Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.19: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Dynamic Ellipsometric Light Scattering: A Feasibility Study — •Reinhard Sigel — Markdorf, Germany

For colloidal particles dispersed in water, ellipsometric light scattering (ELS) has been established as a means for the characterization of the particles' interface layers [1,2]. These layers are important for the colloidal stabilization. We explore theoretically a combination of ELS with photon correlation measurements to access the fluctuation amplitude and dynamics of soft colloidal layers (e.g. in steric stabilization). They are connected to mechanical properties of the layers and are complementary to the structure information of conventional ELS. The investigation builds on preceding work on Mie scattering by soft core-shell particles [3], correlation ellipsometry [4], extraction of the coherent scattering properties in ELS for polydisperse samples [5,6], and the detection of incoherent dynamics in the ellipsometry minimum [7].

[1] A. Erbe, K.Tauer, R. Sigel, Phys. Rev. E 73, 031406 (2006)

[2] R. Sigel, Curr. Opin. Colloid Interface Sci. 14, 426-437 (2009).

[3] D. J. Ross, R. Sigel, Phys. Rev. E 85, 056710 (2012)

[4] R. Sigel, Soft Matter 13, 1132-1141 (2017)

[5] R. Sigel, A. Erbe, Appl. Opt. 47, 2161-2170 (2008)

[6] A. Erbe, K. Tauer, R. Sigel, Langmuir 25, 2703-2710 (2009).

[7] A. Erbe, R. Sigel, Phys. Chem. Chem. Phys. 15, 19143-19146 (2013)