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Lanthanides in Luminescent Thermometry Chapter 281 393 FIG. 24 Nanothermometer and nanoheater in a single NP. (A) The molecular ratiometric ther- mometer is formed by Eu3+ and Tb3+ complexes placed around a magnetic nuclei that are heated with an external ac magnetic field. (B) Hyperthermia experimental setup used to measure the tem- perature dynamics. (C) The temperature of the heater can be followed in on–off heating cycles by the luminescent thermometer (open circles) and with a control semiconductor-based thermal probe immersed in the nanoparticle suspension (full circles). Whereas the control thermometer measures the suspension’s temperature, the luminescent thermometer is able to measure the tem- perature of the heated NPs. (D) Temperature mapping of ex vivo HeLa cells using a multispectral image of Eu3+ and Tb3+ emissions. The pixel-by-pixel Tb3+/Eu3+ intensity ratio gives the temper- ature of the medium with spatial resolution up to 200 nm. Adapted with permission from Pin ̃ol, R., Brites, C.D.S., Bustamante, R., Martı ́nez, A., Silva, N.J.O., Murillo, J.L., Cases, R., Carrey, J., Estepa, C., Sosa, C., Palacio, F., Carlos, L.D., Milla ́n, A. 2015. Joining time-resolved thermome- try and magnetic-induced heating in a single nanoparticle unveils intriguing thermal properties. ACS Nano 9, 3134–3142. © 2015 American Chemical Society. Section 5.1. The physics of the thermometric process is radically different to that of doped complexes, as mentioned in Section 1. Thanks to the organic component, Ln3+ complexes are dispersible in hybrid matrices (Lima et al., 2006, 2009). Besides, the inorganic component provides mechanical properties that cannot be found in organic matrices, so the judicious combination of both properties in materials result usually on valuable add-on when compared with the separated counterpartsPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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