Effect of Applied Magnetic Field on Anodic Oxidization of Aluminum for High-Aspect-Ratio Microfabrication

2007 ◽  
Vol 5 (1) ◽  
pp. 293-295 ◽  
Author(s):  
M. Takezawa ◽  
T. Imagawa ◽  
J. Yamasaki ◽  
M. Yagi
Keyword(s):  
Magnetic Field ◽  
Aspect Ratio ◽  
Applied Magnetic Field ◽  
High Aspect Ratio

Numerical Simulation of High-Aspect-Ratio Micro-Hole Electroforming with External Magnetic Field

2010 ◽  
Vol 42 ◽  
pp. 13-16
Author(s):  
Wei Li ◽  
Ping Mei Ming ◽  
Wu Ji Jiang ◽  
Yin Ding Lv
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Flow State ◽  
Cathode Electrode ◽  
Micro Hole ◽  
Fluent Software ◽  
The Magnetic Field ◽  
Enhance Mass

In this paper, the influences of applied magnetic field on flow state during electroforming of the high-aspect-ratio (HAR) blind micro-hole were numerically analyzed using the Fluent software. The results showed that, when microelectroforming of nickel without external agitation, three vortexes could form due to the magnetohydrodynamic (MHD) effect within the HAR micro-hole with magnetic field in parallel to cathode-electrode surface, and the flow rate in the micro-hole increased with the increase of the magnetic field and current density. The MHD effect helped to enhance mass transfer during the microelectroforming of HAR microstructures.

Effect of Inductively Coupled Electro-Magnetic Field on Bottom Oxide Etch in a High Aspect Ratio Trench

2020 ◽  
Vol 97 (3) ◽  
pp. 3-9
Author(s):  
Stefano Sardo ◽  
Antonio Palombizio ◽  
Manuel Mannarino ◽  
Augusto Redolfi ◽  
Luc Haspeslagh
Keyword(s):  
Magnetic Field ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Inductively Coupled ◽  
Electro Magnetic Field ◽  
Electro Magnetic

Fabricating and Tailoring Polyaniline (PANI) Nanofibers with High Aspect Ratio in a Low-Acid Environment in a Magnetic Field

2015 ◽  
Vol 11 (1) ◽  
pp. 93-101 ◽  
Author(s):  
Yong Ma ◽  
Yanhui Chen ◽  
Ang Mei ◽  
Mingtao Qiao ◽  
Chunping Hou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Pani Nanofibers ◽  
Acid Environment

Effect of Inductively Coupled Electro-Magnetic Field on Bottom Oxide Etch in a High Aspect Ratio Trench

2020 ◽  
Vol MA2020-01 (22) ◽  
pp. 1289-1289
Author(s):  
Stefano Sardo ◽  
Antonio Palombizio ◽  
Manuel Mannarino ◽  
Augusto Redolfi ◽  
Luc Haspeslagh
Keyword(s):  
Magnetic Field ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Inductively Coupled ◽  
Electro Magnetic Field ◽  
Electro Magnetic

scholarly journals Magnetic microparticle concentration and collection using a mechatronic magnetic ratcheting system

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246124
Author(s):  
Oladunni B. Adeyiga ◽  
Coleman Murray ◽  
Hector E. Muñoz ◽  
Alberto Escobar ◽  
Dino Di Carlo
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Concentration Factor ◽  
Magnetic Particles ◽  
Superparamagnetic Iron Oxide ◽  
Iron Oxide Particles ◽  
Superparamagnetic Iron Oxide Particles ◽  
Oxide Particles

Magnetic ratcheting cytometry is a promising approach to separate magnetically-labeled cells and magnetic particles based on the quantity of magnetic material. We have previously reported on the ability of this technique to separate magnetically-labeled cells. Here, with a new chip design, containing high aspect ratio permalloy micropillar arrays, we demonstrate the ability of this technique to rapidly concentrate and collect superparamagnetic iron oxide particles. The platform consists of a mechatronic wheel used to generate and control a cycling external magnetic field that impinges on a “ratcheting chip.” The ratcheting chip is created by electroplating a 2D array of high aspect ratio permalloy micropillars onto a glass slide, which is embedded in a thin polymer layer to create a planar surface above the micropillars. By varying magnetic field frequency and direction through wheel rotation rate and angle, we direct particle movement on chip. We explore the operating conditions for this system, identifying the effects of varying ratcheting frequency, along with time, on the dynamics and resulting concentration of these magnetic particles. We also demonstrate the ability of the system to rapidly direct the movement of superparamagnetic iron oxide particles of varying sizes. Using this technique, 2.8 μm, 500 nm, and 100 nm diameter superparamagnetic iron oxide particles, suspended within an aqueous fluid, were concentrated. We further define the ability of the system to concentrate 2.8 μm superparamagnetic iron oxide particles, present in a liquid suspension, into a small chip surface area footprint, achieving a 100-fold surface area concentration, and achieving a concentration factor greater than 200%. The achieved concentration factor of greater than 200% could be greatly increased by reducing the amount of liquid extracted at the chip outlet, which would increase the ability of achieving highly sensitive downstream analytical techniques. Magnetic ratcheting-based enrichment may be useful in isolating and concentrating subsets of magnetically-labeled cells for diagnostic automation.

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