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Yield stress “in a flash”: investigation of nonlinearity and yielding in soft materials with an optofluidic microrheometer
Soft Matter ( IF 2.9 ) Pub Date : 2021-2-2 , DOI: 10.1039/d0sm02168g Valerio Vitali 1, 2, 3, 4 , Giovanni Nava 4, 5, 6, 7 , Andrea Corno 4, 5, 6, 7 , Melissa Pezzotti 1, 2, 3, 4 , Francesca Bragheri 4, 8, 9, 10 , Petra Paiè 4, 8, 9, 10 , Roberto Osellame 4, 8, 9, 10, 11 , Marco Aldo Ortenzi 4, 6, 10, 12, 13 , Ilaria Cristiani 1, 2, 3, 4 , Paolo Minzioni 1, 2, 3, 4 , Tommaso Bellini 4, 5, 6, 7 , Giuliano Zanchetta 4, 5, 6, 7
Soft Matter ( IF 2.9 ) Pub Date : 2021-2-2 , DOI: 10.1039/d0sm02168g Valerio Vitali 1, 2, 3, 4 , Giovanni Nava 4, 5, 6, 7 , Andrea Corno 4, 5, 6, 7 , Melissa Pezzotti 1, 2, 3, 4 , Francesca Bragheri 4, 8, 9, 10 , Petra Paiè 4, 8, 9, 10 , Roberto Osellame 4, 8, 9, 10, 11 , Marco Aldo Ortenzi 4, 6, 10, 12, 13 , Ilaria Cristiani 1, 2, 3, 4 , Paolo Minzioni 1, 2, 3, 4 , Tommaso Bellini 4, 5, 6, 7 , Giuliano Zanchetta 4, 5, 6, 7
Affiliation
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Yield stress materials deform as elastic solids or flow as viscous liquids, depending on the applied stress, which also allows them to trap particles below a certain size or density threshold. To investigate the conditions for such a transition at the microscale, we use an optofluidic microrheometer, based on the scattering of an infrared beam onto a microbead, which reaches forces in the nN scale. We perform creep experiments on a model soft material composed of swollen microgels, determining the limits of linear response and yield stress values, and observe quantitative agreement with bulk measurements. However, the motion of the microbead, both below and above yielding, reflects distinctive microscale features of the surrounding material, whose plastic rearrangements were investigated by us using small, passive tracers.
中文翻译：
屈服应力“瞬间”：使用光电流变仪研究软材料的非线性和屈服
屈服应力材料会根据所施加的应力而变形为弹性固体，或者像粘性液体一样流动，这也使它们可以捕获低于特定大小或密度阈值的颗粒。为了研究在微尺度上进行这种转变的条件，我们使用了一种光流式微流变仪，其原理是将红外光束散射到微珠上，并达到nN尺度的力。我们对由溶胀的微凝胶组成的模型软材料进行蠕变实验，确定线性响应和屈服应力值的极限，并观察与批量测量的定量一致性。但是，微珠的运动（无论是低于屈服还是高于屈服）都反映了周围材料的独特微观尺度特征，我们使用小型无源示踪剂研究了其塑性重排。
更新日期：2021-02-18
中文翻译：
屈服应力“瞬间”：使用光电流变仪研究软材料的非线性和屈服
屈服应力材料会根据所施加的应力而变形为弹性固体，或者像粘性液体一样流动，这也使它们可以捕获低于特定大小或密度阈值的颗粒。为了研究在微尺度上进行这种转变的条件，我们使用了一种光流式微流变仪，其原理是将红外光束散射到微珠上，并达到nN尺度的力。我们对由溶胀的微凝胶组成的模型软材料进行蠕变实验，确定线性响应和屈服应力值的极限，并观察与批量测量的定量一致性。但是，微珠的运动（无论是低于屈服还是高于屈服）都反映了周围材料的独特微观尺度特征，我们使用小型无源示踪剂研究了其塑性重排。
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