A mixture of 1-ethyl-3-methylimidazolium ethyl sulfate ( [ Emim ] [ EtSO 4 ] ) and hydroxylammonium nitrate (HAN) is an energetic monopropellant potentially suitable in a multimode chemical-electric microtube-electrospray micropropulsion system. In this work, electrospray plume mass spectra are compared between the monopropellant mixture and neat [ Emim ] [ EtSO 4 ] . This comparison clearly indicates new and additional species present in the plume due to the addition of HAN. Mass spectra from 20 to 600    amu / q were obtained over a variety of angles and flow rates from 2    pL / s to 3    nL / s in both cation and anion extraction modes. Mass spectra dependence on flow rate and angular orientation agree qualitatively well with literature. Results indicate the presence of HAN-based species in anion mode, but no HAN-based species in cation mode. Three of the four monomer species from the monopropellant are apparent in the plume; [ Emim ] + , [ EtSO 4 ] , and [ NO 3 ] are observed, whereas [ HA ] + is noticeably absent. Results also show emission of both proton-transferred covalent forms of HAN: [HA-H] and [ HNO 3 ] . Swapping of anion and cation species between the constituents of the monopropellant mixture is also observed.


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    Title :

    Hydroxylammonium Nitrate Species in a Monopropellant Electrospray Plume



    Published in:

    Publication date :

    2019-09-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English