Elaboration, synthesis and characterisation by conductometric study of chitosan materials in water

IF 1.2 4区化学 Q4 CHEMISTRY, PHYSICAL

Physics and Chemistry of Liquids Pub Date : 2023-01-30 DOI:10.1080/00319104.2023.2168664

Afef Ben Yahya, E. Cherif

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Abstract

ABSTRACT Biopolymers are common ingredients in medical, technological, and industrial products. This paper presents the experimental analysis of conductometric properties of polysaccharides of chitosan (CH) in solutions in water W. The electrical conductivity was measured under the influence of increasing concentration of (0.5 to 10) g/l and increasing temperature of (288.15 to 318.15) K. The reduced electrical conductivity and the activation energy of reduced electrical conductivity Eσ are calculated. Biopolymer solutions exhibit a critical recovery of intrinsic electrical conductivity and a critical concentration c*, separating solutions into dilute solutions and semi-dilute solutions. The dependencies of the activation energy with solution concentration and intrinsic electrical conductivity are discussed. The polysaccharide CH behaviour can be extrapolated from the Flory-Huggins theory by decomposing such as . Where the is the entropy-originated term that reflects the tendency of molecules to adopt as many configurations as possible on the network and the is associated with the energy variation that occurs when two molecules of different species are brought into contact. This enthalpy contribution represents well the non-Arrhenius behaviour. Principles that aid one to understand and interpret such results are discussed.

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壳聚糖材料在水中的制备、合成及电导表征

生物聚合物是医疗、技术和工业产品中的常见成分。本文对壳聚糖(CH)在w水溶液中的电导率进行了实验分析，测定了其在浓度(0.5 ~ 10)g/l和温度(288.15 ~ 318.15)k的影响下的电导率，计算了其还原电导率和还原电导率的活化能Eσ。生物聚合物溶液表现出本质电导率的临界恢复和临界浓度c*，将溶液分为稀溶液和半稀溶液。讨论了活化能与溶液浓度和本征电导率的关系。多糖的CH行为可以通过分解，从弗洛里-哈金斯理论推断出来。其中，为熵源项，反映了分子在网络中尽可能多地采用构型的倾向，与两个不同种类的分子接触时发生的能量变化有关。这个焓贡献很好地代表了非阿伦尼乌斯的行为。本文讨论了帮助人们理解和解释这些结果的原则。

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来源期刊

Physics and Chemistry of Liquids 化学-物理：凝聚态物理

CiteScore

3.30

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Physics and Chemistry of Liquids publishes experimental and theoretical papers, letters and reviews aimed at furthering the understanding of the liquid state. The coverage embraces the whole spectrum of liquids, from simple monatomic liquids and their mixtures, through charged liquids (e.g. ionic melts, liquid metals and their alloys, ions in aqueous solution, and metal-electrolyte systems) to molecular liquids of all kinds. It also covers quantum fluids and superfluids, such as Fermi and non-Fermi liquids, superconductors, Bose-Einstein condensates, correlated electron or spin assemblies. By publishing papers on physical aspects of the liquid state as well as those with a mainly chemical focus, Physics and Chemistry of Liquids provides a medium for the publication of interdisciplinary papers on liquids serving its broad international readership of physicists and chemists.