Abstract:This work summarizes the theory for analyzing spin-echo small-angle neutron scattering (SESANS) data, especially for colloids. The SESANS spatial correlation function is calculated by taking the Abel transform of the density fluctuation correlation function in real space. This study also analyzes the spherical particle polydispersity effect on the SESANS spatial auto-correlation function. Thermodynamic self-consistent closure is used to solve the Ornstein-Zernike function to calculate the SESANS spatial structural correlation function. The SESANS theory for colloids with both short-range attraction and long-range repulsion shows that, unlike with traditional small angle scattering, SESANS can conveniently study the phase transition from the dispersed state to the percolation state as the colloid volume fraction increases. SESANS can characterize materials in real space to effectively reveal the structure and phase transition of colloidal systems.
宋璟, 孙光爱. 利用自旋回波小角中子散射技术分析胶体系统的结构[J]. 清华大学学报(自然科学版), 2022, 62(3): 627-632.
SONG Jing, SUN Guang'ai. Analysis of colloidal system structures using spin-echo small-angle neutron scattering. Journal of Tsinghua University(Science and Technology), 2022, 62(3): 627-632.
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