Nuno J. O. Silva
University of Aveiro
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Publication
Featured researches published by Nuno J. O. Silva.
Advanced Materials | 2010
Carlos D. S. Brites; Patrícia P. Lima; Nuno J. O. Silva; Ángel Millán; V. S. Amaral; Fernando Palacio; Luís D. Carlos
Temperature is a fundamental thermodynamic variable, the measurement of which is crucial in countless scientific investigations and technological developments, accounting at present for 75%–80% of the sensor market throughout the world.[1] Traditional liquid-filled and bimetallic thermometers, thermocouples, pyrometers, and thermistors are generally not suitable for temperature measurements at scales below 10 μm. This intrinsic limitation has encouraged the development of new non-contact accurate thermometers with micrometric and nanometric precision, a challenging research topic increasingly hankered for [1–2].
New Journal of Chemistry | 2011
Carlos D. S. Brites; Patrícia P. Lima; Nuno J. O. Silva; Ángel Millán; V. S. Amaral; Fernando Palacio; Luís D. Carlos
Non-invasive accurate thermometers with high spatial resolution and operating at sub-micron scales, where the conventional methods are ineffective, are currently a very active field of research strongly stimulated in the last couple of years by the challenging demands of nanotechnology and biomedicine. This perspective offers a general overview of recent examples of accurate luminescent thermometers working at micrometric and nanometric scales, particularly those involving advanced Ln3+-based functional organic–inorganic hybrid materials.
ACS Nano | 2015
Rafael Piñol; Carlos D. S. Brites; R. Bustamante; A. Martínez; Nuno J. O. Silva; José Luis Murillo; Rafael Cases; J. Carrey; Carlos Estepa; Cecilia Sosa; Fernando Palacio; Luís D. Carlos; Ángel Millán
Whereas efficient and sensitive nanoheaters and nanothermometers are demanding tools in modern bio- and nanomedicine, joining both features in a single nanoparticle still remains a real challenge, despite the recent progress achieved, most of it within the last year. Here we demonstrate a successful realization of this challenge. The heating is magnetically induced, the temperature readout is optical, and the ratiometric thermometric probes are dual-emissive Eu(3+)/Tb(3+) lanthanide complexes. The low thermometer heat capacitance (0.021·K(-1)) and heater/thermometer resistance (1 K·W(-1)), the high temperature sensitivity (5.8%·K(-1) at 296 K) and uncertainty (0.5 K), the physiological working temperature range (295-315 K), the readout reproducibility (>99.5%), and the fast time response (0.250 s) make the heater/thermometer nanoplatform proposed here unique. Cells were incubated with the nanoparticles, and fluorescence microscopy permits the mapping of the intracellular local temperature using the pixel-by-pixel ratio of the Eu(3+)/Tb(3+) intensities. Time-resolved thermometry under an ac magnetic field evidences the failure of using macroscopic thermal parameters to describe heat diffusion at the nanoscale.
Physical Review B | 2005
Nuno J. O. Silva; V. S. Amaral; Luís D. Carlos
The analysis of magnetization of antiferromagnetic nanoparticles is not straightforward due to the presence of a linear component,
Journal of Materials Chemistry | 2013
Daniela S. Tavares; Ana L. Daniel-da-Silva; Cláudia B. Lopes; Nuno J. O. Silva; V. S. Amaral; João Rocha; Eduarda Pereira; Tito Trindade
{\ensuremath{\chi}}_{\mathit{AF}}H
Applied Physics Letters | 2007
J. S. Amaral; Nuno J. O. Silva; V. S. Amaral
superimposed on the saturation and the inexistence of a simple relation between size and magnetic moment
Nanotechnology | 2009
Ana L. Daniel-da-Silva; Sara Fateixa; António J. Guiomar; B. F. O. Costa; Nuno J. O. Silva; Tito Trindade; Brian J. Goodfellow; Ana M. Gil
\ensuremath{\mu}
Journal of Materials Chemistry C | 2014
Sérgio M. F. Vilela; Duarte Ananias; José A. Fernandes; Patrícia Silva; Ana C. Gomes; Nuno J. O. Silva; Marcelo O. Rodrigues; João P. C. Tomé; Anabela A. Valente; Paulo J. A. Ribeiro-Claro; Luís D. Carlos; João Rocha; Filipe A. Almeida Paz
. We present a method, based on scaling laws, to determine the variation of
Physical Review B | 2009
Nuno J. O. Silva; Ángel Millán; Fernando Palacio; Erik Kampert; U. Zeitler; H. Rakoto; V. S. Amaral
{\ensuremath{\chi}}_{\mathit{AF}}
Applied Physics Letters | 2009
Yuki Komorida; Masaki Mito; Hiroyuki Deguchi; Seishi Takagi; Ángel Millán; Nuno J. O. Silva; Fernando Palacio
with temperature and to find the temperature dependence of