Abstract
Understanding flow patterns and coupled transport phenomena during evaporation of droplets loaded with colloidal particles is central to design technical applications such as organizing proteins/DNA on a solid surface. We review recent reports on evaporating sessile droplets of colloidal suspensions on a solid surface. Starting from the classical mechanism of formation of a ring-like deposit, we discuss the influence of several problem parameters. Notably, thermal or solutal Marangoni effect, particle size, particle concentration, particle shape, substrate wettability, pH of the suspension, etc. have been found important in controlling the deposition pattern. The deposit pattern complexity and shape have been attributed to the underlying coupled transport phenomena during the evaporation. We discuss important regime maps reported for different types of deposits, which allow us to classify the deposits and coupled physics. We also present studies that have demonstrated particles sorting in an evaporating bidispersed colloidal suspension on a solid surface. Finally, some remarks for the future research opportunities in this arena are presented.
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Acknowledgements
RB gratefully acknowledges financial support by a Grant (EMR/2016/006326) from the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), New Delhi, India.
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Patil, N.D., Bhardwaj, R. Recent Developments on Colloidal Deposits Obtained by Evaporation of Sessile Droplets on a Solid Surface. J Indian Inst Sci 99, 143–156 (2019). https://doi.org/10.1007/s41745-019-0105-9
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DOI: https://doi.org/10.1007/s41745-019-0105-9