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Science 27 October 2006:
Vol. 314. no. 5799, p. 561
DOI: 10.1126/science.314.5799.561d
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This Week in Science

The Brownian diffusion of spherical particles is well understood and goes back to the pioneering work of Einstein and Perrin, but for ellipsoidal particles, the problem becomes much harder because rotational and translational motion are coupling. This problem has been studied theoretically, but the coupling was not directly demonstrated. Han et al. (p. 626) demonstrate this coupling for a combined theoretical and experimental investigation of ellipsoidal particles, and observe the crossover from anisotropic behavior at short times to isotropic diffusion at long times.




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