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the metal ion concentration used in the synthesis, we can calculate
the total mass of the nanoparticles assuming a 100% conversion,
[
M
]
100%
. The actual mass of nanoparticles, [
M
]
exp
, can then be
determined by acid-dissolution of a known aliquot followed by ASV
analysis, having plotted a calibration curve for that metal ion. The
recovery isobviously [
M
]
exp
/
[
M
]
100%
.
Nanoparticle stock concentration
The total number of nanoparti-
cles isgiven by
mass ofmetal ion used in synthesis
x
massof 1 particle
×
recovery
=
no. ofparticles
From the volume used in the synthesis this can be converted to a
concentration of nanoparticles mL
−
1
.
Capsule/latex concentration.
A TEM image of some (PAH/PSS)
4
capsules is shown in Fig. 8.10a, and a sub-micron PSA latex particle
shown in Fig. 8.13. The mass of one capsule or particle can be
calculatedfromtheshellorparticledimensions,assumingadensity
of 1.01 g cm
−
3
for the capsule and 1.05 g cm
−
3
for the particle [55].
Figure 8.13.
TEM image of 493 nm diameter PSA particle. Taken with
permission from [131], S. Pinijsuwan, P. Rijiravanich, M. Somasundrum,
and W. Surareungchai,
Anal. Chem
.
80
, 6779-6784 (2008). Supporting
Information. c
American Chemical Society.
