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Updated: May 23, 2026

Double Emulsion Generation Using a Polydimethylsiloxane (PDMS) Co-axial Flow Focus Device
Published on: December 25, 2015
Behavior of double emulsions in a cross-type optical separation system
Kyung Heon Lee1, Sang Bok Kim, Sang Youl Yoon
1Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea.
Abstract:
The behavior of double emulsions in a cross-type optical particle separation system was studied for different combinations of refractive indices and different inner and outer layer radii. The radii and refractive indices of the double emulsions were easily adjusted by taking advantage of the coflowing geometry of a cross-type optical particle separation device. An analytical expression of the optical forces on a pair of concentric spheres was derived using the photon stream method in the ray optics regime. The predicted trajectories of the double emulsions by the optical force agreed well with the experimental data. This work has potential uses in cell separation by morphometry, drug delivery vehicle, and emulsion-based biomedical applications.
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