第三组分对纳米二氧化硅STF体系性能的影响

Effect of the Third Component on the Properties of Nanosilica-based STF System

通过添加纳米纤维素(CNF)、氧化石墨烯(GO)或多壁碳纳米管(MWNT)制备了基于纳米二氧化硅的多相剪切增稠液体(STF)。对制得的多相STF体系进行了红外光谱、扫描电子显微镜和流变性能表征。结果表明:CNF由于分散尺度小和提供大量氢键的原因,可以增强纳米二氧化硅STF体系的综合性能,包括稳态流变表征下的临界剪切速率降低和最大增稠黏度增大,动态流变表征下的模量增强响应提前。GO和MWNT的加入则会使STF的性能降低。CNF的增强效果出现先增大后减小的趋势,最佳用量的质量分数为0.2%~0.3%。

In this paper, three types of nanosillica-based multiphase shear thickening fluid(STF) were prepared by adding cellulose nanofiber(CNF), graphene oxide(GO) or multi-walled nanotube(MWNT), respectively, which then underwent infrared spectroscopy, scanning electron microscopy and rheological characterization. The test results show that thanks to its small dispersion scale and large amount of hydrogen bonds, CNF can enhance the properties of the nanosillica-based STF system by such means as reducing its critical shear rate and increasing its maximum thickening viscosity under steady-state rheological characterization, as well as speeding up the modulus enhancement response under the dynamic rheological characterization. The addition of GO and MWNT weakened the performance of the STF system. The optimizing effect of CNF increased first and then decreased. The best dosage range is 0.2%-0.3%.