Formation of polymeric hollow microcapsules and microlenses using gas-in-organic-in-water droplets

Dong Hyun Yoon*, Kenta Hasegawa, Yuji Kaneko, Takahiro Arakawa, Jeung Sang Go, Tetsushi Sekiguchi, Shuichi Shoji

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This paper presents methods for the formation of hollow microcapsules and microlenses using multiphase microdroplets. Microdroplets, which consist of a gas core and an organic phase shell, were generated at a single junction on a silicon device without surface treatment of the fluidic channels. Droplet, core and shell dimensions were controlled by varying the flow rates of each phase. When the organic solvent was released from the organic phase shell, the environmental conditions changed the shape of the solidified polymer shell to either a hollow capsule or a microlens. A uniform solvent release process produced polymeric capsules with nanoliter gas core volumes and a membrane thickness of approximately 3 μm. Alternatively physical rearrangement of the core and shell allowed for the formation of polymeric microlenses. On-demand formation of the polymer lenses in wells and through-holes polydimethylsiloxane (PDMS) structures was achieved. Optical properties of the lenses were controlled by changing the dimension of these structures.

Original languageEnglish
Pages (from-to)622-633
Number of pages12
Issue number5
Publication statusPublished - 2015


  • Hollow microcapsule
  • Microlens
  • Multiphase microdroplet

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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