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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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Surface-induced structures in nematic liquid crystal colloids.

S B Chernyshuk1, O M Tovkach2, B I Lev2

  • 1Institute of Physics, NAS of Ukraine, Prospekt Nauky 46, Kyiv 03650, Ukraine.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary

Theoretical predictions reveal novel colloidal structures in nematic liquid crystal (NLC) cells. Surface patterns induce these structures, forming square lattices of quadrupole particles within the NLC cell.

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Area of Science:

  • Colloidal science and soft matter physics.
  • Nematic liquid crystals and their anisotropic properties.
  • Surface science and pattern engineering.

Background:

  • Nematic liquid crystal (NLC) cells confine liquid crystal phases between surfaces.
  • Surface patterns can create non-uniform boundary conditions for director distortions.
  • Colloidal particles with specific director configurations (e.g., boojums, Saturn-ring) exhibit unique interactions.

Purpose of the Study:

  • To theoretically predict the formation of colloidal structures in NLC cells induced by patterned surfaces.
  • To investigate how non-uniform boundary conditions influence bulk structure formation.
  • To demonstrate the self-assembly of quadrupole spherical particles into ordered lattices.

Main Methods:

  • Theoretical modeling of director distortions in NLCs near patterned surfaces.
  • Analysis of boundary conditions imposed by UV-irradiated polyamide surfaces with micron-sized masks.
  • Simulation and prediction of colloidal particle behavior and self-assembly.

Main Results:

  • Prediction of a new class of colloidal structures within NLC cells.
  • Demonstration that patterned surfaces induce bulk structures from non-uniform boundary conditions.
  • Observation that quadrupole spherical particles form a square lattice in planar NLC cells with checkerboard patterned plates.

Conclusions:

  • Surface patterns on NLC cell plates can controllably induce colloidal structures.
  • Quadrupole particles self-assemble into ordered square lattices under specific boundary conditions.
  • This work opens possibilities for designing novel soft matter architectures using patterned NLCs.