Optimal super dielectric material

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Authors
Jenkins, Natalie-Rose L.
Subjects
capacitor
supercapacitor
super dielectric material
Advisors
Phillips, Jonathan
Kwon, Young
Date of Issue
2015-09
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Monterey, CA; Naval Postgraduate School
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Abstract
The results of this study establish that powder-based super dielectric materials (SDM) are a large family of porous electrically insulating materials filled to the point of incipient wetness (paste consistency) with liquids containing dissolved ions. This work studied the dielectric behavior at low frequency of four different high surface area, porous, refractory oxides: two alumina materials, one silica, and one fumed silica, filled with aqueous solutions containing one of two salts (NaCl or NH4Cl). All were found to have dielectric constants greater than 109. This strongly supports the fundamental hypothesis of SDM: In the presence of an electric field any electrically insulating, porous material containing liquid with dissolved ionic species will form large dipoles, polarized opposite the applied field. Large dipole SDM placed between the electrodes of a parallel plate capacitor will reduce the net field to an unprecedented extent. This family of materials can form materials with dielectric values orders of magnitude greater than any material previously studied (ca. 104 BaTiO3). Moreover; this study establishes that the identity of the porous insulating media can greatly impact the dielectric constant; 109 alumina; 1011 fumed silica. One implication of these results is that SDM can potentially be optimized to create capacitors with unprecedented energy density.
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https://hdl.handle.net/10945/47280
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Approved for public release; distribution is unlimited.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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