## Abstract

Dielectrostriction is a rheo-dielectric phenomenon that relates the variation of dielectric properties of a material to deformation. For an initially isotropic material, two independent material parameters, called the strain-dielectric coefficients, α_{1} and α_{2}, are required to describe dielectrostriction in terms of strain. Deformation affects a material's dielectric properties in two ways: (a) by introducing anisotropy in the material, which is characterized by α_{1}, and (b) by changing the volume density of the polarizable species, which is associated with (1 3 α_{1} + α_{2}). Purely viscous fluids remain isotropic during any flow-induced deformation, and therefore the coefficient α_{1} is always zero. In this paper, the dielectrostriction effect is studied in viscoelastic materials that are formulated to possess different degrees of elasticity. A special planar capacitance sensor rosette was employed to measure the coefficients α_{1} and α_{2} for these viscoelastic materials. The relationship between the material's elasticity and the coefficient α_{1} is discussed, together with some potential applications based on this relationship in the conclusion.

Original language | English |
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Pages (from-to) | 301-311 |

Number of pages | 11 |

Journal | Journal of Rheology |

Volume | 55 |

Issue number | 2 |

DOIs | |

State | Published - 03 2011 |

Externally published | Yes |

## Keywords

- Dielectrostriction
- Elasticity
- Rheo-dielectric
- Strain-dielectric coefficient
- Viscoelastic