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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 the...
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Published on: July 18, 2014

Interparticle force between different types of nematic colloids.

Kuniyoshi Izaki1, Yasuyuki Kimura

  • 1Department of Physics, School of Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

We investigated interparticle forces between colloidal particles with defects in liquid crystals. Forces followed electrostatic analogy at large distances but became attractive at short distances due to defect reorientation.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Liquid Crystal Physics

Background:

  • Colloidal particles in liquid crystals exhibit complex interactions.
  • Defects in liquid crystals, such as dipole (D), Saturn-ring (S), and planar (P) types, significantly influence interparticle forces.
  • Understanding these forces is crucial for applications in materials science and nanotechnology.

Purpose of the Study:

  • To experimentally measure and analyze the interparticle forces between different types of defect colloidal particles in a nematic liquid crystal.
  • To compare experimental results with theoretical predictions, particularly the electrostatic analogy.
  • To investigate the influence of particle arrangement and defect reorientation on interparticle forces.

Main Methods:

  • Utilized dual-beam optical tweezers to precisely control and measure forces between colloidal particles.
  • Studied interactions between dipole-Saturn-ring, dipole-planar, and Saturn-ring-planar particle pairs.
  • Analyzed force profiles at varying interparticle distances and in oblique arrangements relative to the far-field director.

Main Results:

  • Interparticle forces at large distances (R) were found to be proportional to R raised to powers between -4.95 and -5.78, consistent with electrostatic analogy predictions.
  • Topological quadrupole moments for Saturn-ring and planar particles were determined from experimental data.
  • At small interparticle distances, forces universally became attractive due to defect reorientation and deformation, deviating from simple electrostatic predictions.

Conclusions:

  • The study confirms the applicability of electrostatic analogy for describing interparticle forces between defect colloidal particles in liquid crystals at large separations.
  • Experimental force curves quantitatively agree with theoretical predictions at large R but show attractive behavior at small R.
  • Defect reorientation and deformation play a critical role in modifying interparticle interactions at close range, highlighting the complexity of colloidal systems in liquid crystals.