Investigation of Fumed Silica/Aqueous NaCl Superdielectric Material
MetadataShow full item record
A constant current charge/discharge protocol which showed fumed silica filled to the point of incipient wetness with aqueous NaCl solution to have dielectric constants >10 ⁸ over the full range of dielectric thicknesses of 0.38–3.9 mm and discharge times of 0.25–>100 s was studied, making this material another example of a superdielectric. The dielectric constant was impacted by both frequency and thickness. For time to discharge greater than 10 s the dielectric constant for all thicknesses needed to be fairly constant, always >10⁹, although trending higher with increasing thickness. At shorter discharge times the dielectric constant consistently decreased, with decreasing time to discharge. Hence, it is reasonable to suggest that for time to discharge >10 s the dielectric constant at all thicknesses will be greater than 10⁹. This in turn implies an energy density for a 5 micron thick dielectric layer in the order of 350 J/cm³ for discharge times greater than 10 s.
The article of record as published may be found at http://dx.doi.org/10.3390/ma9020118
Showing items related by title, author, creator and subject.
Petty, Clayton W. (Monterey, California: Naval Postgraduate School, 2017-06);This thesis is part of a continuing effort to improve upon the performance and fabrication methods of powder-based superdielectric material (PSDM) capacitors. This thesis reports the performance as a function of discharge ...
Cole, Richard Ward (Monterey, California. U.S. Naval Postgraduate School, 1969-06);This thesis describes the construction and operation of an X-band microwave system for measurement of the dielectric constant of ferroelectric materials, and also the construction of a broad band, coaxial sample holder. ...
Jenkins, Natalie-Rose L. (Monterey, California: Naval Postgraduate School, 2015-09);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 ...