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Main Authors:	Heitmeier, Linnea, Voigtmann, Thomas
Format:	Preprint
Published:	2025
Subjects:	Soft Condensed Matter
Online Access:	https://arxiv.org/abs/2503.08611
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author	Heitmeier, Linnea Voigtmann, Thomas
author_facet	Heitmeier, Linnea Voigtmann, Thomas
contents	We investigate the interface of a glass-forming fluid showing non-Newtonian rheology. By applying shear flow in the interface, we detect that the surface tension depends on the shear rate. Importantly, the standard way of determining surface tension from the pressure drop across the interface gives rise to an effective surface tension in the non-Newtonian fluid that mixes bulk and interface properties. We show how the pressure anisotropy can be used to clearly define the bulk and interface regions and extract a genuine shear-rate dependent surface tension. The results have implications for measurement techniques related to interfacial rheology of complex fluids.
format	Preprint
id	arxiv_https___arxiv_org_abs_2503_08611
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Shear-Rate Dependent Surface Tension of Glass-Forming Fluids Heitmeier, Linnea Voigtmann, Thomas Soft Condensed Matter We investigate the interface of a glass-forming fluid showing non-Newtonian rheology. By applying shear flow in the interface, we detect that the surface tension depends on the shear rate. Importantly, the standard way of determining surface tension from the pressure drop across the interface gives rise to an effective surface tension in the non-Newtonian fluid that mixes bulk and interface properties. We show how the pressure anisotropy can be used to clearly define the bulk and interface regions and extract a genuine shear-rate dependent surface tension. The results have implications for measurement techniques related to interfacial rheology of complex fluids.
title	Shear-Rate Dependent Surface Tension of Glass-Forming Fluids
topic	Soft Condensed Matter
url	https://arxiv.org/abs/2503.08611

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