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New method for the measurement of fibres orientation on the paper faces applied...
Pereira, M.J.T.; Costa, A.P.; Trindade, A.C.; Fiadeiro, P. T.; Silvy, J.; Tosio, J.M.SerraFor a given change in the humidity of a paper the hygro-instability of the sheet depends of two main factors: the sheet structural parameters which reflects its structure: the sheet porosity, the fibres orientation distribution mainly in the sheet plane and the variations of these parameters across the paper sheet thickness. the water reactivity of the components of the paper sheet which depends mainly of t...
Staphylococcus epidermidis adhesion on modified urea/urethane elastomers
Teixeira, P.; Trindade, A. C.; Godinho, M. H.; Azeredo, Joana; Oliveira, Rosário; Fonseca, J. G.Block urea/urethane co-polymer films present elastomeric properties with the possible tuning of their surface properties within a wide range and are therefore considered relevant surfaces for possible medical applications. In particular, thin free standing films of urea/urethane elastomers with two soft segments, polypropylene oxide and more hydrophobic polybutadiene, develop multistable states with surface top...
Staphylococcus epidermis adhesion on modified urea/urethane elastomers
Teixeira, P.; Trindade, A. C.; Fonseca, J. G.; Azeredo, Joana; Oliveira, Rosário; Godinho, M. H.Block Urea/Urethane copolymer films present elastomeric properties with the possible tuning of their surface properties within a wide range, and are therefore considered relevant surfaces for microbial adhesion studies. In particular, Urea/Urethane elastomers develop multi-stable statesª with surface topography features with remarkable regularity b. Moreover, complex surface structures may be obtained by suitab...
A model for coated surface hardness
Fernandes, J. V.; Trindade, A. C.; Menezes, L. F.; Cavaleiro, A.The authors present a model that predicts the hardness of a film deposited on the surface of a substrate. The model is based on a simple mathematical relationship involving the hardness of the film and the hardness of the substrate, together with the hardness of the composite film/substrate at a given film thickness/penetration depth ratio. The parameters of the present model depend on the mechanical properties...
The coated surface hardness: a kinematic model
Fernandes, J. V.; Menezes, L. F.; Trindade, A. C.A study of the mechanical behaviour of a composite film-substrate material during the hardness test is undertaken. An analytical calculation is proposed applying the kinematic model to the case of the coated spherical cavity problem. The aim of this paper is to discuss the parameters that influence the mechanical behaviour, in order to understand the observed experimental results. The parameters studied are the...
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