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Topic Name: Nozzle and Liquid Effects on the spray modes in Nanoelectrospray
Category: Nanocharacterization
Research persons: Paine M.D., Alexander M.S., Stark J.P.W.,
Location: Mile End Road, London,E1 4NS, United Kingdom
Details
Unforced nanoelectrospray can exhibit a number of stable spray modes. These include low frequency pulsations, high frequency pulsations, and a steady cone-jet. Experiments are reported here on such pulsations that have been observed in various salt loaded solutions of ethylene glycol, triethylene glycol and water. The spray current was monitored with 1microsecond time resolution to show that spray regime characteristics depend on nozzle diameter and liquid conductivity. The frequency of pulsations was found to increase with both increased liquid conductivity and decreasing nozzle diameter. The charge ejected during a pulse is lower for smaller nozzles spraying higher conductivity liquids. Water solutions were observed undergoing high frequency pulsations, with these pulsations often occurring in lower frequency bursts. The frequencies of water pulsations were as high as 635 kHz but the charge ejected by each pulsation was an order of magnitude lower than that observed in triethylene glycol. An unforced electrospray of water was also identified as being in the steady cone-jet mode with a higher degree of confidence than previously. The values for stable pulsation frequency and charge ejected observed in ethylene glycol lay between those of TEG and water
About researcher :
Dr Matthew S. Alexander
BSc (Portsmouth), PhD (Manc)
Lecturer of Future Energy SystemsBusiness Tel: ++44(0)20 7882 5263
Fax: ++44(0)20 8983 1007
Email: m.s.alexander@qmul.ac.ukRoom 314
Department of Engineering
Queen Mary, University of London
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