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) Emission study of PDI-hexamer supramolecular gels showing fiber bundles (38), reproduced from ref . Copyright [2011] Royal Society of Chemistry. (b) Polarizing optical microscopy of J-aggregate-forming PBI gels (39), reproduced from ref . Copyright [2008] Wiley-VCH.
