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Saito, Y., Hirose, Y. and Otsubo, Y. (2011) Shear-Induced Reversible Gelation of Nanoparticle Suspensions Flocculated by Poly(Ethylene Oxide). Colloids and Surfaces A: Physicochemical and Engineering Aspects, 384, 40-46.
https://doi.org/10.1016/j.colsurfa.2011.03.017

has been cited by the following article:

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

  AUTHORS: Yuji Hirose

  KEYWORDS: Suspension, Nanoparticles, Shake Gel, Sol-Gel Transition, Electric Double Layer

  JOURNAL NAME: Materials Sciences and Applications, Vol.8 No.5, May 15, 2017

  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.