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Diffusiophoretic exclusion of colloidal particles for continuous water purification

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Abstract

It has been observed that colloidal particles are anomalously repelled from the interface of nanoporous materials and water by up to hundreds of micrometers even if there is no additional external field present. Recently, the physical origin of this anomalous repulsion has turned out to be diffusiophoretic migration triggered by an ion exchange process through the interface. Since the repulsive force is induced by a salt gradient only, the phenomenon can be applied to a microscale water purification platform without the need for any external power sources. In this work, we suggest a micro/nanofluidic device for continuous water purification utilizing 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 have theoretically and experimentally demonstrated that long-range diffusiophoretic exclusion can be used for continuous water purification. Finally, our platform can be used as a highly energy-efficient and portable water treatment option for operations such as purification, disinfection, water softening, etc.

Graphical abstract: Diffusiophoretic exclusion of colloidal particles for continuous water purification

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C8LC00132D

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