Biomedical Engineering Reference
In-Depth Information
Figure 9.24
Magnitude of the magnetic forces.
9.9 Concentration Approach
In this section, we present another approach to the behavior of magnetic particles.
Particles are no longer considered as discrete entities but rather as a continuous
component in the carrier fluid. The presence of magnetic beads is defined by their
volume concentration
c
equal to the number of particles per unit volume (or moles
per unit volume). In the International System of units
c
is expressed in particles/m
3
.
Because they use very small volumes of liquids, biologists and chemists often use
particles/μl
μ
l or mole/
μ
l.
Figure 9.25
Left: norm of the carrier fluid velocities; right: trajectories of particles through the
bundle. Magnetic particles are primarily captured on the side of the wires facing the external mag-
netic field, some are captured behind, and none are captured on the sides.
