Accessory for MCR:
Interfacial Rheology System
- Accessory for extended material characterization
- Highly precise studies of the flow properties of interfacial layers
- Comprehensive rheological investigations of emulsion and foam stability
The Interfacial Rheology System (IRS) for the MCR series enables you to study the flow properties of two-dimensional liquid-liquid and liquid-air interfaces. As the viscoelastic properties of the adsorbed interfacial layer correlate with emulsions and foam stability, interfacial rheology is essential in the development of foams and emulsions. In contrast, bulk rheology is the study of flow in three-dimensional fluids. The measurement, performed with the typical unmatched accuracy of the MCR rheometer series, is done with a bi-cone measuring geometry or a Du Noüy Ring, positioned directly in the interface.
Analyze emulsion and foam stability on your MCR rheometer
An MCR rheometer combined with an Interfacial Rheology System enables the measurement of the flow and viscoelastic properties directly in the interface of interfacial layers. These properties directly correlate with the rheology of emulsions and foam stability. Integrated Peltier elements allow you to set the sample temperature in the range from 5 °C to 70 °C. Measurements can be performed in rotational and oscillatory mode for extended analysis, e.g. flow curves and creep tests at an interfacial layer or oscillatory tests during the film formation process.
Even for measuring weak interfacial structures and over the full viscosity range
The bi-cone measuring system (68 mm, 2 x 5°) with very sharp edges is placed in the layer interface and measures absorbed or spread films, e.g. films produced by proteins or surfactants. Even the weakest interfacial structures can be measured with the low-torque capabilities and the TruStrain™ feature (fast and accurate strain control due to improved real-time position control) of the MCR rheometer.
The bi-cone system and Du Noüy Ring geometry provide higher mechanical stability compared to alternative measuring geometries and this enables the measurement of a unique range of interfacial viscosities, from extremely low to very high values. The normal force sensor in the air bearing of the MCR rheometer allows the accurate and automated positioning of the bi-cone in the interface to guarantee the highest accuracy and reproducibility.
The full range of analysis possibilities in shear rheology
RheoCompass, the proven rheometer software, is able to compensate the influence of the bulk and upper phase of the flow field in the Bi-cone system directly after the measurement. The analysis takes into account the complex coupling of the interface with the liquid sub-phase and reveals absolute interfacial shear rheology properties. All measured and calculated interfacial data is recorded and displayed. Moreover, predefined interfacial rheology workbooks are available for fast and convenient operation.
Choose the ideal interfacial rheology setup according to your specific needs
The IRS is also available as a “small sample volume” version, reducing the needed sample volume to 40 mL, which is especially important for materials that are only available in a limited amount. Furthermore, the system can be connected to a flow-through option, which makes it possible to change the composition of the interfacial system directly within the measuring device and even during the rheological test. This enables the direct and real-time analysis of effects caused by e.g. changes in pH value, salt concentration, or the introduction of new surface active ingredients. It is also possible to investigate interfacial transport processes and their connection to rheological properties. Even a Langmuir trough can be integrated in order to create interfacial layers with controlled packing density.
Deeply explore the rheology of emulsions, suspensions, and foams
Interfacial rheology plays an important role in many products and processes. Whenever there is a two-dimensional liquid/liquid or gas/liquid interface, the distinct rheological properties should be investigated since they determine the behavior and stability of e.g. suspensions, emulsions, and foams. Typical examples are surfactants and surface active polymers which are used for stabilizing emulsions and foams in the food and cosmetic industries in order to improve shelf life.
Other examples for such materials include:
- Food products, e.g. coffee crema
- Consumer products, e.g. detergents
- Pharmaceuticals and cosmetics, e.g. encapsulation, drug release, soap
- Oil industries, e.g. water-oil systems
- Life science and medicine, e.g. eye drops, body liquids
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