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RheoSANS
The NCNR has two Anton Paar MCRXX1 series stress-controlled rheometers available to simultaneously probe the shear rheology and the material microstructure using SANS. The flow geometry consists of a Couette type cell and SANS can probe the 1,3 and 2,3 planes of flow. Neutron transparent quartz and titanium inner and outer cylinders are available with flow gaps ranging from 0.5 mm to 1.5 mm. The sample volumes range from 3.5 ml for the smallest combination up to 14ml for the largest.
A range of rheological tests can be performed in conjunction with SANS, from basic steady shear mode to more advanced time-dependent measurement such as large-amplitude oscillatory shear (LAOS) mode. For steady shear mode, the SANS measurements and the rheological measurements are synched using a series of TTL on/off signals. Multiple shear measurements can be recorded between each SANS measurement and multiple SANS data sets can be measured at a single shear rate. For repeatable, time-dependent behavior of a sample, the time relative to the start of each repeat can be assigned to each neutron captured by the detector, in addition to the coordinate position of the event on the detector. Using post-processing techniques, multiple histograms can be made from original data for a specific time region along each repeat or oscillation.
Specifications
| Accuracy | 1% of maximum value |
| Torque Range | 0.05 µNm - 230 mNm |
| Torque Resolution | 0.1 nNm |
| Speed Range | 10-7 min-1 to 3000 min-1 |
| Angular Deflection | 0.1µrad to ∞ |
| Angular Frequency Range | 10-5 rad/s to 628 rad/s |
| Temperature Range | −40 to 200 °C |
| Quartz Cup Diameter(s) (ID) | 50 mm |
| Titanium Cup Diameter(s) (ID) | 50 mm, 30 mm, 29 mm, 28 mm |
| Quartz Bob Diameter(s) (ID) | 49 mm, 29 mm |
| Titanium Cup Diameter(s) (ID) | 49 mm, 48 mm, 29 mm, 28 mm, 27 mm |
| Sample Volume, 50mm cup-49mm bob | 11 ml |
| Sample Volume, 50mm cup-48mm bob | 14 ml |
| Sample Volume, 30mm cup-29mm bob | 3.75 ml |
| Sample Volume, 29mm cup-28mm bob | 3.5 ml |
Papers and Posters
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Rheo–small-angle neutron scattering at the National Institute of Standards and Technology Center for Neutron Research, Porcar L., Pozzo D., Langenbucher D., Moyer J., Butler P.D., Rev. Sci. Instruments, 82 083902 (2011)
- Time Dependent SANS Sample Environment Capabilities at NIST - 2014 American Conference on Neutron Scattering (ACNS) meeting
- Rheo-SANS at NIST Center for Neutron Research - 2006 Small Angle Scattering (SAS) meeting
- Rheo-SANS at the NIST Center for Neutron Research - 2004 American Conference on Neutron Scattering (ACNS) meeting
Contacts
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(301) 975-6650
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(301) 975-8396
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(301) 975-2020