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.
TEM images of PS hollow beads containing ioversol in the interiors. The holes were closed by heating the PS hollow beads at 95 °C for 45 min in aqueous solutions containing: a,b) 25%, c,d) 51%, and e,f) 74% of ioversol. The samples were collected by centrifugation and thoroughly washed with ethanol and dried at 75 °C for 5 min to completely remove the water inside the beads prior to TEM characterization.
