Abstract The effect of surfactants with different chain length on the drying dynamics of nanosized dispersion droplets and on the final morphology of the grains formed after water evaporation is investigated experimentally. An acoustic levitator was used to examine the drying dynamics of single droplets and SEM imaging was used to characterise the morphology of the final dried grains. Results show that the drying of drops with high molecular weight surfactants leads to more irregular grains and that the grain morphology is related to surface tension driven instability of the evaporating droplets which may lead to formation of hollow dried grains.

中文翻译：

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表面活性剂-纳米流体液滴干燥过程中的形态变化

摘要 通过实验研究了不同链长的表面活性剂对纳米分散液滴干燥动力学和水分蒸发后形成的颗粒最终形态的影响。使用声学悬浮器来检查单个液滴的干燥动力学，并使用 SEM 成像来表征最终干燥谷物的形态。结果表明，用高分子量表面活性剂干燥液滴会导致更不规则的颗粒，并且颗粒形态与表面张力驱动的蒸发液滴的不稳定性有关，这可能导致形成中空干燥颗粒。