Biomedical Engineering Reference
In-Depth Information
nan9-pan01 1.0 kV 10.5 mm
×
250 SE(M) 5/31/02
200 um
FIGURE 4.30
Thin wires used as effective spring electrode.
Electric voltage
Activated PAN
hin wire spring electrode
Membrane electrode
Aqueous solution
V
FIGURE 4.31
A PAN electrification configuration using a thin wire electrode and counter-
membrane electrode.
N
KOH—were placed in 0.5
N
HCl) and measured. Also, this process was repeated
using NaOH and LiOH for the boiling and alkaline-soaking media.
The PAN fibers, regardless of whether activated in KOH, NaOH, or LiOH,
increased from their 1-in. initial length after being activated and soaked in distilled
water. Lengths then decreased after the fibers were soaked in the bases. When the
fibers were again soaked in distilled water, their lengths generally increased back to
the original distilled water lengths.
The fibers soaked in NaOH were the exception to this because they did not
generally reach their previous distilled-water lengths. When the fibers were soaked
in HCl, there was a much greater decrease in length than occurred with the alkaline
media (see figs. 4.26 through 4.29 and tables 4.1 through 4.3 for exact lengths
and trends).
