The spatial fluctuations of the dynamics of a colloidal system composed of nanoparticles are probed by a novel experimental setup, which combines homodyne and heterodyne dynamic light scattering focused onto a micron-sized volume via a microscope objective. The technique is used to measure the four-point susceptibility of an aging colloidal suspension, revealing a breakdown of the Gaussian approximation for the correlation function of the scattered electromagnetic field. The deviation from the Gaussian approximation increases with waiting time as the system evolves toward an arrested phase, signaling the gradual emergence of higher-order nontrivial dynamic correlations.

Measurement of the Four-Point Susceptibility of an Out-of-Equilibrium Colloidal Solution of Nanoparticles Using Time-Resolved Light Scattering / Maggi, Claudio; DI LEONARDO, Roberto; Ruocco, Giancarlo; Jeppe C., Dyre. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:9(2012), p. 097401. [10.1103/physrevlett.109.097401]

Measurement of the Four-Point Susceptibility of an Out-of-Equilibrium Colloidal Solution of Nanoparticles Using Time-Resolved Light Scattering

MAGGI, CLAUDIO;DI LEONARDO, ROBERTO;RUOCCO, Giancarlo;
2012

Abstract

The spatial fluctuations of the dynamics of a colloidal system composed of nanoparticles are probed by a novel experimental setup, which combines homodyne and heterodyne dynamic light scattering focused onto a micron-sized volume via a microscope objective. The technique is used to measure the four-point susceptibility of an aging colloidal suspension, revealing a breakdown of the Gaussian approximation for the correlation function of the scattered electromagnetic field. The deviation from the Gaussian approximation increases with waiting time as the system evolves toward an arrested phase, signaling the gradual emergence of higher-order nontrivial dynamic correlations.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the Four-Point Susceptibility of an Out-of-Equilibrium Colloidal Solution of Nanoparticles Using Time-Resolved Light Scattering / Maggi, Claudio; DI LEONARDO, Roberto; Ruocco, Giancarlo; Jeppe C., Dyre. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:9(2012), p. 097401. [10.1103/physrevlett.109.097401]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/645299
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