Influence of liquid properties and process parameters on nanoelectrospray behaviour in both continuous and pulsed voltage operation

Hill, Rebecca (2020) Influence of liquid properties and process parameters on nanoelectrospray behaviour in both continuous and pulsed voltage operation. Doctoral thesis, University of East Anglia.

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Abstract

Nanoelectrospray (nES) is a technique where liquid ejection is controlled purely by the applied voltage. A systematic study into the effect of the liquid properties and process parameters, on nES behaviour has been conducted. Testing was performed using both a continuous and pulsed voltage, where both pulsation and stable cone-jet modes were observed.

In continuous voltage operation the pulsation frequency (f) increases linearly with the applied voltage. Plotting the effect of the emitter outer diameter (OD) on the pulsation frequency against the magnitude of the _eld strength above the onset for pulsations (Estep), it was found that the data collapsed giving the same df=dEstep. In pulsation mode the charge emitted is influenced by each process parameter, with a greater charge being emitted for a higher viscosity and larger emitter OD, but smaller in relation to a higher conductivity.

In pulsed voltage operation, the magnitude of the applied voltage is important in determining the spray mode and on controlling a single ejection. The combination of parameters was found to influence the formation time and the ejected volume, where the volume increased with the magnitude of the voltage pulse. The emitter-to-substrate distance (ESD) has an effect on the height and width of the current transient, with the greatest ESD giving the smallest ejected volume. The maximum ESD to achieve a discrete droplet is dependent on the combination of viscosity, conductivity, and emitter OD.

Item Type:	Thesis (Doctoral)
Faculty \ School:	Faculty of Science > School of Mathematics
Depositing User:	Chris White
Date Deposited:	20 Dec 2021 13:46
Last Modified:	20 Dec 2021 13:46
URI:	https://ueaeprints.uea.ac.uk/id/eprint/82739
DOI:

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