Fundamentals of and advances in nanocellulose and nanochitin systems

IF 9.9 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Industrial and Engineering Polymer Research Pub Date : 2023-10-01 DOI:10.1016/j.aiepr.2023.04.003
Soo-Ah Jin , Richard J. Spontak
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引用次数: 1

Abstract

Due to the deleterious environmental consequences resulting from a broad spectrum of synthetic polymers during use or post-application disposal, interest in biomaterials obtained from eco-friendly and sustainable sources is growing. This review first examines some of the fundamental concepts regarding biologically-derived nanoparticles (“bionanoparticles”) extracted from the two most prevalent polymers on the planet: natural cellulose and chitin. With this background established, we turn our attention to several advances in this expanding field. Recent rheological studies have established that a “kink” often reported in steady-shear tests of fibrous nanocellulose suspensions is related to anisotropic flocs. Thorough analysis of this observation demonstrates the existence of dual yield points that pinpoint the processing conditions over which these flocs form. Another advance is isothermal titration calorimetry, which relates the formation of structure to viscous heating and provides a uniquely quick and precise analysis tool for measuring the concentration of cellulose nanocrystals responsible for the onset of mesomorphism in aqueous suspensions. In addition, the incorporation of various electrolytes in aqueous nanocellulose or nanochitin suspensions is capable of promoting cellulose or chitin nanocrystal (de)swelling or suspension templating of solid films, and positron annihilation lifetime spectroscopy can be used to follow changes in nanoscale free volume upon swelling in the presence of moisture, which can be independently used in conjunction with CO2-philic ionic liquids to achieve highly selective carbon capture in hybrid gas-separation membranes.

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纳米纤维素和纳米甲壳素系统的基本原理和进展
由于广泛的合成聚合物在使用或应用后处理过程中会产生有害的环境后果,人们对从环保和可持续来源获得的生物材料越来越感兴趣。这篇综述首先考察了从地球上最常见的两种聚合物:天然纤维素和甲壳素中提取的生物衍生纳米颗粒(“bionanoparticles”)的一些基本概念。在这种背景下,我们将注意力转向这一不断扩大的领域中的一些进展。最近的流变学研究已经证实,在纤维纳米纤维素悬浮液的稳定剪切试验中经常报告的“扭结”与各向异性絮体有关。对这一观察结果的彻底分析表明,存在着精确确定这些絮凝物形成的加工条件的双屈服点。另一个进展是等温滴定量热法,它将结构的形成与粘性加热联系起来,并提供了一种独特的快速和精确的分析工具来测量导致水悬浮液中介晶开始的纤维素纳米晶体的浓度。此外,在含水纳米纤维素或纳米几丁质悬浮液中掺入各种电解质能够促进纤维素或几丁质纳米晶体(去)溶胀或固体膜的悬浮液模板化,并且正电子湮没寿命谱可用于跟踪在水分存在下溶胀时纳米级自由体积的变化,其可以独立地与亲CO2离子液体结合使用,以在混合气体分离膜中实现高度选择性的碳捕获。
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来源期刊
Advanced Industrial and Engineering Polymer Research
Advanced Industrial and Engineering Polymer Research Materials Science-Polymers and Plastics
CiteScore
26.30
自引率
0.00%
发文量
38
审稿时长
29 days
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