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.
Droplets of different sizes. Droplets were denoted as (a–c) and (d) from big to small, in which (c1) was the same size as (c2). (a) was a microsphere with many small cores; (b) was a microsphere with two layers; (c1,c2) were microspheres with three layers; (d) was a single emulsion. The scale bar is 200 µm.
