Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5451604 | Journal of Materials Science & Technology | 2017 | 15 Pages |
Abstract
The spherical silica particles in narrow size distribution with different diameters of 90ânm, 200ânm, 320ânm and 400ânm were prepared by the modified Stöber method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The phase composition of particles was characterized by X-ray diffraction. The results indicated that each of the silica particle samples was in amorphous state. The shear thickening fluids (STFs) comprising 53 vol.% of silica particles and 47 vol.% of polyethylene glycol with molecular weight of 200âg molâ1 (PEG200) were prepared and evaluated. The influence of size and size distribution on the critical shear rate and the intensity of shear thickening were analyzed. The STFs prepared by silica nanoparticles with a diameter of 90ânm showed the giant rheological effect with the critical shear rate of 2.51âsâ1, the largest viscosity of 45,500âPaâs and the yield stress of 181âkPa. The experiments and the analysis results demonstrated that the suspensions prepared by nanoparticles have high intensity of shear thickening.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Chemistry
Authors
Shuangbing Li, Jixiao Wang, Song Zhao, Wei Cai, Zhi Wang, Shichang Wang,