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Diffusiophoretic Exclusion of Colloidal Particles for Continuous Water Purification

Abstract

It has been observed that colloidal particles are anomalously repelled from the interface of nanoporous material and water up to hundreds of micrometers even if there is no additional external field. Recently, the physical origin of the anomalous repulsion turned out to be diffusiophoretic migration triggered by ion exchange process through the interface. Since the repulsive force is induced by salt gradient only, the phenomenon can be applied to a microscale water purification platform without any external power sources. In this work, we suggested a micro/nanofluidic device for continuous water purification utilizing the long-range diffusiophoretic migration around ion exchangeable surfaces. An ion concentration boundary layer was characterized by the Sherwood number (Sh) which is a key dimensionless number to describe the purification process. Depending on Sh, we theoretically and experimentally demonstrated that the long-range diffusiophoretic exclusion can be applicable to the continuous water purification. Conclusively, our platform would be commensurated with the high energy-efficient and portable water treatment operations such as purification, disinfection, water softening, etc.

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Publication details

The article was received on 02 Feb 2018, accepted on 04 May 2018 and first published on 04 May 2018


Article type: Paper
DOI: 10.1039/C8LC00132D
Citation: Lab Chip, 2018, Accepted Manuscript
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    Diffusiophoretic Exclusion of Colloidal Particles for Continuous Water Purification

    H. Lee, J. Kim, J. Yang, S. W. Seo and S. J. Kim, Lab Chip, 2018, Accepted Manuscript , DOI: 10.1039/C8LC00132D

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