title: Cellulose nanocrystals as templates for cetyltrimethylammonium bromide mediated synthesis of Ag nanoparticles and their novel use in PLA films.
abstract: In the present paper, we reported how cellulose nanocrystals (CNC) from microcrystalline cellulose have the capacity to assist in the synthesis of metallic nanoparticles chains. A cationic surfactant, cetyltrimethylammonium bromide (CTAB), was used as modifier for CNC surface. Silver nanoparticles were synthesized on CNC, and nanoparticle density and size were optimized by varying concentrations of nitrate and reducing agents, and the reduction time. The experimental conditions were optimized for the synthesis and the resulting Ag grafted CNC (Ag-g-CNC) were characterized by means of TGA, SEM, FTIR and XRD, and then introduced in PLA matrix. PLA nanocomposite containing silver grafted cellulose nanocrystals (PLA/0.5Ag-g-1CNC) was characterized by optical and thermal analyses and the obtained data were compared with results from PLA nanocomposites containing 1% wt. of CNC (PLA/1CNC), 0.5% wt. of silver nanoparticles (PLA/0.5Ag) and hybrid system containing CNC and silver in the same amount (PLA/1CNC/0.5Ag). The results demonstrated that grafting of silver nanoparticles on CNC positively affected the thermal degradation process and cold crystallization processes of PLA matrix. Finally, the antibacterial activity of the different systems was studied at various incubation times and temperatures, showing the best performance for PLA/1CNC/0.5Ag based nanocomposite.
authors.affiliation: Ege University Faculty of Science Chemistry Department, 35100 Bornova, Izmir, Turkey; University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima 4, Italy.
authors.forename: E E
authors.initials: EE
authors.lastname: Yalcinkaya
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima 4, Italy. Electronic address: debora.puglia@unipg.it.
authors.forename: D
authors.initials: D
authors.lastname: Puglia
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima 4, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Fortunati
authors.affiliation: Molecular Medicine Department (DMM), Center for Health Technologies (CHT),UdR INSTM, University of Pavia, Via Taramelli 3/B, 27100 Pavia, Italy; Scuola Universitaria Superiore IUSS, 27100 Pavia, Italy; Department of Occupational Medicine, Toxicology and Environmental Risks, Istituti Clinici Scientifici Maugeri S.p.A., IRCCS, Via S. Boezio, 28, 27100 Pavia, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Bertoglio
authors.affiliation: Department of Chemistry, Physical-Chemistry Section, University of Pavia, Viale Taramelli 16, 27100 Pavia, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Bruni
authors.affiliation: Molecular Medicine Department (DMM), Center for Health Technologies (CHT),UdR INSTM, University of Pavia, Via Taramelli 3/B, 27100 Pavia, Italy; Department of Occupational Medicine, Toxicology and Environmental Risks, Istituti Clinici Scientifici Maugeri S.p.A., IRCCS, Via S. Boezio, 28, 27100 Pavia, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Visai
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima 4, Italy.
authors.forename: J M
authors.initials: JM
authors.lastname: Kenny
keywords: Antibacterial; Cellulose nanocrystals; Chemical modification; Grafting; Nanocomposites; Poly (lactic acid); Silver nanoparticles