Interfacial Shear Rheometer ISR1
In shear rheology the experiments are performed such that the viscosity and elasticity of the interfacial layer are measured. Typical experiments are those using a torsion pendulum, as it is the case in our ISR1. The shear visco-elasticity is an excellent measure for the quantification of structure formations in interfacial layers. The ISR1 is an instrument with a very high sensitivity and is therefore suitable for less dense and rigid layers, where other shear instruments based on forced oscillations cannot be applied.
Measures interfacial shear rheology after torsion pendulum principle
This instrument allows measuring the interfacial shear elasticity and viscosity of layers between two fluids (liquid/liquid or liquid/gas). The main principle is a torsion pendulum. Different measuring bodies are used to work at liquid surfaces or at interfaces between two immiscible liquids. The Interfacial Shear Rheometer (ISR-1) allows unique shear rheological experiments. The instrument is suitable for studies of adsorption layers (GIBBS-layers) and spread layers (LANGMUIR-layers).
The instrument allows the following measurements:
frequency range between 0.2 and 0.02 Hz (depending on the measuring body and the torsion wire used) shear elasticity and viscosity of a surface layer time resolution about 1 minute
time dependencies over hours of interfacial age surface shear viscosity range 1µNs/m to 100 mNs/m surface shear elasticity range 1µPam to 100 mPam
temperature control in the range 10 to 50 °C
Technical Specifications:
Range of interfacial shear viscosity | 1 μNs/mto 100 mNs/m | ||
Range of interfacial shear elasticity | 1 μPam to 100 mPam | ||
Range of frequency | 0.2 0.02 Hz | ||
Angular resolution of torsion head | 0.01° | ||
Angular resolution of position sensor | 0.01° | ||
Data acquisition | via RS 232, USB | ||
Software | WINDOWS | ||
Measuring option | adsorbed and spread layers at liquid/gas and liquid/liquid interfaces | ||
Size of device (LxWxH) | 500x500x700 | ||
Weight: | 40 kg | ||
Power supply | 100 … 240 AC; 50 … 60 Hz; 110 W | ||
Extra accessories | measuring body (bi-conical disc) for liquid/liquid interfaces |