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. 2016 Jul 7;9(7):544.
doi: 10.3390/ma9070544.

Investigation of Industrial Polyurethane Foams Modified With Antimicrobial Copper Nanoparticles

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Free PMC article

Investigation of Industrial Polyurethane Foams Modified With Antimicrobial Copper Nanoparticles

Maria Chiara Sportelli et al. Materials (Basel). .
Free PMC article

Abstract

Antimicrobial copper nanoparticles (CuNPs) were electrosynthetized and applied to the controlled impregnation of industrial polyurethane foams used as padding in the textile production or as filters for air conditioning systems. CuNP-modified materials were investigated and characterized morphologically and spectroscopically, by means of Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS). The release of copper ions in solution was studied by Electro-Thermal Atomic Absorption Spectroscopy (ETAAS). Finally, the antimicrobial activity of freshly prepared, as well as aged samples-stored for two months-was demonstrated towards different target microorganisms.

Keywords: ETAAS; XPS; copper nanoparticle; nanoantimicrobials; polyurethane foam.

Conflict of interest statement

The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

Figures

Figure 1
Figure 1
(a) Transmission Electron Microscopy (TEM) micrographs of CuNPs (highlighted by arrows) synthesized by sacrificial anode electrolysis. A micrograph at higher magnification is reported as insert; (b) Size distribution histogram of as synthesized CuNPs.
Figure 2
Figure 2
Photographs of (a) type A and (b) type B pristine polyurethane (PU) foams. Optical micrographs of pristine and Cu-treated foams; (c) Low magnification—Pristine type A foam; (d) Low magnification—Pristine type B foam; (e) High magnification—Pristine type A foam; (f) High magnification—Pristine type B foam; (g) 1:1000 Cu-modified type A foam; (h) 1:1000 Cu-modified type B foam.
Figure 3
Figure 3
Typical Cu2p3/2 X-ray photoelectron (XP) high-resolution spectra of fresh (a); and aged (b) CuNP-modified polyurethane foams.
Figure 4
Figure 4
Copper release in physiologic solution from CuNP-modified polyurethane foams, as a function of the incubation time. Different columns are relevant to different CuNP concentrations in the impregnation baths, giving rise to different Cu surface abundance on the composite. Different rows are relevant to composites obtained by different polyurethane batches or to differently aged samples.

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