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Controlling the shear thickening behavior of suspensions by changing the surface properties of dispersed microspheres

机译：通过改变分散的微球的表面性能来控制悬浮液的剪切增厚行为

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摘要

To investigate the effect of the surface properties of dispersed particles on the shear thickening behavior of their corresponding suspensions and further control this characteristic, three kinds of suspensions were prepared by mixing SiO2, SiO2-NH2, and SiO2-COOH microspheres with a poly(ethylene glycol) fluid medium, and their rheological behavior was analyzed carefully. Compared to the SiO2 microsphere suspension, the SiO2-NH2 and SiO2-COOH microsphere suspensions show a weaker thickening behavior and a greater critical shear rate due to the aggregation tendency caused primarily by the organic chains. Moreover, the rheological behavior of the three suspensions display different dependencies on the pH value, which is comprehensively determined by the interaction between the microspheres and the medium. Moreover, the critical shear stress of suspensions with different pH values could be predicted by the Wagner model, which basically proves that the interaction between the particles significantly influences the beginning of thickening. The thickening degree could be interpreted by friction theory. The critical volume fraction corresponding to the onset of discontinuous shear thickening is determined by the friction coefficient between the particles, which is greatly affected by the pH value.
机译：为了研究分散颗粒的表面性质对它们相应的悬浮液的剪切增厚行为的影响并进一步控制该特征，通过将SiO 2，SiO 2-NH 2和SiO 2-CoOH微球与聚（乙烯）混合来制备三种悬浮液甘黄油介质，并仔细分析流变行为。与SiO2微球悬浮液相比，SiO 2-NH 2和SiO2-CoOH微球悬浮液显示出较弱的增稠行为和由于主要由有机链引起的聚集倾向而具有更大的临界剪切速率。此外，三个悬浮液的流变行为在pH值上显示不同的依赖性，其通过微球和介质之间的相互作用综合地确定。此外，瓦格纳模型可以预测具有不同pH值的悬浮液的临界剪切应力，这基本证明颗粒之间的相互作用显着影响增厚的开始。增稠度可以通过摩擦理论来解释。对应于不连续剪切增厚的发作对应的临界体积分数由颗粒之间的摩擦系数决定，其受pH值大受影响。

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  • 来源
    《RSC Advances》 |2019年第6期|共10页
  • 作者

    Chen Yi; Zhou Yueyun; Pi Hejie; Zeng Guangsheng;

  • 作者单位

    Hunan Univ Technol Coll Urban &

    Environm Sci Hunan Prov Key Lab Comprehens Utilizat Agr &

    Anim Zhuzhou 412007 Peoples R China;

    Hunan Univ Technol Coll Urban &

    Environm Sci Hunan Prov Key Lab Comprehens Utilizat Agr &

    Anim Zhuzhou 412007 Peoples R China;

    Hunan Univ Technol Coll Urban &

    Environm Sci Hunan Prov Key Lab Comprehens Utilizat Agr &

    Anim Zhuzhou 412007 Peoples R China;

    Hunan Univ Technol Hunan Prov Engn Lab Key Tech Nonmetall Packaging Zhuzhou 412007 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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