Figure 13.
Samples placed at a temperature of 0°C on the eighth day. A) Envelope containing 3 wt% silver nano-powder. B) Control. C) Envelope containing 5 wt% silver nano-powder. D) Control.
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.