Surface Functionalization of an Aluminum Alloy to Generate an Antibiofilm Coating Based on Poly(Methyl Methacrylate) and Silver Nanoparticles
by
Lisa Muñoz 1,*, Laura Tamayo 2
, Miguel Gulppi 1, Franco Rabagliati 1, Marcos Flores 3, Marcela Urzúa 2, Manuel Azócar 1, Jose H. Zagal 1, María V. Encinas 1, Xiaorong Zhou 4, George Thompson 4 and Maritza Páez 1,*
Lisa Muñoz 1,*, Laura Tamayo 2, Miguel Gulppi 1, Franco Rabagliati 1, Marcos Flores 3, Marcela Urzúa 2, Manuel Azócar 1, Jose H. Zagal 1, María V. Encinas 1, Xiaorong Zhou 4, George Thompson 4 and Maritza Páez 1,*
1
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. L. B. O‘Higgins 3363, Casilla 40, Correo 33, Santiago 9170022, Chile
2
Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago 7800024, Chile
3
Laboratory of Surface and Nanomaterials, Physics Department, Faculty of Physics and Mathematics Science, Universidad de Chile, Beauchef 850, Santiago 8370415, Chile
4
Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M13 9PL, UK
*
Authors to whom correspondence should be addressed.
Molecules 2018, 23(11), 2747; https://doi.org/10.3390/molecules23112747
Received: 18 September 2018 / Revised: 19 October 2018 / Accepted: 22 October 2018 / Published: 24 October 2018
(This article belongs to the Special Issue Antibacterial Materials and Coatings 2018)
An experimental protocol was studied to improve the adhesion of a polymeric poly(methyl methacrylate) coating that was modified with silver nanoparticles to an aluminum alloy, AA2024. The nanoparticles were incorporated into the polymeric matrix to add the property of inhibiting biofilm formation to the anticorrosive characteristics of the film, thus also making the coating antibiocorrosive. The protocol consists of functionalizing the surface through a pseudotransesterification treatment using a methyl methacrylate monomer that bonds covalently to the surface and leaves a terminal double bond that promotes and directs the polymerization reaction that takes place in the process that follows immediately after. This results in more compact and thicker poly(methyl methacrylate) (PMMA) coatings than those obtained without pseudotransesterification. The poly(methyl methacrylate) matrix modified with nanoparticles was obtained by incorporating both the nanoparticles and the methyl methacrylate in the reactor. The in situ polymerization involved combining the pretreated AA2024 specimens combined with the methyl methacrylate monomer and AgNps. The antibiofilm capacity of the coating was evaluated against P. aeruginosa, with an excellent response. Not only did the presence of bacteria decrease, but the formation of the exopolymer subunits was 99.99% lower than on the uncoated aluminum alloy or the alloy coated with unmodified poly(methyl methacrylate). As well and significantly, the potentiodynamic polarization measurements indicate that the PMMA-Ag coating has a good anticorrosive property in a 0.1-M NaCl medium.
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Description: Figure S1. Schematic diagram showing pseudo-transesterification of the α-alumina particulates with methyl methacrylate (MMA) (* PTSA: p-toluenesulfonic acid). Figure S2. Differential pulse voltammetry of different alumina colloid suspensions in 0.1 M NaOH. Colloid M1: 150 ppm of Al2O3 particles; Colloid M2: 150 ppm Al2O3 particles after being immersed in a solution of MMA monomer and washed with methanol; Colloid M3: 150, 450 and 950 ppm of Al2O3 particles with pseudo-transesterification treatment. Figure S3. Viability of Pesudomonas aeruginosa incubated on (a) AA2024,(b) AA2024 + PMMA and (c) AA2024 + TE + PMMA-AgNPs0.01%.
MDPI and ACS Style
Muñoz, L.; Tamayo, L.; Gulppi, M.; Rabagliati, F.; Flores, M.; Urzúa, M.; Azócar, M.; Zagal, J.H.; Encinas, M.V.; Zhou, X.; Thompson, G.; Páez, M. Surface Functionalization of an Aluminum Alloy to Generate an Antibiofilm Coating Based on Poly(Methyl Methacrylate) and Silver Nanoparticles. Molecules 2018, 23, 2747.
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