The standard porosimetry (SP) technique has a number of important advantages over conventional methods for measuring the pore radius distribution in tnicroporous materials (such as mercury porosimetry, optical and electron microscopy, capillary displacement and condensation, low-angle X-ray scattering, etc.). SP can be effectively and universally used for studies of the porous structure of different materials, especially those which are easily compressed, swelled or amalgamated or those with a broad distribution of the pore radii.['] This method is based on the fundamental phenomenon of capillary equilibrium in a stack of porous bodies in mutual contact, which is chracterized by the equality of capillary potentials governing pore flooding or drying."] Many conducting polymers have been shown, using electron microscopy, to have a fibrillar structure, with the size of fibrils being dependent on the doping level, solvent, and the nature of the counterion."] As opposed to electron microscopy, the SP technique allows pore radius distribution curves (porosimetric curves) to be measured in situ in different impregnating liquids. From these curves a number of less general but frequently used structural parameters, such as specific surface area and volume, total porosity, wetting angles, etc., can be readily calculated.The purpose of the present work was not restricted to a detailed characterization of the porous structure of polyaniline (PANI), both in the form of its emeraldine salt (ES) and emeraldine base (EB), but also aims to directly compare the parameters obtained by SP with these obtained from the electronic micrographs of this material. Powders of the emeraldiiie salt (ES) were prepared by oxidative polymerization of aniline in an HCl solution using persulfate anion as an oxidant.''] Eineraldine chloride (E-CI) was converted to EB by treating the former with ammonium hydroxide solution. Other salts were obtained by treating the powder of EB with different acids. The excess[*] Dr.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.