Memory effect and anisotropy of particle arrangements in granular paste
Memory effect and anisotropy of particle arrangements in granular paste
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颗粒糊中颗粒排列的记忆效应和各向异性
DOI：
10.1140/epje/i2017-11578-4
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发表时间：
2017
影响因子：
1.8
通讯作者：
Yousuke Matsuo and Akio Nakahara
中科院分区：
文献类型：
--
作者：
So Kitsunezaki;Arina Sasaki;Akihiko Nishimoto;Tsuyoshi Mizuguchi;Yousuke Matsuo and Akio Nakahara
众所周知，细粉糊状物，例如粘土糊状物，在干燥过程的早期保留了振动的记忆。这种记忆导致干燥后出现各向异性的干燥裂纹图案。在这项工作中，我们发现了一个类似的行为在糊组成的大颗粒颗粒，特别是玉米淀粉和石松孢子。由于颗粒尺寸大，我们能够用微焦点X射线计算机断层扫描（CT）观察石松糊剂中的颗粒排列。我们制备了由石松颗粒和水组成的糊剂。将琼脂添加到糊剂中以允许在干燥过程中固化。在这些样品中，我们发现在干燥过程的早期应用振动引起的统计各向异性。这种各向异性具有一个特征，该特征是根据先前的实验和理论研究结果预测的。图形摘要
AbstractIt is known that pastes of fine powder, for example those of clay, retain memory of shaking applied early in a drying process. This memory results in the appearance of anisotropic patterns of desiccation cracks after drying. In this work, we find a similar behavior in pastes consisting of large granular particles, specifically cornstarch and Lycopodium spores. Because of the large particle size, we were able to observe particle arrangements in Lycopodium paste with micro-focus X-ray computerized tomography (CT). We prepared pastes consisting of Lycopodium particles and water. Agar was added to the paste in order to allow for solidification during a drying process. In these samples, we found statistical anisotropy induced by shaking applied early in the drying process. This anisotropy possesses a feature that was predicted on the basis of results obtained in previous experimental and theoretical studies.Graphical abstract