Exploring Single-Nanoparticle Dynamics at High Temperature by Optical Tweezers


The experimental determination of the velocity of a colloidal nanoparticle (v(Np)) has recently became a hot topic. The thermal dependence of v(Np) is still left to be explored although it is a valuable source of information allowing, for instance, the discernment between ballistic and diffusive regimes. Optical tweezers (OTs) constitute a tool especially useful for the experimental determination of v m , although they have only been capable of determining it at room temperature. In this work, we demonstrate that it is possible to determine the temperature dependence of the diffusive velocity of a single colloidal nanoparticle by analyzing the temperature dependence of optical forces. The comparison between experimental results and theoretical predictions allowed us to discover the impact that the anomalous temperature dependence of water properties has on the dynamics of colloidal nanoparticles in this temperature range.


Chemistry; Science & Technology - Other Topics; Materials Science; Physics


Lu, DS; Labrador-Paez, L; Ortiz-Rivero, E; Frades, P; Antoniak, MA; Wawrzynczyk, D; Nyk, M; Brites, CDS; Carlos, LD; Sole, JAG; Haro-Gonzalez, P; Jaque, D

nossos autores


This work was supported by the Ministerio de Economia y Competitividad de Espana (MAT2016-75362-C3-1-R), by the Ministerio de Ciencia e Innovacion de Espana (PID2019-106211RB-I00 and PID2019-105195RA-I00), and by Universidad Autonoma de Madrid and Comunidad Autonoma de Madrid (SI1/PJI/2019-00052) and partially developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by Portuguese funds through the FCT/MEC and when appropriate cofinanced by FEDER under the PT2020 Partnership Agreement. L.D.C. and C.D.S.B. acknowledge Fernando Maturi (University of Aveiro) for helpful discussions. D.L. acknowledges a scholarship from the China Scholarship Council (201808350097). L.L.-P. acknowledges the support from Carl Tryggers Foundation (CTS18:229). M.A.A., D.W., and M.N. acknowledge financial support from the Polish National Science Centre (Grant 2018/30/E/ST5/00718).

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