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Biosensors Based on Nanomaterials and Nanodevices
book

Biosensors Based on Nanomaterials and Nanodevices

by Jun Li, Nianqiang Wu
December 2017
Intermediate to advanced content levelIntermediate to advanced
517 pages
21h 5m
English
CRC Press
Content preview from Biosensors Based on Nanomaterials and Nanodevices
402 Biosensors Based on Nanomaterials and Nanodevices
moment. Superparamagnetism is useful in biomedical applications because as the applied
magnetic eld is removed, magnetization disappears then there will be no agglomeration
of NPs. The superparamagnetic behavior can be characterized in terms of a relaxation
time, τ, which is the time it takes for the system to achieve zero magnetization after the
removal of the external magnetic eld. The relaxation time, τ, for a particle is given by the
Néel expression:
17
tt=
Ê
Ë
Á
ˆ
¯
˜
0
exp
DE
kT
B
(16.2)
where τ
0
is the characteristic time of the order 10
−10
to 10
−12
s for non-reacting particles and
weakly depends ...
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Publisher Resources

ISBN: 9781466551527