Rheological properties of magnetorheological suspensions stabilized with nanocelluloses

Yuankun Wang; Wenyuan Xie; Defeng Wu

doi:10.1016/j.carbpol.2019.115776

Rheological properties of magnetorheological suspensions stabilized with nanocelluloses

Carbohydr Polym. 2020 Mar 1:231:115776. doi: 10.1016/j.carbpol.2019.115776. Epub 2019 Dec 23.

Authors

Yuankun Wang¹, Wenyuan Xie², Defeng Wu³

Affiliations

¹ School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, 225002, PR China.
² School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, 225002, PR China; Institution of Innovative Materials & Energy, Yangzhou, Jiangsu Province, 225002, PR China.
³ School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu Province, 225002, PR China; Provincial Key Laboratories of Environmental Engineering & Materials, Yangzhou, Jiangsu Province, 225002, PR China. Electronic address: dfwu@yzu.edu.cn.

PMID: 31888834
DOI: 10.1016/j.carbpol.2019.115776

Abstract

Two kinds of anisotropic cellulosic nanoparticles, cellulose nanocrystal (CNC) and nanofiber (CNF), were used as additives for the aqueous carbonyl iron particles (CIPs) based magnetorheological (MR) fluids, aiming at disclosing effect of nanocelluloses on the magneto-responsive behavior and stability of MR fluids. Both CNC and CNF can stabilize MR fluids, and improve their sensitivity to alterations of magnetic field strengths. Relative to electrostatic repulsion, physical hindrance is more important to the stability improvement. Thus, CNF is the better option because it has higher aspect ratio and surface charge. Moreover, the presence of cellulosic nanoparticles hinders coalescence of CIP chains to stronger columns, and hence the nanoparticles stabilized MR fluids show thixotropy evidently. At the comparative concentration (0.3 wt%), the presence of CNF even enhances the magneto-responsive levels because the percolated CNF network acts as stress amplifier. This work opens up a new door for applications of nanocelluloses in MR fluids.

Keywords: Cellulose nanocrystals; Cellulose nanofibers; Magnetorheological fluids; Rheology.