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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Published on: June 23, 2017

Janus nematic colloids driven by light.

M Conradi1, M Zorko, I Musevic

  • 1Institute of Metals and Technology, Ljubljana, Slovenia. marjetka.conradi@imt.si

Optics Express
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Janus particles in liquid crystals exhibit distinct director field configurations. Laser manipulation induces irreversible transformations and continuous rotation, offering new possibilities for particle behavior control.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Nematic Liquid Crystals

Background:

  • Janus particles possess distinct surface properties, influencing their interaction with surrounding media.
  • Nematic liquid crystals exhibit anisotropic properties, responding to external fields and particle interfaces.
  • Understanding particle behavior in liquid crystals is crucial for developing novel materials and devices.

Purpose of the Study:

  • To experimentally investigate equilibrium orientations of Janus particles in 5CB nematic liquid crystal.
  • To analyze light-driven transformations of Janus particles under laser manipulation.
  • To characterize director field configurations induced by different Janus particle surface preparations.

Main Methods:

  • Synthesis of Janus particles with homeotropic (DMOAP) and planar (Au) hemispheres.
  • Experimental observation of director field configurations using microscopy.
  • Manipulation of Janus particles with laser tweezers to induce orientational transformations.

Main Results:

  • Two distinct director field configurations were observed: dipolar-like (Au/DMOAP) and boojum-like (DMOAP/Au).
  • Laser manipulation induced irreversible transformations into Saturn-ring and boojum-ring configurations for Au/DMOAP particles.
  • DMOAP/Au particles exhibited continuous rotation around an axis perpendicular to the laser beam, with frequency proportional to laser power.

Conclusions:

  • Janus particle surface chemistry dictates their equilibrium orientation and director field configuration in nematic liquid crystals.
  • Laser tweezers enable controlled, light-driven transformations of Janus particles, leading to novel configurations.
  • The rotational behavior of DMOAP/Au Janus particles suggests potential applications in micro-actuation and optical devices.