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Bacteria Delay the Jamming of Particles at Microchannel Bottlenecks

Sendekie, Zenamarkos Bantie and Gaveau, Arthur and Lammertink, Rob and Bacchin, Patrice Bacteria Delay the Jamming of Particles at Microchannel Bottlenecks. (2016) Scientific Reports, vol. 6 (n° 31471). pp. 1-10. ISSN 2045-2322

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Official URL: http://dx.doi.org/10.1038/srep31471

Abstract

Clogging of channels by complex systems such as mixtures of colloidal and biological particles is commonly encountered in different applications. In this work, we analyze and compare the clogging mechanisms and dynamics by pure and mixture suspensions of polystyrene latex particles and Escherichia coli by coupling fluorescent microscopic observation and dynamic permeability measurements in microfluidic filters. Pure particles filtration leads to arches and deposit formation in the upstream side of the microfilter while pure bacteria form streamers in the downstream zone. When mixing particle and bacteria, an unexpected phenomenon occurs: the clogging dynamics is significantly delayed. This phenomenon is related to apparent “slippery” interactions between the particles and the bacteria. These interactions limit the arches formation at the channels entrances and favour the formation of dendritic structures on the pillars between the channels. When these dendrites are eroded by the flow, fragments of the deposit are dragged towards the channels entrances. However, these bacteria/particles clusters being lubricated by the slippery interactions are deformed and stretched by the shear thus facilitating their passage through the microchannels.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group editor. The definitive version is available at http://www.nature.com/ The original PDF of the article can be found at Scientific Reports website : http://www.nature.com/scientificreports
HAL Id:hal-01360015
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > University of Twente (NETHERLANDS)
Laboratory name:
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Deposited By: Patrice Bacchin
Deposited On:30 Aug 2016 12:58

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