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Embedding orthogonal memories in a colloidal gel through oscillatory shear.
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-27 , DOI: 10.1039/c9sm02222h Eric M Schwen 1 , Meera Ramaswamy 1 , Chieh-Min Cheng 2 , Linda Jan 2 , Itai Cohen 1
Soft Matter ( IF 2.9 ) Pub Date : 2020-03-27 , DOI: 10.1039/c9sm02222h Eric M Schwen 1 , Meera Ramaswamy 1 , Chieh-Min Cheng 2 , Linda Jan 2 , Itai Cohen 1
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It has recently been shown that in a broad class of disordered systems oscillatory shear training can embed memories of specific shear protocols in relevant physical parameters such as the yield strain. These shear protocols can be used to change the physical properties of the system and memories of the protocol can later be "read" out. Here we investigate shear training memories in colloidal gels, which include an attractive interaction and network structure, and discover that such systems can support memories both along and orthogonal to the training flow direction. We use oscillatory shear protocols to set and read out the yield strain memories and confocal microscopy to analyze the rearranging gel structure throughout the shear training. We find that the gel bonds remain largely isotropic in the shear-vorticity plane throughout the training process suggesting that structures formed to support shear along the training shear plane are also able to support shear along the orthogonal plane. Orthogonal memory extends the usefulness of shear memories to more applications and should apply to many other disordered systems as well.
中文翻译：
通过振荡剪切将正交记忆嵌入胶体凝胶中。
最近显示，在一大类无序系统中，振荡剪切训练可以将特定剪切方案的记忆嵌入诸如屈服应变的相关物理参数中。这些剪切协议可用于更改系统的物理属性，协议的内存可在以后“读取”。在这里，我们研究了胶体凝胶中的剪切训练记忆，其中包括有吸引力的相互作用和网络结构，并发现这种系统可以支持沿着训练流方向并与训练流方向正交的记忆。我们使用振荡剪切协议来设置和读出屈服应变记忆和共聚焦显微镜，以分析整个剪切训练过程中的重排凝胶结构。我们发现，在整个训练过程中，凝胶键在剪切涡度平面内基本上保持各向同性，这表明为支撑沿训练剪切平面的剪切而形成的结构也能够支撑沿正交剪切平面的剪切。正交记忆将切变记忆的用途扩展到更多应用程序，并且也应适用于许多其他无序系统。
更新日期：2020-04-24
中文翻译：
通过振荡剪切将正交记忆嵌入胶体凝胶中。
最近显示，在一大类无序系统中，振荡剪切训练可以将特定剪切方案的记忆嵌入诸如屈服应变的相关物理参数中。这些剪切协议可用于更改系统的物理属性，协议的内存可在以后“读取”。在这里，我们研究了胶体凝胶中的剪切训练记忆，其中包括有吸引力的相互作用和网络结构，并发现这种系统可以支持沿着训练流方向并与训练流方向正交的记忆。我们使用振荡剪切协议来设置和读出屈服应变记忆和共聚焦显微镜，以分析整个剪切训练过程中的重排凝胶结构。我们发现，在整个训练过程中，凝胶键在剪切涡度平面内基本上保持各向同性，这表明为支撑沿训练剪切平面的剪切而形成的结构也能够支撑沿正交剪切平面的剪切。正交记忆将切变记忆的用途扩展到更多应用程序，并且也应适用于许多其他无序系统。
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