Talk (non-conference) (Invited)

FZJ-2015-04828

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Rod-like colloids in external electric fields

Dhont, J. K. G. (Corresponding author)FZJ*

2015

Abstract: Electric fields can induce interactions between charged colloids that lead to the formation of new phases and dynamical states. In this presentation, the phase/state behavior of very long and thin, highly charged rod-like colloids (fd-virus particles) under oscillating external electric fields is discussed. Fd-virus suspensions exhibit an isotropic-nematic phase transition. For concentrations of fd-virus particles within the two-phase isotropic-nematic coexistence region, various field-induced phase transitions and dynamical states are observed, depending on the field-amplitude and frequency. A non-chiral nematic, a chiral nematic, a homeotropically aligned homogeneous phase, and a dynamical state where non-chiral nematic domains persistently melt and form are observed. The molecular origin of the various phases is discussed, and a semi-quantitative theory is presented for the dynamical state.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)

Appears in the scientific report 2015

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