220 documents found, page 1 of 22
2nd. International Workshop on Additive Manufacturing and Sustainability (IWAM)...
Rocha, João; Ribeiro, J.E.; Santos, Jorge; Lima, Rui A.In recent years, the manufacturing processes have undergone a profound transformation, driven by the rapid evolution of additive manufacturing (AM) technologies. What began as a tool primarily for prototyping through stereolithography has now expanded into a versatile and innovative field capable of producing functional, end-use components across a wide range of industries. From fused deposition modeling (FDM) ...
Recent advances and perspectives of MicroNeedles for biomedical applications
Maia, Renata Faria; Machado, Pedro; Rodrigues, Raquel Oliveira; Faustino, Vera Luísa Carreira; Schütte, Helmut; Gassmann, Stefan; Lima, Rui A.Microneedles (MN) technology has emerged as a transformative tool within the biomedical field, offering innovative solutions to challenges in drug delivery, diagnostics, and therapeutic applications. This review article provides an in-depth exploration of the diverse perspectives and applications of MNs, shedding light on their pivotal role in shaping the future of biomedical research and clinical practice. It ...
Physicochemical Characterisation of Olive Mill Wastewaters Based on Extraction ...
Afonso, Inês Santos; Duarte, Cristina; Afonso, Maria João A.P.S.; Ribeiro, António E.; Amaral, Joana S.; Sousa, Patrícia C.; Lima, Rui A.Olive mill wastewaters (OMWW) generated during olive oil extraction represent a significant environmental challenge due to their high organic matter content, acidic pH, phenolic content, and toxicity. Their composition varies widely depending on the extraction method and remains difficult to treat, particularly for small-scale producers lacking access to complex infrastructure. This study evaluates the combined...
Progress in Nanofluid Technology: From Conventional to Green Nanofluids for Bio...
Cardoso, Beatriz D.; Souza, Andrews; Nobrega, Glauco; Afonso, Inês Santos; Neves, Lucas Boniatti; Faria, Carlos; Ribeiro, J.E.; Lima, Rui A.Nanofluids (NFs), consisting of nanoparticles (NPs) suspended in base fluids, have attracted growing interest due to their superior physicochemical properties and multifunctional potential. In this review, conventional and green NF technology aspects, including synthesis routes, formulation, and applications, are discussed. Conventional NFs, involving NPs synthesized using physical and chemical approaches, have...
Thermal performance evaluation of pure PDMS and PDMS composites heat exchangers
Souza, Reinaldo; Nobrega, Glauco; Afonso, Inês Santos; Pereira, José; Cardoso, Elaine; Marques, Filipe; Vilarinho, Cândida; Moita, Ana; Lima, Rui A.This study investigates the heat transfer performance of three types of heat exchangers: one made of pure polydimethylsiloxane (PDMS), another incorporating recycled graphite (PDMS + Graphite 30 mass%), and a third using commercial aluminium nanoparticles (PDMS + Aluminium 30 mass%). Thermal performance was evaluated by measuring the thermal conductivity of the materials, analysing experimental convection tests...
Mechanical and optical properties assessment of an innovative PDMS/beeswax comp...
Ariati, Ronaldo; Souza, Andrews; Souza, Maria S.; Zille, Andrea; Soares, Delfim; Lima, Rui A.; Ribeiro, J.E.Polydimethylsiloxane (PDMS) is an elastomer that has received primary attention from researchers due to its excellent physical, chemical, and thermal properties, together with biocompatibility and high flexibility properties. Another material that has been receiving attention is beeswax because it is a natural raw material, extremely ductile, and biodegradable, with peculiar hydrophobic properties. These materi...
Recent Advances of PDMS In Vitro Biomodels for Flow Visualizations and Measurem...
Souza, Andrews; Nobrega, Glauco Tapijara Vallicelli; Neves, Lucas Boniatti; Barbosa, Filipe; Ribeiro, J.E.; Ferrera, Conrado; Lima, Rui A.Polydimethylsiloxane (PDMS) has become a popular material in microfluidic and macroscale in vitro models due to its elastomeric properties and versatility. PDMS-based biomodels are widely used in blood flow studies, offering a platform for improving flow models and validating numerical simulations. This review highlights recent advances in bioflow studies conducted using both PDMS microfluidic devices and macro...
Exploring heat exchange in space: Recent advances in two-phase fluid experiment...
Nobrega, Glauco Tapijara Vallicelli; Afonso, Inês Santos; Cardoso, Beatriz D.; Souza, Reinaldo Rodrigues de; Moita, Ana S.; Ribeiro, J.E.; Lima, Rui A.Thermal regulation has assumed a central role in space expeditions ever since the inception of Sputnik-1 in 1957. Throughout the years, numerous techniques have been developed to regulate temperatures in spacecraft and space habitats. Initially, passive systems like heat shields and thermal linings were employed, while newer missions embrace active cooling using fluids like ammonia and water. With significant a...
A Review of Methods to Modify the PDMS Surface Wettability and Their Applications
Neves, Lucas Boniatti; Afonso, Inês Santos; Nobrega, Glauco Tapijara Vallicelli; Barbosa, Luiz G.; Lima, Rui A.; Ribeiro, J.E.Polydimethylsiloxane (PDMS) has attracted great attention in various fields due to its excellent properties, but its inherent hydrophobicity presents challenges in many applications that require controlled wettability. The purpose of this review is to provide a comprehensive overview of some key strategies for modifying the wettability of PDMS surfaces by providing the main traditional methods for this modifica...
Experimental and numerical analyses of the hemodynamics impact on real intracra...
Souza, Andrews; Lopes, Diogo; Souza, Sérgio; Ribeiro, J.E.; Ferrera, Conrado; Lima, Rui A.This study investigates the impact of hemodynamics on real intracranial aneurysms (IAs) using experiments and computational fluid dynamics (CFD) simulations. A particle tracking velocimetry (PTV) approach was used to study the vortical structures inside a real aneurysm and validate numerical simulations performed at a steady regime for different flow rates. Moreover, this and two additional patient-specific cas...