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.
SEM images of PLLA mats electrospun at a traveling distance of 15 cm, a needle diameter of 0.50 mm, an applied voltage of 20 kV and a flow rate of 2 ml h−1: as-produced (a), crystallized at 70 °C for 48 h (b) and crystallized at 140 °C for 48 h (c,d). The scale bar corresponds to 5 μm in (a–c) and to 0.5 μm in (d).
