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Research Article | Open Access | Just Accepted

Enhanced dispersion stability of shear thickening fluid based on PS@ZIF-8 core-shell nanospheres and ionic liquids for functional applications

Bingbing Lai1,2Jianglin Yin3Qin Zhao1( )Mengke Zhang1,2Gaiqing Zhao1,2( )Xiaobo Wang1,2

1 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

2 Qingdao Center of Resource Chemistry and New Materials, Qingdao 266100, China

3 Qingdao Lubemater Lubrication Material Technology Co., Ltd, Qingdao 266100, China

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Abstract

Material failures caused by load impacts frequently result in significant economic losses and negative effects. The application expansion of shear thickening fluid (STF) under special impact conditions is expected to design a prospective impact-resistant structure due to its shear thickening effect with instantaneous response and reversible viscosity change. Herein, core-shell nanospheres (PS@ZIF-8) were synthesized using polystyrene (PS) nanoparticles as the base template. PS@ZIF-8 was used as the unique dispersed phase and introduced uniformly into hydroxyl-functionalized ionic liquids (ILs) by simple ball mill dispersion to obtain novel STF systems. The important performance of novel STF systems such as the critical shear viscosity and the peak viscosity could be enhanced with the increase in PS@ZIF-8 content. Importantly, the STF systems retained a significant shear thickening effect even after several shear scanning cycles due to the interaction between the dispersed phase (PS@ZIF-8) and the dispersion medium (ILs). The structural stability of PS@ZIF-8 in ionic liquids was also investigated, and the STF suspensions exhibited excellent stability in quantitative comparison experiments after centrifugal disruption at 8000 rpm and standing for 60 days. In addition, a loading impacts experimental method was developed to better investigate the anti-impact-wear performance of STF systems filled in a limited space. The outcomes of tests show that the novel STF systems had outstanding flexibility in energy absorption capacity and impact wear resistance. This study provided a strategy to prevent material failure under load impact and highlighted the potential of this novel STF systems for designing efficient and stable impact-resistant structures.

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Cite this article:
Lai B, Yin J, Zhao Q, et al. Enhanced dispersion stability of shear thickening fluid based on PS@ZIF-8 core-shell nanospheres and ionic liquids for functional applications. Friction, 2025, https://doi.org/10.26599/FRICT.2025.9441068

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Received: 13 October 2024
Revised: 01 January 2025
Accepted: 22 January 2025
Available online: 23 January 2025

© The Author(s) 2025.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).

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