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International Journal of Polymer Science
Volume 2016 (2016), Article ID 1641352, 7 pages
Research Article

Antibacterial Additive for Polystyrene Based on Silver Nanoparticles Supported on Titanium Dioxide

1Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, Zona Universitaria, 78290 San Luis Potosí, SLP, Mexico
2Innovación y Desarrollo en Materiales Avanzados, A.C., Grupo Polynnova, Carretera San Luis Potosí-Guadalajara No. 1510, Nivel 3, Despacho 13, Fraccionamiento Lomas del Tecnológico, 78211 San Luis Potosí, SLP, Mexico
3Instituto de Física, Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, 78000 San Luis Potosí, SLP, Mexico
4Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, 09340 Ciudad de México, Mexico
5Departamento de Física, Tecnológico de Monterrey, 64849 Monterrey, NL, Mexico

Received 1 July 2016; Accepted 20 October 2016

Academic Editor: Ing Kong

Copyright © 2016 Miguel A. Waldo-Mendoza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Silver nanoparticles supported on titanium dioxide nanoparticles (Ag/TiO2) were incorporated and evaluated as antibacterial additive for polystyrene materials. These particles were synthesized using a deposition-precipitation method by adding silver nitrate as metallic precursor, sodium hydroxide as reducing agent, and commercial TiO2 (P25) as support. Rectangular pieces of polystyrene (PS) containing 100, 300, 500, and 700 ppm (wt.%) of the additive were made using an extrusion-injection molding process, and they were evaluated for their antibacterial properties against Escherichia coli using the Pour Plate method. Particles were distributed on the PS surface, and PS pieces presented a good antibacterial efficiency at 100, 300, and 500 ppm and decreased for 700 ppm due to an additive agglomeration on the PS surface. These results validate the antibacterial properties of Ag/TiO2, determine a concentration limit at which the additive is well distributed on the PS surface, and assess the importance of Ag in this system.