Dispersion of cellulose nanocrystals and cellulose nanofibers in aqueous suspensions: synergistic effect of concrete superplasticizers

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-10-11 DOI:10.1617/s11527-025-02811-w

Belkis Selma Aouichat, Masoud Hosseinpoor, Ammar Yahia, Mario Dupuis

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Abstract

Achieving optimal dispersion of cellulose nanomaterials (CNMs) is crucial for unlocking their potential to enhance the performance of cement-based materials. This study investigates the synergistic effects of concrete superplasticizers (SPs) in dispersing CNMs within aqueous suspensions. The CNMs examined include cellulose nanocrystals (CNC) and cellulose nanofibers (CNF), each paired with one of three different SPs: polycarboxylate ether (PCE), linear polycarboxylate (PCL), and polynaphtalene sulfonates (PNS). The study primarily evaluated the apparent viscosity (η_app) and storage modulus (G′) to assess dispersion effectiveness. Mechanical stirring proved effective in preparing clean, accessible hydroxyl groups (OH⁻) on the CNMs for chemical modification. Depending on the type of CNMs, mechanical stirring induced distinct rheological behaviors that influenced their dispersion. Moreover, SPs successfully dispersed the investigated CNMs. The surface charge of CNMs governed the adsorption of SPs, which was influenced by the chemical structure of the SPs. Additionally, the aspect ratio of CNMs affected the effectiveness of steric hindrance or electrostatic repulsion in achieving proper dispersion. The findings provide valuable insights and recommendations for dispersing CNMs using concrete SPs.

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纤维素纳米晶体和纤维素纳米纤维在水悬浮液中的分散：混凝土减水剂的协同作用

实现纤维素纳米材料（CNMs）的最佳分散对于释放其增强水泥基材料性能的潜力至关重要。本研究探讨了混凝土减水剂（SPs）在水悬浮液中分散cnm的协同作用。所研究的cnm包括纤维素纳米晶体（CNC）和纤维素纳米纤维（CNF），每一种都与三种不同的sp中的一种配对：聚羧酸盐醚（PCE），线性聚羧酸盐（PCL）和聚萘磺酸盐（PNS）。该研究主要通过表观粘度（ηapp）和储存模量（G’）来评估分散效果。事实证明，机械搅拌可以有效地在cnm上制备干净、可接近的羟基（OH−）进行化学改性。根据cnm的不同类型，机械搅拌诱导了不同的流变行为，影响了它们的分散。此外，SPs成功地分散了所研究的CNMs。CNMs的表面电荷控制着SPs的吸附，而SPs的吸附受其化学结构的影响。此外，cnm的宽高比影响了空间位阻或静电斥力在实现适当色散中的有效性。研究结果为使用混凝土SPs分散cnm提供了有价值的见解和建议。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.