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Open AccessArticle

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

1
Department of Medicine and Surgery, Nanomedicine Center, University of Milano-Bicocca, Via Raoul Follereau 3, 20854 Vedano al Lambro (MB), Italy
2
Department of Physics, University of Milano-Bicocca, Piazza della Scienza 3, 20126 Milan, Italy
3
CNR Institute for Applied Science and Intelligent Systems, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
4
Department of Chemistry, University of Pavia, via Taramelli 12, 27100 Pavia, Italy
5
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; https://doi.org/10.3390/nano10040786
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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