Characterization and Ion Transport Studies on Polypyrrole Membranes Prepared Electrochemically in Subcritical and Supercritical Fluids

Abstract

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Phase behaviour and conductivity of supporting electrolytes in supercritical difluoromethane and 1,1-difluoroethane

“…It has a high dipole moment (2.27 D) 21 and dielectric constant (e r = 7 at 363.15 K and 2.9 MPa) 25 among the HFCs, making it a potential supercritical fluid for dissolving ionic species and carrying out electrodeposition. 26 In order to compare the phase and conductivity behaviours with those in CH 2 F 2 , the two well-characterised supporting electrolytes ([N( n C 4 H 9 ) 4 ][BF 4 ] and [N( n C 4 H 9 ) 4 ][B{3,5-C 6 H 3 (CF 3 ) 2 } 4 ]) were chosen and the measurements were made at 393.15 K, i.e. 7 K and 42 K, respectively, above the T c of CHF 2 CH 3 and CH 2 F 2 .…”

“…It has a high dipole moment (2.27 D) 21 and dielectric constant (e r = 7 at 363.15 K and 2.9 MPa) 25 among the HFCs, making it a potential supercritical fluid for dissolving ionic species and carrying out electrodeposition. 26 The phase equilibrium of the binary systems with the HFC (CH 2 F 2 or CHF 2 CH 3 ) was studied by using a variable-volume view cell, the detailed description of which can be found in the literature. 27 Since most of the supporting electrolytes used in this study are hygroscopic, they were handled in a glovebox and transferred to the view-cell in an argon-purged sealed glass vial.…”

One-Step Electrodeposition of Polypyrrole-Copper Nano Particles for H2O2Detection

“…Electropolymerization is a simple method for synthesizing conducting polymers (CPs), especially due to its relatively straightforward procedure. [1][2][3][4] Electropolymerization of conducting polymers dates back to 1968 when "pyrrole black" was made on a platinum electrode by exposing an aqueous solution of sulfuric acid and pyrrole monomer to an oxidative potential. 5 Recently, electropolymerization is carried out by utilizing a three-electrode cell which includes reference, working and counter electrodes in a solution of the monomer, proper solvent and electrolyte (counter ion).…”