Generation of droplets with different concentrations using gradient-microfluidic droplet generator

Chia Hsien Yeh, Ying Chieh Chen, Yu Cheng Lin

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


This study successfully uses the micro-mixers and flow-focusing devices, which are integrated into a gradient-microfluidic droplet generator, to generate the different sizes of the droplets with different concentrations simultaneously and applies these microcapsules for drug release. The sizes of these four types of droplet with different concentrations are uniformity with a coefficient of variation less than 5% and can be precisely controlled by adjusting the water phase flow rate and oil phase flow rate. Moreover, Ca-alginate microcapsules with different concentrations of the bovine serum albumin are used for uniform size drug release, and the Ca-alginate microcapsule size is from 60 to 105 μm in diameter. This developed microfluidic chip has the advantages of actively controlling the droplet diameter, simultaneously generating uniformsized droplets with different concentrations, and having a simple process and a high throughput. This preparation approach for Ca-alginate microcapsules of four different concentrations will provide many potential applications for drug delivery and pharmaceutical area.

Original languageEnglish
Pages (from-to)245-253
Number of pages9
JournalMicrofluidics and Nanofluidics
Issue number3
Publication statusPublished - 2011 Sep

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry


Dive into the research topics of 'Generation of droplets with different concentrations using gradient-microfluidic droplet generator'. Together they form a unique fingerprint.

Cite this