阻塞体系刮涂中的类临界现象
Critical-like phenomenon in scraping of jamming systems
AI总结：
本文研究刚性板刮涂泡沫时部分刮涂与细长刮涂区态的转变，发现气泡重排依次传播及刮涂长度临界发散，临界指数约0.61，支持定向渗流机制。
摘要：
在胶体、乳液、泡沫和生物组织等阻塞体系中，显著变形对于材料刮涂或伤口自愈等过程至关重要。为了将泡沫或乳膏充分铺展在表面上，必须施加外力进行人工刮涂。已观察到，使用刚性板刮涂泡沫会表现出不同于简单液体的复杂行为。本研究通过考察内部结构和部分铺展长度的变化，定量分析了部分刮涂区态与细长刮涂区态之间的转变。结果表明，泡沫内部结构中气泡重排的依次传播导致了部分刮涂。此外，部分刮涂区态中的刮涂长度在转变点附近呈现发散，其临界指数约为0.61。这些结果意味着泡沫刮涂受定向渗流理论支配，实验观测到的临界指数与理论预测相符也支持了这一点。本研究显著推进了对泡沫、胶体、乳液和生物组织等阻塞体系中宏观动力学和流变行为的理解。
英文摘要：
In jamming systems like colloids, emulsions, foams, and biological tissues, significant deformation is essential for processes such as material scraping or wound self-healing. To adequately spread a foam or cream over a surface, external force must be applied to artificially scrape it. The scraping of foam using a rigid plate has been observed to exhibit complex behavior distinct from that of simple liquids. In this study, we quantitatively analyzed the transition between partial and slender scraping regimes by examining changes in internal structure and partial spreading lengths. Our findings reveal that the sequential propagation of bubble rearrangement in the foam's internal structure leads to the partial scraping. Moreover, the scraping length in the partial scraping regime shows divergence near the transition point, characterized by a critical exponent of approximately 0.61. These results imply that foam scraping is governed by directional percolation theory, supported by the agreement between the experimentally observed critical exponent and theoretical predictions. This research significantly advances the understanding of macroscopic kinetics and rheological behavior in jamming systems, including foams, colloids, emulsions, and biological tissues.
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