Article on first-principles investigations of the dielectric properties of polypropylene/metal-oxide interfaces. Nanoscale-resolved dielectric properties of polypropylene/metal-oxide (alumina, PbTiO₃) interfaces and of the corresponding surfaces are investigated via first-principles calculations.
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Article on first-principles investigations of the dielectric properties of polypropylene/metal-oxide interfaces. Nanoscale-resolved dielectric properties of polypropylene/metal-oxide (alumina, PbTiO₃) interfaces and of the corresponding surfaces are investigated via first-principles calculations.
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11 p.: ill.
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Abstract: Nanoscale-resolved dielectric properties of polypropylene/metal-oxide (alumina, PbTiO₃) interfaces and of the corresponding surfaces are investigated via first-principles calculations. In order to ascertain the locality of the atomically resolved permittivity profiles, we propose a simple procedure to directly evaluate the real-space decay length of nonlocal effects in the dielectric susceptibility. Based on this decay length, the microscopic dielectric response is derived by using a convolution of rectangular and Gaussian filters as the averaging weight function. This procedure converges quickly to the bulk values in slabs of only moderate thicknesses, while providing atomic-layer-resolved permittivity profiles even in the presence of significant relaxations and surface structure. Our results show that (i) the surface-induced and interface-induced modifications to the dielectric permittivity in polymer/metal-oxide composites are localized to only a few atomic layers; (ii) the interface effects are mainly confined to the metal-oxide side; and (iii) metal-oxide particles larger than a few nanometers should retain the average macroscopic value of their bulk dielectric permittivities.
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Yu, Liping; Ranjan, Vivek; Buongiorno Nardelli, Marco & Bernholc, Jerry.First-principles investigations of the dielectric properties of polypropylene/metal-oxide interfaces,
article,
October 30, 2009;
[College Park, Maryland].
(https://digital.library.unt.edu/ark:/67531/metadc234923/:
accessed June 9, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT College of Arts and Sciences.