A combined rheometry and imaging study of viscosity reduction in bacterial suspensions

Vincent Arnaud Martinez; Eric Clement; Jochen Arlt; Carine Douarche; Angela Dawson; Jana Schwarz-Linek; Adama K Creppy; Viktor Skultety; Alexander Morozov; Harold Auradou; Wilson Poon

doi:10.1073/pnas.1912690117

A combined rheometry and imaging study of viscosity reduction in bacterial suspensions

Vincent Arnaud Martinez, Eric Clement, Jochen Arlt, Carine Douarche, Angela Dawson, Jana Schwarz-Linek, Adama K Creppy, Viktor Skultety, Alexander Morozov, Harold Auradou, Wilson Poon

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

Suspending self-propelled ‘pushers’ in a liquid lowers its viscosity.
We study how this phenomenon depends on system size in bacterial
suspensions using bulk rheometry and particle-tracking rheoimaging.
Above the critical bacterial volume fraction needed to decrease
the viscosity to zero, c 0.75%, large-scale collective motion
emerges in the quiescent state and the flow becomes non-linear. We
confirm a theoretical prediction that such instability should be suppressed
by confinement. Our results also show that a recent application
of active liquid crystal theory to such systems is untenable.

Original language	English
Pages (from-to)	2326-2331
Journal	Proceedings of the National Academy of Sciences (PNAS)
Volume	117
Issue number	5
DOIs	https://doi.org/10.1073/pnas.1912690117
Publication status	Published - 21 Jan 2020

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10.1073/pnas.1912690117Licence: Creative Commons: Attribution (CC-BY)

v11_PNASAccepted author manuscript, 1.24 MBLicence: Creative Commons: Attribution (CC-BY)

https://www.pnas.org/content/early/2020/01/17/1912690117/tab-article-infoLicence: Creative Commons: Attribution (CC-BY)

Macroscopic and Microscopic properties of active matter
Martinez, V. A.
UK-based charities
15/03/17 → 14/03/19
Project: Research
PHYSAPS: The Physics of Active Particle Suspensions
Poon, W.
EU government bodies
1/02/14 → 31/01/20
Project: Research
ESMI
Arlt, J.
EU government bodies
1/01/11 → 31/12/15
Project: Research

Dataset for: "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions"
Martinez, V. A. (Creator), Clement, E. (Creator), Arlt, J. (Creator), Douarche, C. (Creator), Dawson, A. (Creator), Schwarz-Linek, J. (Creator), Creppy, A. (Creator), Skultety, V. (Creator), Morozov, A. (Creator), Auradou, H. (Creator) & Poon, W. (Creator), Edinburgh DataShare, 8 Jan 2020
DOI: 10.7488/ds/2748
Dataset

Vincent Arnaud Martinez
- School of Physics and Astronomy - UoE Honorary staff
Person: Affiliated Independent Researcher

Cite this

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title = "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions",

abstract = "Suspending self-propelled {\textquoteleft}pushers{\textquoteright} in a liquid lowers its viscosity.We study how this phenomenon depends on system size in bacterialsuspensions using bulk rheometry and particle-tracking rheoimaging.Above the critical bacterial volume fraction needed to decreasethe viscosity to zero, c 0.75%, large-scale collective motionemerges in the quiescent state and the flow becomes non-linear. Weconfirm a theoretical prediction that such instability should be suppressedby confinement. Our results also show that a recent applicationof active liquid crystal theory to such systems is untenable.",

author = "Martinez, {Vincent Arnaud} and Eric Clement and Jochen Arlt and Carine Douarche and Angela Dawson and Jana Schwarz-Linek and Creppy, {Adama K} and Viktor Skultety and Alexander Morozov and Harold Auradou and Wilson Poon",

year = "2020",

month = jan,

day = "21",

doi = "10.1073/pnas.1912690117",

language = "English",

volume = "117",

pages = "2326--2331",

journal = "Proceedings of the National Academy of Sciences (PNAS)",

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TY - JOUR

T1 - A combined rheometry and imaging study of viscosity reduction in bacterial suspensions

AU - Martinez, Vincent Arnaud

AU - Clement, Eric

AU - Arlt, Jochen

AU - Douarche, Carine

AU - Dawson, Angela

AU - Schwarz-Linek, Jana

AU - Creppy, Adama K

AU - Skultety, Viktor

AU - Morozov, Alexander

AU - Auradou, Harold

AU - Poon, Wilson

PY - 2020/1/21

Y1 - 2020/1/21

N2 - Suspending self-propelled ‘pushers’ in a liquid lowers its viscosity.We study how this phenomenon depends on system size in bacterialsuspensions using bulk rheometry and particle-tracking rheoimaging.Above the critical bacterial volume fraction needed to decreasethe viscosity to zero, c 0.75%, large-scale collective motionemerges in the quiescent state and the flow becomes non-linear. Weconfirm a theoretical prediction that such instability should be suppressedby confinement. Our results also show that a recent applicationof active liquid crystal theory to such systems is untenable.

AB - Suspending self-propelled ‘pushers’ in a liquid lowers its viscosity.We study how this phenomenon depends on system size in bacterialsuspensions using bulk rheometry and particle-tracking rheoimaging.Above the critical bacterial volume fraction needed to decreasethe viscosity to zero, c 0.75%, large-scale collective motionemerges in the quiescent state and the flow becomes non-linear. Weconfirm a theoretical prediction that such instability should be suppressedby confinement. Our results also show that a recent applicationof active liquid crystal theory to such systems is untenable.

U2 - 10.1073/pnas.1912690117

DO - 10.1073/pnas.1912690117

M3 - Article

SN - 0027-8424

VL - 117

SP - 2326

EP - 2331

JO - Proceedings of the National Academy of Sciences (PNAS)

JF - Proceedings of the National Academy of Sciences (PNAS)

IS - 5

ER -

A combined rheometry and imaging study of viscosity reduction in bacterial suspensions

Abstract / Description of output

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Projects

Macroscopic and Microscopic properties of active matter

PHYSAPS: The Physics of Active Particle Suspensions

ESMI

Datasets

Dataset for: "A combined rheometry and imaging study of viscosity reduction in bacterial suspensions"

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Vincent Arnaud Martinez

Cite this