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Time Resolved Polarised Grazing Incidence Neutron Scattering from Composite Materials
Maximilian Wolff1, Apurve Saini2, David Simonne3
1Department for Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, 752 37 Uppsala, Sweden. max.wolff@physics.uu.se.
Polymers
|April 10, 2019
Summary
Neutron scattering reveals how polymer solutions with magnetic nanoparticles change under shear. Experiments show the crystal structure
Area of Science:
- Material Science
- Polymer Science
- Neutron Scattering
Background:
- Neutron scattering is valuable for studying light elements and magnetic induction in materials.
- Low neutron source brilliance challenges kinetic studies, especially with periodic excitations.
- Binning scattering data by sample excitation state can overcome brilliance limitations.
Purpose of the Study:
- To perform polarized and time-resolved grazing incidence neutron scattering on F127 polymer solutions with magnetic nanoparticles.
- To investigate the feasibility of such experiments for studying magnetically tunable polymer crystals and meta-crystals.
- To explore the relationship between shear rate and the structure of the resulting micellar crystal.
Main Methods:
- Utilized polarized and time-resolved grazing incidence neutron scattering.
- Investigated an aqueous solution of F127 polymer mixed with magnetic nanoparticles.
- Analyzed the intensity of the 111 Bragg peak of the face-centered cubic (fcc) micellar crystal.
Main Results:
- Demonstrated the feasibility of polarized and time-resolved grazing incidence neutron scattering for these systems, despite weak initial signals.
- Observed that the intensity of the 111 Bragg peak of the fcc micellar crystal is dependent on the applied shear rate.
- Found that the 111 Bragg peak intensity is maximized at the lowest shear rates and minimized at the highest shear rates.
Conclusions:
- Polarized and time-resolved grazing incidence neutron scattering experiments are feasible for studying polymer-nanoparticle composites.
- The micellar crystal structure in F127/magnetic nanoparticle solutions is sensitive to shear rate.
- This technique offers potential for understanding magnetically tunable meta-materials.
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