The Study of Wettability of Nanometer-Particles

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Presentation transcript:

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

What is Electrorheological Fluid ? Wettability Affects ER Effect Research Progress

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.

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

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

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

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

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

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

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

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

Surface Tension Decays while increasing AO in PAO

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

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

THANKS