Silver-titanium polymeric nanocomposite non ecotoxic with bactericide activity

Abstract

Graphical Abstract In view of the intense interest in applications of silver nanoparticles in products for the medical field and in food preservation packaging due to their antimicrobial properties, the ecotoxicology of silver nanocomposites was evaluated in films. Test with the sea urchin Echinometra lucunter , to evaluate embryonic development and contamination by the action of silver and titanium nanoparticles in polyethylene nanocomposite films presents new results. The silver nanoparticle’s stability in polymeric materials can be enhanced by adding carriers, such as titanium dioxide and montmorillonite clay (MMT) without to producing one unfriendly material. For this research, low-density polyethylene (LDPE)/linear low-density polyethylene (LLDPE) were used processed in a twin-screw extruder, followed by gamma irradiation with 25 kGy and characterized by ecotoxicology assays, field emission scanning electron microscopy (FESEM), scanning electron microscopy and energy dispersive spectroscopy (SEM–EDX), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), Raman spectroscopy (SERS) and mechanical properties. The antibacterial properties of the LDPE films were investigated against Escherichia coli and Staphylococcus aureus . The gamma irradiation had an important effect in the synthesis of silver nanoparticles resulting in bactericidal activity and the death of 100% of the tested bacteria. The evaluation of the environment was considered with the ecotoxicological investigation carried out. The results indicated that the polymeric films with silver nanoparticles and TiO 2 do not contaminate the environment and neither interfere with the larval development of Echinometra lucunter . The obtained materials can be used in various applications with antimicrobial properties.

Synthesis of Biodegradable and Antimicrobial Nanocomposite Films Reinforced for Coffee and Agri-Food Product Preservation

“…This could be explained by the homogeneous dispersion of silver nanoparticle layers in a matrix consisting of chitosan, cassava starch, and PVA. In other words, such an improvement in the mechanical strength in the nanocomposite materials is related to the adequate dispersion of Ag nanoparticles that act as reinforcing fillers like that reported by . The maximum values for stress strength and strain of the film were 24 N/mm 2 and 220%, respectively.…”

“…In other words, such an improvement in the mechanical strength in the nanocomposite materials is related to the adequate dispersion of Ag nanoparticles that act as reinforcing fillers like that reported by. 31 The maximum values for stress strength and strain of the film were 24 N/mm 2 and 220%, respectively. This is consistent with published references.…”

“…This is consistent with published references. 31,32 The tensile strength of the packaging film should be greater than 3.5 N/mm 2 , according to conventional standards. 33 This means that the nanocomposite film prepared in this research has enough mechanical strength to be used as a food packaging film, which is equivalent to the mechanical strength of conventional membranes.…”

Covalent Bonding Enhanced Polypropylene Based T-ZIF-8 Masterbatch with Superior Photocatalytic and Antibacterial Performances

“…Existing antibacterial masks use silver, graphene and traditional photocatalyst as antibacterial agents. Silver has excellent antibacterial performance, but the cost is high and easy to dissolve [ 3 – 5 ], graphene is easy to fall off and cause early pulmonary toxicity when inhaled into human body, and the narrow light responses range of traditional photocatalyst materials leads to low antibacterial rate under visible light.…”