PLLA–silver nanoparticles bionanocomposite membranes: Preparation, antibacterial activity, and in vitro hydrolytic degradation assessment

Abstract

Silver nanoparticles (AgNp) were synthesized in aqueous phase and transferred to chloroform using a fatty amine as phase transfer agent. Poly(l‐lactic acid) (PLLA) membranes were prepared using the “functionalized” chloroform. The amount of AgNp in the chloroform was determined by atomic absorption spectroscopy. Thermogravimetric analysis, differential scanning calorimetry, and field emission scanning electron microscopy were used to characterize the membranes. A decrease of the thermal stability of the membranes was observed upon the addition of AgNp; meanwhile, the polymer crystallinity degree increased, making the membranes more fragile and brittle. The in vitro degradation assessments of the membranes in artificial saliva suggested that the time necessary to degrade the PLLA reduced by raising the concentration of the nanostructures. Additionally, the antibacterial assays demonstrated that the addition of only 13 ppm of AgNp were enough to inhibit the formation of biofilm over the bionanocomposite membranes. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47998.

Cu@Ag core–shell nanoparticle with multiple morphologies: a simple surfactant‐free synthesis and finite element simulation

“…2 a shows the TEM image of Cu@Ag NPs, it can be found that the size of Cu@Ag NP distributed is about 100 nm in the presence of non‐regular shapes, such as spherical, rod‐liked, hexagonal, and trilateral structures. The result shows that the silver shell was coated on the copper core by a diffusion control process rather than a thermodynamic control process [24]. Fig.…”

Surface Evolution of Cu–Ag Bimetallic Systems: From Experiments to Molecular Dynamics Simulation

“…It was reported that the polar amino functional groups were capable of capturing and transporting the Ag NPs present in the liquid phase through coordination bonds between the metallic silver and the nitrogen atoms of the amino groups. 34,35 From Figure 3a−c, it can be seen that a silver nucleus with a small size gradually agglomerated and finally formed a core@shell structure of Cu@Ag with an increase in the concentration of metal sources. In the case of the sample with a concentration of 5.6 mmol, Figure 3c clearly shows that the Ag nanoparticles fully covered the surface of Cu NPs to form the Cu@Ag nanostructure.…”