Materials Sciences and Applications

Volume 8, Issue 5 (May 2017)

ISSN Print: 2153-117X   ISSN Online: 2153-1188

Google-based Impact Factor: 1.67  Citations  h5-index & Ranking

Rheological Behavior of Nanosilica Suspensions in Poly(Ethylene Oxide) Solutions with Sodium Chloride

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DOI: 10.4236/msa.2017.85022    1,271 Downloads   1,863 Views  Citations
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ABSTRACT

Suspensions of silica nanoparticles showed shear-thickening profiles under steady shear conditions up on addition of a small amount of poly(ethylene oxide) (PEO). The suspensions turned into gels upon shaking and their fluidity was recovered several minutes after resting. We studied the rheological properties of these shake gels with small amounts of sodium chloride (NaCl). Gelation occurred at lower shear rates upon addition of small amounts of NaCl. In addition, the time taken by the gelated samples to recover their original viscosity increased with the increasing NaCl content. The weakened repulsive interactions between the silica particles upon NaCl addition lead to particles in closer proximity, and three-dimensional networks of PEO chains are easily formed as the electric double layer of the particles becomes thinner.

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Hirose, Y. (2017) Rheological Behavior of Nanosilica Suspensions in Poly(Ethylene Oxide) Solutions with Sodium Chloride. Materials Sciences and Applications, 8, 333-341. doi: 10.4236/msa.2017.85022.

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