Flow-induced synthesis of polystyrene-block-poly(ethylene glycol) vesicles on the interface of a laminated microflow

Xuan Don Nguyen, Hyeong Jin Jeon, Dong Hyeok Park, June Huh, Jeung Sang Go

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This paper presents a microfluidic synthesis of polymeric vesicles (PVs) by employing flow-induced self-assembly of polystyrene-block-poly(ethylene glycol) (PS-b-PEG) in a double flow-focusing microchannel (DFFM). The DFFM can solve the limitation of a large size distribution of produced PVs caused by clogging issues in general microchannel synthesis. By adding an attenuation layer between the polymer-dissolved solution and water, it is determined that rapid self-assembly of the polymers can be controlled. The hollow PVs are synthesized with a narrow size distribution and the size controllability is also examined for the ratios of the inlet flow rates and the polymer concentration. The produced PVs are characterized by using transmission electron microscopy, scanning electron microscopy and dynamic light scattering. It is newly visualized that the self-assembly occurs mostly in the attenuation layer owing to the diffusion through the interfaces of the five parallel laminar flow formed in the DFFM. This finding can provide a significant clue to understand the inflow-induced synthesis of the PVs in microchannels. Also, the uniform PVs can be applied to the development of drugs and biomedical researches.

Original languageEnglish
Article number045003
JournalJournal of Micromechanics and Microengineering
Issue number4
Publication statusPublished - 2019 Feb 14


  • double flow-focusing microchannel
  • flow-induced
  • hollow nanoparticles
  • self-assembly

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Flow-induced synthesis of polystyrene-block-poly(ethylene glycol) vesicles on the interface of a laminated microflow'. Together they form a unique fingerprint.

Cite this