The spherical silica particles in narrow size distribution with different diameters of 90 nm, 200 nm, 320 nm and 400 nm were prepared by the modified St？ber method and characterized by scanning electron microscopy（...The spherical silica particles in narrow size distribution with different diameters of 90 nm, 200 nm, 320 nm and 400 nm were prepared by the modified St？ber 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 200 g mol^（-1）（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 of90 nm showed the giant rheological effect with the critical shear rate of 2.51 s^（-1）, the largest viscosity of45,500 Pa·s and the yield stress of 181 kPa. The experiments and the analysis results demonstrated that the suspensions prepared by nanoparticles have high intensity of shear thickening.展开更多
基金supported by the Public Science and Technology Research Funds Projects of Ocean (No. 201405013-5)the Program of Introducing Talents of Discipline to Universities (No. B06006)+1 种基金the National Natural Science Foundation of China (No. 20836006)the National High Technology Research and Development Program (Nos. 2012AA03A611 and SKL-Ch E-12T12)
文摘The spherical silica particles in narrow size distribution with different diameters of 90 nm, 200 nm, 320 nm and 400 nm were prepared by the modified St？ber 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 200 g mol^（-1）（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 of90 nm showed the giant rheological effect with the critical shear rate of 2.51 s^（-1）, the largest viscosity of45,500 Pa·s and the yield stress of 181 kPa. The experiments and the analysis results demonstrated that the suspensions prepared by nanoparticles have high intensity of shear thickening.
