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.
A crosslinked structure of a polymeric hydrogel. The effective area of diffusion for solutes is characterized by the average mesh size (ζ) of the hydrogels. The solutes with diameters smaller than ζ (indicated by dark circles) easily diffuse through the hydrogel network (Modified from Reference [9]).
