
407Biosensing and Cancer Treatment with Magnetic Nanoparticles
where g(R) is the log normal size distribution, which is given by
gR
R
RR
()
(l
=
÷
-
È
Í
1
0
2
2
ps s
exp
/
(16.12)
where
ln R
0
is the median radius
σ is the standard deviation of ln R
The loss power density P (Wm
−3
) is related to the specic loss power, SLP (Wg
−1
), by the
mean mass density of the particles.
35
The maximum loss power could be reached with
small particles and high frequencies. Here, a typical example for γ-Fe
2
O
3
NP is shown in
Figure 16.6.
Independent of the heating mechanism, the heating efciency of the particles is
quantied in terms of the power of heating of a magnetic material ...