delivering Microrobots in the Musculoskeletal System
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作者 Mumin Cao Renwang Sheng +10 位作者 Yimin Sun Ying Cao Hao Wang Ming Zhang Yunmeng Pu Yucheng Gao Yuanwei Zhang Panpan Lu Gaojun Teng Qianqian Wang Yunfeng Rui 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期585-617,共33页
Disorders of the musculoskeletal system are the major contributors to the global burden of disease and current treatments show limited efficacy.Patients often suffer chronic pain and might eventually have to undergo e... Disorders of the musculoskeletal system are the major contributors to the global burden of disease and current treatments show limited efficacy.Patients often suffer chronic pain and might eventually have to undergo end-stage surgery.Therefore,future treatments should focus on early detection and intervention of regional lesions.Microrobots have been gradually used in organisms due to their advantages of intelligent,precise and minimally invasive targeted delivery.Through the combination of control and imaging systems,microrobots with good biosafety can be delivered to the desired area for treatment.In the musculoskeletal system,microrobots are mainly utilized to transport stem cells/drugs or to remove hazardous substances from the body.Compared to traditional biomaterial and tissue engineering strategies,active motion improves the efficiency and penetration of local targeting of cells/drugs.This review discusses the frontier applications of microrobotic systems in different tissues of the musculoskeletal system.We summarize the challenges and barriers that hinder clinical translation by evaluating the characteristics of different microrobots and finally point out the future direction of microrobots in the musculoskeletal system. 展开更多
关键词 MICROROBOT Musculoskeletal system Targeted delivery Microrobotic systems magnetic actuation
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Tailorable,Lightweight and Superelastic Liquid Metal Monoliths for Multifunctional Electromagnetic Interference Shielding 被引量:4
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作者 Yadong Xu Zhiqiang Lin +5 位作者 Krishnamoorthy Rajavel Tao Zhao Pengli Zhu Yougen Hu Rong Sun Ching-Ping Wong 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第2期136-150,共15页
Liquid metal(LM)has become an emerging material paradigm in the electromagnetic interference shielding field owing to its excellent electrical conductivity.However,the processing of lightweight bulk LM composites with... Liquid metal(LM)has become an emerging material paradigm in the electromagnetic interference shielding field owing to its excellent electrical conductivity.However,the processing of lightweight bulk LM composites with finite package without leakage is still a great challenge,due to high surface tension and pump-out issues of LM.Here,a novel confined thermal expansion strategy based on expandable microsphere(EM)is proposed to develop a new class of LM-based monoliths with 3D continuous conductive network.The EM/LM monolith(EM/LMm)presents outstanding performance of lightweight like metallic aerogel(0.104 g cm^(-1)),high strength(3.43 MPa),super elasticity(90%strain),as well as excellent tailor ability and recyclability,rely on its unique gas-filled closed-cellular structure and refined LM network.Moreover,the assembled highly conducting EM/LMm exhibits a recorded shielding effectiveness(98.7 dB)over a broad frequency range of 8.2-40 GHz among reported LM-based composites at an ultra-low content of LM,and demonstrates excellent electromagnetic sealing capacity in practical electronics.The ternary EM/LM/Ni monoliths fabricated by the same approach could be promising universal design principles for multifunctional LM composites,and applicable in magnetic responsive actuator. 展开更多
关键词 Liquid metal Elastic monolith Confined thermal expansion Electromagnetic interference shielding magnetic actuation
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A Modified Iterative Learning Control Approach for the Active Suppression of Rotor Vibration Induced by Coupled Unbalance and Misalignment
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作者 Yifan Bao Jianfei Yao +1 位作者 Fabrizio Scarpa Yan Li 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第1期242-253,共12页
This paper proposes a modified iterative learning control(MILC)periodical feedback-feedforward algorithm to reduce the vibration of a rotor caused by coupled unbalance and parallel misalignment.The control of the vibr... This paper proposes a modified iterative learning control(MILC)periodical feedback-feedforward algorithm to reduce the vibration of a rotor caused by coupled unbalance and parallel misalignment.The control of the vibration of the rotor is provided by an active magnetic actuator(AMA).The iterative gain of the MILC algorithm here presented has a self-adjustment based on the magnitude of the vibration.Notch filters are adopted to extract the synchronous(1×Ω)and twice rotational frequency(2×Ω)components of the rotor vibration.Both the notch frequency of the filter and the size of feedforward storage used during the experiment have a real-time adaptation to the rotational speed.The method proposed in this work can provide effective suppression of the vibration of the rotor in case of sudden changes or fluctuations of the rotor speed.Simulations and experiments using the MILC algorithm proposed here are carried out and give evidence to the feasibility and robustness of the technique proposed. 展开更多
