Journal ArticleDOI
Use of dynamic schlieren interferometry to study fluctuations during free diffusion.
TLDR
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
The NEUF-DIX space project - Non-EquilibriUm Fluctuations during DIffusion in compleX liquids
Philipp Baaske,Henri Bataller,Marco Braibanti,Marina Carpineti,Roberto Cerbino,Fabrizio Croccolo,Fabrizio Croccolo,Aleksandar Donev,Werner Köhler,José M. Ortiz de Zárate,Alberto Vailati +10 more
TL;DR: The focus of the project is on the investigation in micro-gravity conditions of the non-equilibrium fluctuations in complex liquids, trying to tackle several challenging problems that emerged during the latest years, such as the theoretical predictions of Casimir-like forces induced by non-Equilibrium fluctuations.
Journal ArticleDOI
Characterization of anisotropic nano-particles by using depolarized dynamic light scattering in the near field.
Doriano Brogioli,Domenico Salerno,Valeria Cassina,Stefano Sacanna,Albert P. Philipse,Fabrizio Croccolo,Francesco Mantegazza +6 more
TL;DR: In this article, the translational and rotational diffusion coefficients of rod-like colloidal particles were measured with a dynamic near field scattering instrument, measuring both polarized and depolarized scattered light.
Journal ArticleDOI
Dynamic heterodyne near field scattering
TL;DR: In this article, the technique heterodyne near field scattering (HNFS) has been used for low-angle static light scattering and also implemented for carrying out dynamic light scattering.
Journal ArticleDOI
Slowing-down of non-equilibrium concentration fluctuations in confinement
Cédric Giraudet,Henri Bataller,Yifei Sun,Aleksandar Donev,José M. Ortiz de Zárate,Fabrizio Croccolo +5 more
TL;DR: In this paper, the authors explore fluctuations of even larger size, comparable to the extent of the system in the direction of the gradient, and find experimental evidence of a dramatic slowing-down of their dynamics.
Journal ArticleDOI
Structure and dynamics of concentration fluctuations in a non-equilibrium dense colloidal suspension
TL;DR: This work studies the giant concentration NEF arising when a dense aqueous colloidal suspension is allowed to diffuse into an overlying layer of pure water, enabling a straightforward determination of the osmotic compressibility of the suspension during diffusion.
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.