Understanding enhanced rotational dynamics of active probes in rod suspensions

N Narinder; M F Bos; C Abaurrea-Velasco; J de Graaf; C Bechinger

doi:10.1039/d2sm00583b

Understanding enhanced rotational dynamics of active probes in rod suspensions

N Narinder
, M F Bos
, C Abaurrea-Velasco
, J de Graaf
, C Bechinger

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

Abstract

Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.

Original language	English
Pages (from-to)	6246-6253
Number of pages	8
Journal	Soft Matter
Volume	18
Issue number	33
DOIs	https://doi.org/10.1039/d2sm00583b
Publication status	Published - 5 Aug 2022

Bibliographical note

Funding Information:
C. B. acknowledges financial support by the ERC Advanced Grant ASCIR (Grant No. 693683) and by the German Research Foundation (DFG), Grant No. SFB 1432 (ID 425217212). J. d. G. acknowledges NWO for funding through Start-Up Grant 740.018.013. We are grateful to Shuvojit Paul for useful discussions. Open data package containing the means to reproduce the results of the simulations available at: https://doi.org/10.24416/UU01-GJTRTM.

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

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title = "Understanding enhanced rotational dynamics of active probes in rod suspensions",

abstract = "Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.",

author = "N Narinder and Bos, \{M F\} and C Abaurrea-Velasco and \{de Graaf\}, J and C Bechinger",

note = "Funding Information: C. B. acknowledges financial support by the ERC Advanced Grant ASCIR (Grant No. 693683) and by the German Research Foundation (DFG), Grant No. SFB 1432 (ID 425217212). J. d. G. acknowledges NWO for funding through Start-Up Grant 740.018.013. We are grateful to Shuvojit Paul for useful discussions. Open data package containing the means to reproduce the results of the simulations available at: https://doi.org/10.24416/UU01-GJTRTM. Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry.",

year = "2022",

month = aug,

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doi = "10.1039/d2sm00583b",

language = "English",

volume = "18",

pages = "6246--6253",

journal = "Soft Matter",

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TY - JOUR

T1 - Understanding enhanced rotational dynamics of active probes in rod suspensions

AU - Narinder, N

AU - Bos, M F

AU - Abaurrea-Velasco, C

AU - de Graaf, J

AU - Bechinger, C

N1 - Funding Information: C. B. acknowledges financial support by the ERC Advanced Grant ASCIR (Grant No. 693683) and by the German Research Foundation (DFG), Grant No. SFB 1432 (ID 425217212). J. d. G. acknowledges NWO for funding through Start-Up Grant 740.018.013. We are grateful to Shuvojit Paul for useful discussions. Open data package containing the means to reproduce the results of the simulations available at: https://doi.org/10.24416/UU01-GJTRTM. Publisher Copyright: © 2022 The Royal Society of Chemistry.

PY - 2022/8/5

Y1 - 2022/8/5

N2 - Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.

AB - Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.

UR - https://www.scopus.com/pages/publications/85136218976

U2 - 10.1039/d2sm00583b

DO - 10.1039/d2sm00583b

M3 - Article

C2 - 35946318

SN - 1744-683X

VL - 18

SP - 6246

EP - 6253

JO - Soft Matter

JF - Soft Matter

IS - 33

ER -

Understanding enhanced rotational dynamics of active probes in rod suspensions

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