24 documents found, page 1 of 3
Multi-Surface Adhesion Luminescent Solar Concentrators for Supply-Less IoT
Figueiredo, Gonçalo; Correia, Sandra F H; Falcão, Bruno P; Sencadas, Vitor; Fu, Lianshe; André, Paulo S; Ferreira, Rute A SThe growing prevalence of Internet of Things (IoT) devices hinges on resolving the challenge of powering sensors and transmitters. Addressing this, supply-less IoT devices are gaining traction by integrating energy harvesters. This study introduces a temperature sensor devoid of external power sources, achieved through a novel luminescent solar concentrator (LSC) device based on a stretchable, adhesive elastome...
Wearable Devices for Respiratory Monitoring
Vicente, Bernardo A.; Sebastião, Raquel; Sencadas, VitorRespiratory diseases are currently monitored through traditional pulmonary function tests, such as spirometry. However, the restrictions of these procedures, particularly in the context of the COVID-19 pandemic, have underscored the need for alternative approaches to respiratory health assessment. Wearable devices have emerged as a promising solution, providing continuous data collection, and overcoming the lim...
Edge-functionalized graphene/polydimethylsiloxane composite films for flexible ...
Montoya, Gerardo; Wagner, Klaudia; Ryder, Gregory; Naseri, Aida Shoushtari Zadeh; Faisal, Shaikh Nayeem; Sencadas, Vitor; Panhuis, Marc in hetThe design of neural electrodes has changed in the past decade, driven mainly by the development of new materials that open the possibility of manufacturing electrodes with adaptable mechanical properties and promising electrical properties. In this paper, we report on the mechanical and electrochemical properties of a polydimethylsiloxane (PDMS) composite with edge-functionalized graphene (EFG) and demonstrate...
Breast MRI Multi-Tumor Segmentation using 3D Region Growing
Pelicano, Ana Catarina; Godinho, Daniela M.; Gonçalves, Maria C. T.; Castela, Tiago; Orvalho, Maria Lurdes; Sencadas, Vitor; Sebastião, RaquelBreast tumor is one of the most prominent indicators for diagnosis of breast cancer. Magnetic Resonance Imaging (MRI) is a relevant imaging modality tool for breast cancer screening. Moreover, an accurate 3D segmentation of breast tumors from MRI scans plays a key role in the analysis of the disease. This paper presents a pipeline to automatically segment multiple tumors in breast MRI scans, following the metho...
Design, fabrication, and characterisation of a novel piezoimpedal tactile senso...
Searle, Thomas; Sencadas, Vitor; Alici, GurselEnabling the robotic ability to sense tactile interactions is a complex and interdisciplinary challenge, as traditional pressure sensors made of hard and rigid materials struggle to replicate the soft and compliant interactions of mammalian somatosensory networks. This study investigates a novel matrixed contact sensor designed for use in soft robotics and biomedical prosthesis applications. The sensor is a cou...
Direct ink writing of ATZ composites based on inks prepared by colloidal or hyd...
Lévaro, Narciso R.M.; Alves, Manuel F.R.P.; Santos, Claudinei; Sencadas, Vitor; Olhero, SusanaThe Direct Ink Writing (DIW) technique stands out due to its fast processing, low amounts of additives demanded for the ink’s preparation and, consequently, the relatively quickly thermal post-processing cycles. On this behalf, the development of inks for DIW is usually based on colloidal or hydrogel-based processing routes, which derive from interparticle interactions or gel-particle interactions, respectively...
3D printed linear soft multi-mode actuators expanding robotic applications
Drury, Ryan; Sencadas, Vitor; Alici, GurselSoft pneumatic actuators can produce a range of motions and deliver a high force-to-mass ratio whilst offering intrinsic compliance. Presently, the majority of soft pneumatic actuators are used to create bending motions, with very few able to produce significant linear movements. Fewer can actively produce strains in multiple directions. The purpose of this study is to produce and characterize a novel 3D printe...
Multifunctional skin-compliant wearable sensors for monitoring human condition ...
Maddirala, Geetika; Searle, Thomas; Wang, Xiao; Alici, Gursel; Sencadas, VitorWearable sensors and devices capable of simulating human somatosensation are highly desirable to develop the next generation of electronic skins (e-skins), human-machine interfaces, and soft robotics. Herein, the design of flexible and skin-compliant capacitive pressure sensors for monitoring human motion and physiological signals by electrical signal conversion is reported. The introduction of air chambers int...
Thermoresponsive hybrid colloidal capsules as an inorganic additive for fire-re...
Pham, Sang T.; Tieu, Anh Kiet; Sencadas, Vitor; Joseph, Paul; Arun, Malavika; Cortie, DavidImproving the fire-resistant efficiency of silicone based polymeric coatings is important in the building industry and electrical utilities. In this study, the water-containing hybrid calcium carbonate (CaCO3)−silica (SiO2) colloidal capsule has been developed and optimized as an inorganic flame-retardant additive. This capsule exhibits excellent thermal stability up to 1000 °C with a remaining intact hollow sp...
Development of an elastomeric resin for digital light processing printing
Drury, Ryan; Sencadas, Vitor; Alici, GurselSoft pneumatic actuators are ideal for soft robotic applications due to their innate compliance and high power-weight ratios, but their design is limited by the lack of suitable stretchable materials. In this study, a new highly elastic resin for digital light projection 3D printers, designated ElastAMBER, is prepared from a di-functional polyether urethane acrylate oligomer, and a blend of two different diluen...