Page 365 - Flexible Robotics in Medicine

Electromechanical characterization of magnetic responsive and conductive 357

1,000
800
600
Magne za on (emu/cm 2 ) –15,000 –10,000 –5,000 –200 0 0 5,000 10,000 15,000 1:1
400
200
1:2
1:3
1:4
–400
–600 1:5
–800
–1,000
Magne c field (Oe)

Figure 15.7
Hysteresis loop for ratio 1:1 1:5.

250
200
150
Magne za on (emu/cm 2 ) –1,500 –1,000 –500 –100 0 0 500 1,000 1,500 1:1
100
50
1:2
1:3
–50
1:4
–150
–200 1:5
–250
Magne c field (Oe)

Figure 15.8
Zoomed in hysteresis loop for ratio 1:1 1:5.

flexibility. The cotton thread with a 1:1 ratio was unable to be attracted to the magnet,
while the cotton thread with a 1:5 ratio can be attracted (Fig. 15.9). Evidently, the
concentration of Fe 3 O 4 NPs is too low for the cotton thread with a 1:1 ratio, which explains
why it cannot be attracted by the magnet. However, for an even stronger attraction toward
the magnet, ratios higher than 1:5 can be used to coat the cotton thread. This ability
promotes the application of these fibers in wearable devices and magnetic actuators.