Flow-driven pattern formation during coacervation of xanthan gum with a cationic surfactant†

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2024-12-13 DOI:10.1039/D4CP01055H

Y. Stergiou, A. Perrakis, A. De Wit and K. Schwarzenberger

引用次数: 0

Abstract

We experimentally demonstrate that the coacervation of a biopolymer can trigger a hydrodynamic instability when a coacervate is formed upon injection of a xanthan gum dispersion into a cationic surfactant (C₁₄TAB) solution. The local increase of the viscosity due to the coacervate formation induces a viscous fingering instability. Three characteristic displacement regimes were observed: a viscous fingering dominated regime, a buoyancy-controlled “volcano” regime and a “fan”-like regime determined by the coacervate membrane dynamics. The dependence of the spatial properties of the viscous fingering pattern on the Péclet and Rayleigh numbers is investigated.

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黄原胶与阳离子表面活性剂凝聚过程中流动驱动模式的形成

我们通过实验证明，当黄原胶分散体注入到阳离子表面活性剂（C_{14}TAB）溶液中形成凝聚时，生物聚合物的凝聚可以触发流体动力学不稳定性。由于凝聚形成而引起的局部粘度增加引起粘指不稳定性。观察到三种特征位移模式：粘性指指主导模式、浮力控制的“火山”模式和由凝聚膜动力学决定的“扇形”模式。研究了粘指模式的空间特性与psamclet数和Rayleigh数的关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.