Browsing by Keyword "Porous materials"
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Item Definition of the procedure to determine the suitability and durability of an anti-graffiti product for application on cultural heritage porous materials(2012-01) García, Oihana; Malaga, Katarina; Tecnalia Research & InnovationAnti-graffiti protection is becoming a common practice in many urban buildings, especially in areas of social decay. When Cultural Heritage objects are affected by graffiti, the application of anti-graffiti products can result not only in an unsatisfactory result but also in an irreversible damage of an invaluable cost. The materials commonly found in these constructions are very frequently porous and present different types of decay forms. For this reason, the protection of these materials should be carefully considered. This paper proposes a criterion to decide on the suitability and durability of an anti-graffiti product prior to its application in a porous surface of a protected building. Performance classifications are defined for a series of properties including colour and gloss, and hydric and durability properties, and minimum acceptable values or reductions in these properties are recommended.Item Label-free optical biosensing using low-cost electrospun polymeric nanofibers(2020-11-26) Martínez-Pérez, Paula; Ponce-Alcántara, Salvador; Murillo, Nieves; Pérez-Márquez, Ana; Maudes, Jon; Peraile, Inés; González-López, Laura; Gil-García, Matilde; Lorenzo-Lozano, Paloma; García-Rupérez, Jaime; Tecnalia Research & Innovation; PRINTEXPolymeric nanofiber matrices are promising structures to develop biosensing devices due to their easy and affordable large-scale fabrication and their high surface-to-volume ratio. In this work, the suitability of a polyamide 6 nanofiber matrix for the development of a label-free and real-time Fabry–Pérot cavity-based optical biosensor was studied. For such aim, in-flow biofunctionalization of nanofibers with antibodies, bound through a protein A/G layer, and specific biodetection of 10 µg/mL bovine serum albumin (BSA) were carried out. Both processes were successfully monitored via reflectivity measurements in real-time without labels and their reproducibility was demonstrated when different polymeric nanofiber matrices from the same electrospinning batch were employed as transducers. These results demonstrate not only the suitability of correctly biofunctionalized polyamide 6 nanofiber matrices to be employed for real-time and label-free specific biodetection purposes, but also the potential of electrospinning technique to create affordable and easy-to-fabricate at large scale optical transducers with a reproducible performance.Item Low-cost electrospun nanofibers for label-free and real-time optical biodetection purposes(SPIE, 2021) Martínez-Pérez, Paula; Ponce-Alcántara, Salvador; Murillo, Nieves; Pérez-Márquez, Ana; Maudes, Jon; Peraile, Inés; González-López, Laura; Gil-García, Matilde; Lorenzo-Lozano, Paloma; García-Rupérez, Jaime; Fixler, Dror; Goldys, Ewa M.; Wachsmann-Hogiu, Sebastian; Tecnalia Research & Innovation; PRINTEXIn the development of label-free and real-time optical biosensors, a straightforward and low-cost fabrication of the transducer is important, because it reduces costs and the complexity of the process. One possibility for such easy fabrication is electrospinning. It is a versatile and well-developed technique that allows the manufacturing of layers of nanofibers at a low cost with a Fabry-Pérot cavity-based optical response when illuminated with visible light. In this research, the suitability of such layers for the development of label-free and real-time optical biosensors is studied. For such aim, the nanofibers were biofunctionalized in flow with antibodies against bovine serum albumin through an intermediate layer of protein A/G. Then, BSA was flowed at a concentration of 10 μg/ml as the target analyte. As a result, biofunctionalization and biodetection processes were optically monitored in real-time successfully, demonstrating the suitability of such a simple-to-fabricate transducer for the development of label-free and real-time optical biosensors. Furthermore, in comparison with other optical transducers that require complex nanofabrication techniques, electrospun nanofibers can be deposited over vast areas to create several transducers in a single batch and at a low cost.Item Optical sensors based on polymeric nanofibers layers created by electrospinning(2018) Ponce-Alcántara, S.; Martín-Sánchez, D.; Pérez-Márquez, A.; Maudes, J.; Murillo, N.; García-Rupérez, J.; PRINTEX; Tecnalia Research & InnovationPorous materials have become ideal candidates for the creation of optical sensors that are able to reach extremely high sensitivities, due to both the possibility to infiltrate the target substances on them and to their large surface-to-volume ratio. In this work, we present a new alternative for the creation of porous optical sensors based on the use of polymeric nanofibers (NFs) layers fabricated by electrospinning. Polyamide 6 (PA6) NFs layers with average diameters lower than 30 nm and high porosities have been used for the creation of Fabry-Pérot optical sensing structures, which have shown an experimental sensitivity up to 1060 nm/RIU (refractive index unit). This high sensitivity, together with the low production cost and the possibility to be manufactured over large areas, make NFs-based structures a very promising candidate for the development of low-cost and high performance optical sensors.