THE RAYLEIGH LIMIT OF CHARGE REVISITED - LIGHT-SCATTERING FROM EXPLODING DROPLETS

被引:75
作者
DAVIS, EJ
BRIDGES, MA
机构
[1] Univ of Washington, Seattle, United States
基金
美国国家科学基金会;
关键词
D O I
10.1016/0021-8502(94)90208-9
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Droplet fission associated with charged droplets has been re-examined to explore the issue of droplet fission prior to reaching the classical Rayleigh limit. Elastic scattering from an evaporating electrodynamically levitated droplet has been used to determine the coulombic charge and droplet size at the onset of droplet explosion. Since precise determination of the charge requires knowledge of the electric field in the levitator, computations of the a.c. and d.c. electric fields were performed as part of the study. The light-scattering data consist of angular scattering measurements and morphological resonance spectra made prior to and subsequent to droplet explosion. Water droplets containing sodium dodecyl sulfate (SDS) surfactant and 1-dodecanol droplets were used in the experiments. The aqueous solution droplets were 4-15 mum in diameter when they exploded, and the 1-dodecanol droplets were typically 10-20 mum in diameter. Both types of droplets fissioned at approximately 90% of the theoretical Rayleigh limit. In an attempt to determine if the external electric field led to this prior explosion, a second a.c. field (30-100 kHz) was superposed on the normal d.c. field and 60 Hz a.c. field used for electrodynamic trapping of the organic droplets. The external field was found to have no effect on the stability characteristics of the droplet.
引用
收藏
页码:1179 / 1199
页数:21
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