Enı̇s Tuncer

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A review of current state of understanding of dielectric mixture properties and approaches to use numerical calculations for their modeling are presented. It is shown that interfacial polarization can yield different non-Debye dielectric responses depending on the properties of the constituents, their concentrations and geometrical arrangements. Future(More)
Influence of number of particles considered in numerical simulations on complex dielectric permittivity of binary dilute dielectric mixtures in twodimensions are reported. In the simulations, dodecagons (polygons with 12-sides) were used to mimic disk-shaped inclusions. Using such an approach we were able to consider 16 particles in a unit-square. The(More)
Piezoelectric cellular polypropylene films, so-called ferroelectrets, are assembled in a stack with two active transducer layers. The stack is characterized with respect to its linear and quadratic response in a frequency range from 1 kHz to 80 kHz. A relatively smooth frequency response in the sound-pressure level is found for the individual layers as well(More)
Charged polymer foams show ferroelectret behavior. The anisotropy of the foamed structure can be controlled by gas-diffusion expansion. By means of well-designed void-inflation processes, the resulting dipole size is varied over a broad range. This also changes the mechanical properties, and ferroelectret foams with elastic moduli between 1 and 15 MPa can(More)
Accuracy in complex dielectric permittivity calculations in binary dielectric mixtures in two-dimensions are reported by taking into account the shape of the inclusion phase. The dielectric permittivity of the mixtures were calculated using the finite element, and the permittivities were estimated by two different procedures. The results were compared with(More)
Accuracy in complex dielectric permittivity calculations in binary dielectric mixtures in twodimensions are reported by taking into account the shape of the inclusion phase. The dielectric permittivity of the mixtures were calculated using the finite element, and the permittivities were estimated by two different procedures. The results were compared with(More)
Charged dielectric films with soft and rigid elastic and non-affine properties can be used as electro-mechanical and electro-acoustic transducers when at least one unclamped surface exists. Our previous results on one- and two-dimensional systems illustrate that the use of the Maxwell stress tensor generates perfect agreement with the analytical model.(More)
Closed-cell polymer-foam electrets with internal bipolar charge exhibit strong longitudinal piezoelectricity. The size and the shape of their internal voids can be controlled by means of an inflation process that consists of a high-pressure treatment followed by a heat-setting procedure. Experimental data reveal a maximum of the piezoelectric coefficient(More)
In this paper, a review on dielectric mixtures and the importance of the numerical simulations of dielectric mixtures are presented. It stresses on the interfacial polarization observed in mixtures. It is shown that this polarization can yield different dielectric responses depending on the properties of the constituents and their concentrations. Open(More)
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