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Pamplona, Spain

Olalde B.,Tecnalia | Garmendia N.,FideNa | Saez-Martinez V.,Tecnalia | Argarate N.,Tecnalia | And 3 more authors.
Materials Science and Engineering C | Year: 2013

A new family of multifunctional scaffolds, incorporating selected biopolymer coatings on basic Bioglass® derived foams has been developed. The polymer coatings were investigated as carrier of vancomycin which is a suitable drug to impart antibiotic function to the scaffolds. It has been proved that coating with PLGA (poly(lactic-co-glycolic acid)) with dispersed vancomycin-loaded microgels provides a rapid delivery of drug to give antibacterial effects at the wound site and a further sustained release to aid mid to long-term healing. Furthermore, the microgels also improved the bioactivity of the scaffolds by acting as nucleation sites for the formation of HA crystals in simulated body fluid. © 2013 Elsevier B.V.


Dominguez S.,FideNa | Bravo J.,FideNa | Garcia O.,FideNa | Ezquer M.,Renewable Energy National Center CENER | And 3 more authors.
Photonics and Nanostructures - Fundamentals and Applications | Year: 2012

This paper presents a process to easily fabricate photonic crystals (PCs) on silicon to increase the efficiency of solar cells by reducing the sunlight reflection in the front surface of the cell. The process, based on laser interference lithography (LIL) and reactive ion etching (RIE), allows creating nanostructures over large areas with different shapes and dimensions. The reflectance of the resulting surface depends on the height, pitch, width and shape of the created PC. In this work, these parameters have been optimized by computer simulation and the best PC so far found has been fabricated on silicon. We obtain a normal reflectance under 10% in the spectral region between 500 and 900 nm without any other material employed as antireflecting coating. © 2011 Elsevier B.V. All rights reserved.


Dominguez S.,FideNa | Cornago I.,FideNa | Garcia I.,FideNa | Ezquer M.,Renewable Energy National Center CENER | And 4 more authors.
Photonics and Nanostructures - Fundamentals and Applications | Year: 2013

This paper presents the optimization of 2D photonic crystals (PCs) onto Si wafers to improve the performance of c-Si PV cells. The objective is to find a structure capable of minimizing the reflectance of the Si wafer in the spectral range between 400 nm and 1000 nm. The study has been limited to PCs that can be fabricated and characterized with the tools and technology available and to dimensions in the same order as the visible light wavelength. PCs with different shapes and dimensions have been simulated and finally the optimum structure has been fabricated by a process based on laser interference lithography (LIL) and reactive ion etching (RIE). This optimized PC presents an average reflectance of 3.6% in the selected wavelength range, without any other material used as antireflective coating. This result means a drastic reduction in comparison with reflectance obtained out of the standard wet etch texturization used in current solar cell manufacturing lines. © 2012 Elsevier B.V. All rights reserved.

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