Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Transmission electron microscopy (TEM) images (a,d,g), high resolution TEM (HR-TEM) (b,e,h), respectively, selected area electron diffraction (SAED) spectrums (c,f,i) for Fe3O4 (a–c), Fe3O4@PEG 20 K (d–f) and Fe3O4@PEG 35 K (g–i). Red arrows in (b,e,h) indicate (220) crystalline plane.
