Spatially: resolved heterogeneous dynamics in a strong colloidal gel. (29th April 2015)

• Record Type: Journal Article
• Authors: Buzzaccaro, Stefano; Alaimo, Matteo David; Secchi, Eleonora; Piazza, Roberto
• Is Part Of: Journal of physics. Volume 27:Number 19(2015)
• Publication Date: 2015-04-29
• Subjects: colloidal aggregation -- gels -- dynamic light scattering -- disordered solids -- digital microscopy -- velocimetry -- correlation spectroscopy; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/19/194120
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We re-examine the classical problem of irreversible colloid aggregation, showing that the application of Digital Fourier Imaging (DFI), a class of optical correlation methods that combine the power of light scattering and imaging, allows one to pick out novel useful evidence concerning the restructuring processes taking place in a strong colloidal gel. In particular, the spatially-resolved displacement fields provided by DFI strongly suggest that the temporally-intermittent local rearrangements taking place in the course of gel ageing are characterized by very long-ranged spatial correlations.