Production of cellulose nanocrystals using Brønsted Acidic Ionic Liquids (BAILs), based on anionic clusters with changes in the cation and anion's structure

IF 10.7 1区化学 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymers Pub Date : 2025-07-09 DOI:10.1016/j.carbpol.2025.124030

Maria G. Paredes , Francisco Pinto , Felipe Olea , Esteban Quijada-Maldonado , Alessandra Lavoratti , Onajite Abafe Diejomaoh , Jude Laverock , Stephen J. Eichhorn , Paulina Pavez

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引用次数: 0

Abstract

Nine Brønsted Acid Ionic Liquids (BAILs) based on two cationic bases (1-methylimidazolium and pyridinium) and anions derived from sulfuric (SA) and phosphoric (PA) acids, were used as solvents and acid catalysts for the hydrolysis of commercial cellulose to obtain cellulose nanocrystals (CNCs). The BAILs' effect on the reactions was evaluated as a function of the acidity and polarity of the solvents, determined by the Hammett acidity parameter (H₀) (determined experimentally) and by the β parameter of the Kamlet-Taft analysis (determined computationally using COSMOS-RS). Under the same experimental conditions, the change of solvent not only affects the reaction yield of the CNCs but also the final characteristics of the nanomaterials obtained. All CNCs derived from PA-BAILs show a high thermal stability compared to those obtained with SA-BAILs, with T_max values of ~345 °C and 271 °C respectively. Effective surface modification of the CNCs was assessed using X-ray photoelectron spectroscopy (XPS) analysis, Zeta potentials and surface charge density (SCD) determined by conductometric titration. This study provides a solid foundation for the design of ionic liquid-based systems aimed at producing surface-modified CNCs for advanced applications.

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利用Brønsted酸性离子液体（BAILs）制备纤维素纳米晶体，基于阴离子簇，改变正离子和阴离子的结构

以2种阳离子碱（1-甲基咪唑和吡啶）和阴离子（硫酸（SA）和磷酸（PA））为基础，制备了9种Brønsted酸性离子液体（BAILs）作为溶剂和酸性催化剂，用于纤维素水解制备纤维素纳米晶体（CNCs）。通过Hammett酸度参数（H0）（实验确定）和Kamlet-Taft分析的β参数（使用COSMOS-RS计算确定）来评估BAILs对反应的影响，并将其作为溶剂酸度和极性的函数。在相同的实验条件下，溶剂的变化不仅会影响纳米材料的反应产率，还会影响所得纳米材料的最终性能。与SA-BAILs相比，所有由PA-BAILs获得的cnc都表现出较高的热稳定性，Tmax分别为~345℃和271℃。采用x射线光电子能谱（XPS）分析、电导滴定法测定Zeta电位和表面电荷密度（SCD）来评估cnc表面改性的有效性。该研究为离子液体基系统的设计提供了坚实的基础，旨在生产用于高级应用的表面改性cnc。

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

Carbohydrate Polymers 化学-高分子科学

CiteScore

22.40

自引率

8.00%

发文量

1286

审稿时长

47 days

期刊介绍： Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.