Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00027 : Magnetic fields for the long-range ordering of amphiphilic block copolymers and surfactant mesophases
Author:
We present a diamagnetic interactions-based approach to impose
long range
order in self-assembled soft materials. We discuss two chemically
different
systems which have been successfully aligned with the use of a
magnetic
field. The orientation and the degree of alignment are quantified by
small-angle X-ray scattering, polarized optical microscopy and
electrical
impedance spectroscopy. We focus on Li ion-conducting liquid
crystalline
diblock copolymers. Our technique allows us to control the
orientation of
hexagonally packed PEO channels within a non-conducting liquid
crystalline
matrix that is responsive to the field. The electrical
conductivity of the
cylindrical samples with PEO domains aligned perpendicular to
electrodes is
an order of magnitude greater than for samples featuring randomly
orientated
domains. Our second system consists of non-ionic surfactants forming
lamellar or cylindrical mesophase in water. The method which we term
``rotational annealing'', is successfully used to obtain highly
ordered
mesophases which can be further utilized as a template for
nanomaterials
synthesis.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.27
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