Abstract
We applied these methods of small-angle neutron scattering (SANS) and neutron spin echo (NSE) on a swollen poly ( N -isopropyl acrylamide) (NIPA) gel in order to observe the elastic scattering of frozen concentration fluctuations due to crosslinks. We successfully obtained the structure factor for the frozen concentration fluctuations in a q -domain of q >0.01 A m 1 , while in a q -domain of q <0.01 A m 1, this attempt failed due to the limited performance of the q -resolution and the Fourier time t F of the current specifications of the NSE spectrometers. This technical hurdle for the spectrometer should be overcome on an intensified neutron source for the next generation, realizing t F of w s-order and the q -resolution down closer to 0.001 A m 1.
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