Diálogo de los seres profundos

Microwave‐assisted synthesis of Ag/ZnO hybrid filler, preparation, and characterization of antibacterial poly(vinyl chloride) composites made from the same

“…The value of the antibacterial activity R of the composite against E. coli is very high, of about 6.6 for all (1, 3, and 5 wt%) concentrations of filler in the PVC matrix. The antibacterial activity of the composite against S. aureus is lower, but it is still high enough for 3 and 5 wt% of the filler in PVC, as the critical R value should not be less than 2.0 for materials that can be categorized as having an effective antibacterial surface .…”

“…Although many antimicrobial additives are referred to as biocides, there are actually two different effects: biocidal (killing the organism) and biostatic (preventing the reproduction). Inorganic additives combine biocidal and biostatic properties, therefore, the use of inorganic APAs compounded into the polymer matrix, the so‐called antimicrobial polymer systems (APS), can produce a good antibacterial effect for medical application . Recently, attention has been focused on various metals, metal oxides and metal salts which have proven their antibacterial performance, especially if used in the form of nanoparticles .…”

Electrospun polyurethane membrane with Ag/ZnO microparticles as an antibacterial surface on polyurethane sheets

“…With respect to the overall evaluation of R of all of the prepared surfaces, the surface with the lowest concentration of Ag/ZnO (0.04 mg/cm 2 ) reached an R of about 2.8 against S. aureus , whereas against E. coli, it was about 3.9. As the critical value of R should not be less than 2.0 for materials that can be categorized as having an effective antibacterial surface, the amount of 2.8 mg of Ag/ZnO filler was sufficient for creating an antibacterial surface. However, it is important that surfaces treated with 0.08 and 0.42 mg/cm 2 of Ag/ZnO filler achieved even higher R s; for example, that against S. aureus exceeded 4.8, and that against E. coli was higher than 6.7.…”