关键词 Rotor vibration suppression Modified iterative learning control UNBALANCE Parallel misalignment Active magnetic actuator
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Solar-powered miniature robot for on-site oil spill treatment under magnetic steering
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作者 WANG Ben CHEN YunRui +6 位作者 WANG Yun JI FengTong LI HongYuan NIU ShiChao HAN ZhiWu ZHANG YaBin GUO ZhiGuang 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第7期2164-2175,共12页
Walking on the water surface is an effective method for miniature robots to transport payloads with dramatically decreased interfacial drag. Current aquatic robots reported are generally actuated by a beam of focused ... Walking on the water surface is an effective method for miniature robots to transport payloads with dramatically decreased interfacial drag. Current aquatic robots reported are generally actuated by a beam of focused light that can trigger asymmetrical deformation, enabling the directional movement through horizontal momentum transfer of photoinduced actuation force to the water. However, the operations are heavily dependent on manual manipulation of the focused light, making the long-term actuation and application of the aquatic robots in vast scenarios challenging. Herein, we developed a kind of water striderinspired robot that can autonomously manage the motion on the water surface under solar irradiation, with their direction steerable by a magnetic field. The motion of this bioinspired robot on the water surface was achieved by the use of a solar cell panel as a driving module to enable propulsive motion based on the conversion of light-electric-mechanical energies. The superhydrophobic design of its leg surfaces enables the aquatic robots with weight-bearing and drag-reducing abilities. With the assistance of magnetic navigation, the bioinspired robot can continuously and controllably locomote to the oily spill floating on the water body and collect them with high efficiency. For further demonstration, the treatment of oil spills in a campus pool with high efficiency has also been achieved. This on-site oil-spill treating strategy, taking advantage of a home-made bioinspired robot actuated by natural sunlight under magnetic steering, shows great potential applications in water-body remediation. 展开更多
关键词 miniature robot SUPERHYDROPHOBIC water strider interfacial friction magnetic actuation
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TrinityMag:A novel magnetically actuated miniature robot manipulating system with a human-scale workspace
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作者 LI Dong CHEN BinHan +3 位作者 HUANG ChenYang XU Sheng WU XinYu XU TianTian 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第11期3546-3558,共13页
The development of the magnetic manipulating system is essential for applications of magnetically actuated miniature robots in biomedical practice,such as targeted therapy and precise surgery.However,the workspaces of... The development of the magnetic manipulating system is essential for applications of magnetically actuated miniature robots in biomedical practice,such as targeted therapy and precise surgery.However,the workspaces of existing magnetic manipulating systems for miniature robots are mostly insufficient to manipulate miniature robots inside human bodies.The present study proposes an innovative electromagnets-based manipulating system,TrinityMag,which can produce dynamic three-dimensional(3D)magnetic fields in a human-scale spherical workspace with a 2.6 m diameter.The magnetic field of a single electromagnet is simulated,and a new calibration technic is designed based on deep learning networks.Then,the arrangement of three electromagnets is optimized to produce maximal 3D arbitrary magnetic fields with limited currents.Moreover,a target-tracking algorithm is developed so that the TrinityMag can track the miniature robot in real time.Finally,the TrinityMag is validated in experiments to manipulate a soft millirobot to move in human-scale tortuous tracks with two types of locomotions.The maximum speed of the soft millirobot reaches 11.05 body length/s.Our work contributes to a significant increment in the workspace of the electromagnets-based manipulating system for miniature robots.We further expect that the TrinityMag could push the applications of miniature robots from laboratory to clinical practice. 展开更多
关键词 magnetic manipulating system human-scale workspace magnetically actuated miniature robots
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Detection of pathogenic bacteria by magneto-immunoassays:a review 被引量:1
