1 “Hybrid Materials of Polyaniline and Acidic Hexaniobate Nanoscrolls: High polaron formation and improved thermal properties” Claudio H. B. Silva, Ana M. Da Costa Ferreira, Vera R. L. Constantino and Marcia L. A. Temperini* Departamento de Química Fundamental, Instituto de Química da Universidade de São Paulo (USP), C.P. 26077- CEP 05513-970 – São Paulo, SP – Brazil. Tel.: +55 11 3091 3890; fax: + 55 11 3091 3890. E-mail address: mlatempe@iq.usp.br (Marcia L. A. Temperini). Supporting Information Preparation of dispersion of emeraldine salt polyaniline (PANI-ES) The dispersion of PANI-ES in water/N,N-dimethylacetamide (pH 2.5) was prepared following procedure from literature. 1-2 Dedoped polyaniline (PANI-EB) powder (200 mg) was slowly added to 10 mL of N,N-dimethylacetamide (DMA) under stirring. The solution was stirred for 12 hours at room temperature and the insoluble particles were removed by filtration. The concentration of PANI-EB/DMA solution was determined by UV-VIS absorption spectroscopy considering the absorption coefficient at 630 nm per mole of the constitutional tetramer unit of PANI-EB ( 630 = 2.2 x 10 4 L cm -1 mol -1 ). 3 The PANI-EB/DMA solution was diluted by addition of DMA to result in a solution of concentration 4.2 x 10 -2 mol L -1 . One milliliter of this solution (dark blue color) was added to 9 mL of HCl solution (pH 3). The resulting dispersion (dark green color) was carefully acidified to pH 2.5 by addition of dilute HCl solution, and then Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2014