AI Article Synopsis
- A study examined a fumed silica material filled with aqueous NaCl solution that exhibited a dielectric constant greater than 10⁸ across various thicknesses (0.38-3.9 mm) and discharge times (0.25 to over 100 seconds).
- The dielectric constant varied with frequency and thickness, remaining consistently above 10⁸ for discharge times longer than 10 seconds, and slightly increasing with thickness.
- For very short discharge times, the dielectric constant decreased, but overall, when discharge times exceed 10 seconds, energy density could reach approximately 350 J/cm³ for a 5 micron thick dielectric layer.
Article Abstract
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 >10⁸, 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 10⁸. 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456494 | PMC |
| http://dx.doi.org/10.3390/ma9020118 | DOI Listing |
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