Abstract In this study, investigations have been carried out on the effect of a few important parameters such as molecular weight and concentration of dispersant (polyethyleneimine) as well as that of pH on the rheological behaviour of aqueous suspension comprising silicon carbide (SiC) nanoparticles. In addition to this, the effect of particle size and addition of finer SiC particles on the rheological behaviour of SiC suspension have been examined. It is observed that viscosity of suspension increases with the increase in molecular weight of dispersant and decreases as the concentration of dispersant increases. Further, it is noticed that viscosity of the suspension progressively increases below the pH ≈ 7.6 and above the pH ≈ 9.3, indicating that minimum viscosity i.e. maximum stabilization of suspension is obtained within the pH range of ≈ 7.6–9.3. It has been observed that variation of SiC particle size from submicrometer to nanometer range and addition of nanometric SiC powder in SiC suspension containing coarser particles increase the viscosity significantly.

中文翻译：

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几个重要参数对碳化硅纳米颗粒分散水悬浮液流变行为的影响

摘要 在这项研究中，研究了一些重要参数，如分散剂（聚乙烯亚胺）的分子量和浓度以及 pH 值对包含碳化硅 (SiC) 纳米颗粒的水性悬浮液流变行为的影响。除此之外，还研究了粒度和添加更细的 SiC 颗粒对 SiC 悬浮液的流变行为的影响。观察到悬浮液的粘度随着分散剂分子量的增加而增加，并随着分散剂浓度的增加而降低。此外，注意到悬浮液的粘度在低于 pH ≈ 7.6 和高于 pH ≈ 9.3 时逐渐增加，表明在 ≈ 7 的 pH 范围内获得最小粘度，即悬浮液的最大稳定性。6–9.3。已经观察到，SiC 粒径从亚微米到纳米范围的变化以及在含有粗颗粒的 SiC 悬浮液中添加纳米 SiC 粉末会显着增加粘度。