Interfacial Fourier transform shear rheometry of complex fluid interfaces
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Nonlinear rheometry of interfaces is very challenging because of the limits of current day instrumentation and the intricate coupling of flows at interfaces and in the bulk. The use of time periodic flows may constitute a first step in addressing this issue. Fourier transform rheology (FTR) measurements with quasi-monolayers at the air-water interface are used in order to assess the suitability of the different devices to investigate nonlinear interfacial shear viscoelasticity. The probe material was a poly (methyl methacrylate) forming a soft glassy interface, whereas complementary measurements were performed with a polystyrene latex suspension forming a predominantly viscous interface at intermediate surface coverages. The obtained data with the magnetic rod rheometer (ISR) were compared against those obtained with the bicone and the double wall ring geometries attached to standard rotational rheometers. In particular, an unexpected appearance of even in addition to odd harmonics is discussed in terms of flow field asymmetry.
KeywordsInterfacial rheometry PMMA Fourier-transform-rheology LAOS Interfacial stress rheometer Bowditch-Lissajous plot
We thank Maria Kaliva for her help with grafting the glass rod and POM channel, and Nicolas Vogel and Markus Retsch for their help with the development of the particle purification procedure. We acknowledge Laurence de Viguerie for the help with the initial ISR measurements.
Partial support has been received by the European Commission (ITN “Comploids”, FP7-234810, and Horizon2020-INFRAIA-2016-1, EUSMI project no. 731019) and the Greek General Secretarial for Research and Technology (Heraclitos II program 2011).
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