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作者 Eugen Gheorghiu 《The Journal of Biomedical Research》 CAS CSCD 2021年第4期277-283,共7页
Magnetic particle-based immunoassays are widely used in microbiology-related assays for both microbial capture,separation,analysis,and detection.Besides facilitating sample operation,the implementation of micro-to-nan... Magnetic particle-based immunoassays are widely used in microbiology-related assays for both microbial capture,separation,analysis,and detection.Besides facilitating sample operation,the implementation of micro-to-nanometer scale magnetic beads as a solid support potentially shortens the incubation time(for magnetic immuno capture)from several hours to less than an hour.Analytical technologies based on magnetic beads offer a rapid,effective and inexpensive way to separate and concentrate the target analytes prior to detection.Magneto-immuno separation uses magnetic particles coated with specific antibodies to capture target microorganisms,bear the corresponding antigens,and subsequently separate them from the sample matrix in a magnetic field.The method has been proven effective in separating various types of pathogenic bacteria from environmental water samples and in eliminating background interferences.Magnetic particles are often used to capture target cells(pathogenic bacteria)from samples.In most commercially available assays,the actual identification and quantitation of the captured cells is then performed by classical microbiological assays.This review highlights the most sensitive analytic methods(i.e.,long-range surface plasmon resonance and electrochemical impedance spectroscopy)to detect magnetically tagged bacteria in conjunction with magnetic actuation. 展开更多
关键词 magneto-immuno separation long-range surface plasmon resonance electrochemical impedance spectroscopy periodic magnetic actuation
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A Programmable Inchworm-Inspired Soft Robot Powered by a Rotating Magnetic Field 被引量:2
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作者 Honglin Shen Shuxiang Cai +3 位作者 Zhen Wang Zheng Yuan Haibo Yu Wenguang Yang 《Journal of Bionic Engineering》 SCIE EI CSCD 2023年第2期506-514,共9页
With the growing demand for miniaturized workspaces,the demand for microrobots has been increasing in robotics research.Compared to traditional rigid robots,soft robots have better robustness and safety.With a flexibl... With the growing demand for miniaturized workspaces,the demand for microrobots has been increasing in robotics research.Compared to traditional rigid robots,soft robots have better robustness and safety.With a flexible structure,soft robots can undergo large deformations and achieve a variety of motion states.Researchers are working to design and fabricate flexible robots based on biomimetic principles,using magnetic fields for cable-free actuation.In this study,we propose an inchworm-shaped soft robot driven by a magnetic field.First,a robot is designed and fabricated and force analysis is performed.Then,factors affecting the soft robot’s motion speed are examined,including the spacing between the magnets and the strength and frequency of the magnetic field.On this basis,the motion characteristics of the robot in different shapes are explored,and its motion modes such as climbing are experimentally investigated.The results show that the motion of the robot can be controlled in a two-dimensional plane,and its movement speed can be controlled by adjusting the strength of the magnetic field and other factors.Our proposed soft robot is expected to find extensive applications in various fields. 展开更多
关键词 Soft robot Bio-inspired soft robot magnetic actuation
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Magnetic Kirigami by Laser Cutting 被引量:1
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作者 Jian Wang Yumei Zhou +2 位作者 Lanying Xu Lelun Jiang Liu Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2023年第4期594-601,共8页
Magnetic kirigami with tunable configurations under magnetic actuation is of significant interest in various emerging fields.However,there remains a grand challenge to develop magnetic kirigami with a facile fabricati... Magnetic kirigami with tunable configurations under magnetic actuation is of significant interest in various emerging fields.However,there remains a grand challenge to develop magnetic kirigami with a facile fabrication strategy,programmable mag-netization,and functionality.In this work,we present a novel magnetic kirigami that is readily fabricated by the laser cutting technique.The magnetic kirigami consists of an array of magnetic microplates,each with a programmed magnetization.By applying an actuation magnetic field,each microplate can rotate and even flip,allowing for predesigned kirigami configura-tions.By further coating the surface of the microplate array,the magnetic kirigami can be programmed with functionality.We demonstrate a potential application of information encryption by engineering magnetic kirigami into a magneto-responsive QR code.Providing a simple fabrication strategy,our work paves the way for other applications of magnetic kirigami. 展开更多
