Biomedical Engineering Reference
In-Depth Information
10
0
(a)
Au
Cr
10
-1
mica
10
-2
10
-3
10
-4
10
-5
(b)
PMPC
10
-1
10
-2
mica
10
-3
10
-4
10
-5
(c)
DPPC
10
-1
10
-2
10
-3
10
-4
10
-5
10
-6
0.00
mica
0.20
0.25
0.30
0.05
0.10
0.15
Q
(å
-1
)
FIGURE 13.16
Reflectivity versus momentum transfer
Q
=(4
π
/
λ
) sin
for three nanofilms
on mica in air, as schematically illustrated in the insets: (a)
θ
∼
5nm
Au and
20 nm Cr thermally evaporated on plasma treated mica in
high vacuum; (b)
∼
28 nm surface grown zwitterionic polymer brush
pMPC (poly (2-methacryloyloxyethyl phosphorylcholine)); and (c) a
∼
2.5 nm
DPPC (1,2-dipalmitoylphosphatidylcholine) phospholipid Langmuir-Blodgett
(monolayer) deposited on mica. The open circles are the experimental data,
and the gray solid curves are computed using the fitting parameters reported
by Briscoe et al. (Reprinted from Briscoe, W.H., Chen, M., Dunlop, I.E.,
Klein, J., Penfold, J., and Jacobs, R.M.J.,
J. Coll. Inter. Sci.
, 306, 2007.
With permission from Elsevier.)
∼
The rapid advancement in the x-ray spectroscopic techniques can compli-
ment ellipsometric techniques to provide a wide range of information regard-
ing chemical and physical properties of thin films and porous media, offering
a unique approach for
in situ
, noninvasive characterizations.
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