Please use this identifier to cite or link to this item: https://hdl.handle.net/10955/757
Title: Turbulence and Stochastic Processes in Nematic Liquid Crystals
Authors: Carbone, Francesco
Strangi, Giuseppe
Versace, Carlo
Keywords: Chimica fisica
Elettrodinamica
Campi magnetici
Processi
Cristalli liquidi
Fluidodinamica
Issue Date: 22-Oct-2010
Series/Report no.: FIS/01;
Abstract: In this work we studied the electrohydrodynamics instabilities (EHD) from a different point of view. We used the traditional tools, belonging to the traditional fluid turbulence framework, to the world of liquid crystals. This tools in addition, for the first time, a 3D scanning of the NLC sample driven in these turbulent regimes, give us some interesting results. As an example a fragmentation of the large scale structures (Williams Domains) whit characteristics similar to the Richardson cascade. We also studied, for the first time, the intensity fluctuation at different depth z inside the sample, and we found a strong non gaussianity in the probability density function of this fluctuation. Further information has been obtained by by studying the decorrelation processes in EHD. We found a local transition between two different regimes: the classical Kolomokorov K41 law in the y direction, and a random sweeping decorrelation in the opposite x direction. Finally we study the weak localization of light obtained during the EHD. We found a drastic reduction in the scattering mean free path `? and a strong enhancement of the backscattering cone.
Description: Dottorato di Ricerca in “Scienze e Tecnologie delle Mesofasi e dei Materiali Molecolari, Ciclo XXIII, a.a. 2010
URI: http://hdl.handle.net/10955/757
https://doi.org/10.13126/unical.it/dottorati/757
Appears in Collections:Dipartimento di Fisica - Tesi di Dottorato

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