关键词 magnetic kirigami Laser cutting magnetic actuation
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3D-printed tissue repair patch combining mechanical support and magnetism for controlled skeletal muscle regeneration
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作者 Xiaocheng Wang Ruibo Zhao +6 位作者 Jian Wang Xinghuan Li Lijuan Jin Wenyu Liu Lifang Yang Yonghua Zhu Zhikai Tan 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2022年第2期249-264,共16页
Physical forces,such as magnetic and mechanical stimulation,are known to play a significant role in the regulation of cell response.In the present study,a biomimetic regeneration patch was fabricated using E-jet 3 D p... Physical forces,such as magnetic and mechanical stimulation,are known to play a significant role in the regulation of cell response.In the present study,a biomimetic regeneration patch was fabricated using E-jet 3 D printing,which integrates mechanical and magnetic stimulation in a biocompatible"one-pot reaction"strategy when combined with a static magnetic field(SMF).The magneto-based therapeutic regeneration patch induced myoblasts to form aligned and multinucleated myotubes,regulated the expression of myogenic-related genes,and activated the p38αmitogen-activated protein kinase pathway via the initiation of myogenic differentiation.To validate the efficiency of the proposed strategy,the regeneration patch was implanted into mice and exposed to a suitable SMF,which resulted in significantly enhanced in vivo skeletal muscle regeneration.The findings demonstrated that appropriate external physical stimulation provides a suitable biophysical microenvironment that is conducive to tissue regeneration.The method used in the present study represents a promising technique to induce the regeneration of damaged skeletal muscle tis sue. 展开更多
关键词 Functional biomaterials magnetic actuation Myogenic differentiation Skeletal muscle regeneration 3D printing
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Magnetostrictive and Kinematic Model Considering the Dynamic Hysteresis and Energy Loss for GMA 被引量:3
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作者 Huifang LIU Xingwei SUN +2 位作者 Yifei GAO Hanyu WANG Zijin GAO 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第2期241-255,共15页
Due to the influence of magnetic hysteresis and energy loss inherent in giant magnetostrictive materials (GMM), output displacement accuracy of giant magnetostrictive actuator (GMA) can not meet the precision and ... Due to the influence of magnetic hysteresis and energy loss inherent in giant magnetostrictive materials (GMM), output displacement accuracy of giant magnetostrictive actuator (GMA) can not meet the precision and ultra precision machining. Using a GMM rod as the core driving element, a GMA which may be used in the field of precision and ultra precision drive engineering is designed through modular design method. Based on the Armstrong theory and elastic Gibbs free energy theory, a nonlinear magnetostriction model which considers magnetic hysteresis and energy loss characteristics is established. Moreover, the mechanical system differential equation model for GMA is established by utilizing D'Alembert's principle. Experimental results show that the model can preferably predict magnetization property, magnetic potential orientation, energy loss for GMM. It is also able to describe magnetostrictive elongation and output displacement of GMA. Research results will provide a theoretical basis for solving the dynamic magnetic hysteresis, energy loss and working precision for GMA fundamentally. 展开更多
关键词 Giant magnetostrictive actuator · Kinematic model · Magnetostrictive model · magnetic hysteresis · Energy loss
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New Generation of Outdoor Vacuum Circuit Breakers with Rated Voltage up to 40.5 kV 被引量:1
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作者 Alexey Chaly Sergey Benzoruk 《Journal of Energy and Power Engineering》 2012年第2期315-320,共6页
The article describes design peculiarities of the novel compact vacuum circuit breaker with rated voltage 40.5 kV. The design incorporates several novel technical solutions: polycarbonate support insulation, mono-sta... The article describes design peculiarities of the novel compact vacuum circuit breaker with rated voltage 40.5 kV. The design incorporates several novel technical solutions: polycarbonate support insulation, mono-stable magnetic actuator, labyrinth pulling insulator, core-type flexible contact and new compact vacuum interrupter (VI). Phases are encapsulated into silicone rubber providing required creepage distance and excellent tracking resistance. These novelties along with extensive modeling of the mechanical and electrical fields followed by design optimization resulted in weight reduction of more than 50% compared with alternatives available in the market. And this is in spite of built in sensors measuring: phase currents, zero-sequence current, phase voltages. 展开更多
关键词 Outdoor vacuum circuit breaker magnetic actuator combined voltage and current sensor silicon rubber.
