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Thermo-mechanical performance of nanostructured electrospun composites produced...
Teixeira, Marta Albertina; Fertuzinhos, Aureliano Costa; Freitas, David Silva; Silva, C.; Ferreira, Diana P.; Felgueiras, Helena PradoThe purpose of this research was to analyze the morphology, thermal and mechanical properties of poly(vinyl alcohol) (PVA)-based electrospun mats reinforced with cellulose acetate (CA) or cellulose nanocrystalline (CNC) for potential applications in wound dressings. Bead-free and water-stable electrospun nanofibers made of blends of PVA and CA or CNC were successfully produced and crosslinked with glutaraldehyd...
Osteosynthesis metal plate system for bone fixation using bicortical screws: nu...
Olmos, Andrea Alexandra Rodrigues; Fertuzinhos, Aureliano Costa; Campos, Teresa Daniela Azevedo; Dias, R. Isabel; Viegas, A. Carlos; Pereira, F. A. M.This study reports the numerical and experimental characterization of a standard immobilization system currently being used to treat simple oblique bone fractures of femoral diaphyses. The procedure focuses on the assessment of the mechanical behavior of a bone stabilized with a dynamic compression plate (DCP) in a neutralization function, associated to a lag screw, fastened with surgical screws. The non-linear...
Antibacterial and hemostatic capacities of cellulose nanocrystalline-reinforced...
Teixeira, Marta Albertina; Antunes, Joana Isabel Costa; Seabra, Catarina Leal; Fertuzinhos, Aureliano Costa; Tohidi, Shafagh Dinparast; Reis, SaletteInfection is a major issue in chronic wound care. Different dressings have been developed to prevent microbial propagation, but an effective, all-in-one (cytocompatible, antimicrobial and promoter of healing) solution is still to be uncovered. In this research, polyvinyl alcohol (PVA) nanofibrous mats reinforced with cellulose nanocrystal (CNC), at 10 and 20% v/v ratios, were produced by electrospinning, crossl...
Osteosynthesis metal plate system for bone fixation using bicortical screws: nu...
Olmos, Andrea Alexandra Rodrigues; Fertuzinhos, Aureliano Costa; Dias, Maria Isabel Ribeiro; Pereira, Fábio André MagalhãesThis work describes the numerical modelling of an immobilization system currently used to repair long bone fractures. The referred system was employed to ensure the mechanical stabilization of an oblique bone fracture by means of a dynamic compression plate (DCP) and bicortical screws. The numerical characterization of the fixation system was performed to obtain stress and strain fields in cortical bone tissue....
Thermal, mechanical and chemical analysis of poly(vinyl alcohol) multifilament ...
Freire, Tania F.; Quinaz, Tiago Filipe Simões; Fertuzinhos, Aureliano Costa; Quyen, Nguyen Trong; Moura, Marcelo F. S. M. de; Martins, Marcos SilvaPoly(vinyl alcohol) (PVA) in multifilament and braided yarns (BY) forms presents great potential for the design of numerous applications. However, such solutions fail to accomplish their requirements if the chemical and thermomechanical behaviour is not sufficiently known. Hence, a comprehensive characterisation of PVA multifilament and three BY architectures (6, 8, and 10 yarns) was performed involving the app...
Thermo‐mechanical behaviour of human nasal cartilage
Fertuzinhos, Aureliano Costa; Teixeira, Marta Albertina; Ferreira, Miguel Gonçalves; Fernandes, Rui; Correia, Rossana; Malheiro, Ana Rita; Flores, PauloThe aim of this study was to undergo a comprehensive analysis of the thermo‐mechanical properties of nasal cartilages for the future design of a composite polymeric material to be used in human nose reconstruction surgery. A thermal and dynamic mechanical analysis (DMA) in tension and compression modes within the ranges 1 to 20 Hz and 30 °C to 250 °C was performed on human nasal cartilage. Differential scanning...
On the mechanical characterization of bovine bone tissue under compressive loading
Fertuzinhos, Aureliano Costa; Teixeira, Marta Albertina; Isabel Dias; Flores, Paulo; Zille, Andrea; Dourado, N.This study reveals a pioneer characterization of bovine trabecular bone tissue under dynamic compressive loading in the range of 20-140 oC, within physiological loading frequencies (1-20 Hz). The presented results demonstrate that the viscous behaviour in compression mode up to 140 oC is regulated by the collagen viscoelastic properties, showing three frequency-independent main peaks in tanδ and loss modulus at...