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Type: Artigo
Title: Rich stochastic dynamics of co-doped Er:Yb fluorescence upconversion nanoparticles in the presence of thermal, non-conservative, harmonic and optical forces
Author: Nome, Rene A.
Sorbello, Cecilia
Jobbagy, Matias
Barja, Beatriz C.
Sanches, Vitor
Cruz, Joyce S.
Aguiar, Vinicius F.
Abstract: 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
Subject: Microscopia
Country: Reino Unido
Editor: IOP Publishing
Rights: Aberto
Identifier DOI: 10.1088/2050-6120/aa5a81
Date Issue: 2017
Appears in Collections:IQ - Artigos e Outros Documentos

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