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Magnetic Actuated Shape-memory Helical Microswimmers with Programmable Recovery Behaviors 被引量:1
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作者 Fu Zhao Weibin Rong +1 位作者 Lefeng Wang Lining Sun 《Journal of Bionic Engineering》 SCIE EI CSCD 2021年第4期799-811,共13页
Inspired by bacterial flagella in nature,magnetic helical microswimmer is an ideal model to perform complex task in a low Reynolds number environments.Shape Memory Polymers(SMPs)with desirable properties are considere... Inspired by bacterial flagella in nature,magnetic helical microswimmer is an ideal model to perform complex task in a low Reynolds number environments.Shape Memory Polymers(SMPs)with desirable properties are considered as one of the most preferred options for the development of small-scale robots.However,fabricating and programming strategies are still challenging.Here,we report an approach to fabricate helical microswimmers based on thermoplastic SMP(polylactic acid).Melt-spun polylactic acid fibers containing magnetic particles were enwound to form helical microstructures.Their shape recovery behaviors were programmed by annealing and pre-deformation.Three forms of helical microswimmers(constant-helix-angle conical helix,constant-pitch conical helix,and straight helix)with controlled morphological parameters were tailored.The obtained microswimmers showed 3D locomotion capability under rotating magnetic fields.The maximum swimming velocity of microswimmers was nearly six body lengths per second,and the near-wall swimming of conical helixes along their sharp end exhibited a smaller drift.Moreover,we demonstrated programmed shape-switching processes(spring-like contraction and elongation,coiling and uncoiling)and self-repairing of the microswimmers.As demonstrations of potential applications,tasks of mobile microstent,cargo delivery,and minimally invasive injection were carried out.The multifunctional shape-memory microswimmers have immense potential in a variety of applications. 展开更多
关键词 helical microrobot magnetic actuation Shape Memory Polymer(SMP) polylactic acid magnetic particles
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Design and Characterization of Magnetically Actuated Helical Swimmers at Submillimeter-scale 被引量:1
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作者 Lefeng Wang Huichao Xu +2 位作者 Wenhe Zhai Bensong Huang Weibin Rong 《Journal of Bionic Engineering》 SCIE EI CSCD 2017年第1期26-33,共8页
Bacteria with helical flagella show an ideal mechanism to swim at low Reynolds number. For application of artificial mi- croswimmers, it is desirable to identify effects of structural and geometrical parameters on the... Bacteria with helical flagella show an ideal mechanism to swim at low Reynolds number. For application of artificial mi- croswimmers, it is desirable to identify effects of structural and geometrical parameters on the swimming performance. In this study, a double-end helical swimmer is proposed based on the usual single-end helical one to improve the forward-backward motion symmetry, The propulsion model of the artificial helical microswimmer is described. Influences of each helix parameter on the swimming velocity and propulsion efficiency are further analyzed. The optimal design for achieving a maximum propulsion velocity of submillimeter scale swimmers is performed based on some constraints. An experimental setup consisting of three-pair of Helmholtz coils is built for the helical microswimmers. Experiments of microswimmers with several groups of parameters were performed, and the results show the validity of the analysis and design. 展开更多
关键词 double-end helical microswimmers magnetic actuation swimming velocity optimal design
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Design of 4D printed shape-changing tracheal stent and remote controlling actuation 被引量:7
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作者 Fenghua Zhang Nan Wen +2 位作者 Linlin Wang Yunqi Bai Jinsong Leng 《International Journal of Smart and Nano Materials》 SCIE EI 2021年第4期375-389,共15页
