期刊
APPLIED PHYSICS LETTERS
卷 96, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3424791
关键词
drops; electrohydrodynamics; microfluidics
资金
- Texas A&M University (TAMU)
- Fundacion Seneca-Agencia de Ciencia y Tecnologia
Applications of electric field, using either dc or high-frequency ac field, have shown many advantages in emulsification. We further develop this technique by a detailed study on low-frequency ac electro-flow-focusing (EFF) microfluidic emulsification. Counter-intuitively, the droplet size variation is not monotonic with the electric field, in contrary to the dc-EFF emulsification. This phenomenon originates from a relaxation oscillation of flow rate through the Taylor cone. Particularly, a continuous droplet size decrease was obtained at the voltage ramp-up stage. This emulsification process was modeled in analog to the accumulation and release of charges in an RC electric circuit with an adjustable resistor.
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