Figure 1. The SEM and TEM images of zinc-nickel citrate yolk-shell (a–c), solid (d–f) and hollow (g–i) microspheres.
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.