12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Nanoscale manipulataion of lamellar copolymers using electric fields.

Presented by Dr. Simiso MKHONTA on 15 Jul 2011 from 08:00 to 08:15
Type: Oral Presentation
Session: CMPMS1
Track: Track A - Condensed Matter Physics and Material Science


<p>Block copolymers can self-assemble into lamellar and cylindrical phases with a fundamental period of 10-100nm. These nanoscopic phases are a basis for a great range of applications in nanotechnology. We describe how electric fields can be utilized to tune the lamellar period of copolymers that consist of liquid-crystal sub-units. Copolymers that are swollen in liquid-crystals have anisotropic chains and liquid-crystals have a dielectric anisotropy. We evaluate the critical electric field required to tilt the liquid-crystal director relative to the lamellar normal in terms of the repulsive interaction between the chemical dissimilar copolymer blocks. We show that the tilting of the liquid-crystal director can lead to an adjustment of the lamellar period with an amplitude that is proportional the chain anisotropy. This reversible tuning of the lamellar period of block copolymers can lead to interesting applications in nanotechnology.

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Room: Parthenon

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