1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Ερευνητικές ομάδες

Τύπος:	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Antimicrobial hybrid coatings combining enhanced biocidal activity under visible light irradiation with self-renewable properties
Συγγραφέας:	[EL] Μανουράς, Θεόδωρος[EN] Manouras, Theodore [EL] Κουφάκης, Ελευθέριος[EN] Koufakis, Eleftherios [EL] Βασιλάκη, Ευαγγελία[EN] Vasilaki, Evangelia [EL] Περάκη, Ιωάννα[EN] Peraki, Ioanna [EL] Βαμβακάκη, Μαρία[EN] Vamvakaki, Maria
Ημερομηνία:	2020
Περίληψη:	Hybrid, organic-inorganic, biocidal films, exhibiting self-polishing properties, were developed as effective long-lasting antimicrobial surface coatings. The films were prepared using cationically modified chitosan, synthesized by the reaction with3-bromo-N,N,Ntrimethylpropan-1-aminium bromide, to introduce permanent biocidal quaternary ammonium salt (QAS) groups along the polymer backbone, and were cross-linked by a novel, pHdegradable acetal-based cross-linker, which enabled the pH-responsive self-polishing of the hybrid coatings. TiO2 nanoparticles, modified with reduced graphene oxide (rGO) sheets, to narrow their band gap energy value and shift their photocatalytic activity in the visible light regime, were introduced within the polymer film to enhance its antibacterial activity. The hybrid coatings exhibited an effective biocidal activity in the dark (98% killing of Gramnegative and 99.9% killing of Gram-positive bacteria), when only the cationic polymer sites interacted with the bacteria membrane, and an excellent biocidal action upon visible light irradiation (99,999% killing of Gram-negative and 99.9999% killing of Gram-positive bacteria) due to the synergistic antimicrobial effect of the QAS moieties and the rGO-modified TiO2 nanoparticles. Finally, a gradual decrease in the film thickness was found, when the coatings were immersed in mildly basic (pH 8), neutral (pH 7) and acidic (pH 6) media, reaching 10, 20 and 70 % reduction, respectively after 60 days immersion time, verifying the self-polishing behavior of the coatings and the renewal of their antimicrobial surface.
Γλώσσα:	Αγγλικά
ISSN:	1944-8244
Θεματική κατηγορία:	[EL] Επιστήμη πολυμερών[EN] Polymer Science
Λέξεις-κλειδιά:	quaternized chitosan; TiO2; reduced graphene oxide; acetal-based cross-linker; biocidal surfaces; self-renewable antimicrobial coatings
Κάτοχος πνευματικών δικαιωμάτων:	© by the authors.
Ηλεκτρονική διεύθυνση περιοδικού:	https://pubs.acs.org/journal/aamick
Τίτλος πηγής δημοσίευσης:	ACS Applied Materials & Interfaces
Τεύχος:	In Press
Σημειώσεις:	This research has been financed by the Operational Program "Human Resources Development, Education and Lifelong Learning" and is co-financed by the European Union (European Social Fund) and Greek national funds (program MIS 5006044).
Εμφανίζεται στις συλλογές:	Ερευνητικές ομάδες