Forced Wetting of Shear-Thinning Fluids in Confined Capillaries

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-09-25 DOI:10.1021/acs.langmuir.4c02728

Xiong Wang, Zhenyue Yuan, Feipeng Chen, Xiaoxue Yao, Fanfei Yu, Steven Wang

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引用次数: 0

Abstract

Dynamic wetting in confined spaces is pivotal for the functional efficiency of biological organisms and offers significant potential for optimizing microdevices. The fluids encountered in such scenarios often exhibit shear-thinning behavior, which gives rise to complex interfacial phenomena. Here, we present an intriguing wetting phenomenon for shear-thinning fluids in confined capillary spaces. The employed shear-thinning fluids, carboxymethyl cellulose aqueous solutions with mass fractions of 0.5, 1.0, and 1.5 wt %, exhibit an intermediate state between ideal viscoelastic liquids, viscoelastic solids, and gel-like properties. We elucidate the geometric effect on its capillary wetting behavior, demonstrating that distortion of the moving contact line alters flow dynamics near the front corner, modifying the viscous resistance. This intricate interplay between the modified viscous resistance and the driving force results in a novel dynamic equilibrium distinct from that in Newtonian fluids. We further reveal that the viscous resistance in confined capillaries is controlled by both the morphology of the moving contact line and the shear-thinning exponent, particularly within the range of 0.7 to 1. This novel mechanism provides a pathway for manipulating the wetting dynamics of complex fluids in confined spaces.

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剪切稀化流体在封闭毛细管中的强制润湿

密闭空间中的动态润湿对生物机体的功能效率至关重要，并为优化微型设备提供了巨大潜力。在这种情况下遇到的流体往往表现出剪切稀化行为，从而产生复杂的界面现象。在此，我们介绍了剪切稀化流体在密闭毛细空间中的一种有趣的润湿现象。所采用的剪切稀化流体是质量分数为 0.5、1.0 和 1.5 wt % 的羧甲基纤维素水溶液，表现出介于理想粘弹性液体、粘弹性固体和凝胶特性之间的中间状态。我们阐明了其毛细管润湿行为的几何效应，证明移动接触线的变形改变了前角附近的流动动力学，从而改变了粘滞阻力。改变后的粘滞阻力与驱动力之间错综复杂的相互作用导致了一种不同于牛顿流体的新型动态平衡。我们进一步揭示了密闭毛细管中的粘滞阻力受移动接触线形态和剪切稀化指数的控制，尤其是在 0.7 到 1 的范围内。这种新型机制为操纵复杂流体在密闭空间中的润湿动力学提供了一种途径。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).