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.

中文翻译：

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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

干燥过程中悬浮液的开裂是一个常见问题。虽然添加剂，例如粘合剂和表面活性剂，可以缓解这个问题，但一些应用，例如印刷导电糊或烧结生坯，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配方。在这项工作中，我们使用同步压力和重量测量来研究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，相比之下，抗开裂的鲁棒性更高。干膜孔隙率的增加不是应力降低的关键驱动因素。相反，产生强大粒子网络的毛细管桥会抵抗压力。增加相对湿度会增强这种效果，即使对于纯悬浮液也是如此。