Space-charge electrets

Kressmann, R.; Sessler, G. M.; Gunther, P.

doi:10.1109/94.544184

Cited by 119 publications

(65 citation statements)

References 147 publications

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“…As the holes in PTFE have a significantly higher mobility than the electrons [20,21], the applied electric field preferentially removes holes, resulting in a buildup of net negative charge over long time scales. The observed charge densities and transport time scales are consistent with values in the literature [22,23].…”

supporting

confidence: 80%

Dark Matter Still at Large

Cooley

2017

Physics

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We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35 × 10 4 kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils. At a WIMP mass of 50 GeV c −2 , WIMP-nucleon spin-independent cross sections above 2.2 × 10 −46 cm 2 are excluded at the 90% confidence level. When combined with the previously reported LUX exposure, this exclusion strengthens to 1.1 × 10 −46 cm 2 at 50 GeV c −2 .

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supporting

confidence: 80%

Dark Matter Still at Large

Cooley

2017

Physics

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“…18,19 The lack of directionality of electrostatic interactions and ionic bonds governs the dynamics and the complexity in the behavior of real-charge electrets that encompass "space-charge" and "surface-charge electrets." 20,21 Conversely, the defined directionality of covalent bonds (which, indeed, are also electric in nature) provides a key advantage for arranging noncharged molecular dipolar moieties. For molecular dipoles, patterns of covalent bonding keep the displacement of the centers of positive and negative charges more or less permanently fixed.…”

Section: Ct Molecular Electrets: Practical Ideas From Structural Biologymentioning

confidence: 99%

Bioinspired molecular electrets: bottom-up approach to energy materials and applications

2015

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Abstract. The diversity of life on Earth is made possible through an immense variety of proteins that stems from less than a couple of dozen native amino acids. Is it possible to achieve similar engineering freedom and precision to design electronic materials? What if a handful of nonnative residues with a wide range of characteristics could be rationally placed in sequences to form organic macromolecules with specifically targeted properties and functionalities? Referred to as molecular electrets, dipolar oligomers and polymers composed of non-native aromatic beta-amino acids, anthranilamides (Aa) provide venues for pursuing such possibilities. The electret molecular dipoles play a crucial role in rectifying charge transfer, e.g., enhancing charge separation and suppressing undesired charge recombination, which is essential for photovoltaics, photocatalysis, and other solar-energy applications. A set of a few Aa residues can serve as building blocks for molecular electrets with widely diverse electronic properties, presenting venues for bottom-up designs. We demonstrate how three substituents and structural permutations within an Aa residue widely alter its reduction potential. Paradigms of diversity in electronic properties, originating from a few changes within a basic molecular structure, illustrate the promising potentials of biological inspiration for energy science and engineering.

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“…have been proposed for these charge decays. 15 However, such theories generally do not explain the abrupt change from fast to slow decay and very long electret lifetimes of good electret materials. …”

Section: B Study Of Isocharge and Idiocharge On Porous Polytetrafluomentioning

confidence: 99%

Magnetoelectrets prepared by using temperature gradient method

2015

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A novel Temperature Gradient method for preparation of magnetoelectret is proposed. Non uniform magnetic field and temperature gradient are expected to be the main cause for the formation of magnetoelectrets (MEs). Being bad conductors of heat, during their formation, there is a possibility for the existence of a temperature gradient along the dielectric electrode interface. In this condition, the motion of, molecules and charge carriers are dependent on Temperature Gradient in a preferred direction. To increase this temperature gradient on both sides of the sample novel method for the preparation of MEs is developed for the first time. For this method the special sample holders are designed in our laboratory. MEs are prepared in such a way that one surface is cooled and the other is heated, during the process. With the help of XRD analysis using Type-E orientation pattern and surface charge studies on magnetoelectrets, the two main causes Non uniform magnetic field and temperature gradient for the formation of magnetoelectrets (MEs), are authenticated experimentally.

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Space-charge electrets

Cited by 119 publications

References 147 publications

Dark Matter Still at Large

Dark Matter Still at Large

Bioinspired molecular electrets: bottom-up approach to energy materials and applications

Magnetoelectrets prepared by using temperature gradient method

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