Surfaces and intErfaces of Soft Active MattEr

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Publication . Figueiredo, Hélio Rafael de Jesus da Cruz; Coelho, Rodrigo C. V.; Gama, Margarida Telo da

We explore the dynamics of active nematics droplets on flat surfaces, utilizing lattice Boltzmann simulations of the continuum hydrodynamic theory. Our investigation covers a wide range of dynamical regimes, examining how these dynamics vary with the activity intensity and droplet size on surfaces with strong anchoring and varying equilibrium contact angles. The activity is revealed to govern a spectrum of dynamical behaviors, encompassing selfpropulsion, scission, active wetting, and droplet evaporation. Additionally, we observe that, on a specific surface (defined by anchoring and equilibrium contact angle), the dynamical regimes can be characterized by the active capillary number of suspended droplets. Furthermore, the concentration of active nematics in the droplets changes with activity, weakly impacting wetting behavior but significantly influencing droplet evaporation. Our analysis offers a comprehensive overview of the diverse dynamical regimes observed in active nematics droplets, proposing a unified description of their behavior on surfaces. We emphasize the crucial role of droplet size and discuss the diminishing influence of these regimes in the infinite-size limit, where active nematics turbulence prevails across all activity levels.

2024Dissertação de mestrado

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Entidade financiadora

Fundação para a Ciência e a Tecnologia

Programa de financiamento

3599-PPCDT

Número da atribuição

EXPL/FIS-MAC/0406/2021