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Dive into the research topics where Nuno J. O. Silva is active.

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Featured researches published by Nuno J. O. Silva.


Advanced Materials | 2010

A luminescent molecular thermometer for long-term absolute temperature measurements at the nanoscale

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

Lanthanide-based luminescent molecular thermometers

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

Joining Time-Resolved Thermometry and Magnetic-Induced Heating in a Single Nanoparticle Unveils Intriguing Thermal Properties

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

Relevance of magnetic moment distribution and scaling law methods to study the magnetic behavior of antiferromagnetic nanoparticles : Application to ferritin

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

Efficient sorbents based on magnetite coated with siliceous hybrid shells for removal of mercury ions

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

A mean-field scaling method for first- and second-order phase transition ferromagnets and its application in magnetocaloric studies

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

Biofunctionalized magnetic hydrogel nanospheres of magnetite and κ-carrageenan

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

Multifunctional micro- and nanosized metal–organic frameworks assembled from bisphosphonates and lanthanides

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

Temperature dependence of antiferromagnetic susceptibility in ferritin

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

Surface and core magnetic anisotropy in maghemite nanoparticles determined by pressure experiments

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

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Fernando Palacio

Spanish National Research Council

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Ángel Millán

Spanish National Research Council

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V. de Zea Bermudez

University of Trás-os-Montes and Alto Douro

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