Universitadel Salento

Lecce nei Marsi, Italy

Universitadel Salento

Lecce nei Marsi, Italy
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Caricato A.P.,University of Salento | Cesaria M.,University of Salento | Leo C.,University of Salento | Mazzeo M.,University of Salento | And 9 more authors.
Journal of Physics D: Applied Physics | Year: 2015

The matrix assisted pulsed laser evaporation (MAPLE) technique is emerging as an alternative route to conventional deposition methods of organic materials (solution-phase and thermal evaporation approaches). However, the high surface roughness of the films deposited by MAPLE makes this technique not compatible with applications in electronics and photonics. In this paper we report the deposition of MAPLE-films of a green light emitting polymer, commercially named ADS125GE, with remarkable low roughness values, down to about 10 nm at the thickness conventionally used in photonic devices (∼40 nm). This issue is discussed as a function of polymer concentration, target-substrate distance and substrate rotation based on AFM topography images, roughness estimation and optical (absorption and luminescent) measurements. In addition we have fabricated an organic light emitting diode with this technique using the best deposition parameters which guarantee the lowest roughness. These results open the way to MAPLE applications in organic photonics and opto-electronics. © 2015 IOP Publishing Ltd.

Argentiere S.,CNR Institute of Neuroscience | Argentiere S.,University of Salento | Blasi L.,CNR Institute of Neuroscience | Ciccarella G.,CNR Institute of Neuroscience | And 6 more authors.
Journal of Applied Polymer Science | Year: 2010

Nanometer-sized poly(acrylic acid) (PAA) hydrogels were synthesized by emulsion polymerization of methyl acrylate and subsequent acidic hydrolysis. The nanohydrogel was characterized by spectroscopic methods (FTIR and 1H-NMR) and scanning probe techniques, and their pH-dependent swelling behavior was studied by dynamic light scattering. To determine the suitability of PAA nanogels as pH-sensitive carriers for biomedical applications, uptake and release of an oligothiophene fluorophore and its albumin conjugated from PAA nanogels were investigated as a function of pH by absorption and photoluminescence measurements. It was observed that uptake and release processes of both the oligothiophene and its conjugate could be controlled by changing the pH of the external solution. © 2010 Wiley Periodicals, Inc.

Ben Amar M.,University Paris Diderot | Manyuhina O.V.,University Paris Diderot | Napoli G.,Universitadel Salento
European Physical Journal Plus | Year: 2011

The symmetry breaking of the actin network from radial to longitudinal symmetry has been identified as the major mechanism for keratocytes (fish cells) motility on solid substrate. For strong friction coefficient, the two-dimensional actin flow which includes the polymerisation at the edge and depolymerisation in the bulk can be modelled as a Darcy flow, the cell shape and dynamics being then modelled by standard complex analysis methods. We use the theory of active gels to describe the orientational order of the filaments which varies from the border to the bulk. We show analytically that the reorganisation of the cortex is enough to explain the motility of the cell and find the velocity as a function of the orientation order parameter in the bulk. © Società Italiana di Fisica / Springer-Verlag 2011.

Ricciardi A.,Universitadel Salento | Colombelli A.,CNR Institute of Neuroscience | Montagna G.,CNR Institute of Neuroscience | Manera M.G.,CNR Institute of Neuroscience | And 3 more authors.
Lecture Notes in Electrical Engineering | Year: 2015

Lubricant systems are fundamental in engines (automotive, aviation, rail etc.) and in any industrial system where surfaces of moving mechanical parts are in contact [1]. An improper lubrication due to oil degradation over a long period of time can lead to unwanted component failure and increased maintenance costs. Present study, unlike methods developed until now for detecting oil degradation (loss of mechanical, physical, chemical and optical properties) focuses on the development of a Surface Plasmon Resonance (SPR) transduction methodology able to measure lubricant degradation in real time observing the change in the refractive index. This approach answers to environmental regulation and user requirements on performance, life-time expectancy and engine efficiency. © Springer International Publishing Switzerland 2015.

Negro C.,Universitadel Salento | Notarnicola S.,Universitadel Salento | De Bellis L.,Universitadel Salento | Miceli A.,Universitadel Salento
Natural Product Research | Year: 2013

The essential oil of 46 spontaneous plants of Calamintha nepeta (L.) Savi subsp. nepeta growing wild in Sud, Italy (Salento, Apulia), were investigated by GC/MS. Fifty-seven components were identified in the oil representing over the 98% of the total oil composition. Four chemotypes were identified: piperitone oxide, piperitenone oxide, piperitone-menthone and pulegone. © 2013 Taylor & Francis.

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