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.
Scanning Electron Microscopy images of the tip of a representative set of micro-funnels fabricated with the optimized conditions (9 M KOH, 65 °C with no stirring). The openings were 600 μm width and the etching was performed to a 500 μm depth.
