A method of time-of-flight small-angle neutron scattering (TOF-SANS) has been developed based on the iMATERIA powder diffractometer at BL20, of the Materials and Life Sciences Facility (MLF) at the high-intensity proton accelerator (J-PARC). A large area detector for SANS, which is composed of triple-layered 3He tube detectors, has a hole at its center in order to release a direct beam behind and to detect ultra-small-angle scattering. As a result, the pulsed-neutron TOF method enables us to perform multi-scale observations covering 0.003 < q (Å-1) < 40 (q_max/ q_mix =1.3x104) and to determine the static structure factor S(q) and/or form factor P(q) under a real time & in-situ conditions. Our challenge using unique sample accessories of a super-conducting magnet and polarized neutron is dynamic nuclear polarization (DNP) for contrast variation, especially for industrial use. In this seminar, we report DNP SANS to study (i) tire rubber and its crosslinks and (ii) Nafion® polymer electrolyte membrane swollen by water.
Dr. Jitae Park
Dr. Dominic Hayward