Dear Lin,
I have suggestions:
Micelles should (theoretically) form above the CMC. So if you want a micelle,
the concentration should be >>CMC
I suggest that you find the CMC experimentally, then convert the concentration
to nm^3 (let say: mv/1000nm^3)
The number of molecules should be able to obtained by multiplying with Avogadro
number: (6.023x10^23). If your system contain co-surfactant, then you'll need
to get the experimetal CMC for at least one of the two surfactants (if both
non-ionic..if not you'll need the activity coefficient for each
surfactant).Take a look at this paper:
Bourov G. K. and Bhattacharya A., Brownian dynamics of mixed surfactant
micelles, Journal of Chemical Physics, 123 (2005) 204712(1)-204712(6)
How long 600 ps simulation is depends on your system size, box type, parameters
and computational power (see manual).
One other way to KNOW the surfactants formed micelle is by measuring the
surface tension (use g_energy). But g_energy gives surface*surface tension
value, so you'll need to work on that. (HINT: Surface tension value drop
drastically at CMC)
Hope these helps,
Muhammad Alif Mohammad Latif
Department of Chemistry
Faculty of Science
Universiti Putra Malaysia
43400 UPM Serdang, Selangor
MALAYSIA
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