Abstract
We have investigated the optical properties of colloidal crystals grown in confined parallel plate geometry and subjected to an alternating square wave electric field. A transient increase in the Bragg-scattering intensity was observed upon each reversal of the field direction. Careful analysis of the full 2D flow profile showed that this effect could be attributed to a change of the strain direction in the crystals connected with the changed flow direction in the crystals. Friction at the external wall and intrinsic friction in connection with electro-osmotic flow are discussed as underlying reasons of the observed shear flow.
Acknowledgements We thank BASF, Ludwigshafen, Germany, for the kind gift of PnBAPS68. Financial Support of the DFG (SFB TR6, Pa459/11-1) and the Materialwissenschaftliches Forschungszentrun, Mainz are gratefully acknowledged.
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Medebach, M., Palberg, T. Flashing of colloidal crystals in square wave electric fields. In: Miguel, M., Burrows, H. (eds) Trends in Colloid and Interface Science XVI. Progress in Colloid and Polymer Science, vol 123. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-36462-7_56
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DOI: https://doi.org/10.1007/978-3-540-36462-7_56
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