Fig. 2.
(a) paper bags are filled with fumed silica by a packing machine (b) mobile cart for nanoparticle exposure assessment in fumed silica factory (c) pouring the sol-gel silica powder into the injection hole of jet mil and show the mobile cart
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.