通过水和水凝胶之间的介电弛豫强度比测定水凝胶孔隙率。

IF 2.8 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-04-25 DOI:10.1039/D5SM00077G
Maksym M. Lazarenko, Yuriy F. Zabashta, Dmytro. K. Honcharuk, Oleksandr M. Alekseev, Kateryna S. Yablochkova, Liena Yu. Vergun, Dmytro A. Andrusenko, Mykhaylo V. Lazarenko and Leonid A. Bulavin
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引用次数: 0

摘要

我们概述了水凝胶的结构模型,将其概念化为两种成分的组合:固体和柔软。该系统的固体组成部分是带有结合水的膨胀聚合物网络。固体成分形成骨架,其孔隙中含有软成分:自由水。我们也提出了一种方法,基于这个模型,它可以用来确定明胶或琼脂糖为基础的水凝胶的孔隙率。模型中的孔隙度计算为自由水所占体系的相对体积。该方法基于取向缺陷理论,根据该理论,固体中自由水的体积与取向缺陷的浓度成正比。这种浓度的数值也与系统中介电弛豫的强度有关。水凝胶的孔隙度可以由水凝胶的松弛强度与水的松弛强度之比来确定。弛豫的强度是复介电常数虚分量的峰值的高度。因此,水凝胶的孔隙率可以由介电光谱实验推导出来。在聚合物质量浓度为12%和35%时,明胶水凝胶的孔隙率分别为0.48和0.35;当聚合物质量浓度为1.5%和2%时,琼脂糖的孔隙率分别为0.83和0.69。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Determining hydrogel porosity through dielectric relaxation intensity ratios between water and hydrogel†

Determining hydrogel porosity through dielectric relaxation intensity ratios between water and hydrogel†

We outline a structural model of hydrogel that conceptualizes it as a combination of two components: solid and soft. The solid component of the system is the swollen polymer network with bound water. The solid component forms a backbone, whose pores contain the soft component: free water. We also present a method, based on this model, which can be used to determine the porosity of a gelatine- or agarose-based hydrogel. The porosity within the model is calculated as the relative volume of the system occupied by free water. The method is based on the theory of orientational defects, according to which the volume of free water in a solid state is proportional to the concentration of orientational defects. The numerical value of such concentration also correlates with the intensity of dielectric relaxation in a system. The porosity of the hydrogel can be determined as the ratio of the hydrogel's relaxation intensity to water's relaxation intensity. The intensity of the relaxation is the height of the peak of the imaginary component of the complex dielectric permittivity. Consequently, the porosity of a hydrogel can be deduced from the dielectric spectroscopy experiment. We report that the porosity of gelatine hydrogel is 0.48 and 0.35 for the mass concentration of polymer of 12% and 35%, respectively; the porosity of agarose is 0.83 and 0.69 for the mass concentration of the polymer of 1.5% and 2%, respectively.

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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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