We show that mixing a colloidal gel with larger, non-Brownian grains generates novel flow-switched bistability. Using a combination of confocal microscopy and rheology, we find that prolonged moderate shear results in liquefaction by collapsing the gel into disjoint globules, whereas fast shear gives rise to a yield-stress gel with granular inclusions upon flow cessation. We map out the state diagram of this new “mechanorheological material” with varying granular content and demonstrate that its behavior is also found in separate mixture using different particles and solvents.

中文翻译：

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具有非布朗晶粒的胶体凝胶中的流量转换双稳态

我们表明，将胶体凝胶与较大的非布朗颗粒混合会产生新的流量转换双稳态。使用共聚焦显微镜和流变学的组合，我们发现长时间的中等剪切通过将凝胶塌缩成不相交的小球而导致液化，而快速剪切会在流动停止时产生具有颗粒状内含物的屈服应力凝胶。我们绘制了这种具有不同颗粒含量的新型“机械流变材料”的状态图，并证明它的行为也存在于使用不同颗粒和溶剂的单独混合物中。