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Katja A. Fröhlich, Eleni Mitrentsis, Frank Clemens, Botho Hoffmann, Véronique Michaud, Thomas Graule
Assessment of the Dispersion Quality of refractive index-matched nanodispersions
Appl. Rheol. 26:6 (2016) 65050 (10 pages)
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Dispersion quality has a large influence on the resulting properties of filled polymers, hybrids and nanocomposites in general.
Reducing the van der Waals forces and therefore, matching the refractive index between the filler and the matrix should
improve dispersion in hybrid materials. However, in this case the usual light-based techniques cannot be used to assess dispersion
quality. In this work, dispersions containing silica nanoparticles and a solvent mixture of 1-butanol and benzyl alcohol
were analysed by rheological methods. The refractive index of the solvent was changed by varying the mixing ratio, and thus
the effect of index difference on the filler-matrix interaction was investigated. In agreement with theory, a stronger gel network
was observed when the refractive index of filler and solvent were matched. If the difference in refractive index of the two
materials became too large, particles and solvent interaction was reduced, and agglomerates were formed. This resulted in a
weaker gel network.
► Cite this publication as follows:
Frohlich KA, Mitrentsis E, Clemens F, Hoffmann B, Michaud V, Graule T: Assessment of the Dispersion Quality of refractive index-matched nanodispersions, Appl. Rheol. 26 (2016) 65050.
M. Soutrenon, V. Michaud, J-A.E. Manson
Influence of processing and storage on the shear thickening properties of highly concentrated monodisperse silica particles in polyethylene glycol
Appl. Rheol. 23:5 (2013) 54865 (9 pages)
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The shear thickening behavior of concentrated suspensions can be exploited to dissipate energy during impact or shear loading.
To preserve the consistency of the thickening behavior in practical applications, particle concentration, and dispersion
should be kept within very close bounds over time. In this article, we analyze the influence of the processing methods and
storage conditions on the rheological properties of shear thickening fluids (STF) based on monodisperse suspensions of silica
particles in polyethylene glycol. Particle dispersion linked to processing method and time strongly influences the value of
the critical shear rate and storage in contact with air and humidity is responsible for a change in particle concentration.
Encapsulating the suspensions in silicone is proposed as a solution to preserve their rheological properties over time.
► Cite this publication as follows:
Soutrenon M, Michaud V, Manson JAE: Influence of processing and storage on the shear thickening properties of highly concentrated monodisperse silica particles in polyethylene glycol, Appl. Rheol. 23 (2013) 54865.
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