Abstract
Experiments have been performed on the formation of ding-shaped deposits upon the evaporation of dispersion droplets on different substrates accompanied by the coffee ring effect. The main attention has been focused on studying the structure of a formed deposit as depending on the initial contact angle of a droplet. It has been established that the deposit structure may vary from ring-shaped to disc-shaped with a decrease in the contact angle. For certain systems, as the initial contact angle is varied, the scenario of droplet evaporation may change and, in some cases, acquire a combined character. Before the onset of pinning, menisci of droplets that are evaporated on modified polymer substrates may initially move not only toward the droplet center, but also in the opposite direction.
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Original Russian Text © S.P. Molchanov, V.I. Roldughin, I.A. Chernova-Kharaeva, G.A. Yurasik, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 5, pp. 588–595.
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Molchanov, S.P., Roldughin, V.I., Chernova-Kharaeva, I.A. et al. Dependence of the structure of ring-shaped deposits resulting from evaporation of dispersion droplets on initial contact angle. Colloid J 78, 633–640 (2016). https://doi.org/10.1134/S1061933X16050094
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DOI: https://doi.org/10.1134/S1061933X16050094