Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 19, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/19/195201
Keywords
microscopy; scattering; Brownian motion; rotational diffusion; translational diffusion
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Funding
- Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) [RBFR125H0M]
- CONACYT-Mexico [166645]
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We probe the roto-translational Brownian motion of optically anisotropic particles suspended in water with a simple and straightforward optical microscopy experiment that does not require positional or rotational particle tracking. We acquire a movie of the suspension placed between two polarizing elements and we extract the translational diffusion coefficient DT and the rotational diffusion coefficient DR from the analysis of the temporal correlation properties of the spatial Fourier modes of the intensity fluctuations in the movie. Our method is successfully tested with a dilute suspension of birefringent spherical colloidal particles obtained by polymerizing an emulsion of droplets of liquid crystal in a nematic phase, whose roto-translational dynamics is found to be well described by theory. The simplicity of our approach makes our method a viable alternative to particle tracking and depolarized dynamic light scattering.
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