Critical Casimir interactions of colloids in micellar critical solutions

Autor: Timo Knippenberg, Laurent Helden, Clemens Bechinger, Félix Ginot, Li Tian, Aubin Archambault

Publikováno v: Soft matter. 17(10)

We study the temperature-dependence of critical Casimir interactions in a critical micellar solution of the nonionic surfactant C12E5 dissolved in water. Experimentally, this is achieved with total internal reflection microscopy (TIRM) which measures

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8aeb2f4ff8201e727705c62ec723d59c
https://pubmed.ncbi.nlm.nih.gov/33533371

Measurement of second-order response without perturbation

Autor: Laurent Helden, Clemens Bechinger, Urna Basu, Matthias Krüger

We study the second order response functions of a colloidal particle being subjected to an anharmonic potential. Contrary to typical response measurements which require an external perturbation, here we experimentally confirm a recently developed app

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ff338a2f7ea21a403f1afcf4e6019d6

Archimedean-like colloidal tilings on substrates with decagonal and tetradecagonal symmetry

Autor: Laurent Helden, Johannes Roth, Clemens Bechinger, Jules Mikhael, Michael Schmiedeberg, Sebastian Rausch, Holger Stark

Publikováno v: The European Physical Journal E. 32:25-34

Two-dimensional colloidal suspensions subjected to laser interference patterns with decagonal symmetry can form an Archimedean-like tiling phase where rows of squares and triangles order aperiodically along one direction (J. Mikhael et al., Nature 45

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9593c2634edd22d8d2b07ad145e25636
https://doi.org/10.1140/epje/i2010-10587-1

Depletion potentials induced by charged colloidal rods

Autor: Laurent Helden, Gijsje H. Koenderink, Clemens Bechinger, Paul Leiderer

Publikováno v: Langmuir, 20(14), 5662-5665. American Chemical Society
Helden, L, Koenderink, G H, Leiderer, P & Bechinger, C 2004, ' Depletion potentials induced by charged colloidal rods ', Langmuir, vol. 20, no. 14, pp. 5662-5665 . https://doi.org/10.1021/la049571l

We present direct depletion potential measurements for a single colloidal sphere close to a wall in suspensions of charged colloidal rods. In contrast to earlier studies of purely entropic systems (Helden et al. Phys. Rev. Lett. 2003, 90, 048301), he

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82174c3fc337605ac4eafdb93e5393c1
https://hdl.handle.net/1871/27167

Analysis of Evanescent Waves Scattering by a Single Particle in Total Internal Reflection Microscopy

Autor: Elena Eremina, Thomas Wriedt, Laurent Helden

Publikováno v: PIERS Online. 2:447-449

Since its invention in the mid of eighties (1) Total Internal Reflection Microscopy (TIRM) has proven to be an effective technique to measure weak interactions between spherical colloidal particles and surfaces with a resolution of a few femtonewton.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d674fac2a464806817923ef2f46d0494
https://doi.org/10.2529/piers050905033319