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Triple Junction at the Triple Point Resolved on the Individual Particle Level.

M Chaudhuri1,2,3, E Allahyarov3,4, H Löwen3

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|January 18, 2018
PubMed
Summary
This summary is machine-generated.

At the repulsive screened Coulomb system

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Area of Science:

  • Colloid science
  • Soft matter physics
  • Crystallization phenomena

Background:

  • Repulsive screened Coulomb systems exhibit complex phase behavior.
  • The coexistence of multiple phases (fcc, bcc, fluid) occurs at a specific triple point.
  • The intersection of these three phases forms a triple junction, a liquid groove.

Purpose of the Study:

  • To resolve the triple junction on a single-particle level.
  • To investigate the structure and properties of the solid-solid interface within the triple junction.
  • To quantitatively determine the fcc-bcc interfacial energy.

Main Methods:

  • Utilized confocal microscopy for high-resolution imaging.
  • Employed a model system of charged polymethyl methacrylate (PMMA) colloids in a nonpolar solvent.
  • Applied Young's equation to calculate interfacial energy.

Main Results:

  • Observed an extremely deep liquid groove forming the triple junction.
  • Found a very broad, incommensurate solid-solid interface.
  • Demonstrated that thermal fluctuations dominate the solid-solid interface, indicating low interfacial energy.
  • Quantified the fcc-bcc interfacial energy, finding it approximately 1.3 times the fcc-fluid interfacial energy near the triple point.

Conclusions:

  • The study provides a single-particle-level understanding of triple junctions in colloidal systems.
  • The broad solid-solid interface and low interfacial energy are attributed to dominant thermal fluctuations.
  • Results offer insights into phase transitions and interfacial phenomena in soft matter.