2026-06-26T10:33:38Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/339942023-08-26T13:40:33Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Roldán, É.
author
Martínez, I. A.
author
Dinis Vizcaíno, Luis Ignacio
author
Rica, R.A.
2023-06-19T13:33:02Z
2023-06-19T13:33:02Z
2014-06-09
0003-6951
10.1063/1.4882419
https://hdl.handle.net/20.500.14352/33994
http://dx.doi.org/10.1063/1.4882419
http://scitation.aip.org/
We report on the measurement of the average kinetic energy changes in isothermal and nonisothermal quasistatic processes in the mesoscale, realized with a Brownian particle trapped with optical tweezers. Our estimation of the kinetic energy change allows to access to the full energetic description of the Brownian particle. Kinetic energy estimates are obtained from measurements of the mean square velocity of the trapped bead sampled at frequencies several orders of magnitude smaller than the momentum relaxation frequency. The velocity is tuned applying a noisy electric field that modulates the amplitude of the fluctuations of the position and velocity of the Brownian particle, whose motion is equivalent to that of a particle in a higher temperature reservoir. Additionally, we show that the dependence of the variance of the time-averaged velocity on the sampling frequency can be used to quantify properties of the electrophoretic mobility of a charged colloid. Our method could be applied to detect temperature gradients in inhomogeneous media and to characterize the complete thermodynamics of biological motors and of artificial micro and nanoscopic heat engines.
eng
Measuring kinetic energy changes in the mesoscale with low acquisition rates
journal article
URL
https://docta.ucm.es/bitstreams/320d2e09-6071-46a0-9fae-102464f63c80/download
File
MD5
01b8f0b9829fa61738b0b6fd80e4a03b
984261
application/pdf
Art. 129.pdf