ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Origin of shear-banding in wormlike micelles
Abstract: Wormlike micelles (WLMs) are elongated and semi-flexible aggregates formed by the self-assembly of surfactant molecules in aqueous solutions. Due to thermodynamic equilibrium, WLMs are constantly breaking and recombining, leading to complex non-linear rheological behavior. In particular, when flowing in a channel over specific conditions, a heterogeneous structural ordering, called shear-banding, occurs. The impact of wall slip on the origin of shear-banding is still an open question. To close this gap, we aim to probe the near-surface structure of WLMs under shear by GISANS. Here, WLMs are formed with cetyltrimethylammonium bromide (CTAB) mixed with Sodium Salicylate (NaSal) in D2O. The substrate over which WLMs slips is a smooth silicon wafer. With different NaSal concentrations, we will probe the influence of the contour length and entanglements of the WLMs on the alignment at the wall surface. Using a homemade flow cell easily rotatable under the neutron beam, we will compare the near-wall alignment of the micelles at rest and under flow with different shears. We aim to probe the in-plane structure of WLMs near the wall parallel and perpendicular to the flow direction, by applying depth-resolved grazing incidence time of flight neutron scattering (ToF-GISANS) on the SANS2D beamline. Integrating the intensities over different wavelength intervals will allow us to probe different penetration depths, and thus compare the near-wall alignment of WLMs to the bulk structure.
Experimenter: Dr Marion Grzelka
Local Contact: Dr Sarah Rogers
Experimenter: Mr Edward Grünewald
Experimenter: Dr Alexis Chennevière
Experimenter: Dr Viviane Lütz Bueno
DOI: 10.5286/ISIS.E.RB2320255
ISIS Experiment Number: RB2320255
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2320255-1 | SANS2D | 02 December 2026 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
The recommended format for citing this dataset in a research
publication is as:
[author], [date], [title], [publisher],
[doi]
For Example:
Dr Marion Grzelka et al; (2024): Origin of shear-banding in wormlike micelles, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2320255
Data is released under the CC-BY-4.0 license.
