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Vieira GB, Howard E, Lankapalli P, Phillips I, Hoffmeister K, Holley J. Stray Magnetic Field Variations and Micromagnetic Simulations: Models for Ni 0.8Fe 0.2 Disks Used for Microparticle Trapping. MICROMACHINES 2024; 15:567. [PMID: 38793140 PMCID: PMC11123457 DOI: 10.3390/mi15050567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 04/19/2024] [Accepted: 04/22/2024] [Indexed: 05/26/2024]
Abstract
Patterned micro-scale thin-film magnetic structures, in conjunction with weak (~few tens of Oe) applied magnetic fields, can create energy landscapes capable of trapping and transporting fluid-borne magnetic microparticles. These energy landscapes arise from magnetic field magnitude variations that arise in the vicinity of the magnetic structures. In this study, we examine means of calculating magnetic fields in the local vicinity of permalloy (Ni0.8Fe0.2) microdisks in weak (~tens of Oe) external magnetic fields. To do this, we employ micromagnetic simulations and the resulting calculations of fields. Because field calculation from micromagnetic simulations is computationally time-intensive, we discuss a method for fitting simulated results to improve calculation speed. Resulting stray fields vary dramatically based on variations in micromagnetic simulations-vortex vs. non-vortex micromagnetic results-which can each appear despite identical simulation final conditions, resulting in field strengths that differ by about a factor of two.
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Abedini-Nassab R, Sadeghidelouei N, Shields Iv CW. Magnetophoretic circuits: A review of device designs and implementation for precise single-cell manipulation. Anal Chim Acta 2023; 1272:341425. [PMID: 37355317 DOI: 10.1016/j.aca.2023.341425] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 05/18/2023] [Accepted: 05/24/2023] [Indexed: 06/26/2023]
Abstract
Lab-on-a-chip tools have played a pivotal role in advancing modern biology and medicine. A key goal in this field is to precisely transport single particles and cells to specific locations on a chip for quantitative analysis. To address this large and growing need, magnetophoretic circuits have been developed in the last decade to manipulate a large number of single bioparticles in a parallel and highly controlled manner. Inspired by electrical circuits, magnetophoretic circuits are composed of passive and active circuit elements to offer commensurate levels of control and automation for transporting individual bioparticles. These specifications make them unique compared to other technologies in addressing crucial bioanalytical applications and answering fundamental questions buried in highly heterogeneous cell populations. In this comprehensive review, we describe key theoretical considerations for manufacturing and simulating magnetophoretic circuits. We provide a detailed tutorial for operating magnetophoretic devices containing different circuit elements (e.g., conductors, diodes, capacitors, and transistors). Finally, we provide a critical comparison of the utility of these devices to other microchip-based platforms for cellular manipulation, and discuss how they may address unmet needs in single-cell biology and medicine.
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Affiliation(s)
- Roozbeh Abedini-Nassab
- Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, P.O. Box: 14115-111, Iran.
| | - Negar Sadeghidelouei
- Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, P.O. Box: 14115-111, Iran
| | - C Wyatt Shields Iv
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, 80303, United States
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Sajjad U, Klingbeil F, Block F, Holländer RB, Bhatti S, Lage E, McCord J. Efficient flowless separation of mixed microbead populations on periodic ferromagnetic surface structures. LAB ON A CHIP 2021; 21:3174-3183. [PMID: 34190746 DOI: 10.1039/d1lc00161b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The simultaneous separational control of motion of individual objects is vital to achieve high efficiency separation for biological analytes in biomedical applications. Here, we show the selective and directed movement of different populations of microbeads depending on their size in a flowless environment by means of a hexagonally structured soft-magnetic microchip platform. By adjusting strength and asymmetry of a modulated in-plane magnetic field, discrete and switchable movement patterns of two different types of beads above a magnetic surface structure are achieved. Starting from a heterogeneous mixture of bead populations and depending on the type of field sequences, directional forward transport of one type of beads is achieved, while the other bead population is immobilized. Despite significant size and magnetic content distributions within each population of microbeads, high separation efficiencies are demonstrated. The selection and movement processes are supported by full-scale magnetofluidic numerical simulations. The magnetic platform allowing multidirectional and selective microbead movement can greatly contribute to the progress of functional lab-on-chip and future diagnostics devices.
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Affiliation(s)
- Umer Sajjad
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Finn Klingbeil
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Findan Block
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Rasmus B Holländer
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Shehroz Bhatti
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Enno Lage
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
| | - Jeffrey McCord
- Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany.
