Mixing control by frequency variable magnetic micropillar

Yu, Haojie; Nguyen, Thien-Binh; Ng, Sum Huan; Tran, Tuan

doi:10.1039/c5ra24996a

Cited by 9 publications

(3 citation statements)

References 37 publications

(40 reference statements)

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“…The schematic diagrams for three experimental setups corresponding to three modes are shown in Figure S12 (Supporting Information). Despite various deformation modes being realized with different micropillar arrays, [15,23,[41][42][43] our method offers distinct advantages: 1) Our approach enables the creation of more complicated magnetization profiles, including both continuous magnetization (Figure 4b,e) and discrete magnetization (Figure 4h), providing higher flexibility in designing and tailoring the micropillar behavior. For instance, while crawling has been achieved with previous unidirectional or continuous magnetization, [15,16,24,43] our method permits a 180°shift in magnetization between lines.…”

Section: Demonstration Of Four Representative Functionalitiesmentioning

confidence: 99%

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Sun,

Zhang,

Zhao

et al. 2023

Adv Materials Technologies

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Magnetic micropillars have shown great promise in various applications including information storage, fluid manipulation, and soft robotics. But to date, magnetic micropillars with reprogrammable magnetization, multi‐modal deformation and functionality, and on‐demand fast actuation have not been reported yet. Herein, locally reprogrammable ferromagnetic micropillars with on‐demand reconfiguration and multi‐functionality are reported. The magnetic micropillars are fabricated by dispersing CrO2 microparticles (diameter ≈5 µm, Curie temperature Tc = 110 °C) in the Ecoflex matrix. The magnetization of each micropillar can be easily programmed and reprogrammed by simultaneously heating the micropillar above Tc via laser and applying a magnetizing field. The magnetization can be programmed as omnidirectional in three dimensions, thus entire magnetic micropillar arrays show a variety of deformation modes (including both synchronous and asynchronous modes) with on‐demand fast actuation by remotely applying magnetic fields. Four representative functionalities of the magnetic micropillars are demonstrated: information encryption, particle pumping, ink mixing, and underwater crawling robot.

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Section: Demonstration Of Four Representative Functionalitiesmentioning

confidence: 99%

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Sun,

Zhang,

Zhao

et al. 2023

Adv Materials Technologies

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“…28 While passive micromixers include the intricate structure of microchannel or long mixing length to achieve the desired mixing output, active mixers utilize external energy to induce flow disturbance to enhance mixing. 29 Exploiting magnetic force is a convenient technique because of advantages such as convenient bio-functionalizing of magnetic particles, remote control and straightforward design. 24,26 Combining magnetism and fluid flow in the microscale for actuation and sensing applications led to the field of micro magnetofluidics.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic nanoparticles on mixing in droplet-based microfluidics

et al. 2019

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High-throughput, rapid and homogeneous mixing of microdroplets in a small length scale such as that in a microchannel is of great importance for lab-on-a-chip applications. Various techniques for mixing enhancement in microfluidics have been extensively reported in the literature. One of these techniques is the mixing enhancement with magnetofluidics using ferrofluid, a liquid with dispersed magnetic nanoparticles. However, a systematic study exploring the mixing process of ferrofluid and its influencing parameters is lacking. The present study numerically examines the effect of key parameters including magnetic field,

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“…Micromachined pieces of magnetic materials or chains of magnetic colloids have been applied as microstir bars to increase the efficiency of mixing in microfluidic channels and microdroplets . Mixing at the microscale can also be enhanced using micropillars or artificial cilia consisting of magnetic micro or nanoparticle assemblies that can be actuated through application of a rotating or a swinging magnetic field . These magnetic cilia can form the basis of flow or vibration sensing when coupled to a giant magnetoresistive sensing element that monitors their deflection .…”

Section: Introductionmentioning

confidence: 99%

Assembly and Characterizations of Bifunctional Fluorescent and Magnetic Microneedles With One Decade Length Tunability

Lugagne

Brackx

Seyrek

et al. 2017

Adv Funct Materials

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This report presents the fabrication of bifunctional magnetic and fluorescent microneedles (µNDs) made of a ternary mixture of magnetic nanoparticles (NPs), quantum dots (QDs), and polyelectrolyte. The assembly relies on the electrostatic complexation of negatively charged NPs with positively charged polymer strands and is controlled by the charge ratio between the nanoparticle building blocks and the polymer mortar. The resulting 1D objects can be actuated using an external magnetic field and can be imaged using fluorescence micro scopy, thanks to the fluorescent and superparamagnetic properties inherited from their NP constituents. Using a combination of core and surface characteri zations and a stateoftheart image analysis algorithm, the dependence of the brightness and length on the ternary composition is thoroughly investigated. In particular, statistics on hundreds of µNDs with a range of compositions show that the µNDs have a loglormal length distribution and that their mean length can be robustly tuned in the 5-50 µm range to match the relevant length scales of various applications in micromixing, bioassays or biomechanics.

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Mixing control by frequency variable magnetic micropillar

Abstract: We demonstrate an active mixing enhancement method based on actuation of a single magnetic micropillar with variable beating frequency.

Cited by 9 publications

References 37 publications

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Locally Reprogrammable Magnetic Micropillars with On‐Demand Reconfiguration and Multi‐Functionality

Effects of magnetic nanoparticles on mixing in droplet-based microfluidics

Assembly and Characterizations of Bifunctional Fluorescent and Magnetic Microneedles With One Decade Length Tunability

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