1. The Study of Wettability of Nanometer-Particles
Zhou Luwei
Fang Zhengnan, Ji Fei

2. What is Electrorheological Fluid ?
Wettability Affects ER Effect
Research Progress

3. Electrorheological Fluid
Colloidal electrorheological (ER) fluids are a suspension make of nanometer-sized dielectric particles in an insulating carrier liquid.
The reversible liquid-solid transition happens in a several milliseconds when a external electric field exerted.

4. Electrorheological Fluid
Mechanism of ER Fluid
Optical microscope image of a sample prepared in epoxy, solidified under an applied field E of 2kVmm–1.Columns aligned along the field direction are visible.
An anisotropic network microstructure model for ER fluids under a strong electronic field

5. Electrorheological Fluid
wetter particles, better dispersity, direct affect the ER effect.
Chemical Physics Letters 441 (2007) 314–317

6. Surface Tension
strength of ER fuild
(PAO + AO)
wettability
(contact angle)

7. the Olympus microscopy with a CCD camera
Contact Angel
the Olympus microscopy with a CCD camera

8. Contact Angel a typical stable capillary rise front
1 mm
a particle with PAO10 capillary rise front

9. analyzed sample with 10 seconds per slide
Contact Angel
analyzed sample with 10 seconds per slide

10. Contact Angel the PAO(10) capillary rise front height in 1000 seconds
contact angel of particals in PAO(10)
the PAO(10) capillary rise velocity change in 1000 seconds

11. Kyowa Surface TensioMeter CBVP-A2
Surface Tension
Washburn Method
Kyowa Surface TensioMeter CBVP-A2

12. Surface Tension Decays while increasing AO in PAO

13. Clearly Shows the Yield Stress decay with OA
Shear Strength
Clearly Shows the Yield Stress decay with OA

14. Surface Tension Decays while increasing AO in PAO
Clearly Shows the Yield Stress decay with OA
contact angel of particle in PAO(10)
a typical stable capillary rise front
1 mm
a particle with PAO10 capillary rise front

15. THANKS