Figure 2.
Contact angles of a drop of water on the four different surfaces. Identical lower-case letters indicate statistically equivalent values (p > 0.05).
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.