Experimental study of out of equilibrium fluctuations in a colloidal suspension of Laponite using optical traps

Abstract

This work is devoted to the study of displacement fluctuations of micron-sized particles in an aging colloidal glass. We address the issue of the validity of the fluctuation dissipation theorem (FDT) and the time evolution of viscoelastic properties during aging of aqueous suspensions of a clay (Laponite RG) in a colloidal glass phase. Given the conflicting results reported in the literature for different experimental techniques, our goal is to check and reconcile them using \emph{simultaneously} passive and active microrheology techniques. For this purpose we measure the thermal fluctuations of micro-sized brownian particles immersed in the colloidal glass and trapped by optical tweezers. We find that both microrheology techniques lead to compatible results even at low frequencies and no violation of FDT is observed. Several interesting features concerning the statistical properties and the long time correlations of the particles are observed during the transition.

References in corpus (10)

• Work fluctuation theorems for harmonic oscillators
• Multiple nonergodic disordered states in Laponite suspensions: a phase diagram
• Fluctuation theorems for harmonic oscillators
• Experimental evidence of non-Gaussian fluctuations near a critical point
• Work and dissipation fluctuations near the stochastic resonance of a colloidal particle
• Measurement of Effective Temperatures in an Aging Colloidal Glass
• Probability density functions of work and heat near the stochastic resonance of a colloidal particle
• Effective temperatures from the fluctuation-dissipation measurements in soft glassy materials
• Equivalence of driven and ageing fluctuation-dissipation relations in the trap model
• Effective Temperature in a Colloidal Glass

Cited by in corpus (12)

• Theoretical perspective on the glass transition and amorphous materials
• The effective temperature
• Experimental verification of a modified fluctuation-dissipation relation for a micron-sized particle in a non-equilibrium steady state
• Microstructure and Soft Glassy Dynamics of Aqueous Laponite Dispersion
• Fluctuations in out of equilibrium systems: from theory to experiment
• Non-conservative forces and effective temperatures in active polymers
• A statics-dynamics equivalence through the fluctuation-dissipation ratio provides a window into the spin-glass phase from nonequilibrium measurements
• Experimental Evidence of Fluctuation-Dissipation Theorem Violation in a Superspin Glass
• The role of non-conservative scattering forces and damping on Brownian particles in optical traps
• Correlating microscopic viscoelasticity and structure of an aging colloidal gel using active microrheology and cryogenic scanning electron microscopy
• Probing the Fluctuation-Dissipation Theorem in a Perrin-like Experiment
• Steady state of overdamped particles in the non-conservative force field of a simple non-linear model of optical trap