Interfacial wall-slip and its consequences on Lissajous plots

Fabian C. Birbaum, Sanna Haavisto, Antti Koponen, Erich J. Windhab, Peter Fischer

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Emulsions and foams are generally stabilized by low molecular weight surfactants, proteins, or by particles. The high adsorption energy of particle systems results in ultra-stable foams used in various industrial applications. In this study, hydrophobic silica and clay particles are compared due to their completely different particle network properties: Silica particles build strong networks in contrast to clay particles which have weak network structure. To measure the interfacial rheological properties of these networks a biconical geometry was used and the results are analyzed in stressstrain Lissojous plots. The rheological measurements were combined with microscopy and optical coherence tomography (OCT) to visualize the flow behavior of the interfacial layer. It turned out that non-linear Lissajous plots showed a parallelogram like shape. In addition, the rheological response of silica particle interfaces showed a characteristic oscillation in the horizontal part of the Lissajous plots. The optical measurements revealed that the particular shape of the Lissojous figures is caused by interfacial wall-slip at the biconus for the silica and at the cup wall for the clay particles. We propose that the truncation of the Lissajous plots can be correlated with the wall-slip. The results emphasize in combination with morphological information, Lissajous plots can help to understand complex nonlinear rheological behavior.
Original languageEnglish
Title of host publicationAbstract book of the 7th International Symposium on Food Rheology and Structure, ISFRS 2015
Place of PublicationZurich
PublisherInstitute of Food, Nutrition and Health IFNH
ISBN (Print)978-3-905609-67-7
Publication statusPublished - 2015
Event7th International Symposium on Food Rheology and Structure, ISFRS 2015 - Zürich, Switzerland
Duration: 7 Jun 201511 Jun 2015

Conference

Conference7th International Symposium on Food Rheology and Structure, ISFRS 2015
Abbreviated titleISFRS 2015
CountrySwitzerland
CityZürich
Period7/06/1511/06/15

Keywords

  • Lissajous plots

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    Birbaum, F. C., Haavisto, S., Koponen, A., Windhab, E. J., & Fischer, P. (2015). Interfacial wall-slip and its consequences on Lissajous plots. In Abstract book of the 7th International Symposium on Food Rheology and Structure, ISFRS 2015 Institute of Food, Nutrition and Health IFNH. https://isfrs.agrl.ethz.ch/isfrs/proc_2015/Abstracts_2015.pdf