The combined effects of electrolyte addition and mechanical shearing on cellulose nanocrystal alignment

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2024-10-22 DOI:10.1007/s10570-024-06204-0

Ananya Ghosh, Sadat Kamal Amit, Virginia A. Davis, Zhihua Jiang

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Abstract

This research explored the impact of four different electrolytes on the orientation of cellulose nanocrystals (CNCs) in shear-cast films prepared from aqueous CNC gels. Changes in the aqueous CNC gels’ rheological properties with electrolyte addition were correlated to the orientation and optical properties of dried CNC films. Film alignment was qualitatively assessed using cross-polarized optical microscopy and quantified by order parameters computed by UV–Vis transmission spectroscopy. Electrolyte addition resulted in an increased alignment in dried CNC films. For pure CNCs, the film order parameters remained constant at approximately 0.3 for shear rates from 20 s⁻¹ to 100 s⁻¹. However, higher order parameters were achieved in the presence of electrolytes. Notably, an order parameter of 0.88 was achieved at a shear rate of only 20 s⁻¹. In addition, films produced from dispersions containing electrolytes exhibited improved clarity and haze. The results of this work highlight that electrolyte addition can enable higher order parameters at lower shear rates and facilitate the development of aligned CNC films for applications such as polarizers, clear coatings, and piezoelectric materials.

Graphical abstract

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电解质添加和机械剪切对纤维素纳米晶排列的综合影响

本研究探讨了四种不同电解质对由水性 CNC 凝胶制备的剪切铸造薄膜中纤维素纳米晶体（CNC）取向的影响。加入电解质后，水性 CNC 凝胶流变特性的变化与干燥 CNC 薄膜的取向和光学特性相关联。使用交叉偏振光学显微镜对薄膜的排列进行了定性评估，并通过紫外可见透射光谱计算出的阶次参数对其进行了量化。加入电解质后，干燥的 CNC 薄膜排列更加整齐。对于纯 CNC，在剪切速率为 20 s-1 至 100 s-1 的条件下，薄膜阶次参数保持稳定，约为 0.3。然而，在有电解质存在的情况下，薄膜的有序参数更高。值得注意的是，在剪切速率仅为 20 s-1 时，薄膜的有序参数达到了 0.88。此外，用含有电解质的分散体生产出的薄膜显示出更高的透明度和雾度。这项工作的结果突出表明，添加电解质可以在较低的剪切速率下获得较高的阶次参数，并促进了排列整齐的 CNC 薄膜的开发，可用于偏振片、透明涂层和压电材料等应用领域。

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

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.