info:eu-repo/semantics/article
Rich stochastic dynamics of co-doped Er:Yb fluorescence upconversion nanoparticles in the presence of thermal, nonconservative, harmonic and optical forces
Fecha
2017-03Registro en:
Nome, Rene A.; Sorbello, Cecilia; Jobbagy, Matias; Barja, Beatriz Carmen; Sanches, Vitor; et al.; Rich stochastic dynamics of co-doped Er:Yb fluorescence upconversion nanoparticles in the presence of thermal, nonconservative, harmonic and optical forces; IOP Publishing; Methods and Applications in Fluorescence; 5; 1; 3-2017; 1-6
2050-6120
CONICET Digital
CONICET
Autor
Nome, Rene A.
Sorbello, Cecilia
Jobbagy, Matias
Barja, Beatriz Carmen
Sanches, Vitor
Cruz, Joyce S.
Aguiar, Vinicius F.
Resumen
The stochastic dynamics of individual co-doped Er:Yb upconversion nanoparticles (UCNP) were investigated from experiments and simulations. TheUCNPwere characterized by high-resolution scanning electron microscopy, dynamic light scattering, and zeta potential measurements. Single UCNPmeasurements were performed by fluorescence upconversion micro-spectroscopy and optical trapping. The mean-square displacement (MSD) from singleUCNPexhibited 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 individualUCNPrevealed 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 ofUCNPadhesion, thermal fluctuations and optical forces led to a rich stochastic behavior of these nanoparticles.