Observation of Strongly Heterogeneous Dynamics at the Depinning Transition in a Colloidal Glass.

We study experimentally the origin of heterogeneous dynamics in strongly driven glass-forming systems. Thereto, we apply a well-defined force with a laser line trap on individual colloidal polystyrene probe particles seeded in an emulsion glass composed of droplets of the same size. Fluid and glass states can be probed. We monitor the trajectories of the probe and measure displacements and their distributions. Our experiments reveal intermittent dynamics around a depinning transition at a threshold force. For smaller forces, linear response connects mean displacement, and quiescent mean squared displacement. Mode coupling theory calculations rationalize the observations.

[1]  T. Franosch,et al.  Anomalous transport in the crowded world of biological cells , 2013, Reports on progress in physics. Physical Society.

[2]  Field-induced superdiffusion and dynamical heterogeneity. , 2016, Physical review. E.

[3]  Active microrheology in active matter systems: Mobility, intermittency, and avalanches. , 2014, Physical review. E, Statistical, nonlinear, and soft matter physics.

[4]  C. Reichhardt,et al.  Fluctuations, jamming, and yielding for a driven probe particle in disordered disk assemblies. , 2009, Physical review. E, Statistical, nonlinear, and soft matter physics.

[5]  S. Granick,et al.  Bursts of active transport in living cells. , 2011, Physical review letters.

[6]  J. P. Garrahan,et al.  Negative differential mobility of weakly driven particles in models of glass formers. , 2008, Physical review. E, Statistical, nonlinear, and soft matter physics.

[7]  K. Binder,et al.  Active nonlinear microrheology in a glass-forming Yukawa fluid. , 2012, Physical review letters.

[8]  H. Risken.  Fokker-Planck Equation , 1996 .

[9]  J. Arlt,et al.  Passive and active microrheology of hard-sphere colloids. , 2009, The journal of physical chemistry. B.

[10]  T. Waigh.  Microrheology of complex fluids , 2005 .

[11]  R. Candelier,et al.  Creep motion of an intruder within a granular glass close to jamming. , 2009, Physical review letters.

[12]  Thomas de Quincey.  [C] , 2000, The Works of Thomas De Quincey, Vol. 1: Writings, 1799–1820.

[13]  Wu,et al.  Nonergodicity and light scattering from polymer gels. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[14]  J. Lippincott-Schwartz,et al.  High-density mapping of single-molecule trajectories with photoactivated localization microscopy , 2008, Nature Methods.

[15]  Denis Wirtz,et al.  Particle Tracking Microrheology of Complex Fluids , 1997 .

[16]  J. Herskowitz,et al.  Proceedings of the National Academy of Sciences, USA , 1996, Current Biology.

[17]  A. Heuer,et al.  Anomalous diffusion of driven particles in supercooled liquids. , 2012, Physical review letters.

[18]  Kenneth W. Desmond,et al.  Influence of particle size distribution on random close packing of spheres. , 2013, Physical review. E, Statistical, nonlinear, and soft matter physics.

[19]  David G Grier,et al.  Giant colloidal diffusivity on corrugated optical vortices. , 2006, Physical review letters.

[20]  Eric R Weeks,et al.  The physics of the colloidal glass transition , 2011, Reports on progress in physics. Physical Society.

[21]  F. Scheffold,et al.  Dynamical and structural signatures of the glass transition in emulsions , 2016, 1605.01917.

[22]  Nearly logarithmic decay in the colloidal hard-sphere system. , 2005, Physical review. E, Statistical, nonlinear, and soft matter physics.

[23]  Stephen R. Williams,et al.  Measurement of the self-intermediate scattering function of suspensions of hard spherical particles near the glass transition , 1998 .

[24]  J. Horbach,et al.  Nonlinear active micro-rheology in a glass-forming soft-sphere mixture. , 2013, The Journal of chemical physics.

[25]  M. Mézard,et al.  Journal of Statistical Mechanics: Theory and Experiment , 2011 .

[26]  Michael Engel,et al.  Band gap formation and Anderson localization in disordered photonic materials with structural correlations , 2017, Proceedings of the National Academy of Sciences.

[27]  A. Comtet,et al.  Classical diffusion of a particle in a one-dimensional random force field , 1990 .

[28]  O. Bénichou,et al.  Geometry-induced superdiffusion in driven crowded systems. , 2013, Physical review letters.

[29]  Tejraj M. Aminabhavi,et al.  Density, Viscosity, Refractive Index, and Speed of Sound in Aqueous Mixtures of N,N-Dimethylformamide, Dimethyl Sulfoxide, N,N-Dimethylacetamide, Acetonitrile, Ethylene Glycol, Diethylene Glycol, 1,4-Dioxane, Tetrahydrofuran, 2-Methoxyethanol, and 2-Ethoxyethanol at 298.15 K , 1995 .

[30]  Schofield,et al.  Three-dimensional direct imaging of structural relaxation near the colloidal glass transition , 2000, Science.

[31]  Todd M. Squires,et al.  Fluid Mechanics of Microrheology , 2010 .

[32]  E. Weeks,et al.  In search of colloidal hard spheres , 2012, 1205.6665.

[33]  T. Franosch,et al.  Time-Dependent Fluctuations and Superdiffusivity in the Driven Lattice Lorentz Gas. , 2017, Physical review letters.

[34]  John F. Brady,et al.  Anomalous diffusion in heterogeneous porous media , 1988 .

[35]  E. Corwin,et al.  Structure of marginally jammed polydisperse packings of frictionless spheres. , 2014, Physical review. E, Statistical, nonlinear, and soft matter physics.

[36]  Shankar Ghosh,et al.  A high-precision study of hindered diffusion near a wall , 2010 .

[37]  M. Wördemann.  Structured Light Fields , 2012 .

[38]  A. Puertas,et al.  Active microrheology in a colloidal glass. , 2016, Physical review. E.

[39]  I. Gazuz,et al.  Active and nonlinear microrheology in dense colloidal suspensions. , 2008, Physical review letters.

[40]  P. Alam.  ‘S’ , 2021, Composites Engineering: An A–Z Guide.

[41]  L. Pontani,et al.  Microscopic approach to the nonlinear elasticity of compressed emulsions. , 2012, Physical review letters.

[42]  J. Crocker,et al.  ENTROPIC ATTRACTION AND REPULSION IN BINARY COLLOIDS PROBED WITH A LINE OPTICAL TWEEZER , 1999 .

[43]  Stephen R. Williams,et al.  Linear response domain in glassy systems. , 2006, Physical review letters.

[44]  Andrea J. Liu,et al.  The Jamming Transition and the Marginally Jammed Solid , 2010 .