Contactless mass transfer for intra-droplet extraction

Shusaku Asano, Yu Takahashi, Taisuke Maki, Yosuke Muranaka, Nikolay Cherkasov, Kazuhiro Mae

研究成果: Contribution to journalArticle


This study demonstrates the possibility of “contactless” mass transfer between two aqueous slugs (droplets) separated by an oil slug in Taylor flow inside milli-channels. Separation of the alternating aqueous slugs at the outlet was performed by switching a couple of solenoid valves at branched outlets according to signals obtained by an optical sensor at the branch. Transfer of bromothymol blue (BTB) from acidic to basic aqueous slugs was performed for demonstration. In some cases, aqueous slugs separated by oil, merged catching on each other due to the velocity difference. Interfacial tension which was affected by the solute concentration was responsible for the velocity difference. Position-specific mass transfer activity at the rear end of the aqueous slugs was found on the course of the experiment. A meandering channel decreased the velocity difference and enhanced mass transfer. Almost complete (93%) transfer of BTB was achieved within a short residence time of several minutes under optimized conditions. The presented system opens a way for advanced separation using minimum amounts of the oil phase and allows concentrating the solute by altering relative lengths of the sender and receiver slugs.

ジャーナルScientific reports
出版物ステータス出版済み - 12 1 2020

All Science Journal Classification (ASJC) codes

  • General

フィンガープリント Contactless mass transfer for intra-droplet extraction' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用

    Asano, S., Takahashi, Y., Maki, T., Muranaka, Y., Cherkasov, N., & Mae, K. (2020). Contactless mass transfer for intra-droplet extraction. Scientific reports, 10(1), [7685].