Journal ArticleDOI
Use of dynamic schlieren interferometry to study fluctuations during free diffusion.
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A form of schlieren interferometry is used to measure the mean-squared amplitude and temporal autocorrelation function of concentration fluctuations driven by the presence of a gradient during the free diffusion of a urea solution into water.Abstract:
We used a form of schlieren interferometry to measure the mean-squared amplitude and temporal autocorrelation function of concentration fluctuations driven by the presence of a gradient during the free diffusion of a urea solution into water. By taking and processing sequences of images separated in time by less than the shortest correlation time of interest, we were able to simultaneously measure dynamics at a number of different wave vectors. The technique is conceptually similar to the shadowgraph method, which has been used to make similar measurements, but the schlieren method has the advantage that the transfer function is wave-vector independent rather than oscillatory.read more
Citations
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Journal ArticleDOI
Confinement effect on the dynamics of non-equilibrium concentration fluctuations far from the onset of convection.
Cédric Giraudet,Henri Bataller,Yifei Sun,Aleksandar Donev,José M. Ortiz de Zárate,Fabrizio Croccolo,Fabrizio Croccolo +6 more
TL;DR: In the new experiments presented here, the magnitude of the temperature gradient is changed, confirming that the system is controlled solely by the solutal Rayleigh number, and that the slowing-down is dominated by a combined effect of the driving force of buoyancy, the dissipating force of diffusion and the confinement provided by the vertical extension of the sample cell.
Journal ArticleDOI
Giant Fluctuations Induced by Thermal Diffusion in Complex Liquids
Alberto Vailati,Philipp Baaske,Henri Bataller,Serena Bolis,Marco Braibanti,Marina Carpineti,Roberto Cerbino,Fabrizio Croccolo,Jean Luc Dewandel,Aleksandar Donev,L. García-Fernández,L. García-Fernández,Fabio Giavazzi,Robert Haslinger,Steven Hens,Maria Knauer,Werner Köhler,Ewald Kufner,José M. Ortiz de Zárate,J. Peeters,Christian J. Schwarz,Inese Silkina,Shenghua Xu,Daniel Zapf +23 more
TL;DR: In this paper, a shadowgraph optical instrument is used to study non-equilibrium fluctuations during diffusive processes occurring in complex multi-component mixtures, where one of the components is a macromolecule, such as a polymer, a colloid or a protein.
Journal ArticleDOI
Dynamic shadowgraph experiments and image processing techniques for investigating non-equilibrium fluctuations during free diffusion in nanocolloids
Ana Oprisan,Alexis Payne +1 more
TL;DR: In this article, small angle light scattering (SALS) experiments were performed to investigate the crossover between viscosity and concentration-driven non-equilibrium fluctuations in colloidal systems.
Journal ArticleDOI
Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures
Pablo Martínez Pancorbo,Pablo Martínez Pancorbo,José M. Ortiz de Zárate,Henri Bataller,Fabrizio Croccolo,Fabrizio Croccolo +5 more
TL;DR: It is found that the autocorrelation matrix of concentration fluctuations can be expressed as the sum of two exponentially decaying concentration modes, which, as a consequence of gravity, display a wave-number-dependent mixing.
Journal ArticleDOI
Coupled non-equilibrium fluctuations in a polymeric ternary mixture
L. García-Fernández,L. García-Fernández,P. Fruton,Henri Bataller,J. M. Ortiz de Zárate,Fabrizio Croccolo +5 more
TL;DR: A more complete theoretical model is presented to describe the non-equilibrium fluctuations in the bulk of a ternary mixture at the steady state of a thermodiffusion experiment, which reveals the existence of quite different decay times, thus requiring the analysis of a wide range of correlation times.
References
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
Book
Dynamic Light Scattering: With Applications to Chemistry, Biology, and Physics
Bruce J. Berne,R. Pecora +1 more
TL;DR: In this paper, a comprehensive introduction to principles underlying laser light scattering focuses on time dependence of fluctuations in fluid systems and provides an introduction to theory of time correlation functions, with chapters on projection operator techniques in statistical mechanics.
Journal ArticleDOI
Spiral defect chaos in large aspect ratio Rayleigh-Bénard convection.
TL;DR: The correlation length of the pattern decreased rapidly with increasing control parameter so that the size of a correlated area became much smaller than the area of the cell, suggesting that the chaotic behavior is intrinsic to large aspect ratio geometries.
Journal ArticleDOI
Ultralow-angle dynamic light scattering with a charge coupled device camera based multispeckle, multitau correlator
Luca Cipelletti,David A. Weitz +1 more
TL;DR: In this article, a multi-tau software correlator was used to measure dynamic light scattering at many angles simultaneously, from 0.07° to 5.1°, in order to cover the wide spectrum of decay times associated with the large range of accessible angles, where the correlator channel spacing is quasilogarithmic rather than linear.