Recent experiments have shown that the capacitance of subnanometer pores increases anomalously as the pore width decreases, thereby opening a new avenue for developing supercapacitors with enhanced energy density. However, this behavior is still subject to some controversy since its physical origins are not well understood. Using atomistic simulations, we show that the capacitance of slit-shape...

This paper aims to numerically assess the effects of electrolyte properties and electrode morphology on the capacitance of electric double layer capacitors (EDLCs) made of mesoporous electrodes consisting of ordered cylindrical pores in non-aqueous electrolytes. Simulations solved a three-dimensional modified Poisson-Boltzmann model. They accounted for the finite size of ions and field-dependen...

A microfluidic channel and a contactless capacitance detector were integrated on a glass chip by a semiconductor manufacturing process for separating and analyzing Rhodamine B and inorganic ion. The electrodes of the capacitance detector were formed successively by sputtering, electroless and electrodepositions. Samples containing fluorescent agent (Rhodamine B) and inorganic ions (K, Na, and L...

We have fabricated magnetic tunneling junctions by oxidizing a wedge-shaped aluminum layer to produce junctions with ideal oxidized as well as under and over oxidized junctions on a single wafer. By investigating the capacitance spectra, we are able to study the effects due to interface charge accumulation. The electron–electron interaction among accumulated interface charges leads to a voltage...

The capacitance between a single sensor strip and the backplane Csb=1.5 pF, bias resistor from the strip implant to the bias rail Rb=1.4 M, decoupling capacitance between the implant and Al readout strip Cdec=120 pF. Two sensors connected to a hybrid have an external capacitance between their backplanes and the ground Cbp=50 nF and a series resistor between this capacitance and the voltage sou...

This paper presents simple and accurate approach to compute the minimum value of capacitance required for initiating the voltage build-up in a three-phase selfexcited induction generator. Based on the steady-state equivalent circuit model different numerical methods for solving frequency are known from previous literature, which are of 6 th order polynomial. In this paper the order of the polyn...

Here we consider the problem of the computing the capacitance of a conducting body. The capacitance can be represented as an integral functional of the stationary distribution of particular “random walk on the boundary” Markov chain. The computational algorithm derived from this is used to compute the capacitance of the unit cube with relative error 4× 10−7, the most accurate estimate known.

We have developed a highly sensitive integrated capacitance bridge for quantum capacitance measurements. Our bridge, based on a GaAs HEMT amplifier, delivers attofarad (aF) resolution using a small AC excitation at or below k(B)T over a broad temperature range (4-300 K). We have achieved a resolution at room temperature of 60 aF/√Hz for a 10  mV ac excitation at 17.5 kHz, with an improved resol...

According to the transfer impedance getting from distributed parameter model,we analyse the influences of magnetic conductivity , the number of turns ,capacitance to the shield and interturn capacitance on the high frequency characteristic of Rogowski coil through theories and simulations. Simulation shows that there are a series of zeros in high frequency band, but on the whole, the high frequ...

ac Impedance spectroscopy and transient techniques in different time domains were benchmarked for their benefit to determine rated capacitances of supercapacitors quickly and reliably, for example in industrial quality control. Scaling factors are presented to estimate rated dc capacitance by extrapolating 1 Hz ac capacitance: roughly 1.5 for acetonitrile systems, and 5 for propylencarbonate. A...