softmatter:Lamella

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Lamella formed from tethered nanosphere system
Lamella formed from tethered nanosphere system

Block Copolymers (BCPs) and surfactants are known to phase separate into complex morphologies including Cubically Ordered Spherical Micelles, Hexagonally Packed Cylindrical Micelles, Double Gyroid, Perforated Lamella, and Lamella. Recent simulation results have shown that Tethered building blocks also can exhibit similar phases as a result of microphase separation.

Contents

Block Copolymers

Melts of BCPs, with block fractions of ~0.35-0.65 have been shown to form cylindrical micelles that order into hexagonal arrangements [1]. Here block fraction is defined as (length of the A block)/(total length of polymer).

Surfactants

Simulations of symmetric surfactants in selective solvent have also yielded lamella for volume fractions of approximately 0.4 - 0.5 [2].

Tethered Particles

Tether-aggregating tethered nanospheres (TNS) were found to exhibit lamella for a range of volume fractions and various excluded volume ratio, Fv, values (ratio of the nanoparticle to tether) [2].

Examples

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