Electrospray Onset Study of Water-Ethanol Mixtures
نویسندگان
چکیده
The electrospray ionization (ESI) method is widely used in the analysis of biological molecules. The stable cone regime spray is usually obtained by the addition to the electrosprayed dipolar fluid of methanol or ethanol with the role of reducing the fluid surface tension. We investigate the spray onset voltages of water-ethanol mixtures of various concentrations starting from distilled water to pure ethanol. Positive or negative DC is applied separately in our measurements. The experimental setup allows for the study of nozzle-counter electrode gaps of up to 50 cm. Significant variations in the spray onset are observed and analyzed. Onset dependence is correlated to concentrations of water-ethanol binary mixtures. Smith’s formula is assessed for the tested mixtures. The results of the study may be instrumental to electrospray electrode design and spray control.
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