Abstract
Simultaneous observations of the electro-rheological (ER) effect and flow behavior within micro-gap were performed for a nano-suspension based on nano-particles of titanium dioxide and a chemically modified silicone oil stored for a long time. The ER effect and flow behavior in the presence of sinusoidal electric field simultaneously observed were discussed. In the presence of the sinusoidal electric field of 1 kHz, a chain-like microstructure spanning the two electrodes was induced for the nano-suspension stored for 28 months. The stability of the flow and the ER response was fairly well even for the stored nano-suspension in the presence of the sinusoidal electric field of 1 kHz. However, simultaneous observations showed substantial wall slip of the nano-suspension. The ER effect was also discussed in terms of a dimensionless relationship between the induced stress and Mason number, which is a characteristic ratio of viscous forces to polarization forces acting on a particle.
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