has a good application prospect.The biodegradable stent can effectively reduce the damage to patients and improve the therapeutic performance of stents.In this work,a series of shape memory polylactic acid(Fe_(3)O_(4)... has a good application prospect.The biodegradable stent can effectively reduce the damage to patients and improve the therapeutic performance of stents.In this work,a series of shape memory polylactic acid(Fe_(3)O_(4))composite tracheal stents were manufactured by 4D printing.The composite tracheal stents with different structures were designed.Moreover,with the addition of magnetic particles Fe3 O4,the shape memory PLA/Fe_(3)O_(4)composite tracheal stent has a magnetic driving effect.Under the magnetic field,the shape recovery process is completed within 40 s,and the shape recovery rate is more than 99%.Moreover,the 4D printed tracheal stent was also triggered by the irradiation of infrared lamp to realize the remote controlling recovery.The research on the structure design and driving method of 4D printing tracheal stent expands the application scope of shape memory polymer composites in biomedical field,provides a new way for personalized implantable medical devices and minimally invasive surgery.It is of great significance for better precision medical treatment. 展开更多
关键词 Shape memory polymer composite 4D printing shape-changing tracheal stent magnetic field actuation infrared light actuation
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A 3D hard-magnetic rod model based on co-rotational formulations 被引量:1
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作者 Yifan Yang Maoyuan Li Fan Xu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第9期130-139,共10页
Hard-magnetic soft materials have attracted broad interests because of their flexible programmability,non-contact activation and rapid response in various applications such as soft robotics,biomedical devices and flex... Hard-magnetic soft materials have attracted broad interests because of their flexible programmability,non-contact activation and rapid response in various applications such as soft robotics,biomedical devices and flexible electronics.Such multifunctional materials consist of a soft matrix embedded with hard-magnetic particles,and can exhibit large deformations under external magnetic stimuli.Here,we develop a three-dimensional(3D)rod model to predict spatial deformations(extension,bending and twist)of slender hard-magnetic elastica.The model follows Kirchhoff hypothesis and thus reduces the 3D magneto-elastic energy function to a one-dimensional(1D)form.Besides,the co-rotational formulation is applied to describe rigid body motion,and explicit time integration is adopted for the nonlinear resolution.Moreover,we explore finite bending,post-buckling and twisting of hard-magnetic elastica under external magnetic fields with different directions and amplitudes.Representative examples with various configurations show superior efficiency and accuracy of the model(the difference less than 1%with only a small number of elements)compared to conventional solid element.Our model could be used to guide rational designs on programmable shape morphing of ferromagnetic slender structures. 展开更多
关键词 Hard-magnetic soft material Slender structure magnetic actuator Co-rotational formulation Large deformation
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Liquid metal spiral coil enabled soft electromagnetic actuator 被引量:6
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作者 GUO Rui SHENG Lei +1 位作者 GONG HengYi LIU Jing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第4期516-521,共6页
Soft robot is a kind of machine form with flexible deformation capability. Making flexible actuators has recently become a hot research topic in the field. In this study, we demonstrated the facile fabrication of a so... Soft robot is a kind of machine form with flexible deformation capability. Making flexible actuators has recently become a hot research topic in the field. In this study, we demonstrated the facile fabrication of a soft electromagnetic actuator using liquid metal coil of Ga-In alloys, and designed several illustrative mechanical devices, such as jellyfish like robot, soft fishtail and flexible manipulator. Measurements of the liquid metal coil's electrical properties confirmed that the liquid metal coil was mechanically stable under 48% uniaxial strains. Furthermore, the resistance of the liquid metal coil is stable under 60° bending deformation. Tests on the liquid metal coil's driving properties confirmed that the liquid metal coil(55 mm×55 mm×1 mm) could reach the maximum displacement amplitude of 21.5 mm with the current of 0.48 A. It was shown that the electromagnetic interaction between the magnet and the liquid metal coil enables the coil as a highly efficient actuator. The mechanisms lying behind were interpreted and future applications of such system were discussed. 展开更多
关键词 liquid metal soft machine electromagnetic actuator magnet artificial system
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Fabrication of cellulose based superhydrophobic microspheres for the production of magnetically actuatable smart liquid marbles
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作者 Xinxing Lin Wei Ma +3 位作者 Hui Wu Liulian Huang Lihui Chen Atsushi Takahara 《Journal of Bioresources and Bioproducts》 EI 2017年第3期110-115,共6页
Cellulose microspheres were fabricated on the basis of sol-gel transition using NaOH/urea/H_(2)O as the solvent system.These microspheres had an average diameter of about 30μm.Upon modification with Fe_(3)O_(4) and p... Cellulose microspheres were fabricated on the basis of sol-gel transition using NaOH/urea/H_(2)O as the solvent system.These microspheres had an average diameter of about 30μm.Upon modification with Fe_(3)O_(4) and poly(DOPAm-co-PFOEA),superhydrophobic magnetic cellulose microspheres were generated,which were analyzed by FTIR,TG,XRD,XPS and water contact angle tests.Magnetic cellulose microspheres contained approximately 15 wt%of Fe_(3)O_(4).Poly(DOPAm-co-PFOEA)/Fe_(3)O_(4)/cellulose microspheres and had a low surface energy and a high water-repellency.These superhydrophobic microspheres were also converted into liquid marbles via an easily scalable process. 展开更多
关键词 Superhydrophobic microspheres magnetically actuatable Smart liquid marble Cellulose microsphere
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Shape memory poly(ether ether ketone)s with tunable chain stiffness,mechanical strength and high transition temperatures
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作者 Shuai Yang Yang He Jinsong Leng 《International Journal of Smart and Nano Materials》 SCIE EI 2022年第1期1-16,I0001,共17页
Shape memory polymers,with intrinsic enhanced strength and high thermal stability,are highly demanded in aerospace,engineering manufacturing,and spatial structures.In this paper,we develop a series of thermoplastic sh... Shape memory polymers,with intrinsic enhanced strength and high thermal stability,are highly demanded in aerospace,engineering manufacturing,and spatial structures.In this paper,we develop a series of thermoplastic shape memory poly(ether ether ketone)s(PEEKs)for the first time,achieving an excellent shape memory ability,high strength,and great thermal stability via a condensation polymerization.Through tuning the proportion of different bisphenol monomers,the flexibility of molecular main chains is adjusted,resulting in the regulation of transition temperature and mechanical performances.Synthesized PEEKs possess the tunable T_(g) from 143.3°C to 178.6°C,the enhanced tensile strength from 48.4 to 65.1 MPa,and Young’s modulus from 0.45 to 1.8 GPa,in addition to the excellent heat-triggered shape memory effect,as indicated by high recovery ratio(94%–98.9%)and fixity ratio(over 99.5%).Furthermore,after incorporating the magnetocaloric Fe_(3)O_(4) particles,the composites exhibit remotely noncontact magnetic-triggered shape memory behaviors(Fe_(3)O_(4) content over 10 wt%).These synthesized T_(g) tunable shape memory PEEKs and the composites have wide utilization potential in fields of engineering and aerospace structures,owing to the excellent mechanical properties,thermal stability,unique programmable deformation ability,and remote actuation. 展开更多
关键词 Shape memory PEEK tunable transition temperature high modulus magnetic actuation
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