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Effect of neutralization and cross-linking on the thermal degradation of chitos...
Correia, D. M.; Gámiz- González, M. A.; Botelho, G.; Vidaurre, A.; Gomez Ribelles, J. L.; Lanceros-Mendez, S.; Sencadas, V.Thermal degradation of as electrospun chitosan membranes and samples subsequently treated with ethanol and cross-linked with glutaraldehyde (GA) have been studied by thermogravimetry (TG) coupled with an infrared spectrometer (FTIR). The influence of the electrospinning process and cross-linking in the electrospun chitosan thermal stability was evaluated. Up to three degradation steps were observed in the TG da...
Osteoblast, fibroblast and in vivo biological response to poly(vinylidene fluorid...
Costa, R; Ribeiro, C; Lopes, AC; Martins, P; V. Sencadas, V; Soares, R; Lanceros-Mendez, SElectroactivematerials can be taken to advantage for the development of sensors and actuators as well as for novel tissue engineering strategies. Composites based on poly(vinylidenefluoride),PVDF,have been evaluated with respect to their biological response. Cell viability and proliferation were performed in vitro both with Mesenchymal Stem Cells differentiated to osteoblasts and Human Fibroblast Foreskin 1. In ...
Thermal and hydrolytic degradation of electrospun fish gelatin membranes
Correia, D.M.; Padrão, J; Rodrigues, L. R.; Dourado, F.; Lanceros-Mendez, S.; Sencadas, V.The thermal and hydrolytic degradation of electrospun gelatin membranes cross-linked with glutaraldehyde in vapor phase has been studied. In vitro degradation of gelatin membranes was evaluated in phosphate buffer saline solution at 37 ºC. After 15 days under these conditions, a weight loss of 68 % was observed, attributed to solvation and depolymerization of the main polymeric chains. Thermal degradation kinet...
Mechanical, electrical and electro-mechanical properties of thermoplastic elast...
Costa, P.; Silva, J.; Sencadas, V.; Simões, Ricardo; Viana, J.C.; Lanceros-Méndez, S.Composites of styrene–butadiene–styrene (SBS) block copolymer with multiwall carbon nanotubes were processed by solution casting to investigate the influence of filler content, the different ratios of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content and elastomer matrix ar...
Fatigue Prediction on Fibrin Poly-ε-caprolactone Macroporous Scaffolds
Panadero, J. A.; Vikingsson, L.; Gomez Ribelles, J.; Sencadas, V.; Lanceros-Mendez, S.Tissue engineering applications rely on scaffolds that during its service life, either for in-vivo or in vitro applications, are under mechanical solicitations. The variation of the mechanical condition of the scaffold is strongly relevant for cell culture and has been scarcely addressed. Fatigue life cycle of poly-ε-caprolactone, PCL, scaffolds with and without fibrin as filler of the pore structure were chara...
PHB-PEO electrospun fiber membranes containing chlorhexidine for drug delivery ...
Fernandes, J. G.; Correia, D. M.; Botelho, G.; Padrão, J.; Ribeiro, C.; Lanceros-Mendez, S.; Sencadas, V.Fiber meshes of poly(hydroxybutyrate) (PHB) and poly(hydroxybutyrate)/ poly(ethylene oxide) (PHB/PEO) with different concentrations of chlorhexidine (CHX) were prepared by electrospinning, for assessment as a polymer based drug delivery system. The electrospun fibers were characterized at morphological, molecular and mechanical levels. The bactericidal potential of PHB and PHB/PEO electrospun fibers with and wi...
Effect of filler content on morphology and physical-chemical characteristics of...
Lopes, A. C.; Ribeiro, C.; Sencadas, V.; Botelho, G.; Lanceros-Mendez, S.Poly(vinylidene fluoride) electrospun membranes have been prepared with different NaY zeolite contents up to 32%wt. Inclusion of zeolites induces an increase of average fiber size from ~200 nm in the pure polymer up to ~500 nm in the composite with 16%wt zeolite content. For higher filler contents, a wider distribution of fibers occurs leading to a broader size distributions between the previous fiber size valu...
Bioactive albumin functionalized polylactic acid membranes for improved biocomp...
Nyanhongo, G. S.; Díaz Rodríguez, R.; Nugroho Prasetyo, E.; Caparros, C.; Ribeiro, C.; Sencadas, V.; Lanceros.Mendez, S.; Herrero Acero, E.Biocompatibility is a major challenge for successful application of many biomaterials. In this study the ability to coat chemically and enzymatically activated poly(L-lactic acid) (PLA) membranes with heat denatured human serum albumin to improve biocompatibility was investigated. PLA membranes hydrolyzed with NaOH or cutinase and then treated with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, hydrochloride (E...
Effect of fiber orientation in gelled poly (vinylience fluoride) electrospun me...
Costa, C. M.; Nunes-Pereira, J.; Sencadas, V.; Silva, M. M.; Lanceros.Mendez, S.Battery separators based on electrospun membranes of poly(vinylidene fluoride) (PVDF) have been prepared in order to study the effect of fiber alignment on the performance and characteristics of the membrane. The prepared membranes show an average fiber diameter of ~272 nm and a degree of porosity of ~87 %. The gel polymer electrolytes are prepared by soaking the membranes in the electrolyte solution. The align...
Mechanical, electrical and electro-mechanical properties of thermoplastic elast...
Costa, Pedro Filipe Ribeiro da; Silva, Jaime; Sencadas, V.; Simões, Ricardo; Viana, J. C.; Lanceros-Méndez, S.Composites of styrene-butadiene-styrene (SBS) block copolymer with multiwall carbon nanotubes (MWCNT) were processed by solution casting in order to investigate the influence of filler content, the different ratio of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content ...
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