Search results for "materiales"
showing 10 items of 204 documents
Proyecto europeo "SPRING": investigación, participación y acción prosocial. Estrategias, instrumentos y materiales para el diagnóstico y formación de…
2016
Effects of ions-releasing restorative materials on the dentine bonding longevity of modern universal adhesives after load-cycle and prolonged artific…
2019
This study aimed at evaluating the microtensile bond strength (MTBS) and fractographic features of dentine-bonded specimens created using universal adhesives applied in etch-and-rinse (ER) or self-etching (SE) mode in combination with modern ion-releasing resin-modified glass-ionomer cement (RMGIC)-based materials after load cycling and artificial saliva aging. Two universal adhesives (FTB: Futurabond M+, VOCO, Germany
In vitro validation of biomedical polyester-based scaffolds: Poly(lactide-co-glycolide) as model-case
2018
[EN] Monitoring and understanding the in vitro behaviour of polyester based scaffolds both comprising the study of the hydrolytic degradation and the cell seeding viability is essential to ensure the desired functionality, according to a given biomedical purpose. As a model case to compare the performance of techniques to monitor the in vitro behaviour, poly(lactide-co-glycolide) (PLGA) scaffolds were chosen. The in vitro hydrolytic degradation of PLGA scaffolds was carried out in water and phosphate buffered saline (PBS). The evolution of the mass loss, the molar mass, the thermal properties and the surface morphology were monitored. The hydrolytic degradation media was correspondingly eva…
From the portal to the classroom: interactions of digital teaching materials
2019
En estas líneas se presentan los resultados de un estudio descriptivo cuyos objetivos principales son conocer los portales instituciones de dos países, analizar la oferta de materiales didácticos digitales dirigidos a la etapa de Educación Primaria y realizar una serie de recomendaciones o propuestas para modificar las prácticas docentes hacia un modelo de enseñanza mediada por tecnología. Los resultados indican la existencia de portales institucionales que se considera una de las principales fuentes de materiales didácticos digitales utilizadas por los docentes para acceder a recursos útiles en la escuela del siglo XXI. Partiendo de esta realidad se concluye la necesidad de formación del p…
Functionalized gold nanoparticles for the detection of biologically active molecules
2015
La presente tesis doctoral titulada “Nanopartículas de oro funcionalizadas para la detección de moléculas biológicamente activas” está centrada en la combinación de principios de la Química Surpamolecular y de la Ciencia de los Materiales para la preparación de nuevas nanopartículas funcionalizadas y de derivados de fluoresceina capaces de detectar pequeñas moléculas en disolución. La primera parte de la tesis, se concentra en el diseño, síntesis, caracterización y evaluación de compuestos orgánicos que son anclados a nanopartículas de oro y utilizados como sensores cromogénicos. Se han obtenido distintos sensores para detectar simulantes de agentes de guerra, óxido nítrico y dicarboxilatos…
A Study on the Influence of the Presence of Activated Carbon in TiO2 and ZnO Photo-Assisted Degradation of 2-Propanol
2010
Novel silicon microparticles to improve sunlight stability of raw polypropylene
2015
Oxidation of polyolefins by ultraviolet/visible irradiation is a significant limitation for their use in several technological applications. The use of high-tech additives such as silicon microparticles becomes a compositing strategy that can improve the performance of these materials at long-term service conditions. Silicon particles were added to non-additivated raw polypropylene (PP) prepared by hot melt extrusion and subjected to accelerated sunlight irradiation tests. The stability of thermal properties, mechanical performance and thermal decomposition behaviour of composites was evaluated by differential scanning calorimetry, dynamic mechanical thermal analysis and thermogravimetry. T…
Protein delivery based on uncoated and chitosan-coated mesoporous silicon microparticles
2011
Mesoporous silicon is a biocompatible, biodegradable material that is receiving increased attention for pharmaceutical applications due to its extensive specific surface. This feature enables to load a variety of drugs in mesoporous silicon devices by simple adsorption-based procedures. In this work, we have addressed the fabrication and characterization of two new mesoporous silicon devices prepared by electrochemistry and intended for protein delivery, namely: (i) mesoporous silicon microparticles and (ii) chitosan-coated mesoporous silicon microparticles. Both carriers were investigated for their capacity to load a therapeutic protein (insulin) and a model antigen (bovine serum albumin) …
Effect of the dissolution time into an acid hydrolytic solvent to tailor electrospun nanofibrous polycaprolactone scaffolds
2017
[EN] The hydrolysis of the polycaprolactone (PCL) as a function of the dissolution time in a formic/acetic acid mixture was considered as a method for tailoring the morphology of nanofibrous PCL scaffolds. Hence the aim of this research was to establish a correlation between the dissolution time of the polymer in the acid solvent with the physicochemical properties of the electrospun nanofibrous scaffolds and their further service life behaviour. The physico-chemical properties of the scaffolds were assessed in terms of fibre morphology molar mass and thermal behaviour. A reduction of the molar mass and the lamellar thickness as well as an increase of the crystallinity degree were observed …
Influence of substrate and temperature on the biodegradation of polyester-based materials: Polylactide and poly(3-hydroxybutyrate-co-3-hydroxyhexanoa…
2020
[EN] The extended use of polymers from renewable resources such as aliphatic polyesters or polyhydroxyalkanoates boosted the necessity to understand their behaviour in an end-of-life scenario. Although they can be degraded in reasonable shorter times than traditional polymers, understanding the degradation mechanisms under dissimilar conditions will contribute to further developments in this field. This work aimed to study the effect of temperature and substrate in the degradation of polylactide (PLA) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) in a simulated laboratory scale to ascertain their contribution, separately or in combination. For this purpose, nine parallel degradat…