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Institute of Nanostructures, Nanomodelling and Nanofabrication
FCT | 5876
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  • Caracterização ótica de nanofios de A1N implantados com európio

    Cardoso, José Pedro de Sousa (2017)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    Os nitretos do grupo-III dopados com iões de terras raras (TR) apresentam propriedades luminescentes promissoras para aplicações na área da optoelectrónica, nomeadamente em dispositivos emissores de luz. O ião európio, no estado de carga trivalente, é conhecido pelas transições eletrónicas intra-4f 6 na região espetral do laranja/vermelho. Este surge como potencial candidato para as diversas aplicações nesta zona do espetro visível. Nesta dissertação são estudadas as proprie...

    3D ZnO/Ag Surface-Enhanced Raman Scattering on Disposable and Flexible Cardboard Platforms

    Ana Pimentel; Andreia Araújo; Beatriz J. Coelho; Daniela Nunes; Maria J. Oliveira; Manuel J. Mendes; Hugo Águas; Rodrigo Martins; Elvira Fortunato (2017)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    In the present study, zinc oxide (ZnO) nanorods (NRs) with a hexagonal structure have been synthesized via a hydrothermal method assisted by microwave radiation, using specialized cardboard materials as substrates. Cardboard-type substrates are cost-efficient and robust paper-based platforms that can be integrated into several opto-electronic applications for medical diagnostics, analysis and/or quality control devices. This class of substrates also enables highly-sensitive Raman molecular de...

    Competitive coevolutionary algorithm for robust multi-objective optimization: the worst case minimization

    Meneghini, Ivan Reinaido; Guimaraes, Frederico Gadelha; Gaspar-Cunha, A. (2016)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    Multi-Objective Optimization (MOO) problems might be subject to many modeling or manufacturing uncertainties that affect the performance of the solutions obtained by a multi-objective optimizer. The decision maker must perform an extra step of sensitivity analysis in which each solution should be verified for its robustness, but this post optimization procedure makes the optimization process expensive and inefficient. In order to avoid this situation, many researchers are developing Robust MO...

    Digital Microfluidics for Nucleic Acid Amplification

    Coelho, Beatriz; Veigas, Bruno; Fortunato, Elvira; Martins, Rodrigo; Águas, Hugo; Igreja, Rui; Baptista, Pedro V. (2017)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    Digital Microfluidics (DMF) has emerged as a disruptive methodology for the control and manipulation of low volume droplets. In DMF, each droplet acts as a single reactor, which allows for extensive multiparallelization of biological and chemical reactions at a much smaller scale. DMF devices open entirely new and promising pathways for multiplex analysis and reaction occurring in a miniaturized format, thus allowing for healthcare decentralization from major laboratories to point-of-care wit...

    Grafeno CVD para biodeteção eletroquímica : síntese, caracterização e desenvolvimento de dispositivos

    Kulyk, Bohdan (2017)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    O presente trabalho descreve o desenvolvimento de um biossensor onde o grafeno desempenha o papel do elemento transdutor. A revisão da literatura relativamente ao enquadramento do grafeno na área da biodeteção revelou a espetroscopia de impedância eletroquímica (EIS) como uma técnica de deteção viável. As amostras de grafeno foram sintetizadas em substratos de cobre, por deposição química em fase vapor, tendo sido posteriormente caracterizadas por espetroscopia de Raman, microscopia eletró...

    Development and validation of a model for the temperature distribution in the extrusion calibration stage

    Habla, Florian; Fernandes, C.; Maier, Maximilian; Densky, Lennart; Ferrás, Luís Jorge Lima; Rajkumar, Ananth; Carneiro, O. S.; Hinrichsen, Olaf; Nóbrega, J. M. (2016)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    A new model to calculate the temperature discontinuity between two phases is derived in detail and implemented in the OpenFOAM (R) computational library. The derivation of the model is based on the local instantaneous conservation equation for energy. With the conditional volume averaging technique a single equation that governs the temperature distribution, valid in both phases, is obtained. The order of convergence of the solver is determined using the Method of Manufactured Solutions (MMS)...

    High performance screen printable lithium-ion battery cathode ink based on C-LiFePO4

    Sousa, R. E.; Oliveira, J.; Gören, Attila; Miranda, D.; Silva, Maria Manuela; Hilliou, L.; Costa, Carlos Miguel Silva; Lanceros-Méndez, S. (2016)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    Lithium-ion battery cathodes have been fabricated by screen-printing through the development of CLiFePO4 inks. It is shown that shear thinning polymer solutions in N-methyl-2-pyrrolidone (NMP) with Newtonian viscosity above 0.4 Pa s are the best binders for formulating a cathode paste with satisfactory film forming properties. The paste shows an elasticity of the order of 500 Pa and, after shear yielding, shows an apparent viscosity of the order of 3 Pa s for shear rates correspon...

    Circuitos quânticos frustrados com topologia não-trivial

    Marques, Anselmo Miguel Magalhães (2018)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    Superconductivity and topology in tight-binding models are two of the most actively researched topics in contemporary condensed matter physics. In this thesis, we aim at presenting a series of original results that encompass both topics while exploring, at the same time, a correspondence that can be drawn between them, highlighting in this process some of their common features and mutual relations. In the context of superconductivity, we focus on the study of frustration ...

    Finite elements versus experimental for a CFRP structure

    Sá, R. Figueirêdo de; Ferreira, R.; Gonçalves, N.; Vieira, N.; Nunes, J. P.; Hattum, F. W. J. van (2016)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    The work presented herein is part of a project focused on the optimization of a carbon fibre reinforced epoxy matrix (CFRP) structure. The implemented process resorts to finite elements modelling in order to evaluate the performance of the analysed structure. To validate the finite elements model at the basis of the optimization process a scale model prototype of the composite structure was built and tested under similar loading conditions. The experimental results determined were then compar...

    Sensitivity of directed networks to the addition and pruning of edges and vertices

    Goltsev, A. V.; Timár, G.; Mendes, J. F. F. (2017)
    Projects: FCT | UID/CTM/50025/2013 (147333)
    We study the sensitivity of directed complex networks to the addition and pruning of edges and vertices and introduce the susceptibility, which quantifies this sensitivity. We show that topologically different parts of a directed network have different sensitivity to the addition and pruning of edges and vertices and, therefore, they are characterized by different susceptibilities. These susceptibilities diverge at the critical point of the directed percolation transition, signaling the appea...
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