空气/溶液界面上两性三嵌段共聚物的平衡和流变行为中的离子强度效应

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-03-01 DOI:10.3390/colloids8020016

Carlo Carbone, E. Guzmán, J. Maldonado-Valderrama, Ramón G. Rubio, F. Ortega

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引用次数: 0

摘要

本研究探讨了惰性盐（NaCl）对 Pluronic F-68 共聚物的平衡界面张力和扩张模量的影响，Pluronic F-68 共聚物是一种三嵌段共聚物，由两个末端嵌段聚环氧乙烷和一个亲水性较弱的中心嵌段聚环氧丙烷组成。测量界面张力时使用了表面力平衡和液滴形状张力计，而流变测量则在两个不同的频率范围内进行。其中包括使用振荡屏障/液滴法和电毛细管波测量法，并辅以适当的理论框架。这项工作旨在阐明 NaCl 对 Pluronic F-68 吉布斯单层界面行为的影响。此外，这项研究还强调了在高频率（<1 kHz）下使用电毛细管波测量法获得可靠的扩张流变学数据所存在的一些技术和理论限制。研究结果为了解盐的存在与 Pluronic F-68 的界面特性之间的相互作用提供了宝贵的见解，并强调了在特定测量条件下获得准确的扩张流变数据所面临的挑战。

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Ionic Strength Effect in the Equilibrium and Rheological Behavior of an Amphiphilic Triblock Copolymer at the Air/Solution Interface

This study investigates the effect of an inert salt (NaCl) on the equilibrium interfacial tension and dilatational modulus of Pluronic F-68 copolymer, a triblock copolymer consisting of two terminal blocks of poly(ethylene oxide) and a less hydrophilic central block of poly(propylene oxide). Interfacial tension measurements were carried out using a surface force balance and a drop shape tensiometer, while rheological measurements were carried out in two different frequency ranges. This involved the use of the oscillatory barrier/droplet method and electrocapillary wave measurements, complemented by an appropriate theoretical framework. This work aimed to elucidate the influence of NaCl on the interfacial behavior of Gibbs monolayers of Pluronic F-68. In addition, this study highlights some of the technical and theoretical limitations associated with obtaining reliable dilatational rheological data at high frequencies (<1 kHz) using electrocapillary wave measurements. The results provide valuable insights into the interplay between salt presence and interfacial properties of Pluronic F-68 and highlight the challenges of obtaining accurate dilatational rheological data under specific measurement conditions.

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.