Bastos-Arrieta, J.; Muñoz, J.; Vigués, N.; Muraviev, D.; Céspedes, F.; Mas, J.; Baeza, M. New journal of chemistry Vol. 40, num. 12, p. 10344-10352 DOI: 10.1039/c6nj02468h Data de publicació: 2016-12-01 Article en revista
The intermatrix synthesis (IMS) technique has proven to be an environmentally friendly methodology for the preparation of functional metal nanoparticles (FMNPs) on different reactive matrices. The distribution of these FMNPs is an important feature to control depending on the final application of the nanocomposite: bactericide assays for water treatment, heterogeneous catalysis, electrocatalytic effects and others. IMS offers the feasibility to control the FMNP distribution, taking into account the adequacy of the ion exchange form of the reactive matrix and the chemical nature of the reducing agent used for the synthesis (the Donnan effect). Consequently, AgAu–FMNPs and Au–FMNPs containing nanocomposites have been prepared by coupling a galvanic replacement stage to IMS, with tested bactericide features attributed to the distribution of the nanoparticles on the material. In addition, Ag–FMNPs and Au–FMNPs contained on multiwalled carbon nanotubes have been synthesized and used as conducting nanofillers for the development of amperometric nanocomposite sensors based on epoxy resin. The incorporation of these FMNPs into the nanocomposite sensor has shown significant electrocatalytic effects, obtaining enhanced electrochemical and analytical parameters, such as higher signal-to-noise ratios as well as better detection limits, quantification limits and sensitivities for the oxidation of ascorbic acid in water, which was used as a model analyte.
Domènech, B.; Ziegler, K.; Vigués, N.; Olszewski, W.; Marini, C.; Mas, J.; Muñoz, M.; Muraviev, D.; Macanás, J. New journal of chemistry Vol. 40, num. 4, p. 3716-3725 DOI: 10.1039/C5NJ03202D Data de publicació: 2016-02-19 Article en revista
The development of reusable dual-purpose nanocomposite foams for catalytic and bactericidal water treatment is reported. Small non-aggregated silver nanoparticles were made using Intermatrix Synthesis inside a polyurethane foam, which was chosen as a suitable polymeric matrix due to its high chemical and mechanical stability and industrial applicability. The antibacterial activity of the obtained nanocomposites was evaluated against suspensions of Gram-negative bacteria (E. coli), showing ideal bactericidal features for being applied to water disinfection. The catalytic activity of nanocomposites was also evaluated through a model reaction carried out under flow conditions. The possibility of reusing the catalytic material was evaluated in 3 consecutive cycles and, for all of them, no significant loss of efficiency was found. Moreover, the leakage of the active species to the media was evaluated under accelerated ageing conditions (3 h in an ultrasonic bath) and a negligible amount of silver was found outside the matrix. The chemical stability of the as-prepared nanoparticles was also evaluated by XANES and any modification in the chemical structure of silver nanoparticles was detected, even after storing the samples for two years under dry conditions
Troya, C.; Vidal, A.; Brillas, E.; Rius, J.; Torrelles, X.; Aleman, C.; Casanovas Salas, Jordi; Juliá, L. New journal of chemistry Vol. 26, num. 10, p. 1308-1313 Data de publicació: 2002-10 Article en revista