Biomedical Engineering Reference
In-Depth Information
First, noting that platinum reduction is carried out in a wet batch system, repet-
itive platinum reduction steps (Asaka et al., 1995; Onishi et al., 2000) were found
to be effective to produce IPMNCs exhibiting larger force characteristics. It is our
belief that increased platinum concentration within the polymer leads to higher
double layer charge capacity. Figures 3.26(a) and 3.26(b) present the electric power
consumption and current/voltage (I/V) behavior under a sinusoidal wave input to an
400
After 1st reduction
After 5th reduction
After gold plating (5-0-1)
Pure Nafion
TM
-117 (wet)
300
200
100
0
−
100
0
1
2
3
4
5
T (sec)
FIGURE 3.26
(a)
Power consumption of IPMNC versus time. Note that the platinum reduc-
tion was completed five times and final electroplating was done with gold. Also, phase shifts
can be seen as the platings proceed.
150
After gold plating
After 5th reduction
After 1st reduction
100
Bare Nafion-117
(no pt)
50
0
−
50
−
100
−
150
−
3
−
2
−
1
0
1
2
3
E
app
(V)
FIGURE 3.26
(b)
Current/voltage characteristics of IPMNC. Note that the platinum reduc-
tion was completed five times and final electroplating was done with gold. Also, phase shifts
can be seen as the platings proceed.
