P. Haro-González, B. del Rosal, L. M. Maestro, E. Martín Rodríguez, R. Naccache, J. A. Capobianco, K. Dholakia, J. García Soléa and D. Jaque*

Nanoscale, 2013, DOI: 10.1039/C3NR03644H. Amendment first published 11th November 2013

1. The size dispersion of our nanoparticles is ±20% as evaluated from the Gaussian fit included in Fig. 1. Note that on page 4 we stated that polydispersity was 35% but this is a typographical error and it should appear ±20%.
2. The linear relation between trapping force and laser power is obtained after the water viscosity is corrected to the proper value accounting for temperature at the trap position. This correction is not needed for the experiments in heavy water as no heating is produced in this case. Thus the text on page 5:

“For such trapping powers, the trapping force was found to increase almost linearly with the laser power at a rate of 200 fN/W (see dashed lines in Fig. 5). The linear trend suggests the absence of dominant heating effects. When heating effects are present, a superlinear behaviour between the trapping force and laser power appears as reported previously during the optical trapping of gold nanoparticles.”

would be more accurately stated as:

“For such trapping powers, the trapping force was found to increase almost linearly with the laser power at a rate of 200 fN/W (see dashed lines in Fig. 5). This linear trend for distilled water is observed only after proper correction for the temperature dependence of water viscosity, a correction that is not needed in absence of medium absorption (as we demonstrate in Fig. 5 for the case of trapping in heavy water). When heating effects are present, a superlinear behaviour between the trapping force and laser power appears for our data taken in standard water, as reported previously for the case of optical trapping of gold nanoparticles.”

The Royal Society of Chemistry apologises for this error and any consequent inconvenience to authors and readers.

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