An official website of the United States government
Here's how you know
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.
(Color online) Nafion tube (a) just before and (b) just after puncture. Views are from bottom up. The wall of the Nafion tube is shown in the center of the image, with microspheres visible as dots. The suspension flows from the outside of the tube (left) to the inside of the tube (right).