The dependence of the yield stress on the rheological method and microstructure in soft materials

IF 2.4 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2026-06-15 DOI:10.1007/s13367-026-00170-8

Erika L. García-Romero, Lucy-Caterine Daza-Gómez, Gabriel Ascanio, Karen Y. Pérez-Salas, Juan P. Aguayo

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Abstract

Yield stress is a key parameter in the study of soft materials, but its value depends on the experimental criterion used to define it. In this work, three representative systems are analyzed: a BBQ sauce as a low-strength colloidal dispersion, a hair gel as an intermediate polymer hydrogel, and a chitosan hydrogel as an example of a rigid polyelectrolyte network. The rheological results show that the obtained yield stress values vary depending on the method used. The comparison between systems shows that the concentration and type of polymer determine the magnitude of \(\:{G}^{{\prime\:}}\), \(\:{G}^{{\prime\:\prime\:}}\) and \(\:{\tau\:}_{0}\) with chitosan being the strongest material due to its rigid structure and stronger interactions. The determination of the yield stress should not be interpreted as an absolute value but rather as an interval, considering the point at which the material begins to change its structure until it becomes completely liquid.

Graphical abstract

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软质材料中屈服应力与流变方法和微观结构的关系

屈服应力是软质材料研究中的一个关键参数，但它的取值取决于用来定义屈服应力的实验准则。在这项工作中，分析了三种具有代表性的体系：烧烤酱作为低强度胶体分散体，发胶作为中间聚合物水凝胶，壳聚糖水凝胶作为刚性聚电解质网络的例子。流变学结果表明，所得到的屈服应力值随所用方法的不同而变化。体系间的比较表明，聚合物的浓度和类型决定了\(\:{G}^{{\prime\:}}\)、\(\:{G}^{{\prime\:\prime\:}}\)和\(\:{\tau\:}_{0}\)的大小，壳聚糖由于其刚性结构和更强的相互作用而成为最强的材料。屈服应力的测定不应该被解释为一个绝对值，而应该被解释为一个区间，考虑到材料开始改变其结构直到它完全变成液体的那一点。图形摘要

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.