Size characterization of core-corona spherical particles using model-free inverse Fourier transform method

POLYMER

卷:202

Article

Chen, Liwen¹  Lee, Sangwoo¹ 

[1] Rensselaer Polytech Inst, Dept Chem & Biol Engn, Troy, NY 12180 USA

关键词: Small-angle X-ray scattering;    Inverse Fourier transform;    Block copolymer micelles;   

DOI  :  10.1016/j.polymer.2020.122623

来源: Elsevier

【 摘 要 】

A simple model-free inverse Fourier transform method using a modification function for extraction of the size of spherical nanoparticles from small-angle scattering data is tested with particle models and employed for characterization of strongly-segregated poly(1,2-butadiene-b-ethylene oxide) (PB-PEO) diblock copolymer micelles in water at 30 degrees C-90 degrees C. Analysis of small-angle scattering profiles of model particles suggests that the inverse Fourier transform slightly underestimates the size of core domains of spherical particles due to the truncation of experimental scattering profile in the high scattering vector domain. However, this method correctly extracts the size of nanoparticles, including a solvent-swollen corona domain that is difficult to be evaluated using a form-factor analysis. The size of PB-PEO micelles obtained using the inverse Fourier transform method is consistent with the electron microscopy characterization result. The size of PB-PEO micelles decreases with the increase of temperature due to the lower critical solution temperature of PEO in water.

【 授权许可】

Free