20 documents found, page 1 of 2
Uncovering the Use of Fucoxanthin and Phycobiliproteins into Solid Matrices to ...
Dias, Lília M. S.; Kovaleski, Gabriela; Fu, Lianshe; Dias, Tânia R.; Macário, Inês P. E.; Correia, Sandra F. H.; Pereira, Joana L.; Coutinho, João A. P.In the search for a better and brighter future, the use of natural luminescent renewable materials as substitutes for synthetic ones in the energy field is of prime importance. The incorporation of natural pigments (e.g., xanthophylls and phycobiliproteins) is a fundamental step in a broad spectrum of applications that are presently marred by their limited stability. The incorporation of bio-based luminescent m...
Bio-based solar energy harvesting for onsite mobile optical temperature sensing...
Correia, Sandra F. H.; Bastos, Ana R. N.; Martins, Margarida; Macário, Inês P. E.; Veloso, Telma; Pereira, Joana L.; Coutinho, João A. P.The Internet of Things (IoT) fosters the development of smart city systems for sustainable living and increases comfort for people. One of the current challenges for sustainable buildings is the optimization of energy management. Temperature monitoring in buildings is of prime importance, as heating account for a great part of the total energy consumption. Here, a solar optical temperature sensor is presented w...
Extraction and purification of phycobiliproteins from algae and their applications
Kovaleski, Gabriela; Kholany, Mariam; Dias, Lília M. S.; Correia, Sandra F. H.; Ferreira, R. A. S.; Coutinho, J. A. P.; Ventura, S. P. M.Microalgae, macroalgae and cyanobacteria are photosynthetic microorganisms, prokaryotic or eukaryotic, living in saline or freshwater environments. These have been recognized as valuable carbon sources, able to be used for food, feed, chemicals, and biopharmaceuticals. From the range of valuable compounds produced by these cells, some of the most interesting are the pigments, including chlorophylls, carotenoids...
Functional mobile-based two-factor authentication by photonic physical unclonab...
Silvério, Tiago; Dias, Lília M. S.; Ramalho, João F. C. B.; Correia, Sandra F. H.; Fu, Lianshe; Ferreira, Rute A. S.; André, Paulo S.Given the rapid expansion of the Internet of Things and because of the concerns around counterfeited goods, secure and resilient cryptographic systems are in high demand. Due to the development of digital ecosystems, mobile applications for transactions require fast and reliable methods to generate secure cryptographic keys, such as Physical Unclonable Functions (PUFs). We demonstrate a compact and reliable pho...
Photovoltaic spectral conversion materials: the role of sol–gel processing
Correia, Sandra F. H.; Frias, A. R.; André, P. S.; Ferreira, Rute A. S.; Carlos, Luís D.Photovoltaic (PV) technologies are in constant development, but all of them present limitations. One way of increasing the spectral range of absorbed sunlight, is through the use of spectral converters able to absorb radiation which is not used by PV cells and convert it to radiation with a usable energy. They can be converting layers (down-shifting or up-converting) applied on PV cells surface or luminescent s...
Solar spectral management with electrochromic devices including PMMA films dope...
Cardoso, Marita A.; Correia, Sandra F. H.; Gonçalves, Helena M. R.; Pereira, Rui F. P.; Pereira, Sónia; Maria, Teresa M. R.; Silva, Maria M.The technological potential of poly(methyl methacrylate) (PMMA)-based composite films doped with lanthanide-doped sol–gel derived ionosilicas (IS-Ln) previously proposed for luminescent down-shifting (LDS) and luminescent solar concentrator (LSC) layers connected to photovoltaic (PV) cells is extended here to electrochromic devices (ECDs), targeting the fabrication of single energy harvesting/conversion/managem...
Protein cohabitation: Improving the photochemical stability of R-Phycoerythrin ...
Bharmoria, Pankaj; Correia, Sandra F. H.; Martins, Margarida; Hernández-Rodríguez, Miguel A.; Ventura, Sónia P. M.; Ferreira, Rute A. S.The poor photochemical stability of R-phycoerythrin (R-PE) has been a bottleneck for its broad-spectrum applications. Inspired by nature, we studied a sustainable strategy of protein cohabitation to enhance R-PE stability by embedding it in a solid matrix of gelatin. Both pure R-PE and fresh phycobiliprotein (PBP) extracts recovered from Gracilaria gracilis were studied. The incorporation of R-PE in the gelatin...
Environmentally friendly luminescent solar concentrators based on an optically ...
Carlos, Carlota P. A.; Correia, Sandra F. H.; Martins, Margarida; Savchuk, Oleksandr A.; Coutinho, João A. P.; André, Paulo S.; Nieder, Jana B.Luminescent solar concentrators (LSCs) are a solution to overcome the mismatch between solar cell absorption and the solar spectrum, facilitating the integration of photovoltaic (PV) devices into the urban environment, since they can be incorporated in building façades and windows. Challenges include the search for environmentally friendly materials with chemical and optical stabilities. The enhanced green fluo...
Spectral converters for photovoltaics – what’s ahead
Ferreira, Rute A. S.; Correia, Sandra F. H.; Monguzzi, Angelo; Liu, Xiaogang; Meinardi, FrancescoThe effective incorporation of photovoltaic (PV) elements into the urban environment, specifically in buildings, is a challenging process. Apart from the aesthetic limitations of having black and opaque PV cells when installed in building façades, they are not optimally positioned for high-efficiency electric energy generation because of shadowing effects due to neighboring trees and buildings. Emphasis is give...
High emission quantum yield Tb3+-activated organic-inorganic hybrids for UV-dow...
Correia, Sandra F. H.; Fernandes, Ricardo L.; Fu, Lianshe; Nolasco, Mariela M.; Carlos, Luís D.; Ferreira, Rute A. S.Solid-state light-emitting diodes (LEDs) are driving the lighting industry towards efficient and environmentally friendly lighting and displays. Current challenges encompass efficient and low-cost down-shifting phosphors with tuned emission colors. Green light lies on the low-loss optical transmission window in plastic optical fibers and plays a special role in the regulation of the human and plant circadian rh...