Le Grazie di Ancona, Italy
Le Grazie di Ancona, Italy

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Raspolli Galletti A.M.,University of Pisa | Antonetti C.,University of Pisa | Marracci M.,University of Pisa | Piccinelli F.,Laboratorio Of Chimica Dello Stato Solido | Tellini B.,University of Pisa
Applied Surface Science | Year: 2013

For the first time, copper nanoparticles were synthesized under microwave (MW) irradiation in the absence of any stabilizing agent. A 2-step synthetic approach was adopted working in basic ethanol solution and then ascorbic acid was added as a reducing reagent in the second step. The obtained copper nanoparticles were characterized by UV-vis spectroscopy, XRPD and TEM analysis. UV-vis spectra show an absorption peak at about 580-590 nm, typical of the plasma resonance of copper nanoparticles and XRPD analysis reveals that the complete reduction to metallic copper was reached at the end of the second step. Average sizes in the range 7-15 nm were ascertained through TEM microscopy. These copper nanoparticles are suitable for antibacterial and antistatic applications. The bactericidal effect was investigated in relation to the diameter of inhibition zone in disk diffusion tests on calf crust leather sample and an interesting antibacterial activity was verified against both Gram positive and Gram negative bacteria (Staphylococcus aureus, Escherichia coli, Bacillus subtilis and Candida albicans). Moreover, this treated leather showed encouraging antistatic behavior: in particular, equivalent circuital parameters were estimated via an impedance spectroscopy technique to have a first evaluation of the charge dissipation activity by volume conduction. ©2013 Elsevier B.V. All rights reserved.

Pedroni M.,Laboratorio Of Chimica Dello Stato Solido | Piccinelli F.,Laboratorio Of Chimica Dello Stato Solido | Passuello T.,Laboratorio Of Chimica Dello Stato Solido | Giarola M.,University of Verona | And 4 more authors.
Nanoscale | Year: 2011

Colloidal Er3+/Yb3+, Tm3+/Yb3+ and Ho3+/Yb3+ doped CaF2 nanoparticles have been prepared by a one-pot hydrothermal procedure and their upconversion properties have been investigated. © 2011 The Royal Society of Chemistry.

Haro-Gonzalez P.,Laboratorio Of Chimica Dello Stato Solido | Ramsay W.T.,Heriot - Watt University | Maestro L.M.,Autonomous University of Madrid | Del Rosal B.,Autonomous University of Madrid | And 11 more authors.
Small | Year: 2013

Laser-induced thermal effects in optically trapped microspheres and single cells are investigated by quantum dot luminescence thermometry. Thermal spectroscopy has revealed a non-localized temperature distribution around the trap that extends over tens of micrometers, in agreement with previous theoretical models besides identifying water absorption as the most important heating source. The experimental results of thermal loading at a variety of wavelengths reveal that an optimum trapping wavelength exists for biological applications close to 820 nm. This is corroborated by a simultaneous analysis of the spectral dependence of cellular heating and damage in human lymphocytes during optical trapping. This quantum dot luminescence thermometry demonstrates that optical trapping with 820 nm laser radiation produces minimum intracellular heating, well below the cytotoxic level (43 °C), thus, avoiding cell damage. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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