University of Hawaii at Manoa

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A Trace Amount of Surfactants Enables Diffusiophoretic Swimming of Bacteria
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Abstract

From birth to health, surfactants play an essential role in our lives. Due to the importance, their environmental impacts are well understood. One of the aspects that has been extensively studied is their impact on bacteria, particularly on their motility. Here, we uncover an alternate chemotactic strategy triggered by surfactants—diffusiophoresis. We show that even a trace amount of ionic surfactants, down to a single ppm level, can promote the bacterial diffusiophoresis by boosting the surface charge of the cells. Because diffusiophoresis is driven by the surface–solute interactions, surfactant-enhanced diffusiophoresis is observed regardless of the types of bacteria. Whether Gram-positive or -negative, flagellated or nonflagellated, the surfactants enable fast migration of freely suspended bacteria, suggesting a ubiquitous locomotion mechanism that has been largely overlooked. We also demonstrate the implication of surfactant-enhanced bacterial diffusiophoresis on the rapid formation of biofilms in flow networks, suggesting environmental and biomedical implications.

KEYWORDS: bacteria, surfactants, diffusiophoresis, surface charge, biofilms

주소복사
논문정보   
- 형식: Research article
- 게재일: 2020년 10월 (BRIC 등록일 2020-10-16)
- 연구진: 국외연구진
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