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Open AccessArticle

Nanocomposite Sprayed Films with Photo-Thermal Properties for Remote Bacteria Eradication

Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Via Raoul Follereau 3, 20854 Vedano al Lambro (MB), Italy
Department of Physics, University of Milano-Bicocca, Piazza della Scienza 3, 20126 Milan, Italy
CNR Institute for Applied Science and Intelligent Systems, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
Department of Pharmacological and Biomolecular Sciences, University of Milano, via Balzaretti 9, 20133 Milan, Italy
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 786;
Received: 24 March 2020 / Revised: 10 April 2020 / Accepted: 16 April 2020 / Published: 20 April 2020
(This article belongs to the Special Issue Advanced Noble Metal Nanoparticles)
Currently there is a strong demand for novel protective materials with efficient antibacterial properties. Nanocomposite materials loaded with photo-thermally active nanoparticles can offer promising opportunities due to the local increase of temperature upon near-infrared (NIR) light exposure capable of eradicating bacteria. In this work, we fabricated antibacterial films obtained by spraying on glass slides aqueous solutions of polymers, containing highly photo-thermally active gold nanostars (GNS) or Prussian Blue (PB) nanoparticles. Under NIR light irradiation with low intensities (0.35 W/cm2) these films demonstrated a pronounced photo-thermal effect: ΔTmax up to 26.4 °C for the GNS-containing films and ΔTmax up to 45.8 °C for the PB-containing films. In the latter case, such a local temperature increase demonstrated a remarkable effect on a Gram-negative strain (P. aeruginosa) killing (84% of dead bacteria), and a promising effect on a Gram-positive strain (S. aureus) eradication (69% of dead bacteria). The fabricated films are promising prototypes for further development of lightweight surfaces with efficient antibacterial action that can be remotely activated on demand. View Full-Text
Keywords: nanoparticles; photo-thermal effect; nanocomposites; bacteria eradication nanoparticles; photo-thermal effect; nanocomposites; bacteria eradication
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MDPI and ACS Style

Borzenkov, M.; Chirico, G.; Pallavicini, P.; Sperandeo, P.; Polissi, A.; Dacarro, G.; Doveri, L.; Collini, M.; Sironi, L.; Bouzin, M.; D’Alfonso, L. Nanocomposite Sprayed Films with Photo-Thermal Properties for Remote Bacteria Eradication. Nanomaterials 2020, 10, 786.

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