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Nakonieczna, Paulina
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article
Rheological properties and stability of shear thickening fluids based on silica and polypropylene glycol
Abstract
Rheological behavior and structural stability of shear thickening fluids (STFs) based on amorphous silica KE-P50 (500–600 nm) and polypropylene glycol, with molar mass 2000 g mol−1, were studied. The static and dynamic rheological measurements were performed using rheometer ARES and stability tests were carried out using the static multiple light scattering (S-MLS) method. The preliminary tests were performed for the STFs having 50–55 vol% of silica and the detailed studies were carried out for two fluids, with 50 and 53 vol% of silica, respectively. All the STFs studied exhibit shear thickening properties. Both, the zero-shear-viscosities and maximal viscosities increase with growing silica content. For the shear rates studied the viscous component of the shear modulus dominates over the elastic one. S-MLS tests showed that both the suspensions studied exhibit excellent stability over the 8 days of the test. The synthesized STFs can be used as a component of flexible energy absorbing and protecting structures.