"Surfactant"
I learn something new here most every day!
Web search of "Hydrazine Surfactant" gets hits, nowhere is hydrazine named a surfactant.
Small world - there's an OKC occurance.
http://www.okcitytrial.com/content/dailytx/043097p/PaulRydlundCrossExaminatio.html This is the testimony of a scientist on the OKC bomb. he mentions that hydrazine can serve the same purpose as "fuel oil" is said to have served in the OKC type of bomb. (No proportions are stated at the link so I think it's ok to hyperlink it here.) "Surfactant" comes up otherwise at the site.
So perhaps the terrorist interest in the chemical's explosive qualities comes from it's specific suitability to OKC type bombs.
Hydrazine - the terr's wonder chemical! Used for poisons for absorptive qualities (or some other quality). Also for explosions.