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Materials 2016, 9(2), 118;

Investigation of Fumed Silica/Aqueous NaCl Superdielectric Material

Department of Mechanical Engineering, Naval Postgraduate School, Monterey CA 93943, USA
Energy Academic Group, Naval Postgraduate School, Monterey, CA 93943, USA
Author to whom correspondence should be addressed.
Academic Editor: Douglas Ivey
Received: 8 January 2016 / Revised: 4 February 2016 / Accepted: 16 February 2016 / Published: 20 February 2016
(This article belongs to the Section Energy Materials)
Full-Text   |   PDF [3605 KB, uploaded 20 February 2016]   |  


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 >108 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. View Full-Text
Keywords: dielectric; superdielectric; capacitor dielectric; superdielectric; capacitor

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Jenkins, N.; Petty, C.; Phillips, J. Investigation of Fumed Silica/Aqueous NaCl Superdielectric Material. Materials 2016, 9, 118.

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