---
OA_place: repository
OA_type: green
_id: '19441'
abstract:
- lang: eng
  text: Catalytic microswimmers convert the chemical energy from fuel into motion.
    They sustain chemical gradients and fluid flows that propel them by phoresis.
    This leads to unconventional behavior and collective dynamics, such as self-organization
    into complex structures. Characterizing the nonequilibrium interactions of microswimmers
    is crucial for advancing our understanding of active systems. However, this remains
    a challenge owing to the importance of fluctuations at the microscale and the
    difficulty in disentangling the different contributions to the interactions. Here,
    we show a massive dependence of the nonequilibrium interactions on the shape of
    catalytic microswimmers. We perform tracking experiments at high throughput to
    map interactions between nanocolloidal tracers and dimeric microswimmers of various
    aspect ratios. Our method leverages dual tracers with differing phoretic mobilities
    to quantitatively disentangle phoretic motion from hydrodynamic advection. This
    approach is validated through experiments on single chemically active sites and
    on immobilized catalytic microswimmers. We further investigate the activity-driven
    interactions of free microswimmers and directly measure their phoretic interactions.
    When compared to standard models, our findings highlight the important role of
    osmotic flows for microswimmers near surfaces and reveal an enhanced contribution
    of hydrodynamic advection relative to phoretic motion as the size of the microswimmer
    increases. Our study provides robust measurements of the nonequilibrium interactions
    from catalytic microswimmers and lays the groundwork for a realistic description
    of active systems.
acknowledgement: The authors thank M. Perrin and A. Allard for enlightening discussions.
  This research was funded in whole or in part by the Austrian Science Fund (FWF)
  [10.55776/P35206]. This project has received funding from the European Union’s Horizon
  2020 research and innovation programme under the Marie Sklodowska Curie grant agreement
  No. 886024.
article_processing_charge: No
article_type: original
author:
- first_name: Celso
  full_name: Carrasco, Celso
  last_name: Carrasco
- first_name: Quentin
  full_name: Martinet, Quentin
  id: b37485a8-d343-11eb-a0e9-df8c484ef8ab
  last_name: Martinet
  orcid: 0000-0002-2916-6632
- first_name: Zaiyi
  full_name: Shen, Zaiyi
  last_name: Shen
- first_name: Juho
  full_name: Lintuvuori, Juho
  last_name: Lintuvuori
- first_name: Jérémie A
  full_name: Palacci, Jérémie A
  id: 8fb92548-2b22-11eb-b7c1-a3f0d08d7c7d
  last_name: Palacci
  orcid: 0000-0002-7253-9465
- first_name: Antoine
  full_name: Aubret, Antoine
  last_name: Aubret
citation:
  ama: Carrasco C, Martinet Q, Shen Z, Lintuvuori J, Palacci JA, Aubret A. Characterization
    of nonequilibrium interactions of catalytic microswimmers using phoretically responsive
    nanotracers. <i>ACS Nano</i>. 2025;19(11):11133-11145. doi:<a href="https://doi.org/10.1021/acsnano.4c18078">10.1021/acsnano.4c18078</a>
  apa: Carrasco, C., Martinet, Q., Shen, Z., Lintuvuori, J., Palacci, J. A., &#38;
    Aubret, A. (2025). Characterization of nonequilibrium interactions of catalytic
    microswimmers using phoretically responsive nanotracers. <i>ACS Nano</i>. American
    Chemical Society. <a href="https://doi.org/10.1021/acsnano.4c18078">https://doi.org/10.1021/acsnano.4c18078</a>
  chicago: Carrasco, Celso, Quentin Martinet, Zaiyi Shen, Juho Lintuvuori, Jérémie
    A Palacci, and Antoine Aubret. “Characterization of Nonequilibrium Interactions
    of Catalytic Microswimmers Using Phoretically Responsive Nanotracers.” <i>ACS
    Nano</i>. American Chemical Society, 2025. <a href="https://doi.org/10.1021/acsnano.4c18078">https://doi.org/10.1021/acsnano.4c18078</a>.
  ieee: C. Carrasco, Q. Martinet, Z. Shen, J. Lintuvuori, J. A. Palacci, and A. Aubret,
    “Characterization of nonequilibrium interactions of catalytic microswimmers using
    phoretically responsive nanotracers,” <i>ACS Nano</i>, vol. 19, no. 11. American
    Chemical Society, pp. 11133–11145, 2025.
  ista: Carrasco C, Martinet Q, Shen Z, Lintuvuori J, Palacci JA, Aubret A. 2025.
    Characterization of nonequilibrium interactions of catalytic microswimmers using
    phoretically responsive nanotracers. ACS Nano. 19(11), 11133–11145.
  mla: Carrasco, Celso, et al. “Characterization of Nonequilibrium Interactions of
    Catalytic Microswimmers Using Phoretically Responsive Nanotracers.” <i>ACS Nano</i>,
    vol. 19, no. 11, American Chemical Society, 2025, pp. 11133–45, doi:<a href="https://doi.org/10.1021/acsnano.4c18078">10.1021/acsnano.4c18078</a>.
  short: C. Carrasco, Q. Martinet, Z. Shen, J. Lintuvuori, J.A. Palacci, A. Aubret,
    ACS Nano 19 (2025) 11133–11145.
date_created: 2025-03-23T23:01:26Z
date_published: 2025-03-11T00:00:00Z
date_updated: 2025-10-16T10:26:59Z
day: '11'
department:
- _id: JePa
doi: 10.1021/acsnano.4c18078
external_id:
  isi:
  - '001443359300001'
  pmid:
  - '40069094'
fulldoi: https://doi.org/10.1021/acsnano.4c18078
intvolume: '        19'
isi: 1
issue: '11'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://hal.science/hal-04682818v2
month: '03'
oa: 1
oa_version: Submitted Version
page: 11133-11145
pmid: 1
project:
- _id: eb99c9bb-77a9-11ec-83b8-9f8cffa20a35
  grant_number: P35206
  name: Emergent Behavior in Spinning Active Matter
publication: ACS Nano
publication_identifier:
  eissn:
  - 1936-086X
  issn:
  - 1936-0851
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Characterization of nonequilibrium interactions of catalytic microswimmers
  using phoretically responsive nanotracers
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 19
year: '2025'
...