12 documents found, page 1 of 2
Multimodal endoscopic management of fistula after sleeve gastrectomy involving ...
Fortunato, Claudia; Ferreira, Carlos; Moura, Miguel; Almeida, Amélia; Marinho, Rui; Correia, LuísIntroduction: Laparoscopic sleeve gastrectomy (LSG) is a bariatric surgical procedure associated with a non-negligible risk of postoperative adverse events, especially fistulas, the majority of which occur at the angle of His. This adverse event requires a multidisciplinary approach involving intensive care, surgery, interventional endoscopy, and radiology. Despite the absence of an algorithmic endoscopic appro...
Processing of poly(ionic liquid)-ionic liquid membranes using femtosecond (fs) ...
Gouveia, Andreia S.L.; Oliveira, Vitor; Ferraria, Ana Maria; Rego, Ana; Ferreira, Maria João; Tomé, Liliana C.; Almeida, Amélia; Marrucho, I. M.Femtosecond (fs) laser micromachining on polymeric materials is a single-step, and contactless manufacturing technology. Knowing the potential of poly(ionic liquid)s (PILs) and their derived composite materials incorporating ionic liquids (PIL-IL) to design membranes with improved CO2 separation, we here explore for the first time the creation of microchannels on the surface of PIL-IL materials by laser ablatio...
Processing of poly(ionic liquid)-ionic liquid membranes using femtosecond (fs) ...
Gouveia, Andreia S.L.; Oliveira, Vitor; Ferraria, Ana Maria; Rego, Ana; Ferreira, Maria João; Tomé, Liliana C.; Almeida, Amélia; Marrucho, I. M.Femtosecond (fs) laser micromachining on polymeric materials is a single-step, and contactless manufacturing technology. Knowing the potential of poly(ionic liquid)s (PILs) and their derived composite materials incorporating ionic liquids (PIL-IL) to design membranes with improved CO2 separation, we here explore for the first time the creation of microchannels on the surface of PIL-IL materials by laser ablatio...
Processing of poly(ionic liquid)-ionic liquid membranes using femtosecond (fs) ...
Gouveia, Andreia S.L.; Oliveira, Vitor; Ferraria, Ana Maria; Rego, Ana; Ferreira, Maria João; Tomé, Liliana C.; Almeida, Amélia; Marrucho, I. M.Femtosecond (fs) laser micromachining on polymeric materials is a single-step, and contactless manufacturing technology. Knowing the potential of poly(ionic liquid)s (PILs) and their derived composite materials incorporating ionic liquids (PIL-IL) to design membranes with improved CO2 separation, we here explore for the first time the creation of microchannels on the surface of PIL-IL materials by laser ablatio...
Strategy to improve the mechanical properties of bioabsorbable materials based ...
Figueiredo, Lígia; Fonseca, Rita; Pinto, Luís F. V.; Ferreira, Frederico Castelo; Almeida, Amélia; Rodrigues, AlexandraBioabsorbable polymeric fixation devices have been used as an alternative to metallic implants in orthopedics, preventing the stress shielding effect and avoiding a second surgery for implant removal. However, several problems are still associated with current bioabsorbable implants, including the limited mechanical stiffness and strength, and the adverse tissue reactions generated. To minimize or even eliminat...
Strategy to improve the mechanical properties of bioabsorbable materials based ...
Figueiredo, Lígia; Fonseca, Rita; Pinto, Luís F. V.; Ferreira, Frederico Castelo; Almeida, Amélia; Rodrigues, AlexandraBioabsorbable polymeric fixation devices have been used as an alternative to metallic implants in orthopedics,preventing the stress shielding effect and avoiding a second surgery for implant removal. However,several problems are still associated with current bioabsorbable implants, including the limited mechanical stiffness and strength, and the adverse tissue reactions generated. To minimize or even eliminate ...
Influence of femtosecond laser surface nanotexturing on the friction behavior o...
Alves-Lopes, Isabel; Almeida, Amélia; Oliveira, Vítor; Vilar, RuiThe aim of the present work was to investigate the influence of laser-induced periodic surface structures (LIPSS) produced by femtosecond laser on the friction behavior of silicon sliding on polytetrafluoroethylene (PTFE) in unlubricated conditions. Tribological tests were performed on polished and textured samples in air using a ball-on-flat nanotribometer, in order to evaluate the friction coefficient of poli...
New WC-Cu composites for the divertor in fusion reactors
Dias, Marta; Pinhão, N.; Faustino, R.; Martins, Ricardo; Ramos, A. S.; Vieira, M. T.; Correia, J.B.; Camacho, E.; Fernandes, F. M. Braz; Nunes, B.ABSTRACT: The requirements for the divertor components of future fusion reactors are challenging and therefore a stimulus for the development of new materials. In this paper, WC-Cu composites are studied for use as thermal barrier between the plasma facing tungsten tiles and the copper-based heat sink of the divertor. Composite materials with 50% vol. WC were prepared by hot pressing and characterized in terms ...
Femtosecond laser surface texturing of titanium as a method to reduce the adhes...
Cunha, Alexandre; Elie, Anne-Marie; Plawinski, Laurent; Serro, Ana Paula; Rego, Ana Maria Botelho do; Almeida, Amélia; Urdaci, Maria C.The aim of the present work was to investigate the possibility of using femtosecond laser surface texturing as a method to reduce the colonization of Grade 2 Titanium alloy surfaces by Staphylococcus aureus and the subsequent formation of biofilm. The laser treatments were carried out with a Yb:KYW chirped-pulse-regenerative amplification laser system with a central wavelength of 1030 nm and a pulse duration of...
Ultrafast laser texturing of Ti-6Al-4V surfaces for biomedical applications
Cunha, Alexandre; Oliveira, Vitor; Serro, Ana Paula; Zouani, Omar El-Farouk; Almeida, Amélia; Durrieu, Marie-Christine; Vilar, RuiBy controlling processing parameters such as the average fluence, number of laser pulses and beam polarization direction, different types of multiscale surface textures were produced on Ti-6Al-4V surfaces by ultrafast laser processing. The samples were textured in ambient atmosphere using an Yb:KYW chirped-pulse-regenerative amplification laser with a wavelength of 1030 nm and pulse duration of 500 fs. The wett...