Browsing by Author "Cichos, F."

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    A critical microscopic engine in an optical tweezers
    (OSA, 2018) Schmidt, F.; Magazzù, Agnese; Callegari, A.; Biancofiore, Luca; Cichos, F.; Volpe, G.
    An optically trapped absorbing microsphere in a sub-critical mixture rotates around the optical trap thanks to diffusiophoretic propulsion, which can be controlled by adjusting the optical power, the temperature, and the criticality of the mixture.
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    Microscopic engine powered by critical demixing
    (American Physical Society, 2018) Schmidt, F.; Magazzù, A.; Callegari, Agnese; Biancofiore, Luca; Cichos, F.; Volpe, G.
    We experimentally demonstrate a microscopic engine powered by the local reversible demixing of a critical mixture. We show that, when an absorbing microsphere is optically trapped by a focused laser beam in a subcritical mixture, it is set into rotation around the optical axis of the beam because of the emergence of diffusiophoretic propulsion. This behavior can be controlled by adjusting the optical power, the temperature, and the criticality of the mixture.
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    ItemOpen Access
    Microscopic engine powered by critical demixing
    (OSA, 2017) Schmidt, F.; Magazzu, Alessandro; Callegari, Agnese; Biancofiore, Luca; Cichos, F.; Volpe, Giovanni
    We propose a new type of engine that is powered by the local, reversible demixing of a critical binary liquid. A microscopic particle is optically trapped and performs revolutions due to the emergence of diffusiophoresis.