Figure 2
From: Magnetic domain interactions of Fe3O4 nanoparticles embedded in a SiO2 matrix
TEM images show the dispersion of Fe3O4 NPs at different reaction times in the SiO2 matrix: (a,b) Agglomeration of NPs at 2 h and (c) SAED with characteristic rings of the Fe3O4 NPs; the intensity depends on the population density of NPs; (d,e) individual SSD in the SiO2 matrix after 4 h and (f) SAED with dispersion in amorphous SiO2 plus Fe3O4 NPs; (g,h) SSD+agglomeration of NPs at 8 h, and (i) SAED with dispersion in amorphous SiO2; agglomeration increases the intensity of the electron diffraction; (j,k) SSD+agglomeration of NPs; (l) diffraction is increased by the groups of NPs agglomerates.
