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dc.contributor.authorMartínez Prat, Berta-
dc.contributor.authorIgnés i Mullol, Jordi-
dc.contributor.authorCasademunt i Viader, Jaume-
dc.contributor.authorSagués i Mestre, Francesc-
dc.description.abstractActive turbulence describes a flow regime that is erratic, and yet endowed with a characteristic length scale. It arises in animate soft-matter systems as diverse as bacterial baths , cell tissues and reconstituted cytoskeletal preparations. However, the way that these turbulent dynamics emerge in active systems has so far evaded experimental scrutiny. Here we unveil a direct route to active nematic turbulence by demonstrating that, for radially aligned unconfined textures, the characteristic length scale emerges at the early stages of the instability. We resolve two-dimensional distortions of a microtubule-based extensile system in space and time, and show that they can be characterized in terms of a growth rate that exhibits quadratic dependence on a dominant wavenumber. This wavelength selection mechanism is justified on the basis of a continuum model for an active nematic including viscous coupling to the adjacent fluid phase. Our findings are in line with the classical pattern-formation studies in non-active systems, bettering our understanding of the principles of active self-organization, and providing potential perspectives for the control of biological fluids.-
dc.format.extent5 p.-
dc.publisherNature Publishing Group-
dc.relation.isformatofVersió postprint del document publicat a:
dc.relation.ispartofNature Physics, 2019, vol. 15, p. 362-366-
dc.rights(c) Martínez Prat, Berta et al., 2019-
dc.subject.classificationDinàmica de fluids-
dc.subject.classificationCristalls líquids nemàtics-
dc.subject.otherFluid dynamics-
dc.subject.otherNematic liquid crystals-
dc.titleSelection mechanism at the onset of active turbulence-
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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