Accession Number : AD1026617


Title :   Micro And Nanostructured Materials For Fluid And Ion Transport For Miniaturized Applications


Descriptive Note : Technical Report,09 Sep 2014,08 Mar 2016


Corporate Author : Massachusetts Institute Of Technology Cambridge


Personal Author(s) : Lozano,Paulo


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1026617.pdf


Report Date : 08 Jun 2016


Pagination or Media Count : 12


Abstract : Ionic Liquid Ion Sources (ILIS) are devices capable of producing molecular ion beams through electrostatic stressing of room temperature molten salts, or ionic liquids. These ion beams can be applied in space propulsion, in focused ion beams for microfabrication and in reactive ion etching. To achieve ion evaporation from the ionic liquid, the liquid is supported on a micron-sized emitter tip. The emitter is subjected to an electric field to deform the liquid into a sharp meniscus, at the apex of which the electric field can be high enough to trigger ion evaporation. Novel emitter configurations are required to guarantee the stable operation of these sources in the pure ion regime (PIR) with no intervening droplets. With AOARD support, analytical estimates have been performed to determine tip geometries and substrates morphologies required for the emitter to support PIR operation. Furthermore, novel nanomaterials have been investigated as alternative ILIS substrates. In particular, porous carbon xerogels have been identified as emitter materials, as they have outstanding pore uniformity, are easy to shape into the required geometries, and are compatible with ionic liquids. These substrates also have the adequate pore sizes and porosities established by the analytical estimates.


Descriptors :   ionic liquids , nanostructures , miniaturization , electric fields , electron emission , ion beams , transport properties


Subject Categories : Particle Accelerators
      Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE