SANS measurements were performed at the general-purpose SANS (CG2) beamline of the high-flux isotope reactor at the Oak Ridge National Laboratory (ORNL). To cover the q range of interest, two SANS configurations with different neutron wavelengths/sample-to-detector distances, i.e., 4.75 Å/4.9 m and 12 Å/19.4 m, were chosen. Here, q is the magnitude of the scattering vector defined as q = |q| = 4πλ−1 sinθ, with λ and θ being the wavelength of the incident neutron beam and half of the scattering angle, respectively. Scattered neutrons were collected using a 2D position sensitive 3He detector with a 1 m by 1 m active area, composed of tube detectors providing 256 × 192 pixels. The composite samples were loaded onto 1-mm-thick quartz disks, and the scattered beam was collected at each SANS configuration. The raw 2D SANS data were corrected for detector response, dark current, and scattering from solvents and background before being azimuthally averaged to produce the 1D SANS profiles, i.e., I(q) versus q profile. The data were placed on an absolute scale (cm-1) using a measured direct beam.

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