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Reply to "Comment on 'Patterns in Drying Drops Dictated by Curvature-Driven Particle Transport'"
P Logesh Kumar1, Ranajit Mondal1, Sumesh P Thampi1
1Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering , Indian Institute of Technology Madras , Chennai 600036 , Tamil Nadu , India.
Abstract:
Hodges and Tangparitkul (Hodges, C. S.; Tangparitkul, S. M. Langmuir 2019, 35, doi: 10.1021/acs.langmuir.9b01442) in their Comment on "Patterns in Drying Drops Dictated by Curvature Driven Particle Transport" argue that the coffee-eye deposits in dried pendant drops can also be formed if the particles or particle clusters in the drying drop are large enough to sediment during the course of evaporation. In our reply to this comment, we compare these two different mechanisms, namely, gravity settling and curvature-driven interfacial migration of particles in the drying particle-laden drops, with an aim towards placing them in a correct perspective.