Surfactant Monolayers at Heptane-water Interfaces
Technical Report,21 Feb 2018,20 Feb 2020
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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To develop fluorine-free aqueous foam for effective fire suppression, molecular dynamics MD simulations are performed to study the effect of structure of surfactants on the surfactant monolayer properties at the heptanewater interfaces. The results show that the hydroxyl-capped trisiloxane is a better candidate than methoxyl-capped trisiloxane the alkylglucoside with hydrocarbon length of 8 or 9 may be best candidate the Beta- and alpha, beta-1 greater than 4-alkyl glucoside are much better candidate than the alpha- and alpha, beta-1 greater than 6-alkyl glucoside the neutral charged hydrocarbon surfactants have lower heptane transport rate less heptane in the interface region than that of the charged hydrocarbon. Two Glucopon-based hydrocarbon surfactants g215 and g225 have very similar interface properties trisiloxane with oxyethylene length of 7 or 8 have lower heptane transport rate than the length of 11.
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