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Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Preparation and 3D Tracking of Catalytic Swimming Devices
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Light-activated self-propelled colloids.

J Palacci1, S Sacanna2, S-H Kim3

  • 1Department of Physics, New York University, New York, NY 10003, USA jp153@nyu.edu.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|October 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers created light-activated, self-propelled particles using semiconductor materials. These particles exhibit controlled motion and self-assembly into dynamic

Keywords:
active colloidscolloidal synthesisself-organization

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Colloidal particles typically exhibit random motion due to thermal fluctuations.
  • Controlling particle motion and assembly is crucial for developing advanced materials and micro-devices.
  • Photoelectrochemical properties offer a pathway for light-induced particle actuation.

Purpose of the Study:

  • To synthesize and characterize light-activated self-propelled colloidal particles.
  • To investigate the mechanisms of light-induced propulsion and inter-particle interactions.
  • To demonstrate the formation of dynamic self-assembled structures ('living crystals') driven by light.

Main Methods:

  • Synthesis of semiconductor-based (α-Fe2O3, TiO2) photoactive colloids.
  • Optical microscopy to study particle motion and behavior.
  • Utilizing photoelectrochemical reactions to generate chemical gradients for propulsion and attraction.
  • Applying external magnetic fields for particle steering and analysis of self-assembly dynamics.

Main Results:

  • Particles exhibit light-activated self-propulsion via phoretic and osmotic mechanisms.
  • Demonstrated multiwavelength activation and propulsion capabilities.
  • Observed spontaneous formation of mobile 'living crystals' at sufficient particle densities.
  • Showed that dense phase formation arises from particle collisions, a non-equilibrium phenomenon.

Conclusions:

  • Developed a versatile method for creating light-activated self-propelled particles.
  • The study provides insights into the physics and chemistry governing non-equilibrium colloidal systems.
  • This work presents a novel principle for self-organization and opens routes for designing new active matter systems.