In-situ temperature-controllable shear flow device for neutron scattering measurement--an example of aligned bicellar mixtures

The Review of Scientific Instruments
Yan XiaMu-Ping Nieh

Abstract

We have designed and constructed a temperature-controllable shear flow cell for in-situ study on flow alignable systems. The device has been tested in the neutron diffraction and has the potential to be applied in the small angle neutron scattering configuration to characterize the nanostructures of the materials under flow. The required sample amount is as small as 1 ml. The shear rate on the sample is controlled by the flow rate produced by an external pump and can potentially vary from 0.11 to 3.8 × 10(5) s(-1). Both unidirectional and oscillational flows are achievable by the setting of the pump. The instrument is validated by using a lipid bicellar mixture, which yields non-alignable nanodisc-like bicelles at low T and shear-alignable membranes at high T. Using the shear cell, the bicellar membranes can be aligned at 31 °C under the flow with a shear rate of 11.11 s(-1). Multiple high-order Bragg peaks are observed and the full width at half maximum of the "rocking curve" around the Bragg's condition is found to be 3.5°-4.1°. It is noteworthy that a portion of the membranes remains aligned even after the flow stops. Detailed and comprehensive intensity correction for the rocking curve has been derived based on the finite r...Continue Reading

References

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Citations

Mar 10, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Norbert KučerkaDaniela Uhríková
May 16, 2019·European Biophysics Journal : EBJ·P HrubovčákN Kučerka

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