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  • Stretchable scintillator composites for indirect X-ray detectors

    J. Oliveira   V. Correia   P. Costa   A. Francesko   G. Rocha   S. Lanceros-Mendez  

    Abstract Flexible and stretchable materials are increasingly being investigated for future technological platforms, polymer based materials being the most suitable candidates for those emerging technologies. This work reports on polymer based scintillator composites based on the thermoplastic elastomer Styrene-Ethylene/Butadiene-Styrene (SEBS) and Gd 2 O 3 :Eu 3+ scintillator nanoparticles, to form a polymer-based flexible and stretchable material for X-ray indirect detectors. Further, visible light yield under X-ray irradiation was improved by the inclusion of 2,5 dipheniloxazol (PPO) and (1,4-bis (2-(5-phenioxazolil))-benzol (POPOP) within the polymer matrix. Together with high levels of stretchability, with deformations up to 100%, the films exhibit suitable performance with low mechanical hysteresis (less than 1.5 MJ/m 3 for cycles up to 100% of strain) and reproducibly such as a scintillator material for the conversion of X-ray radiation into visible radiation. The decrease of just ∼13% of the X-ray radiation into visible light upon stretching up to 100% is attributed to a reduction of the effective filler concentration and proves the suitability of the developed materials for large area and stretchable X-ray radiation detectors. Graphical abstract Image 1 Highlights • Polymer-based scintillator materials have been developed based on Gd 2 O 3 :Eu 3+ nanoparticles. • The films exhibit high levels of stretchability with suitable performance. • The composites can be used for the fabrication of large area stretchable X-ray detectors.
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  • Silk fibroin-magnetic hybrid composite electrospun fibers for tissue engineering applications

    R. Brito-Pereira   D.M. Correia   C. Ribeiro   A. Francesko   I. Etxebarria   L. Pérez-Álvarez   J.L. Vilas   P. Martins   S. Lanceros-Mendez  

    Abstract This manuscript reports on the fabrication of silk fibroin (SF)-based magnetic electrospun fiber composites as scaffolds for tissue engineering applications. The magnetic responsiveness of the SF composite fibers was achieved by the inclusion of cobalt ferrite (CoFe 2 O 4 ) or magnetite (Fe 3 O 4 ) nanoparticles prior to processing the fibers via electrospinning. The influence of the processing parameters, including type and amount of nanoparticles in the composite, on the mean fiber size and size distribution was studied. Whereas the average diameter of pristine SF fibers was of 294 ± 53 nm, the inclusion of 5% of CoFe 2 O 4 and Fe 3 O 4 nanoparticles led to a slight increase in the fiber diameter. Nevertheless, the fiber diameter decreased with the higher nanoparticles loading. Regarding the physico-chemical properties of the fibrous mats, it was observed that the degree of crystallinity dropped from 67% of the pristine SF mats to 37% for the SF composites. On the other hand, the onset degradation temperature of the SF electrospun was not significantly altered by inclusion of ferrite nanoparticles. It is shown that the magnetization saturation increased with the nanoparticle filler content for both compositions (CoFe 2 O 4 /SF and Fe 3 O 4 /SF). Neither the SF pristine fibers nor the SF composites were cytotoxic, indicating their suitability for tissue engineering applications. Graphical abstract Image 1 Highlights • Silk fibroin (SF) magnetic composite fiber mats were processed by electrospinning. • CoFe 2 O 4 and Fe 3 O 4 nanoparticles up to 20%wt content were used as magnetic fillers. • The SF and SF magnetic composite fiber mats are not cytotoxic. • The composite fibers show suitable properties for tissue engineering applications.
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