Electrospray cone-jet breakup and droplet production for electrolyte solutions

Abstract

The production of charge droplets via the electrospray of an electrolyte is experimentally and theoretically found to be a Coulombic fission phenomenon that occurs when induced space charge at the microjet interface reaches a critical density as the charge separation approaches the Bjerrum length. The field surrounding the cone is dominated by the Taylor harmonic, which is responsible for inducing space charge within an interfacial Debye layer, such that the jet breakup length and plume angle are strong functions of both the ionic strength and interfacial surface tension.

Electrospray Film Deposition for Solvent-Elimination Infrared Spectroscopy

“…Solute concentrations above the millimolar range cause the plume angle to vary accordingly. 77 In this study, however, the solute concentrations explored are sufficiently low that instrument parameters are robust over a large range of concentrations.…”

“…In this mode, jet stability and length depend on several parameters such as flow rate, solute concentration, solvent surface tension, and viscosity. 77 The single cone-jet mode is the most studied and commonly used mode in most ES applications, such as mass spectrometry and film deposition. In this mode, it is possible to control key parameters such as molecule ionization efficiency, ion current, droplets size, and film morphology.…”

Towards a new generation of microfluidic devices without microfluidic channels

“…These parameters can be separated into two main groups: (i) parameters of the fluid, and (ii) parameters of the setup. Parameters of the fluid found to have significant influence on its behavior are the surface tension of the fluid γ, its density ρ, conductivity σ, viscosity μ, and permittivity ε [6][7][8]. Parameters of the setup that affect the fluid behavior are the flow rate Q, capillary diameter r c , and the electric field E, effectively changed by varying the 978-1-4673-7516-0/15/$31.00 ©2015 IEEE capillary tip to ground plate distance h, and the applied voltage V [7].…”

Celebrating singularities: Mathematics and chemical engineering

“…A current effort in their laboratory is to understand the charging of the microjet and the mechanism behind the conic plume explosion. Fortunately, the dominant Taylor potential dominates the polarization/charging of the microjet and simple analysis can provide estimates for the length of the microjet and the aerosol plume cone angle . The cutoff mechanism for a geometric singularity is often of utmost importance but one can still use the dominant zero mode without the cutoff to analyze the physics of the cutoff.…”