Synthesis of polypyrrole nanoparticles by oil-in-water microemulsion polymerization with narrow size distribution |
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| Authors: | Víctor M Ovando-Medina René D Peralta Eduardo Mendizábal Hugo Martínez-Gutiérrez Tania E Lara-Ceniceros Raquel Ledezma-Rodríguez |
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| Institution: | 1.Departamento de Ingeniería Química, Coordinación Académica Región Altiplano (COARA),Universidad Autónoma de San Luis Potosí,Matehuala,Mexico;2.Centro de Investigación en Química Aplicada (CIQA),Saltillo,Mexico;3.Centro Universitario de Ciencias Exactas e Ingeniería, Departamentos de Química,Universidad de Guadalajara,Guadalajara,Mexico;4.Centro de Nanociencias y micro y nanotecnologías,Instituto Politécnico Nacional,D.F. Mexico,Mexico;5.Centro de Investigación en Materiales Avanzados, S.C., Alianza Norte 202,Parque de Investigación e Innovación Tecnológica,Apodaca,Mexico |
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| Abstract: | Conductive spherical polypyrrole nanoparticles were obtained by polymerization in oil-in-water (o/w) microemulsions using
sodium dodecyl sulfate (SDS) as anionic surfactant, ethanol as co-surfactant, and potassium persulfate (KPS, 0.017 wt.%) as
oxidizing agent. The average particle diameter (Dp) of the nanoparticles was between 38 and 45 nm with narrow particle size
distributions (D
w/D
n < 1.2). Dp increases with the ethanol concentration due to the intercalation between the polar heads of SDS, promoting instability
of the nanoparticles and some coagulation. In this work, low surfactant concentration was used, and the molar ratio of the
oxidizing agent to monomer was 8.5 × 10−3, a value much lower compared with others reported in the literature. Increasing the ethanol concentration in the recipes
enhanced the conductive properties of the polymers due to the high π-conjugation length obtained. |
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