Stochastic Inference of Surface-Induced Effects using Brownian Motion
arXiv:2012.05512 · doi:10.1103/PhysRevResearch.3.L032011
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.
References in corpus (15)
- Brownian yet non-Gaussian diffusion: from superstatistics to subordination of diffusing diffusivities
- "Diffusing diffusivity": A model for anomalous and "anomalous yet Brownian" diffusion
- Characterizing and tracking single colloidal particles with video holographic microscopy
- Hydrodynamic Coupling of Two Brownian Spheres to a Planar Surface
- Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion
- Influence of Noise on Force Measurements
- Brownian Dynamics of a Sphere Between Parallel Walls
- Statistics of Particle Trajectories at Short Time Intervals Reveal fN-Scale Colloidal Forces
- Learning force fields from stochastic trajectories
- Test of the diffusing-diffusivity mechanism using near-wall colloidal dynamics
- Comment on "Influence of Noise on Force Measurement" [arXiv:1004.0874]
- Subfemtonewton Force Spectroscopy at the Thermal Limit in Liquids
- Nonequilibrium dynamics induced by scattering forces for optically trapped nanoparticles in strongly inertial regimes
- The role of non-conservative scattering forces and damping on Brownian particles in optical traps
- Subfemtonewton force fields measured with ergodic Brownian ensembles