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The Colloidal State01:29

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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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Colloidal particles in blue phase liquid crystals.

Anne C Pawsey1, Paul S Clegg

  • 1SUPA, School of Physics and Astronomy, JCMB, Mayfield Road, Edinburgh, EH9 3JZ, UK. a.pawsey@abdn.ac.uk.

Soft Matter
|February 21, 2015
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Summary
This summary is machine-generated.

Dispersed colloidal particles disrupt chiral nematic liquid crystals, influencing blue phase (BP) transitions. These colloids promote localized melting to the isotropic phase, forming faceted inclusions within the blue phases.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Soft Matter Physics

Background:

  • Chiral nematic liquid crystals exhibit complex phase behavior, including blue phases (BP).
  • Disorder, such as from colloidal particles, can significantly alter phase transitions in liquid crystal systems.
  • Understanding defect-mediated transitions is crucial for developing novel materials and devices.

Purpose of the Study:

  • To investigate the impact of micron-sized colloidal particles on the phase transitions of chiral nematic liquid crystals, specifically focusing on the blue phase.
  • To analyze how these colloids act as defect sites and influence the formation and stability of different blue phases (BPI and BPII).
  • To compare the defect behavior induced by colloids in blue phases versus cholesteric liquid crystals.

Main Methods:

  • Dispersion of micron-sized colloidal particles in chiral nematic liquid crystals.
  • Heating the system through its phase transitions from cholesteric to isotropic, including the blue phase.
  • Microscopic observation and analysis of defect formation and phase evolution.

Main Results:

  • Colloidal particles act as preferential nucleation sites for blue phase I (BPI) growth from the cholesteric phase.
  • Blue phase II (BPII) also forms in high chirality samples due to colloidal influence.
  • In both BPI and BPII, colloids induce localized melting to the isotropic phase, creating faceted isotropic inclusions.

Conclusions:

  • Colloidal defects fundamentally alter blue phase formation and stability in chiral nematic liquid crystals.
  • The localized melting induced by colloids in blue phases contrasts with system-spanning defects observed in cholesteric liquid crystals.
  • These findings highlight the role of disorder in tuning liquid crystal phase transitions and defect structures.