BUSCADOR RECOLECTA

In this work we propose a novel antibacterial coating composed of SiO2 and the polymer Poly(allylamine hydrochloride) (PAH). The coating was fabricated by the technique Layer-by-Layer (LbL). This technique has already been used in previous works, and it has the advantage that it allows to control the construction of nanosized and well organized multilayer films. Here, the new nanotexturized LbL SiO2 surface acts as antibacterial agent. The fabricated coatings have been tested in bacterial cultures of genus Lactobacillus to observe their antibacterial properties. It has been demonstrated these PAH/SiO2 coating films have a very good antimicrobial behaviour against this type of bacteria., This work was supported in part by the Spanish Ministry of Education and Science-FEDER TEC2006-12170/MIC and TEC2009-09210/MICINN ResearchGrants and Government of Navarre-FEDER Research Grants

Temperature sensors based on Quantum Dots (QDs) nanofilms deposited on the inner holes of a Photonic Crystal Fiber (PCF) was created using the layer by layer electrostatic self-assembly method. The structure is based on a PCF fiber segment spliced between two Standard Multimode Fibers (MMF) of different diameters. The sensors showed a linear variation of the intensity and wavelength emission for a temperature range from -20 ºC to 70 ºC., This work was supported in part by the Spanish CICYT-FEDER Research Grant TEC2006-12170/MIC and Gobierno de Navarra Research Grants.

In this work, a novel application of the electric field
directed layer-by-layer self assembly (EFDLA) selective
deposition method for the fabrication of optical fiber pH sensors
is presented. Here, indium tin oxide (ITO) coated optical fibers
have been fabricated via a dip-coating deposition method. These
fibers are used as electrodes in the EFDLA protocol in order to
deposit selectively the sensitive layer. Neutral Red (NR)
colorimetric pH sensitive indicator and the polymers
poly(acrylic acid) (PAA) and poly(allylamine hydrochloride)
(PAH) are used in order to obtain a pH sensitive nanostructured
coating onto ITO coated optical fibers. The results obtained in
this work revealed that the LbL material adsorption on the
electrodes can be enhanced or even inhibited when applying a
specific direct current voltage between them under some other
specific fabrication parameters. Particularly, the response of
these sensors to variations of the pH in the surrounding medium
was studied when the pH of the solutions used for the
fabrication of the films was adjusted to 7.0 and the potential
applied between electrodes was set to 2.5 V. These sensors
showed fast response time and high repeatability., The authors acknowledge financial support to the Spanish Ministry of Education and Science-FEDER TEC2006-12170.