Nanostructured, electroactive and bioapplicable materials

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Figure 5-8. Representative SEM images of mesoporous nanoparticles arrayed
on glass slide by solvent casting at (a) a low magnification, and (b)
a high magnification................................................................................ 148
Figure 6-1. Schematics of biologically templated synthesis of PANI-Colla
complex. .................................................................................................. 170
Figure 6-2. The protonation and redox reactions between the various forms of
polyaniline............................................................................................... 171
Figure 6-3. UV-Vis absorption spectra of chemical polymerized PANI-Colla
complex reaction mixture at day 2 to day 5 (a)-(d), in comparison
with UV-Vis absorption spectrum of PANI polymerized for 5 days
(e). ........................................................................................................... 172
Figure 6-4. Comparison photographs of (a) PANI as-synthesized suspension
and (b) Redispersed PANI in 0.01 M acidic acid vs. (c) PANI-
Colla as-synthesized suspension and (d) PANI redispersed in 0.01
M acidic acid. The PANI as-synthesized reaction mixture (a) is a
slightly brownish green color solution with dark green precipitate.
Dispersion of precipitate of (a) in acidic acid aqueous solution
forms a suspension, which settles in a few minutes. In contrast, the
as-synthesized PANI-Colla (c) is green solution with dark green
precipitate. Re-dispersed in acidic acid aqueous solution under
sonicating, PANI-Colla complex forms green color solution (d). .......... 173
Figure 6-5. FT-IR spectra of (a) collagen, (b) PANI and (c) PANI-Colla
complex. .................................................................................................. 174
Figure 6-6. FT-IR comparison spectra of (a) a physical mixture of polyaniline
and collagen vs (b) PANI-Colla complex. .............................................. 175
Figure 6-7. UV-Vis absorption spectra of PANI-Colla complex in aqueous
solution at various pH: (a) 13.0 (b) 10.5 (c) 6.6 (d) 4.7, and (e)
UV-Vis absorption spectrum of aniline collagen mixture in water
at pH 4.7. ................................................................................................. 176
Figure 6-8. Comparison AFM images of (a) collagen and (b) PANI-Colla
complex. .................................................................................................. 177
Figure 6-9. Comparison images of attachment and differentiation of PC-12
cells on tissue culture dishes coated with (a) PANI-Colla and (b)