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Abedini-Nassab R, Pouryosef Miandoab M, Şaşmaz M. Microfluidic Synthesis, Control, and Sensing of Magnetic Nanoparticles: A Review. MICROMACHINES 2021; 12:768. [PMID: 34210058 PMCID: PMC8306075 DOI: 10.3390/mi12070768] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/22/2021] [Accepted: 06/27/2021] [Indexed: 02/06/2023]
Abstract
Magnetic nanoparticles have attracted significant attention in various disciplines, including engineering and medicine. Microfluidic chips and lab-on-a-chip devices, with precise control over small volumes of fluids and tiny particles, are appropriate tools for the synthesis, manipulation, and evaluation of nanoparticles. Moreover, the controllability and automation offered by the microfluidic chips in combination with the unique capabilities of the magnetic nanoparticles and their ability to be remotely controlled and detected, have recently provided tremendous advances in biotechnology. In particular, microfluidic chips with magnetic nanoparticles serve as sensitive, high throughput, and portable devices for contactless detecting and manipulating DNAs, RNAs, living cells, and viruses. In this work, we review recent fundamental advances in the field with a focus on biomedical applications. First, we study novel microfluidic-based methods in synthesizing magnetic nanoparticles as well as microparticles encapsulating them. We review both continues-flow and droplet-based microreactors, including the ones based on the cross-flow, co-flow, and flow-focusing methods. Then, we investigate the microfluidic-based methods for manipulating tiny magnetic particles. These manipulation techniques include the ones based on external magnets, embedded micro-coils, and magnetic thin films. Finally, we review techniques invented for the detection and magnetic measurement of magnetic nanoparticles and magnetically labeled bioparticles. We include the advances in anisotropic magnetoresistive, giant magnetoresistive, tunneling magnetoresistive, and magnetorelaxometry sensors. Overall, this review covers a wide range of the field uniquely and provides essential information for designing "lab-on-a-chip" systems for synthesizing magnetic nanoparticles, labeling bioparticles with them, and sorting and detecting them on a single chip.
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Affiliation(s)
- Roozbeh Abedini-Nassab
- Department of Biomedical Engineering, University of Neyshabur, Neyshabur 9319774446, Iran
| | | | - Merivan Şaşmaz
- Department of Electrical and Electronic Engineering, Faculty of Engineering, Adiyaman University, Adiyaman 02040, Turkey;
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Hu X, Torati SR, Kim H, Yoon J, Lim B, Kim K, Sitti M, Kim C. Multifarious Transit Gates for Programmable Delivery of Bio-functionalized Matters. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1901105. [PMID: 31058439 DOI: 10.1002/smll.201901105] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/12/2019] [Indexed: 06/09/2023]
Abstract
Programmable delivery of biological matter is indispensable for the massive arrays of individual objects in biochemical and biomedical applications. Although a digital manipulation of single cells has been implemented by the integrated circuits of micromagnetophoretic patterns with current wires, the complex fabrication process and multiple current operation steps restrict its practical application for biomolecule arrays. Here, a convenient approach using multifarious transit gates is proposed, for digital manipulation of biofunctionalized microrobotic particles that can pass through the local energy barriers by a time-dependent pulsed magnetic field instead of multiple current wires. The multifarious transit gates including return, delay, and resistance linear gates, as well as dividing, reversed, and rectifying T-junction gates, are investigated theoretically and experimentally for the programmable manipulation of microrobotic particles. The results demonstrate that, a suitable angle of the gating field at a suitable time zone is crucial to implement digital operations at integrated multifarious transit gates along bifurcation paths to trap microrobotic particles in specific apartments, paving the way for flexible on-chip arrays of biomolecules and cells.
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Affiliation(s)
- Xinghao Hu
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - Sri Ramulu Torati
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Hyeonseol Kim
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Jonghwan Yoon
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Byeonghwa Lim
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Kunwoo Kim
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
| | - Metin Sitti
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, 70569, Stuttgart, Germany
| | - CheolGi Kim
- Department of Emerging Materials Science, DGIST, Daegu, 42988, Republic of Korea
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Corte-León H, Rodríguez LA, Pancaldi M, Gatel C, Cox D, Snoeck E, Antonov V, Vavassori P, Kazakova O. Magnetic imaging using geometrically constrained nano-domain walls. NANOSCALE 2019; 11:4478-4488. [PMID: 30805582 DOI: 10.1039/c8nr07729k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Magnetic nanostructures, as part of hybrid CMOS technology, have the potential to overcome silicon's scaling limit. However, a major problem is how to characterize their magnetization without disturbing it. Magnetic force microscopy (MFM) offers a convenient way of studying magnetization, but spatial resolution and sensitivity are usually boosted at the cost of increasing probe-sample interaction. By using a single magnetic domain wall (DW), confined in a V-shape nanostructure fabricated at the probe apex, it is demonstrated here that the spatial resolution and the magnetic sensitivity can be decoupled and both enhanced. Indeed, owing to the nanostructure's strong shape anisotropy, DW-probes have 2 high and 2 low magnetic moment states with opposite polarities, characterised by a geometrically constrained pinned DW, and curled magnetization, respectively. Electron holography studies, supported by numerical simulations, and in situ MFM show that the DW-probe state can be controlled, and thus used as a switchable tool with a low/high stray field intensity.
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