Biomedical Engineering Reference
In-Depth Information
Fig. 6.12
(
a1
-
a2
) SEM images of vaterite islands. (
b
) In situ photographs of vaterite island
domains formed at the liquid-air interface with [CaCO
3
]
D
10 mM, [PAA]
D
40 ppm, mineral-
ization time
48 h: (
b1
) under crossed polarizers, (
b2
) using fluorescence confocal microscope.
(Reproduced from [
89
], Copyright © 2009, American Chemical Society)
D
6.3.3
Transformation of Amorphous Calcium Carbonate Films
In biomimetic approach, calcium carbonate thin film has been obtained using co-
operative interactions between natural/synthetic substrates (collagenous/polyamides
eggshell membrane) and soluble polymeric additives. Aizenberg et al. previously
suggested that the ACC film crystallization process occurs by mass transport
between the amorphous and crystalline [
49
].
The micron-thick crystalline calcium carbonate continuous films can be obtained
by using a simple interfacial configuration based on PAA adsorption at an air-
water interface (Fig.
6.12
)[
89
]. In this system, the formation of large partially
oriented vaterite crystalline domains at the interface is shown to rely on the early
