Image time-correlation, dynamic light scattering, and birefringence for the study of the response of anisometric colloids to external fields

Kang, K.

doi:10.1063/1.3589856

Journal Article

Image time-correlation, dynamic light scattering, and birefringence for the study of the response of anisometric colloids to external fields

Kang, K.FZJ*

2011
American Institute of Physics [S.l.]

Review of scientific instruments 82, 053903 (2011) [10.1063/1.3589856]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7315 doi:10.1063/1.3589856

Abstract: In this paper, a detailed description of equipment is given, specially designed to characterize the response of non-spherical colloids to external fields. To characterize slow structural changes on a large length scale we developed an image correlation method, fast dynamics on the colloidal-particle level is probed by means of a vertically mounted, small angle dynamic light scattering setup, while the orientational order (induced by the external field) is measured with a birefringence setup with off-normal incidence. The performance of this in situ set of instruments is illustrated by experiments on concentrated dispersions of very long and thin, charged colloidal rods (fd-virus particles) in external electric fields. Here, the frequency of the field is sufficiently low to polarize electrical double layers, leading to additional inter-colloidal interactions which are found to give rise to phase/state transitions and dynamical states (K. Kang and J. K. G. Dhont, Soft Matter 6, 273, 2010).

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Note: The author thanks Professor J. K. G. Dhont for his scientific interest. This work is partially supported by the EU-FP7 Network "Nanodirect" (Contract No. CP-FP-213948-2).

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