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Deposits from evaporating drops have shown to take a variety of shapes,depending on the physicochemical properties of both solute and solvent.Classically, the evaporation of drops of colloidal suspensions leads to theso-called coffee ring effect, caused by radially outward flows. Here weinvestigate deposits from evaporating drops containing living motile microalgae(Chlamydomonas reinhardtii), which are capable of resisting these flows. Weshow that utilizing their light-sensitivity allows to control the finalpattern: adjusting the wavelength and incident angle of the light sourceenables to force the formation, completely suppress and even direct the spatialstructure of algal coffee rings.

Light-switchable deposits from evaporating drops containing motile microalgae