Insights into controlling bacterial cellulose nanofiber film properties through balancing thermodynamic interactions and colloidal dynamics†

IF 3.2 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
Aban Mandal, Kuotian Liao, Hareesh Iyer, Junhao Lin, Xinqi Li, Shuai Zhang and Eleftheria Roumeli
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Abstract

In recent years, nanocellulose has emerged as a sustainable and environmentally friendly alternative to traditional petroleum-derived structural polymers. Sourced either from plants, algae, or bacteria, nanocellulose can be processed into colloid, gel, film and fiber forms. However, the required fundamental understanding of process parameters that govern the morphology and structure–property relationships of nanocellulose systems, from colloidal suspensions to bulk materials, has not been developed and generalized for all forms of cellulose. This further hinders the more widespread adoption of this biopolymer in applications. Our study investigates the dispersion of cellulose nanofibers (CNFs) produced by a bacterial–yeast co-culture, in solvents, highlighting the role of thermodynamic interactions in influencing their colloidal behavior. By adjusting Hansen solubility parameters, we controlled the thermodynamic relationship between CNFs and solvents across various concentrations, studying the dilute to semi-dilute regimes. Rheological measurements revealed that the threshold at which a concentration-based regime transition occurs is distinctly solvent-dependent. Complementing rheological analysis with small angle X-ray scattering and zeta potential measurements, our findings reveal that enhancing CNF–solvent interactions increases excluded volume in the dilute regime, emphasizing the importance of the balance between fiber–fiber and fiber–solvent interactions. Moreover, we investigated the transition from colloidal to solid state by creating films from dispersions with varying interaction parameters in semi-dilute regimes. Through mechanical testing and scanning electron microscopy imaging of the fracture surfaces, we highlight the significance of electrokinetic effects in such transitions, as dispersions with higher electrokinetic stabilization gave rise to stronger and tougher films despite having less favorable thermodynamic interaction parameters. Our work provides insights into the thermodynamic and electrokinetic interplay that governs bacterial CNF dispersion, offering a foundation for future application and a deeper understanding of nanocellulose's colloidal and structure-property relationships.

Abstract Image

通过平衡热力学相互作用和胶体动力学控制细菌纤维素纳米纤维膜特性的启示
近年来,纳米纤维素已成为传统石油衍生结构聚合物的可持续环保替代品。纳米纤维素来源于植物、藻类或细菌,可加工成胶体、凝胶、薄膜和纤维等形式。然而,对于纳米纤维素系统(从胶体悬浮液到块状材料)的形态和结构-性能关系所需的工艺参数的基本了解,还没有针对所有形式的纤维素进行开发和普及。这进一步阻碍了这种生物聚合物的广泛应用。我们的研究调查了细菌-酵母共培养产生的纤维素纳米纤维(CNFs)在溶剂中的分散情况,强调了热力学相互作用在影响其胶体行为中的作用。通过调整汉森溶解度参数,我们控制了不同浓度的 CNFs 和溶剂之间的热力学关系,研究了稀释到半稀释体系。流变测量结果表明,发生基于浓度的体系转换的阈值明显取决于溶剂。通过小角 X 射线散射和 zeta 电位测量对流变学分析进行补充,我们的研究结果表明,增强 CNF 与溶剂之间的相互作用会增加稀释体系中的排除体积,从而强调了纤维与纤维之间以及纤维与溶剂之间相互作用平衡的重要性。此外,我们还通过在半稀释状态下利用不同的相互作用参数从分散体中生成薄膜,研究了从胶体状态到固态状态的转变。通过对断裂表面进行机械测试和扫描电子显微镜成像,我们强调了电动力学效应在这种转变中的重要性,因为尽管热力学相互作用参数不太有利,但具有较高电动力学稳定性的分散体却能产生更强、更坚韧的薄膜。我们的工作深入揭示了支配细菌 CNF 分散的热力学和电动相互作用,为未来的应用奠定了基础,并加深了对纳米纤维素胶体和结构-性能关系的理解。
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
Molecular Systems Design & Engineering
Molecular Systems Design & Engineering Engineering-Biomedical Engineering
CiteScore
6.40
自引率
2.80%
发文量
144
期刊介绍: Molecular Systems Design & Engineering provides a hub for cutting-edge research into how understanding of molecular properties, behaviour and interactions can be used to design and assemble better materials, systems, and processes to achieve specific functions. These may have applications of technological significance and help address global challenges.
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