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@INPROCEEDINGS{Lang:1047456,
author = {Lang, Peter R. and Rivera Moran, Jose Alejandro},
title = {{A}nalysing the {E}ffect of {N}oise on {S}tatic and
{D}ynamic {R}esults from {T}otal {I}nternal {R}eflection
{M}icroscopy ({TIRM})},
reportid = {FZJ-2025-04319},
year = {2025},
abstract = {Total internal reflection microscopy (TIRM) has been used
for about 30 years to measure interaction potentials between
suspended spherical colloids and flat surfaces. The method
also allows measuring position resolved dynamic properties,
specifically the diffusion coefficient and the drift
velocity normal to the surface. However, in literature there
are reports on dynamic results which are at conflict with
expectations from standard hydrodynamics. In this work, we
have used experimental TIRM in conjunction with molecular
dynamics simulations to investigate the effects of inherent
error sources due to noise artifacts on TIRM results. We
find that detector shot noise and too long sampling times
may cause erroneous results in the steep parts of the
interaction potential. Further, the noise does not
significantly affect dynamic data, but we find that too long
sampling times and/or too small probe particles will cause
issues. Additionally, we observe that dynamic results are
very likely to differ from the standard hydrodynamic
predictions for stick boundary conditions. Thus, to minimize
experimental errors, sampling times and particle sizes have
to be properly chosen when designing TIRM experiments and
for the analysis of dynamic information, partial slip
conditions have to be considered.},
month = {Sep},
date = {2025-09-28},
organization = {9th International Soft Matter
Conference, Platanias (Greece), 28 Sep
2025 - 3 Oct 2025},
subtyp = {After Call},
cin = {IBI-4},
cid = {I:(DE-Juel1)IBI-4-20200312},
pnm = {5244 - Information Processing in Neuronal Networks
(POF4-524)},
pid = {G:(DE-HGF)POF4-5244},
typ = {PUB:(DE-HGF)6},
doi = {10.34734/FZJ-2025-04319},
url = {https://juser.fz-juelich.de/record/1047456},
}