Biomedical Engineering Reference
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Figure 2a
Figure 2b
The variation of ε' with respect to the frequency for various temperatures for starch
stored at 75% humidity is as shown in Figure 3a and 3b. The value of the dielectric
constant for any given temperature or frequency for starch in 75% humidity is larger
than that for dry starch or for starch in 51% humidity. The dielectric values increases
rapidly with increasing temperatures at low frequencies. It has very high values (~
10
5
) at low frequencies and high temperatures due to electrode polarization. Also, the
curves have almost the same value at high temperatures indicating the loss of water at
higher temperatures.
Figure 3a
Figure 3b
dielectric loss as a Function of Water Content
The variation of the dielectric loss (ε'') as a function of frequency for various tempera-
tures for starch in 0% humidity is shown in
Figure 4a
and 4b. At low temperature, it
is observed that a very prominent relaxation is observed with its frequency maxima
increasing in its intensity and position as the temperature increases from -100 to 0°C.
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