# Local elastic response measured near the colloidal glass transition.

@article{Anderson2013LocalER, title={Local elastic response measured near the colloidal glass transition.}, author={D. Anderson and David Schaar and Hilary G. E. Hentschel and J. C. Van Hay and Piotr Habdas and Eric R. Weeks}, journal={The Journal of chemical physics}, year={2013}, volume={138 12}, pages={ 12A520 } }

We examine the response of a dense colloidal suspension to a local force applied by a small magnetic bead. For small forces, we find a linear relationship between the force and the displacement, suggesting the medium is elastic, even though our colloidal samples macroscopically behave as fluids. We interpret this as a measure of the strength of colloidal caging, reflecting the proximity of the samples' volume fractions to the colloidal glass transition. The strain field of the colloidal…

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