Patent Number: 063036711
Section: description

DETAILED DESCRIPTION OF THE INVENTION The method will be better understood from the following examples that are preferred, but not essential. The advantages of the present invention stem from two procedures described below. Naturally, the present invention is not limited to these particular implementations, and the person skilled in the art can envisage numerous variants without thereby going beyond the method of the invention. A first implementation consists in dissolving one gram (g) of de-doped polyaniline in 60 cm.sup.3 of fuming sulfuric acid. 430 mg of nickel acetylacetonate are added and the resulting solution is maintained under stirring for 2 hours. The solution obtained in this way is then poured slowly into methanol to obtain a precipitate of magnetic self-doped polyaniline. The precipitation cake is then washed until the washing solution (or filtrate) has neutral pH. The resulting product is then dried for 72 hours at 60.degree. C. 1.2 g of dry product are thus obtained. Measurement of the elements contained gives the following results as to composition in terms of elements: 11% nitrogen, 5.1% sulfur, and 0.15% nickel. A second advantageous implementation consists in dissolving 1 gram of de-doped polyaniline in 50 cm.sup.3 of fuming sulfuric acid. 500 mg of hydrated iron sulfate are added and the resulting solution is maintained under stirring for 2 hours. The solution then obtained is poured slowly into methanol to obtain a precipitate of magnetic self-doped polyaniline. The precipitation cake is then washed until the washing solution (or filtrate) has neutral pH. The resulting product is then dried for 72 hours at 60.degree. C. This provides 1.35 g of dry product. Measurement of the elements contained therein gives the following results as to composition in terms of elements: 11% nitrogen, 5% sulfur, and 0.6% nickel.