TA Instruments AR-G2 rheometer is a controlled stress, direct strain and controlled rate rheometer with a combined motor and transducer. Due to its magnetically-levitating thrust bearing and a “drag cup” motor technology, nano-torque can be applied to the sample. The low friction and inertia of the drag cup motor are ideal for creep and recovery measurements and allow an extended angular velocity range. Although designed according to the principles of traditional controlled-stress rheometers, the AR rheometers are better regarded as both controlled-stress and controlled-strain rheometers.

Our lab has an AR-G2 (2009) model, which is equipped with a non-contact “drag cup” motor with a temperature sensor, a magnetic thrust bearing, a dual porous carbon radial bearing, a low-inertia optical encoder and a normal force transducer. AR-G2 comes with the “Smart Swap” technology that automatically senses the temperature control system and the Smart Swap™ geometry recognition system that allows the automatic recognition of the geometry attached.

GENERAL TECHNICAL DATA

Minimum Torque Oscillation Controlled Rate (CR) mode: 0.003 μN.m
Minimum Torque Oscillation Controlled Sterss (CS) mode: 0.003 μN.m
Minimum Torque Steady CR: 0.01 μN.m
Minimum Torque Steady CS: 0.01 μN.m
Maximum Torque: 200 mN.m
Torque Resolution: 0.1 nN.m[1]
Motor Inertia: 18 μN.m.s
Angular Velocity Range CS: 0 to 300 rad/s
Angular Velocity Range CR: 1.4x10-9 to 300 rad/s
Frequency Range: 7.5x10-7 to 628 rad/s
Displacement Resolution: 25 nrad
Normal Force Range: 0.005 to 50 N

ACCESSORIES

We have the Peltier temperature control system with a temperature range of -20 to 200°C. The following geometries are also available.

Parallel plate
Diameter = 40mm

Cone – Plate
Diameter = 40mm, cone angle = 1°, gap = 29 μm

The following tests can be performed with the AR-G2:

Transient mode:
Creep and recovery test
Stress relaxation test

Steady mode:
Flow continuous
Flow peak hold
Flow stepped
Flow steady state
Flow temperature ramp
Flow squeeze/pull off test

Dynamic mode:
Oscillation frequency sweep test
Oscillation strain sweep test
Oscillation stress sweep test
Oscillation temperature sweep test
Oscillation temperature ramp test
Oscillation time sweep test
Oscillation manual ramp
Oscillation time/temperature sweep

Waveform and data sampling and analysis:
We can get the raw data directly from the AR-G2 since we have a waveform and fast data sampling. A preliminary fast analysis of data can be done with TA Data Analysis.