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Self-Assembly in Non-Polar Media q Ruckenstein, E.; Nagarajan, R. Aggregation of Amphiphiles in
Non-Aqueous Media. Journal
of Physical Chemistry 84, 1349-1358 (1980).
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Schematic of Aggregates in Non-Polar Media |
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The surfactant head group is a dipole and is represented
by the arrow. The direction of the
arrow denotes the orientation of the dipoles. The surfactants are organized
into string-like and tube-like linear aggregates and disc-like
two-dimensional aggregates with compact arrangement of dipoles. The arrow denotes the two charges on the
dipole separated by the distance d.
The linear distance between two nearest dipoles in the assembly is
denoted as d. Also shown are the surfactant tails attached
to the dipolar head groups. |
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Computed Contributions to Free Energy of Aggregation Based on the Molecular Theory |
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Dipole-dipole interaction free energy is negative. Constitutes the d Steric interactions between the tails are positive. Contribute to limiting the growth of
aggregates. Tail mixing with solvent
contributions are positive. Also contribute to limiting the growth of
aggregates. No pronounced minimum in the total free energy. |
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