Oliani WL et al. (2022), Silver-titanium polymeric nanocomposite non eco...

ECB-ART-50566

Polym Bull (Berl) 2022 Jan 01;7912:10949-10968. doi: 10.1007/s00289-021-04036-7.

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Silver-titanium polymeric nanocomposite non ecotoxic with bactericide activity.

Oliani WL , Pusceddu FH , Parra DF .

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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 TiO2 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.

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References [+] :

Cao, Enhanced Antibacterial and Food Simulant Activities of Silver Nanoparticles/Polypropylene Nanocomposite Films. 2018, Pubmed

	Fig.1. Experimental procedure from synthesis to gammasource irradiation process of nanocomposites
	Scheme 1. Model illustrates stabilization and distribution of AgNPs@TiO2 and nanoclay-platelet in film of polyethylene nanocomposite (PENC)
	Fig. 2. Results (mean and standard deviation) of Echinometra lucunter embriolarval development for different PENC films; PE0 = control
	Fig. 3. Antimicrobial activity of PENC films. Obs.: PE0 = Control
	Fig. 4. FESEM micrographs of film surface: A PENC1 (scale = 100 nm), B PENC1 (scale = 5 µm) and C EDX Spectrum of PENC1
	Fig. 5. SEM electron images and SEM–EDX elemental signal maps for PENC1: A PENC1 on the surface, (scale = 4 µm), B SEM–EDX showed blue dots referring to titanium and green dots to the clusters of silver nanoparticles; C EDX and D Semi-quantitative analysis of Ti and Ag
	Fig. 6. SEM electron images and SEM–EDX elemental signal maps for PENC2: A PENC2 on surface, (scale = 20 µm), B SEM–EDX—mapping image of showed orange dots referring silicon, blue dots referring titanium and green dots are clusters of silver nanoparticles; C EDX, and D Semi-quantitative analysis (elemental contents) of Si, Ti, and Ag
	Fig. 7. DSC curves of second heating of the polyethylene nanocomposites films—PENCs
	Fig. 8. Raman spectrum of polyethylene nanocomposite films PENC
	Fig. 9. The stress–strain curves of PENC films