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arXiv 2009.08149cond-mat.soft
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干燥条件对毛细管悬浮液应力和重量发展的影响

Influence of drying conditions on the stress and weight development of capillary suspensions

Steffen B. Fischer, Erin Koos

摘要:

悬浮液在干燥过程中的破裂是一个常见的问题。虽然添加剂,例如粘合剂和表面活性剂,可以减轻这个问题,一些应用,如印刷导电膏或烧结生坯,不适合使用添加剂。毛细管悬浮液提供了一种不含添加剂的替代制剂。在这项工作中,我们使用同时应力和重量测量,以调查配方和干燥条件的影响。毛细管悬浮液干燥更均匀,峰值应力更低,导致抗开裂的鲁棒性增加。干膜孔隙率的增加不是应力降低的关键驱动因素。相反,毛细管桥,创建强大的颗粒网络,抵抗应力。增加相对湿度会增强这种效应,即使对于纯悬浮液也是如此。虽然较低沸点的次级液体(例如水)在干燥期间持续非常长的时间,但较高沸点的液体提供了进一步调整干燥过程的潜力。

英文摘要:

Cracking of suspensions during drying is a common problem. While additives, e.g. binders and surfactants, can mitigate this problem, some applications, such as printing conductive pastes or sintering green bodies, do not lend themselves to the use of additives. Capillary suspensions provide an alternative formulation without additives. In this work, we use simultaneous stress and weight measurements to investigate the influence of formulation and drying conditions. Capillary suspensions dry more homogeneously and with lower peak stresses, leading to an increased robustness against cracking compared. An increase in dry film porosity is not the key driver for the stress reduction. Instead, the capillary bridges, which create strong particle networks, resist the stress. Increasing the relative humidity enhances this effect, even for pure suspensions. While lower boiling point secondary liquids, e.g. water, persist for very long times during drying, higher boiling point liquids offer further potential to tune the the drying process.

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