Suppressing Crack Formation in Particulate Systems by Utilizing Capillary Forces.
Suppressing Crack Formation in Particulate Systems by Utilizing Capillary Forces.
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DOI：
10.1021/acsami.6b13624
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发表时间：
2017-03-29
影响因子：
9.5
通讯作者：
Koos E
中科院分区：
文献类型：
--
作者：
Schneider M;Maurath J;Fischer SB;Weiß M;Willenbacher N;Koos E
在颗粒膜干燥过程中形成的裂纹会降低有效性，甚至使产品无用。我们提出了一种新的，通用的方法来抑制裂纹形成的薄膜制成的硬颗粒悬浮液，这是否则非常容易开裂，使用颗粒之间的毛细作用力时，微量的不混溶的液体被添加到悬浮液。该第二液体保持颗粒凝聚力，改变结构并提高干燥速率。无裂纹膜可以在远大于临界开裂厚度的厚度下产生，而没有毛细管相互作用，甚至在烧结后仍然存在。这种毛细管悬浮策略适用于广泛的材料，包括金属、氧化铝和陶瓷氧化物或玻璃状聚合物颗粒的悬浮液，并且可以容易地在许多工业过程中实施，因为它是基于完善的单元操作。应用前景广阔的领域包括陶瓷箔和印刷电子器件。
Cracks, formed during the drying of particulate films, can reduce the effectiveness or even render products useless. We present a novel, generic approach to suppress crack formation in thin films made from hard particle suspensions, which are otherwise highly susceptible to cracking, using the capillary force between particles present when a trace amount of an immiscible liquid is added to a suspension. This secondary liquid preserves the particle cohesion, modifying the structure and increasing the drying rate. Crack-free films can be produced at thicknesses much greater than the critical cracking thickness for a suspension without capillary interactions, and even persists after sintering. This capillary suspension strategy is applicable to a broad range of materials including suspensions of metals, semiconductive and ceramic oxides or glassy polymeric particles and can be easily implemented in many industrial processes since it is based on well-established unit operations. Promising fields of application include ceramic foils and printed electronic devices.