Extended Data Fig. 5: External Electrolyte Conductimetry (EEC) of dielectric polymer thin film.
From: 3D spatiotemporally scalable in vivo neural probes based on fluorinated elastomers
a, Schematics of the experimental design. b, Schematics of equivalent boundary value problem and results for the diffusion of ions during EEC measurement. The schematics show ionic concentration inside the ion-filled polymer thin film over time of soaking in DI water. C0 represents the initial concentration of ions in the polymer thin film, and C is the concentration of ions in the DI water. c, Fitting of the experimental results to obtain ionic diffusivity D. d, Estimation of ionic diffusivity, D, and solubility, S, obtained by EEC for dielectric polymer thin films. (e-g) Temperature dependence of ionic diffusivity, solubility, and permeability of polymer thin films characterized by EEC measurement. e, Logarithm of the ionic diffusivity, D, measured by the EEC measurement, as a function of 1000/T (K−1). f, Logarithm of the ionic solubility, S, measured by EEC measurement, as a function of 1000/T (K−1). g, Logarithm of the ionic permeability, P, defined as the product S*D as a function of 1000/T (K−1). The linear fits in (e-g) were used to obtain energy parameters in Supplementary Table 7. T is the temperature for (e-g).
