102 documents found, page 1 of 11
Luminescent Single-Molecule Magnets as dual magneto-optical molecular thermometers
Zanella, Sofia; Aragon-Alberti, Maxime; Brites, Carlos D. S.; Salles, Fabrice; Carlos, Luís D.; Long, JérômeLuminescent thermometry allows the remote detection of the temperature and holds great potential in future technological applications in which conventional systems could not operate. Complementary approaches to measuring the temperature aiming to enhance the thermal sensitivity would however represent a decisive step forward. For the first time, we demonstrate the proof-of-concept that luminescence thermometry ...
Probing the protein folding energy landscape: dissociation of amyloid-β fibrils...
Dongdong Lin; Zhenyu Qian; Bagnani, Massimo; Hernández-Rodríguez, Miguel A.; Corredoira-Vázquez, Julio; Guanghong Wei; Carlos, Luís D.Insoluble amyloid fibrils made from proteins and peptides are difficult to be degraded in both living and artificial systems. The importance of studying their physical stability lies primarily with their association with human neurodegenerative diseases, but also owing to their potential role in multiple bio-nanomaterial applications. Here, gold nanorods (AuNRs) were utilized to investigate the plasmonic heatin...
Local temperature increments and induced cell death in intracellular magnetic h...
Yuanyu Gu; Piñol, Rafael; Moreno-Loshuertos, Raquel; Brites, Carlos D. S.; Zeler, Justyna; Martínez, Abelardo; Maurin-Pasturel, GuillaumeThe generation of temperature gradients on nanoparticles heated externally by a magnetic field is crucially important in magnetic hyperthermia therapy. But the intrinsic low heating power of magnetic nanoparticles, at the conditions allowed for human use, is a limitation that restricts the general implementation of the technique. A promising alternative is local intracellular hyperthermia, whereby cell death (b...
Luminescent Pb-free perovskites: low-cytotoxicity materials for primary thermal...
Passini, Luan N.; Maturi, Fernando E.; Pugina, Roberta S.; Hilário, Eloísa G.; Fontes, Marina; Barud, Hernane S.; Carlos, Luís D.Selecting a suitable host matrix to perform temperature sensing in biomedical applications requires low cytotoxicity, facile synthesis, and an ability to be doped with light-emitting ions. With this perspective, indium-based halide double perovskites, specifically Cs2AgIn0.9Bi0.1Cl6, Cs2Ag0.6Na0.4InCl6, and Cs2Ag0.6Na0.4In0.9Bi0.1Cl6, were chosen as host materials to develop lanthanide-based primary thermometer...
Exploring the intra-4f and the bright white light upconversion emissions of Gd2...
Ramos, Talita J. S.; Longo, Ricardo L.; Brites, Carlos D. S.; Ferreira, Rute A. S.; Malta, Oscar L.; Carlos, Luís D.Upconversion broadband white light emission driven by low-power near-infrared (NIR) lasers has been reported for many materials, but the mechanisms and effects related to this phenomenon remain unclear. Herein, we investigate the origin of laser-induced continuous white light emission in synthesized nanoparticles (Gd0.89Yb0.10Er0.01)2O3 and a mechanical mixture of commercial oxides with the same composition 89%...
Extending the palette of luminescent primary thermometers: Yb3+/Pr3+ co-doped f...
Maturi, Fernando E.; Gaddam, Anuraag; Brites, Carlos D. S.; Souza, Joacilia M. M.; Eckert, Hellmut; Ribeiro, Sidney J. L.; Carlos, Luís D.The unique tunable properties of glasses make them versatile materials for developing numerous state-of-the-art optical technologies. To design new optical glasses with tailored properties, an extensive understanding of the intricate correlation between their chemical composition and physical properties is mandatory. By harnessing this knowledge, the full potential of vitreous matrices can be unlocked, driving ...
Resonance/off-resonance excitations: implications on the thermal evolution of E...
De, Arnab; Hernández-Rodríguez, Miguel A.; Neto, Albano N. Carneiro; Dwij, Vivek; Sathe, Vasant; Carlos, Luís D.; Ranjan, RajeevGenerally, it is known that the intensity of the emission of trivalent lanthanide ions (Ln3+) increases on cooling because of the reduced decay of the excited state population via phonon-mediated nonradiative transitions. In contrast to this, some studies in the recent past have shown that the intensity of Eu3+ photoluminescence decreases dramatically on cooling. While this anomalous behaviour has been found to...
Temperature sensing based on upconversion properties of Yb3+/Ho3+/Tm3+ tri-dope...
Perrella, Rafael V.; Debasu, Mengistie L.; Rezende, Thaís K. L.; Carneiro, Jordy A.; Barbosa, Helliomar P.; Ferreira, Rute A. S.; Carlos, Luís D.Upconverter materials based on Y0.983-xYb0.012Ho0.005TmxO3, x = 0.000 – 0.012, were synthesized by conventional coprecipitation method followed by calcination process at different temperatures: 900, 1000, and 1100 °C for 4 h under air atmosphere. The materials were characterized by XRD, SEM, and PL. The effects of the dopant concentration and calcination temperature on the upconversion emission quantum yield we...
Designing all-photonic molecular analogs for electrical components: a reprogram...
Hernández-Rodríguez, Miguel A.; Zanella, Sofia; Fu, Lianshe; Neto, Albano N. Carneiro; Carlos, Luís D.; Brites, Carlos D. S.The increasing demand for computing power and downscaling is reaching the limits of the current lithographic methods, further precluding the shrinkage of the silicon chips using state-of-the-art top-down approaches. Moreover, the current chip shortage exposes the excessive world dependence on silicon, stressing the need for silicon-free computing technologies, preferably operating at the molecular level. Here, ...
Designing next-generation molecular logic circuits: photonic concatenation in u...
Zanella, Sofia; Hernández-Rodríguez, Miguel A.; Fu, Lianshe; Shi, Rui; Carlos, Luís D.; Ferreira, Rute A. S.; Brites, Carlos D. S.Computers and computing systems are getting an increasingly essential role in society, as revealed by the current emergence of Artificial Intelligence. The further increase in computer systems and digitalization of society will certainly demand innovative computing systems with higher processing speeds at low energetic and capital costs. Remarkable developments in the last five years have been reported for quan...