Accession Number : AD1036950


Title :   Ionic Liquid Fuels for Chemical Propulsion


Descriptive Note : Technical Report,01 Oct 2013,30 Sep 2016


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA EDWARDS AFB United States


Personal Author(s) : Schneider, Stefan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1036950.pdf


Report Date : 31 Oct 2016


Pagination or Media Count : 43


Abstract : Task I: Unfortunately, neither the cyanoborohydride approach nor the pure tetrakis-tetrahydroborate aluminate ILs discovered possess the desirable physical properties for a suitable propellant. In general, their major shortcomings still are poor liquid range and high viscosity as well as the high hydrocarbon content of the cations required to lower their melting points which severely limits propellant performance. In light of our discoveries we turned to systems simpler and higher performing than the complexed Al(BH4)4- anions. Solutions of Li-Al hydrides and LiBH4 in ethers have shown some desirable propellant properties and a variety of lithium metal hydrides are commercially available. This suggested an entry point into the coordination chemistry of lithium salts with some new high energy heterocyclic ring systems. Task II: In this work we have used a variety of complementary experimental techniques and theoretical approaches to elucidate the reaction mechanisms involved in the decomposition of energetic RTILs as a result of thermolysis, catalysis and oxidation. As our knowledge improves in these areas, it should be possible to build predictive numerical models for the accurate assessment of the performance and the state-of-health in RTIL monopropellant and bipropellant thrusters.


Descriptors :   density functional theory , energetic materials , flammability , borohydrides , lithium , ligands , salts , hypergolic fuels , chemical kinetics , IONIC LIQUIDS , physical properties , viscosity , CATIONS , MELTING POINT , thermolysis , catalysis , oxidation , PREDICTIVE MODELING , THRUSTERS , chemical reactions


Subject Categories : Liquid Rocket Propellants
      Physical Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE