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venerdì 22 marzo 2024
# gst: rearrangements of a jammed 2-D emulsion (during slow compression).
venerdì 4 febbraio 2022
# gst: apropos of apparent erratic dynamics, the self-organization of drops bouncing on a vertically-vibrated surface
sabato 25 settembre 2021
# gst: ️apropos of spontaneous active matter, the active droploids.
lunedì 5 luglio 2021
# gst: apropos of (multitudes) of transitional droplets, when a liquid film collapses in a foam ...
mercoledì 5 maggio 2021
# gst: when and how a levitating droplet sings (as a pipe)
sabato 1 agosto 2020
# GST: how to harvest energy from impacting droplets
sabato 12 ottobre 2019
# gst: exploring the lifespan of a liquid droplet
<< Current theories state that the droplet's diameter-squared decreases in proportion to time (classical law); however, this period only accounts for a small portion of the drop's evolution. As the diameter approaches the unobservable micro- and nano-scale, molecular dynamics have to be used as virtual experiments and these show a crossover to a new behaviour, with the diameter now reducing in proportion to time (nano-scale law). >>
<< It is fascinating that intuition based on everyday observations are a hindrance when attempting to understand nanoscale flows, so that, as in this research, one has to lean on theory to enlighten us. >> James Sprittles.
The lifespan of an evaporating liquid drop. University of Warwick. Oct 10, 2019. https://m.phys.org/news/2019-10-lifespan-evaporating-liquid.html
Rana A.S., Lockerby D.A., Sprittles J.E. Lifetime of a Nanodroplet: Kinetic Effects and Regime Transitions. Phys. Rev. Lett. 123, 154501 Oct 9, 2019. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.154501
sabato 24 agosto 2019
# gst: active drops: from steady to chaotic self-propulsion
<< Individual chemically active drops suspended in a surfactant solution were observed to self-propel spontaneously with straight, helical, or chaotic trajectories. (..) strong advection (e.g., large droplet size) may destabilize a steadily self-propelling drop; once destabilized, the droplet spontaneously stops and a symmetric extensile flow emerges. If advection is strengthened even further in comparison with molecular diffusion, the droplet may perform chaotic oscillations. >>
Matvey Morozov, Sebastien Michelin. Nonlinear dynamics of a chemically-active drop: From steady to chaotic self-propulsion. J. Chem. Phys. 150, 044110 (2019). doi: 10.1063/1.5080539. Jan 31, 2019. https://aip.scitation.org/doi/10.1063/1.5080539