To improve the performance of shear thickening fluids (STFs), we propose the addition of fibrous sepiolite. Through macroscopic rheological tests and microscopic characterization, the effects of different sepiolite mass fractions (0 wt%, 1 wt%, 2 wt% and 3 wt%) on the shear thickening of a SiO-STF system (with a PEG200 dispersion medium) at different ambient temperatures (20 °C, 30 °C, 40 °C and 50 °C) were investigated. Rheological experiments revealed a significant improvement in the shear thickening of SiO-STF with the addition of sepiolite (Sep/SiO-STF), with 7.11- and 1.94-fold increases in absolute and relative shear thickening, respectively. As the sepiolite mass fraction increased from 0 wt% to 3 wt%, the temperature sensitivity coefficient decreased from 13.493 to 4.839, indicating that the Sep/SiO-STF system still exhibited favourable shear thickening at 50 °C. Dynamic oscillatory shear testing revealed that with an increase in sepiolite mass fraction from 0 wt% to 3 wt%, the maximum energy storage modulus, maximum energy dissipation modulus and shear stress increased by 5196.25 %, 1676.16 % and 377.54 %, respectively. Microscopic characterization revealed that sepiolite induced the formation of more clusters in the STF system primarily through the physical adsorption of silica particles and Si–OH on its surface, leading to a significant increase in the shear thickening effect.

中文翻译：

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海泡石对剪切增稠液流变性能的影响及改进机理分析


为了提高剪切增稠流体（STF）的性能，我们建议添加纤维状海泡石。通过宏观流变测试和微观表征，研究了不同海泡石质量分数（0 wt%、1 wt%、2 wt%和3 wt%）对SiO-STF体系（使用PEG200分散介质）剪切增稠的影响研究了不同的环境温度（20°C、30°C、40°C 和 50°C）。流变实验表明，添加海泡石 (Sep/SiO-STF) 后 SiO-STF 的剪切增稠性显着改善，绝对剪切增稠性和相对剪切增稠性分别提高了 7.11 倍和 1.94 倍。随着海泡石质量分数从 0 wt% 增加到 3 wt%，温度敏感性系数从 13.493 下降到 4.839，表明 Sep/SiO-STF 体系在 50 °C 时仍然表现出良好的剪切增稠作用。动态振荡剪切测试表明，随着海泡石质量分数从0 wt%增加到3 wt%，最大储能模量、最大能量耗散模量和剪切应力分别增加了5196.25%、1676.16%和377.54%。微观表征表明，海泡石主要通过二氧化硅颗粒和 Si-OH 在其表面的物理吸附，在 STF 系统中诱导更多团簇的形成，从而导致剪切增稠效应显着增加。