Dielectro-Rheological Device (DRD)

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Presentation transcript:

Dielectro-Rheological Device (DRD)

Dielectric Spectroscopy: The measurement Electrical current flowing through a sample as a response to an alternating electric field is measured as a function of the field frequency Dielectric spectrum gives information on structure and behavior of the material Voltage Voltage application DC or AC voltage + Dielectric + Induction of an - electric field - LCR meter Current Measurement of the flowing current

Dielectro-Rheological Device (DRD) Setup for Peltier and CTD chambers available Contact at upper geometry by spring (Rotation) or wire (Oscillation) Applications Filled rubbers Polymers nanocomposites carbon nanotubes clays Battery research Conductivity of filled polymers

Rheo-Dielectric-Spectroscopy Dielectro Rheological Device DRD An electrical potential is applied by a spring system onto the shaft and the capacitance is measured. Measuring Plate PP25/PP50 Peltier The bottom measuring plate is isolated to the Rheometer Goldspring or -wire contact Contact Ceramic isolation Counter Cooling Sample Uniform temperature distribution with Peltier Hood (-40°C - +200°C)

Dielectro Rheology Example: Polymer Carbon Black Composite Carbon black clusters dispersed in a polymer matrix. Carbon black induces dielectric properties in the composite. Rheology: (Shear stress: 65400 Pa) Dielectricity: (Frequency: 1 kHz) Slow mechanical relaxation of long chain polymers Fast electrical relaxation of carbon black clusters

Epoxy resin filled with carbon nanotubes The nanotubes are inducing electric conductivity in the resin. Flow curve: 0.1 – 100 s-1 , 1 kHz and 1V Capacity changes due to an orientation of the nanotubes

Epoxy resin filled with carbon nanotubes Strain sweep 0.1 -1000% at 10 1/s, 1kHz and 1V Capacity is constant within the linear viscoelastic range and decreases in the non- linear regime due to an alignment in flow direction.