Two-dimensional rheo-optical measurement system to study dynamics and structure of complex fluids

IF 5.8 4区 工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2024-05-10 DOI:10.1515/arh-2024-0006
Taisuke Sato, Yoshifumi Yamagata, Yasunori Sato, Takashi Onuma, Keisuke Miyamoto, Tsutomu Takahashi
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Abstract

We have developed a novel rheo-optical measurement system based on two-dimensional polarization analysis, which can evaluate the rheological properties and structure of a complex fluid simultaneously. To assess the utility of the system, we used it to investigate the relationship between yield behavior and structural evolution in a TEMPO-oxidized cellulose nanofiber (T-CNF) suspension, which is a yield-stress fluid that has been actively studied in recent years. To analyze the structural evolution of a T-CNF suspension, stress-ramp tests were conducted. A two-step yield behavior was observed, and distributions of retardation and orientation axis varied dramatically with increasing shear stress. In particular, different distributions were observed in the three regions: after the first yield point, before the second yield point, and after the second yield point. In experiments with a low-concentration T-CNF suspension that exhibits no yield behavior, the retardation increased monotonically with increasing shear stress, and its distribution was uniform. It was demonstrated that the yield behavior and related structures can be analyzed from these results. More detailed structural mechanisms require various rheological tests using the developed system. However, the present insights demonstrate the valuable information provided by the developed rheo-optical measurement system, contributing essential knowledge for applications in various fields.
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用于研究复杂流体动力学和结构的二维流变光学测量系统
我们开发了一种基于二维偏振分析的新型流变光学测量系统,可以同时评估复杂流体的流变特性和结构。为了评估该系统的实用性,我们用它来研究 TEMPO 氧化纤维素纳米纤维(T-CNF)悬浮液中屈服行为与结构演变之间的关系。为了分析 T-CNF 悬浮液的结构演变,我们进行了应力斜坡试验。试验观察到了两步屈服行为,随着剪切应力的增加,延迟和取向轴的分布也发生了显著变化。特别是在三个区域观察到了不同的分布:第一个屈服点之后、第二个屈服点之前和第二个屈服点之后。在使用低浓度 T-CNF 悬浮液进行的实验中,该悬浮液没有屈服行为,其延迟率随剪切应力的增加而单调增加,且分布均匀。实验证明,可以从这些结果中分析屈服行为和相关结构。更详细的结构机制需要使用所开发的系统进行各种流变测试。不过,目前的研究结果表明,所开发的流变光学测量系统提供了宝贵的信息,为各个领域的应用提供了必要的知识。
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来源期刊
Applied Rheology
Applied Rheology 物理-力学
CiteScore
3.00
自引率
5.60%
发文量
7
审稿时长
>12 weeks
期刊介绍: Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.
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