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Issue 19, 2013
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Microscale separation of immiscible liquids using a porous capillary

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Abstract

We describe a simple method for the direct inline separation of two immiscible liquids based on the selective wetting and permeation of a porous polytetrafluoroethylene capillary by one of the liquids. Using water dispersed in fluorous carrier fluid as a test system, quantitative recovery of the water from the carrier fluid is achieved over a wide range of flow conditions, with no contamination by the fluorous component even when present in large (ten-fold) excess. The exiting water stream may be readily redispersed by injecting additional carrier fluid downstream, allowing for repeated switching between the segmented and continuous flow regimes – a critical requirement for multistep chemical processing. The separator is shown to simplify in-line sample analysis by allowing measurements to be carried out quasi-statically without the need for fast instrumentation synchronised to the segmented water flow.

Graphical abstract: Microscale separation of immiscible liquids using a porous capillary

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Publication details

The article was received on 25 Jul 2013, accepted on 29 Jul 2013 and first published on 19 Aug 2013


Article type: Paper
DOI: 10.1039/C3AY41251B
Citation: Anal. Methods, 2013,5, 4991-4998
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    Microscale separation of immiscible liquids using a porous capillary

    J. H. Bannock, T. W. Phillips, A. M. Nightingale and J. C. deMello, Anal. Methods, 2013, 5, 4991
    DOI: 10.1039/C3AY41251B

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