Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering

Wang Dan¹, Lin Bingbing¹, Shen Taipeng¹, Wu Jun¹, Hao Fuhua², Xia Chunchao³, Gong Qiyong³, Tang Huiru², Song Bin³, Ai Hua^{1, 3, †,}

SAXS plots shown after background subtraction and normalization. Scattering vector q values, representative of average interparticle spacing, shifted steadily downward representing the increase in spacing distance. Scattering vector q was calculated from the scattering angles (2θ) using q = 4π/λsin(2θ/2), where 2θ is the scattering angle and λ is the x-ray wavelength. SPIO interparticle spacing were calculated from the principal scattering maxima (q*) using d = 2π/q*.