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Condensed Matter > Soft Condensed Matter
Title: Stochastic Inference of Surface-Induced Effects using Brownian Motion
(Submitted on 10 Dec 2020 (v1), last revised 29 Apr 2021 (this version, v2))
Abstract: Brownian motion in confinement and at interfaces is a canonical situation, encountered from fundamental biophysics to nanoscale engineering. Using the Lorenz-Mie framework, we optically record the thermally-induced tridimensional trajectories of individual microparticles, within salty aqueous solutions, in the vicinity of a rigid wall, and in the presence of surface charges. We construct the time-dependent position and displacement probability density functions, and study the non-Gaussian character of the latter which is a direct signature of the hindered mobility near the wall. Based on these distributions, we implement a novel, robust and self-calibrated multifitting method, allowing for the thermal-noise-limited inference of diffusion coefficients spatially-resolved at the nanoscale, equilibrium potentials, and forces at the femtoNewton resolution.
Submission history
From: Thomas Salez [view email][v1] Thu, 10 Dec 2020 08:46:00 GMT (1476kb,D)
[v2] Thu, 29 Apr 2021 08:17:51 GMT (1494kb,D)
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