Indirect Fourier Transform and Model Fitting of Small Angle Neutron Scattering from Silica Nanoparticles
Indirect Fourier Transform and Model Fitting of Small Angle Neutron Scattering from Silica Nanoparticles
复制标题
二氧化硅纳米颗粒小角中子散射的间接傅立叶变换和模型拟合
DOI：
10.1002/ppsc.201000006
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发表时间：
2010
影响因子：
2.7
通讯作者：
N. Wagner
中科院分区：
文献类型：
--
作者：
N. Hould;R. Lobo;N. Wagner
使用模型拟合和间接傅里叶变换方法解释了体积分数范围为 0.01 至 0.315 的球形二氧化硅纳米颗粒（〈D〉= 27.5 nm）的小角中子散射（SANS）图案。通过使用双汤川势对有效结构因子进行建模，确定粒子通过弱长程吸引力和短程排斥粒子间力相互作用。对于弱相互作用粒子 (∼ 0.01 v/v)，使用多分散球体形状因子对 SANS 模式进行分析既简单又准确。然而，我们发现间接傅立叶变换是一种更稳健的方法，可以计算较宽的颗粒浓度范围内相互作用的颗粒的径向分布函数。
Small angle neutron scattering (SANS) patterns from spheroidal silica nanoparticles (〈 D 〉 = 27.5 nm) dispersed in water at volume fractions ranging from 0.01 to 0.315 were interpreted using model fitting and indirect Fourier transform methods. By modeling the effective structure factor using a two‐Yukawa potential it was determined that the particles interact through weak long range attractive and shorter range repulsive inter‐particle forces. For weakly‐interacting particles (∼ 0.01 v/v) analysis of SANS patterns using a polydisperse spheres form factor is simple and accurate. However, we find that the indirect Fourier transform is a more robust method to calculate the radial distribution function for interacting particles over a broad range of particle concentrations.