Figure 2.
Representative scanning electron microscopy (SEM) micrographs for (A) CH-I; (B) CH/HA-II(b) and (C) CH-PLA/HA-II(b) microspheres (arrows denote the cracked clumps and irregularly shaped beads).
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.