Chemical imaging of ion diffusion in a microfluidic channel

K. Miyamoto, H. Ichimura, T. Wagner, T. Yoshinobu, M. J. Schöning

Research output: Contribution to journalConference articlepeer-review


The chemical imaging sensor is a chemical sensor which is capable of visualizing the spatial distribution of chemical species in sample solution. In this study, a novel measurement system based on the chemical imaging sensor was developed to observe the inside of a Y-shaped microfluidic channel while injecting two sample solutions from two branches. From the collected chemical images, it was clearly observed that the injected solutions formed laminar flows in the microfluidic channel. In addition, ion diffusion across the laminar flows was observed. This label-free method can acquire quantitative data of ion distribution and diffusion in microfluidic devices, which can be used to determine the diffusion coefficients, and therefore, the molecular weights of chemical species in the sample solution.

Original languageEnglish
Pages (from-to)886-889
Number of pages4
JournalProcedia Engineering
Publication statusPublished - 2012
Event26th European Conference on Solid-State Transducers, EUROSENSOR 2012 - Krakow, Poland
Duration: 2012 Sept 92012 Sept 12


  • Chemical imaging sensor
  • Laminar flow
  • Microfluidic channel


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