---
_id: '9166'
abstract:
- lang: eng
  text: Light-activated self-propelled colloids are synthesized and their active motion
    is studied using optical microscopy. We propose a versatile route using different
    photoactive materials, and demonstrate a multiwavelength activation and propulsion.
    Thanks to the photoelectrochemical properties of two semiconductor materials (α-Fe2O3
    and TiO2), a light with an energy higher than the bandgap triggers the reaction
    of decomposition of hydrogen peroxide and produces a chemical cloud around the
    particle. It induces a phoretic attraction with neighbouring colloids as well
    as an osmotic self-propulsion of the particle on the substrate. We use these mechanisms
    to form colloidal cargos as well as self-propelled particles where the light-activated
    component is embedded into a dielectric sphere. The particles are self-propelled
    along a direction otherwise randomized by thermal fluctuations, and exhibit a
    persistent random walk. For sufficient surface density, the particles spontaneously
    form ‘living crystals’ which are mobile, break apart and reform. Steering the
    particle with an external magnetic field, we show that the formation of the dense
    phase results from the collisions heads-on of the particles. This effect is intrinsically
    non-equilibrium and a novel principle of organization for systems without detailed
    balance. Engineering families of particles self-propelled by different wavelength
    demonstrate a good understanding of both the physics and the chemistry behind
    the system and points to a general route for designing new families of self-propelled
    particles.
article_number: '20130372'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- 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: S.
  full_name: Sacanna, S.
  last_name: Sacanna
- first_name: S.-H.
  full_name: Kim, S.-H.
  last_name: Kim
- first_name: G.-R.
  full_name: Yi, G.-R.
  last_name: Yi
- first_name: D. J.
  full_name: Pine, D. J.
  last_name: Pine
- first_name: P. M.
  full_name: Chaikin, P. M.
  last_name: Chaikin
citation:
  ama: 'Palacci JA, Sacanna S, Kim S-H, Yi G-R, Pine DJ, Chaikin PM. Light-activated
    self-propelled colloids. <i>Philosophical Transactions of the Royal Society A:
    Mathematical, Physical and Engineering Sciences</i>. 2014;372(2029). doi:<a href="https://doi.org/10.1098/rsta.2013.0372">10.1098/rsta.2013.0372</a>'
  apa: 'Palacci, J. A., Sacanna, S., Kim, S.-H., Yi, G.-R., Pine, D. J., &#38; Chaikin,
    P. M. (2014). Light-activated self-propelled colloids. <i>Philosophical Transactions
    of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>. The
    Royal Society. <a href="https://doi.org/10.1098/rsta.2013.0372">https://doi.org/10.1098/rsta.2013.0372</a>'
  chicago: 'Palacci, Jérémie A, S. Sacanna, S.-H. Kim, G.-R. Yi, D. J. Pine, and P.
    M. Chaikin. “Light-Activated Self-Propelled Colloids.” <i>Philosophical Transactions
    of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>. The
    Royal Society, 2014. <a href="https://doi.org/10.1098/rsta.2013.0372">https://doi.org/10.1098/rsta.2013.0372</a>.'
  ieee: 'J. A. Palacci, S. Sacanna, S.-H. Kim, G.-R. Yi, D. J. Pine, and P. M. Chaikin,
    “Light-activated self-propelled colloids,” <i>Philosophical Transactions of the
    Royal Society A: Mathematical, Physical and Engineering Sciences</i>, vol. 372,
    no. 2029. The Royal Society, 2014.'
  ista: 'Palacci JA, Sacanna S, Kim S-H, Yi G-R, Pine DJ, Chaikin PM. 2014. Light-activated
    self-propelled colloids. Philosophical Transactions of the Royal Society A: Mathematical,
    Physical and Engineering Sciences. 372(2029), 20130372.'
  mla: 'Palacci, Jérémie A., et al. “Light-Activated Self-Propelled Colloids.” <i>Philosophical
    Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>,
    vol. 372, no. 2029, 20130372, The Royal Society, 2014, doi:<a href="https://doi.org/10.1098/rsta.2013.0372">10.1098/rsta.2013.0372</a>.'
  short: 'J.A. Palacci, S. Sacanna, S.-H. Kim, G.-R. Yi, D.J. Pine, P.M. Chaikin,
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and
    Engineering Sciences 372 (2014).'
date_created: 2021-02-18T14:31:11Z
date_published: 2014-11-28T00:00:00Z
date_updated: 2021-02-22T10:44:16Z
day: '28'
doi: 10.1098/rsta.2013.0372
extern: '1'
external_id:
  arxiv:
  - '1410.7278'
  pmid:
  - '25332383'
intvolume: '       372'
issue: '2029'
keyword:
- General Engineering
- General Physics and Astronomy
- General Mathematics
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1098/rsta.2013.0372
month: '11'
oa: 1
oa_version: Published Version
pmid: 1
publication: 'Philosophical Transactions of the Royal Society A: Mathematical, Physical
  and Engineering Sciences'
publication_identifier:
  eissn:
  - 1471-2962
  issn:
  - 1364-503X
publication_status: published
publisher: The Royal Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Light-activated self-propelled colloids
type: journal_article
user_id: D865714E-FA4E-11E9-B85B-F5C5E5697425
volume: 372
year: '2014'
...