Sedimentation behaviour in electrorheological fluids based on suspensions of zeolite particles in silicone oil

- ERF zeolite suspensions (organophilic, 5A, 13X) prepared in silicone oil.
- Stability of ERFs studied over temperature range of −40 °C to 60 °C.
- Addition of surfactant enhances the long-term stability of ERFs.
- Organophilic ERFs show highest stability over the temperature range studied.
- Novel use of kHz acoustic vibration also enhances stability of organophilic ERFs.