Surfactant Monolayers at Heptane-water Interfaces

Abstract

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 heptane/water 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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Document Details

Document Type
Technical Report
Publication Date
May 26, 2020
Accession Number
AD1101923

Entities

People

  • Ramagopal Ananth
  • Xiaohong Zhuang

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Chemistry
  • Climate Change
  • Coefficients
  • Department Of Defense
  • Diffusion Coefficient
  • Fire Suppression
  • Glycosides
  • Hydrogen Bonds
  • Hydrophilic Properties
  • Hydrophobic Properties
  • Military Research
  • Molecular Dynamics
  • Molecules
  • Physical Chemistry
  • Polymers
  • Square Roots

Fields of Study

  • Chemistry

Readers

  • Data Mining and Knowledge Discovery.
  • Fire Suppression Systems Design.
  • Quantum Chemistry