INVESTIGADORES
SORBELLO Cecilia
artículos
Título:
Rich stochastic dynamics of co-doped Er:Yb fluorescence upconversion nanoparticles in the presence of thermal, non-conservative, harmonic and optical forces
Autor/es:
NOME RENE A.; SORBELLO CECILIA; JOBBÁGY MATÍAS; BARJA BEATRIZ C.; SANCHES VITOR; CRUZ JOYCE S.; AGUIAR VINICIUS F.
Revista:
Methods and Applications in Fluorescence
Editorial:
IOP Publishing
Referencias:
Lugar: Bristol; Año: 2017 vol. 5
ISSN:
2050-6120
Resumen:
The stochastic dynamics of individual co-doped Er:Yb upconversion nanoparticles (UCNP) were investigated from experiments and simulations. The UCNP were characterized by high-resolution scanning electron microscopy, dynamic light scattering, and zeta potential measurements. Single UCNP measurements were performed by fluorescence upconversion micro-spectroscopy and optical trapping. The mean-square displacement (MSD) from single UCNP exhibited a time-dependent diffusion coefficient which was compared with Brownian dynamics simulations of a viscoelastic model of harmonically bound spheres. Experimental time-dependent two-dimensional trajectories of individual UCNP revealed correlated two-dimensional nanoparticle motion. The measurements were compared with stochastic trajectories calculated in the presence of a non-conservative rotational force field. Overall, the complex interplay of UCNP adhesion, thermal fluctuations and optical forces led to a rich stochastic behavior of these nanoparticles.
