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Published in: Rheologica Acta 9/2023

24-07-2023 | Original Contribution

Influence of dispersion liquid and silica concentration on rheological properties of shear thickening fluids (STFs)

Authors: Abdulhalim Aşkan, Mahmut Çapkurt, Emre Acar, Murat Aydın

Published in: Rheologica Acta | Issue 9/2023

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Abstract

The rheological behavior of shear thickening fluid suspensions synthesized using three dispersion liquids, namely polyethylene glycol, glycerin, and diethylene glycol, having different numbers of hydroxyl groups at the ends of the chain and distinct chain lengths, was researched. The primary objective of this study is to investigate the effects of the length of the chain molecular, the number of –OH groups at the ends of the chain, and the density of dispersion liquids on the rheological behavior. Evaluations were made by taking into account the thickening ratio which expresses the maximum change in the viscosity of the fluid relative to the initial viscosity and the thickening period which states the difference between the shear rate at which the maximum viscosity is obtained and the critical shear rate. As a result of the evaluation made by considering these parameters, the rheological performance of shear thickening fluid suspensions synthesized with liquids having longer molecular chain lengths, higher –OH number, and higher density came to the fore. Samples synthesized with glycerin, which have more hydroxyl groups at the molecular chain ends, provided a more stable distribution by making stronger hydrogen bonds with silica. This situation significantly reduced the thinning behavior in the first region of the rheology curves and provided a stable and continuous thickening behavior after the critical shear rate. In addition, with the increase in the silica ratio, the thickening situation changed from continuous to discontinuous. Increment of silica also decreased the critical shear rate while increasing the initial and maximum viscosity. Increasing the silica content from 22 to 26% resulted in the thickening ratio increasing by 686% from 6.6 to 45 in the samples synthesized with polyethylene glycol while decreasing the thickening period from 559 to 41.2. Similar situations are observed in the samples synthesized with glycerin and diethylene glycol. All of the samples obtained exhibited a reversible behavior rheologically. When the applied shear rate was removed, the sample returned to its former fluid state. Moreover, suspensions synthesized by mixing dispersion liquids showed superior performance compared to single-liquid samples. It is thought that the dispersion liquids interact to form a branched network by making more bonds both with each other and with the silica particles, and it provides an increase in the resistance of the fluid against deformation under high shear stress.

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Literature
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go back to reference Santos TF, Santos CM, Fonseca RT, Melo KM, Aquino MS, Oliveira FR, Medeiros JI (2020) Experimental analysis of the impact protection properties for Kevlar® fabrics under different orientation layers and non-Newtonian fluid compositions. J Compos Mater 54(24):3515–3526. https://doi.org/10.1177/0021998320916231CrossRef Santos TF, Santos CM, Fonseca RT, Melo KM, Aquino MS, Oliveira FR, Medeiros JI (2020) Experimental analysis of the impact protection properties for Kevlar® fabrics under different orientation layers and non-Newtonian fluid compositions. J Compos Mater 54(24):3515–3526. https://​doi.​org/​10.​1177/​0021998320916231​CrossRef
Metadata
Title
Influence of dispersion liquid and silica concentration on rheological properties of shear thickening fluids (STFs)
Authors
Abdulhalim Aşkan
Mahmut Çapkurt
Emre Acar
Murat Aydın
Publication date
24-07-2023
Publisher
Springer Berlin Heidelberg
Published in
Rheologica Acta / Issue 9/2023
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-023-01406-y

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