Model of the meniscus of an ionic liquid ion source.

Higuera Antón, Francisco (2008). Model of the meniscus of an ionic liquid ion source.. "Physical Review E", v. 77 (n. 2); pp. 1-11. ISSN 1539-3755. https://doi.org/10.1103/PhysRevE.77.026308.

Description

Title: Model of the meniscus of an ionic liquid ion source.
Author/s:
  • Higuera Antón, Francisco
Item Type: Article
Título de Revista/Publicación: Physical Review E
Date: February 2008
ISSN: 1539-3755
Volume: 77
Subjects:
Freetext Keywords: taylor cones, electrospray-ionization,electric-field, mass-spectrometry,evaporation,kinetics,energy, charge,dynamics,droplets
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A simple model of the transfer of charge and ion evaporation in the meniscus of an ionic-liquid ion source working in the purely ionic regime is proposed on the basis of order-of-magnitude estimates which show that, in this regime, _i_ the flow in the meniscus is dominated by the viscosity of the liquid and is affected very little by the mass flux accompanying ion evaporation, and _ii_ the effect of the space charge around the evaporating surface is negligible and the evaporation current is controlled by the finite electrical conductivity of the liquid. The model predicts that a stationary meniscus of a very polar liquid undergoing ion evaporation is nearly hydrostatic and can exist only below a certain value of the applied electric field, at which the meniscus attains its maximum elongation but stays smooth. The electric current vs applied electric field characteristic displays a frozen regime of negligible ion evaporation at low fields and a conduction-controlled regime at higher fields, with a sharp transition between the two regimes owing to the high sensitivity of the ion evaporation rate to the electric field. A simplified treatment of the flow in the capillary or liquid layer through which liquid is delivered to the meniscus shows that the size of the meniscus decreases and the maximum attainable current increases when the feeding pressure is decreased, and that appropriate combinations of feeding pressure and pressure drop may lead to high maximum currents.

More information

Item ID: 2167
DC Identifier: http://oa.upm.es/2167/
OAI Identifier: oai:oa.upm.es:2167
DOI: 10.1103/PhysRevE.77.026308
Official URL: http://pre.aps.org/toc/PRE/v77/i2
Deposited by: Memoria Investigacion
Deposited on: 03 Feb 2010 09:51
Last Modified: 20 Apr 2016 11:55
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