An electromagnetic micro-actuator with PDMS-Fe3O4 nanocomposite magnetic membrane

Paknahad, Ali; Tahmasebipour, Mohammad

doi:10.1016/j.mee.2019.111031

Cited by 23 publications

(12 citation statements)

References 23 publications

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“…The membrane is deflected by an actuator to pump the fluid into the microchannel. Micropumps have been designed and developed with different mechanisms including electromagnetic [2][3][4], shape memory alloy (SMA) [5], electrostatic [6], piezoelectric [7], and thermal [8] mechanisms. The electromagnetic membrane micropumps have higher flow rates, and quicker response [9] compare to the SMA, thermal, and piezoelectric micropumps.…”

Section: Introductionmentioning

confidence: 99%

A novel electromagnetic micropump with PDMS membrane supported by a stainless-steel microstructure

Tahmasebipour

2023

J. Micromech. Microeng.

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As a main component, membrane micropumps play a key role in developing microfluidic systems. This part pumps fluids by deflecting a membrane using a micro-actuator with a deflection range of a few micrometers during a few seconds. Most electromagnetic micropumps have low lifetime and fracture toughness or low recovery speed. Micropumps with metallic mass-spring structures can overcome the mentioned disadvantages or limitations. This study investigated the fabrication and characterization of a novel electromagnetic micropump. The proposed micropump consists of a stainless-steel mass-spring structure, a polydimethylsiloxane (PDMS) body and membrane, a permanent NdFeB magnet, a micro-coil, and a 3D printed spacer. To characterize the micropump, the effects of the frequency and duty cycle of the electric current applied to the micro-coil on the micropump flow rate and the membrane deflection vs. time were investigated. A membrane deflection of ±8 µm was obtained in 4 s by applying 1000 mA electrical current to the micro-coil. The maximum volumetric flow rate of 523 nL/s was obtained at a frequency of 125 mHz and a duty cycle of 50%. The von Mises stress distribution in the micropump membrane and variations of the fluid velocity in the microchannels were analyzed using the finite element method (FEM).

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Section: Introductionmentioning

confidence: 99%

A novel electromagnetic micropump with PDMS membrane supported by a stainless-steel microstructure

Tahmasebipour

2023

J. Micromech. Microeng.

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“…Digital microscopes or cameras were commonly employed to carry out direct measurement of magnetic displacement of ME material. [10][11][12][13] However, they are limited in resolution when it comes to magnetic deflection or deformation within sub-micrometre scale. Electrical techniques, including strain gauge are relatively more accurate and low-cost.…”

Section: Introductionmentioning

confidence: 99%

Low‐Field Actuating Magnetic Elastomer Membranes Characterized using Fibre‐Optic Interferometry

Li,

Coote,

Subburaman

et al. 2023

Adv Funct Materials

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Smart robotic devices remotely powered by magnetic field have emerged as versatile tools for wide biomedical applications. Soft magnetic elastomer (ME) composite membranes with high flexibility and responsiveness are frequently incorporated to enable local actuation for wireless sensing or cargo delivery. However, the fabrication of thin ME membranes with good control in geometry and uniformity remains challenging, as well as the optimization of their actuating performances under low fields (milli‐Tesla). In this work, the development of ME membranes comprising of low‐cost magnetic powder and highly soft elastomer through a simple template‐assisted doctor blading approach, is reported. The fabricated ME membranes are controllable in size (up to centimetre‐scale), thickness (tens of microns) and high particle loading (up to 70 wt.%). Conflicting trade‐off effects of particle concentration upon magnetic responsiveness and mechanical stiffness are investigated and found to be balanced off as it exceeds 60 wt.%. A highly sensitive fibre‐optic interferometric sensing system and a customized fibre‐ferrule‐membrane probe are first proposed to enable dynamic actuation and real‐time displacement characterization. Free‐standing ME membranes are magnetically excited under low field down to 2 mT, and optically monitored with nanometer accuracy. The fast and consistent responses of ME membranes showcase their promising biomedical applications in nanoscale actuation and sensing.

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“…Li et al [42] proposed the novel asymmetric NIR-driven bilayer actuator by integrating the photothermal effect of carbon nanotubes (CNTs) and thermo-responsiveness of PNIPAM. Compared with the traditional carbon-based photothermal materials, Fe 3 O 4 nanoparticles also possess a high photothermal transformation efficiency and unique magnetic responsive capability, [43][44][45][46] endowing their composites and derivatives with multiple responsiveness. However, it is challenging to establish interactions between Fe 3 O 4 nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Stimuli‐Responsive Weldable Bilayer Actuator with Programmable Patterns and 3D Shapes

Sun,

Zhao,

Che

et al. 2023

Adv Funct Materials

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Soft actuators can harvest environmental energy and convert it into kinetic energy for motions like bending, twisting, stretching, and contracting. However, it remains challenging to design soft film actuators for complex and programmable deformation in three dimensions. Herein, a weldable and patternable multi‐stimuli‐responsive bilayer soft actuator is developed by a mask‐assisted spraying coating process, and its 3D geometries are achieved by welding the sodium alginate (SA) layer using water. The intrinsic hygroscopicity of SA film and the magnetic and photothermal properties of Fe3O4 nanoparticles enable reversible deformation of the bilayer actuator under three different external stimuli: moisture, magnetic field, and sunlight. Based on these properties, a variety of multi‐stimuli‐responsive intelligent devices are developed including smart curtains, smart grippers, biomimetic walkers, rolling actuators, swimmers, and windmill rotators. All these actuating stimulations are derived from naturally renewable energy without the consumption of any artificial energy, providing important enlightenment for green and sustainable applications of soft actuators.

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An electromagnetic micro-actuator with PDMS-Fe3O4 nanocomposite magnetic membrane

Cited by 23 publications

References 23 publications

A novel electromagnetic micropump with PDMS membrane supported by a stainless-steel microstructure

A novel electromagnetic micropump with PDMS membrane supported by a stainless-steel microstructure

Low‐Field Actuating Magnetic Elastomer Membranes Characterized using Fibre‐Optic Interferometry

Multi‐Stimuli‐Responsive Weldable Bilayer Actuator with Programmable Patterns and 3D Shapes

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