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Controlling the transition of emulsion process from dripping to jetting in a flow-focusing microcapillary device

JIAN GANG WANG1, LIANG MA1, QIANG YANG1, YANG QIU1, HUA LIN WANG1,*

Affiliation

  1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China

Abstract

The monodispersed microspheres were fabricated using a flow-focusing microcapillary device. The emulsification of monomer TPGDA in water solution was controlled through the adjustment of internal and outer phase flow rates. Results showed flow rates and the interface of internal and outer phase contributed to the different emulsion processes and differences in product size. With the increase of Ca from 0.12 to 0.24, the mechanism changed from dripping to jetting. When Ca increase to a value between 0.24 and 2.4, the mechanism changed to periodical dripping. Only the dripping mechanism creates microspheres whose radius is determined by the orifice size..

Keywords

Microfluidics, Flow-focusing device, Mono-dispersed microspheres, Emulsions.

Citation

JIAN GANG WANG, LIANG MA, QIANG YANG, YANG QIU, HUA LIN WANG, Controlling the transition of emulsion process from dripping to jetting in a flow-focusing microcapillary device, Optoelectronics and Advanced Materials - Rapid Communications, 9, 11-12, November-December 2015, pp.1557-1560 (2015).

Submitted at: Sept. 11, 2015

Accepted at: Oct. 28, 2015