Figure 5
From: A biomimetic design for a sialylated, glycan-specific smart polymer
Characterization data of the polyethyleneimine-grafted-L-aspartate-L-phenylalanine dimethyl ester (PEI-g-DF)-modified mSiO2@SiO2@Fe3O4 core–shell microspheres. (a–c) X-ray photoelectron spectroscopy (a), FT-IR spectroscopy (b) and thermal gravimetric analysis (c) of mSiO2@SiO2@Fe3O4 before (black lines) and after PEI-g-DF modification (red lines). (d) Comparison of the hydrodynamic radius distribution of Fe3O4, SiO2@Fe3O4, mSiO2@SiO2@Fe3O4 and PEI-g-DF@mSiO2@SiO2@Fe3O4 measured by dynamic light scattering in pure water. (e) Microscopic morphology and elemental distribution of PEI-g-DF@mSiO2@SiO2@Fe3O4 observed by a scanning electron microscope with energy-dispersive X-ray spectroscopy. The EDX spectra of mSiO2@SiO2@Fe3O4 before and after modification with PEI-g-DF are displayed in Supplementary Figure 10.
