This title appears in the Scientific Report :
2015
Rod-like colloids in external electric fields
Rod-like colloids in external electric fields
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 di...
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Personal Name(s): | Dhont, Jan K.G. (Corresponding author) |
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Contributing Institute: |
Weiche Materie; ICS-3 |
Imprint: |
2015
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Conference: | Institutsseminar, CPG, Vienna (Austria), 2015-06-23 - 2015-06-23 |
Document Type: |
Talk (non-conference) |
Research Program: |
Functional Macromolecules and Complexes |
Publikationsportal JuSER |
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. |