Magnetically tunable colloidal micromirrors

2016 ◽  
Vol 1 (1) ◽  
pp. 64-68 ◽  
Author(s):  
James Goebl ◽  
Yiding Liu ◽  
Sandy Wong ◽  
Serkan Zorba ◽  
Yadong Yin
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Applied Magnetic Field

Herein we demonstrate a method for decorating highly reflective 2D gold microplates with magnetic nanoparticles to produce an optical colloid that can be actuated using an applied magnetic field.

Magnetic Assistance for Suppressing Cross-Reactions Between Biomolecules in Immunoassay

2010 ◽  
Author(s):  
Chin-Yih Hong ◽  
Shieh-Yueh Yang ◽  
Herng-Er Horng ◽  
Hong-Chang Yang
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Centrifugal Force ◽  
Applied Magnetic Field ◽  
Cross Reactions ◽  
Target Molecules ◽  
The Cross ◽  
Alternative Current ◽  
The Magnetic Field ◽  
Current Magnetic Field

A method involving the use of magnetic nanoparticles to suppress the cross-reactions in immunoassay is developed. Antibodies are coated onto magnetic nanoparticles. These antibodies bind with target and non-target molecules. Once an alternative-current magnetic field is applied, magnetic nanoparticles oscillate with the magnetic field. The target and non-target molecules attached onto magnetic nanoparticles via antibodies experience a centrifugal force, which is against the association between antibodies and target/non-target molecules. Theoretically, the centrifugal force is proportional to the square of the frequency of the applied magnetic field. Thus, the strength of the centrifugal force can be manipulated by changing the frequency of the applied magnetic field. By well controlling the frequency of applied magnetic field, the centrifugal force can be stronger than the binding between antibodies and non-target molecules, but still weaker than that of target molecules. Consequently, the binding between antibodies and non-target molecules is broken by the centrifugal force.

The orientation of the neuronal growth process can be directed via magnetic nanoparticles under an applied magnetic field

2014 ◽  
Vol 10 (7) ◽  
pp. 1549-1558 ◽  
Author(s):  
Cristina Riggio ◽  
M. Pilar Calatayud ◽  
Martina Giannaccini ◽  
Beatriz Sanz ◽  
Teobaldo E. Torres ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Applied Magnetic Field ◽  
Growth Process ◽  
Neuronal Growth

Self assembly of magnetic nanoparticles at silicon surfaces

Soft Matter ◽  
2015 ◽  
Vol 11 (23) ◽  
pp. 4695-4704 ◽  
Author(s):  
Katharina Theis-Bröhl ◽  
Philipp Gutfreund ◽  
Alexei Vorobiev ◽  
Max Wolff ◽  
Boris P. Toperverg ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Applied Magnetic Field ◽  
Self Assembly ◽  
Neutron Reflectometry ◽  
Silicon Surfaces

Neutron reflectometry was used to determine interfacial ordering of ferrofluid particles near a Si surface, under shear, with an applied magnetic field, and without these influences.

scholarly journals Generation of Reverse Meniscus Flow by Applying An Electromagnetic Brake

2021 ◽  
Author(s):  
Alexander Vakhrushev ◽  
Abdellah Kharicha ◽  
Ebrahim Karimi-Sibaki ◽  
Menghuai Wu ◽  
Andreas Ludwig ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Lorentz Force ◽  
Applied Magnetic Field ◽  
Numerical Study ◽  
Flow Direction ◽  
Experimental Studies ◽  
Submerged Entry Nozzle ◽  
Mean Flow ◽  
Slab Caster ◽  
The Mean

AbstractA numerical study is presented that deals with the flow in the mold of a continuous slab caster under the influence of a DC magnetic field (electromagnetic brakes (EMBrs)). The arrangement and geometry investigated here is based on a series of previous experimental studies carried out at the mini-LIMMCAST facility at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The magnetic field models a ruler-type EMBr and is installed in the region of the ports of the submerged entry nozzle (SEN). The current article considers magnet field strengths up to 441 mT, corresponding to a Hartmann number of about 600, and takes the electrical conductivity of the solidified shell into account. The numerical model of the turbulent flow under the applied magnetic field is implemented using the open-source CFD package OpenFOAM®. Our numerical results reveal that a growing magnitude of the applied magnetic field may cause a reversal of the flow direction at the meniscus surface, which is related the formation of a “multiroll” flow pattern in the mold. This phenomenon can be explained as a classical magnetohydrodynamics (MHD) effect: (1) the closure of the induced electric current results not primarily in a braking Lorentz force inside the jet but in an acceleration in regions of previously weak velocities, which initiates the formation of an opposite vortex (OV) close to the mean jet; (2) this vortex develops in size at the expense of the main vortex until it reaches the meniscus surface, where it becomes clearly visible. We also show that an acceleration of the meniscus flow must be expected when the applied magnetic field is smaller than a critical value. This acceleration is due to the transfer of kinetic energy from smaller turbulent structures into the mean flow. A further increase in the EMBr intensity leads to the expected damping of the mean flow and, consequently, to a reduction in the size of the upper roll. These investigations show that the Lorentz force cannot be reduced to a simple damping effect; depending on the field strength, its action is found to be topologically complex.

scholarly journals Stability of nonaxisymmetric ferrofluid flow in rotating cylinders with magnetic field

2005 ◽  
Vol 2005 (23) ◽  
pp. 3727-3737 ◽  
Author(s):  
Jitender Singh ◽  
Renu Bajaj
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Critical Value ◽  
Annular Space ◽  
Rotating Cylinders ◽  
The Stability

Effect of an axially applied magnetic field on the stability of a ferrofluid flow in an annular space between two coaxially rotating cylinders with nonaxisymmetric disturbances has been investigated numerically. The critical value of the ratioΩ∗of angular speeds of the two cylinders, at the onset of the first nonaxisymmetric mode of disturbance, has been observed to be affected by the applied magnetic field.

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