Pt/Ru-functionalized magnetic spheres for a magnetic-field stimulated methanol and oxygen redox processes: Towards on-demand activation of fuel cells

2006 ◽  
Vol 8 (7) ◽  
pp. 1106-1110 ◽  
Author(s):  
J WANG ◽  
M MUSAMEH ◽  
R LAOCHAROENSUK ◽  
O GONZALEZGARCIA ◽  
J ONI ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fuel Cells ◽  
Redox Processes ◽  
Magnetic Spheres ◽  
On Demand

scholarly journals Magnetic micropump embedded in contact lens for on-demand drug delivery

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Cong Wang ◽  
Jungyul Park
Keyword(s):  
Magnetic Field ◽  
Drug Delivery ◽  
External Magnetic Field ◽  
Drug Release ◽  
Contact Lens ◽  
Tear Film ◽  
Check Valve ◽  
Drug Diffusion ◽  
On Demand ◽  
The Magnetic Field

AbstractIn this paper, we report a thin magnetic micropump embedded in contact lens, which is capable of on-demand one-directional drug delivery. The proposed micropump can be actuated by the external magnetic field whenever needed without the need of battery. A micro check valve was integrated with the micropump for one-directional drug delivery from the micropump to the post-lens tear film. With actuation of the external magnetic field, the micro check valve is opened, and on-demand drug release can be realized. On the contrary, without an external magnetic field, the micro check valve is closed, and the undesired drug diffusion can be prevented. Through the control of the strength and the frequency of the magnetic field pulse, on-demand drug release and controlled dose can be realized.

MONITORING INTERPARTICLE DISTANCE IN MAGNETORHEOLOGICAL COMPOSITES

2007 ◽  
Vol 21 (28n29) ◽  
pp. 4868-4874
Author(s):  
G. BOSSIS ◽  
E. COQUELLE ◽  
C. NOEL ◽  
F. GIULIERI ◽  
A. M. CHAZE
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Energy Dissipation ◽  
Viscoelastic Properties ◽  
Magnetic Particles ◽  
Interparticle Distance ◽  
Magnetorheological Elastomer ◽  
Magnetorheological Elastomers ◽  
Magnetic Spheres ◽  
The Creation

We describe two different systems, the first one based on a magnetorheological elastomer and the second one on magnetic particles inside a liquid crystal. In both system we manage to have chain structures with particles that are not in contact. The effect of the gap between particles on the viscoelastic properties are studied. We show in particular how in magnetorheological elastomers, the energy dissipation is closely related to the creation and the motion of cavities in the gap between the particles. In liquid crystal chaining of particles can occur without applying a magnetic field. This happens if the anchoring of liquid crystal on the surface of the particles is homeotropic. We demonstrate how the combination of elastic defects and of a magnetic field allow to obtain microscopic springs made of a pair of magnetic spheres.

The effect of magnetic field on the oxygen reduction reaction and its application in polymer electrolyte fuel cells

2003 ◽  
Vol 48 (5) ◽  
pp. 531-539 ◽  
Author(s):  
Tatsuhiro Okada ◽  
Nobuko I. Wakayama ◽  
Liangbi Wang ◽  
Hiroshi Shingu ◽  
Jun-ich Okano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Polymer Electrolyte ◽  
Reduction Reaction ◽  
Polymer Electrolyte Fuel Cells

scholarly journals Magnetoelectric micromachines with wirelessly controlled navigation and functionality

2016 ◽  
Vol 3 (2) ◽  
pp. 113-118 ◽  
Author(s):  
Xiang-Zhong Chen ◽  
Naveen Shamsudhin ◽  
Marcus Hoop ◽  
Roel Pieters ◽  
Erdem Siringil ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Demand Function ◽  
On Demand

A magnetoelectric micromachine manipulated by magnetic field for both locomotion and on-demand function triggering enlighten the concept of unisource-powered microdevices.

scholarly journals On-demand Ferrofluid Droplet Formation With Non-linear Magnetic Permeability in the Presence of a Non-uniform Magnetic Field

2021 ◽  
Author(s):  
Mohamad Ali Bijarchi ◽  
Mohammad Yaghoobi ◽  
Amirhossein Favakeh ◽  
Mohammad Behshad Shafii
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Uniform Magnetic Field ◽  
Maxwell Equations ◽  
Droplet Diameter ◽  
Droplet Formation ◽  
Bond Number ◽  
On Demand ◽  
Drop On Demand ◽  
The Magnetic Field

Abstract The magnetic actuation of ferrofluid droplets offers an inspiring tool in widespread engineering and biological applications. In this study, the dynamics of ferrofluid droplet generation with a Drop-on-Demand feature under a non-uniform magnetic field is investigated by multiscale numerical modeling. Langevin equation is assumed for ferrofluid magnetic susceptibility due to the strong applied magnetic field. Large and small computational domains are considered. In the larger domain, the magnetic field is obtained by solving Maxwell equations. In the smaller domain, a coupling of continuity, Navier Stokes, two-phase flow, and Maxwell equations are solved by utilizing the magnetic field achieved by the larger domain for the boundary condition. The Finite volume method and coupling of level-set and Volume of Fluid methods are used for solving equations. The droplet formation is simulated in a two-dimensional axisymmetric domain. The method of solving fluid and magnetic equations is validated using a benchmark. Then, ferrofluid droplet formation is investigated experimentally and the numerical results are in good agreement with the experimental data. The effect of 12 dimensionless parameters including the ratio of magnetic, gravitational, and surface tension forces, the ratio of the nozzle and magnetic coil dimensions, and ferrofluid to continuous-phase properties ratios are studied. The results showed that by increasing the magnetic Bond number, gravitational Bond number, Ohnesorge number, dimensionless saturation magnetization, initial magnetic susceptibility of ferrofluid, the generated droplet diameter reduces, whereas the formation frequency increases. The same results were observed when decreasing the ferrite core diameter to outer nozzle diameter, density, and viscosity ratios.

Structural remodeling of Ni-based anodes for solid oxide fuel cells via static magnetic field

2020 ◽  
Vol 182 ◽  
pp. 86-89
Author(s):  
Ying Lu ◽  
Jie Hou ◽  
Jun Li ◽  
Xiuan Xi ◽  
Mingming Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Static Magnetic Field ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Structural Remodeling
Sign in / Sign up

Export Citation Format

Share Document