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A Sensor for Acid Concentration Based on Cellulose Paper Sheets Modified with Polyaniline Nanoparticles
Author(s) -
Souza Fernando G.,
Oliveira Geiza E.,
Anzai Thiago,
Richa Priscila,
Cosme Tainá,
Nele Márcio,
Rodrigues Cezar H. M.,
Soares Bluma G.,
Pinto José Carlos
Publication year - 2009
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200900111
Subject(s) - materials science , hydrochloric acid , cellulose , aqueous solution , nanoparticle , chemical engineering , polyamide , polyaniline , polymer , fourier transform infrared spectroscopy , nanotechnology , polymer chemistry , composite material , organic chemistry , chemistry , engineering , metallurgy , polymerization
Sheets of cellulosic paper were modified with PAni nanoparticles through a chromatographic process. When exposed to acidic conditions, strips of the modified paper sheets are subject to RGB color changes that can be detected by a scanner (and similar devices used for image analyses). As a consequence, cellulosic paper sheets modified with PAni can be used for analyses of acid concentrations in liquid and gaseous streams. Aqueous solutions of hydrochloric acid were used for modeling purposes and it was observed that color changes were most significant when the HCl content was between 0–500 ppm range. Materials were characterized by FT‐IR spectroscopy, optical microscopy, AFM, and SAXS techniques, in order to reveal the main characteristics of the produced materials.