Biomedical Engineering Reference
In-Depth Information
(i)
NH
2
(ii)
Si
N
OO
O
O
Si
Si
N
H
O
H
O
O
H
O
H
H
H
H
H
O
O
O
O
O
(a)
(iii)
(i)
N
O
Si
O
NH
2
NH
2
O
NH
2
H
Si
O
O
N
O
O
Si
H
Si
Si
O
O
H
(ii)
O
O
O
O
(b)
O
O
O
O
O
O
Si
Si
N
N
H
H
H
H
H
H
O
O
O
O
(c)
FIGURE 11.24
Schematic representation of the structure of APTES after various deposition conditions.
Microscopic orientation is indicated on the left side of the fi gure. A schematic, not-to-scale diagram of macro-
scopic orientation is on the right side, showing the underlying solid surface, APTES monolayers (each about
0.7 nm thick), and APTES aggregates (10s to 100s of nanometers thick). (a) Deposition from toluene without
curing: (i) reaction time of minutes at room temperature, (ii) reaction time of hours at room temperature, and
(iii) reaction time of hours under refl ux. (b) Refl uxed deposition from toluene-RT with curing: (i) reaction
time of minutes and (ii) reaction time of hours. (c) Deposition from water without curing. Adapted from [56].
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