Simulation of the Formation and Fission of Charged Droplets in Electrospray Ion Source†

doi:10.7503/cjcu20150812

Abstract

Abstract:

The Fluent software was used to simulate the formation and fission of charged droplets in electro-spray ion source based on the transport behavior of liquid in electrospray ion source(ESI) and constructed. The influence of the capillary voltage, ion source temperature and surface tension on droplet size distribution was studied. The results indicate that high capillary voltage, high source temperature, and low surface tension lead to smaller charged droplets and better breakup, which is in consistency with the study in published literatures and the calculation with empirical formula in this work.

Key words: Fluent simulation, Electrospray, Charged droplet, Particle size distribution

CLC Number:

O657

TrendMD:

HUANG Zhaoliang, GAO Fangyuan, WANG Boliang, ZHANG Weibing. Simulation of the Formation and Fission of Charged Droplets in Electrospray Ion Source^†[J]. Chem. J. Chinese Universities, 2016, 37(4): 633.

Figures/Tables 5

Fig.1 Structural model of the electrospray ion source

Fig.2 Simulation of Taylor-cone and jet of ethanol at 2000 V

Table 1 Size distribution of charged droplets at diffe-rent capillary voltages(t=120 μs)

Diameter/m	Size distribution(%)
Diameter/m	2000 V	3000 V	5000 V
>1.0×10^-7	14	2	0
7.5×10^-8—1.0×10^-7	8	0	0
5.0×10^-8—7.5×10^-8	25	0	0
2.5×10^-8—5.0×10^-8	27	11	3
<2.5×10^-8	16	99	132

Fig.3 Effect of source temperature on droplets size distribution at 5000(A) and 2000 V(B)(t=120 μs)

Fig.4 Size distribution of charged droplets with surface tension of 50 mN/m and 10 mN/m(t=120 μs)

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