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Related Experiment Videos

Quantifying disorder in colloidal films spin-coated onto patterned substrates.

Raheema Aslam1, Sergio Ardanza-Trevijano1,2, Kristin M Poduska3

  • 1Universidad de Navarra, Complex Systems Group, Pamplona E-31008, Spain.

Physical Review. E
|April 19, 2017
PubMed
Summary

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Researchers developed methods to quantify order in disordered colloidal deposits. By analyzing particle centers using persistent homology, they captured essential information, offering a new way to characterize complex structures.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Applied Mathematics

Background:

  • Thin colloidal deposits created by spin-coating exhibit local symmetries but lack true long-range order due to axial symmetry.
  • Orientationally Correlated Polycrystals (OCPs) are formed, limiting their utility in applications requiring high degrees of order.

Purpose of the Study:

  • To break the axial symmetry of spin-coated colloidal deposits and achieve true long-range order.
  • To develop and apply symmetry-independent methods for quantifying order in disordered colloidal systems.

Main Methods:

  • Introducing patterned surface topography to break the inherent axial symmetry of spin-coated colloidal films.
  • Utilizing persistent homology analysis on particle center data to quantify structural order.

Related Experiment Videos

  • Comparing persistent homology results with traditional bond-orientational order parameters.

    • Main Results:

    • Breaking axial symmetry via patterned surfaces successfully eliminated the OCP character, enabling the study of disordered structures.
    • Persistent homology analysis effectively captured all relevant information from bond-orientational order parameters.
    • The developed methods provide a robust way to characterize order in systems lacking traditional symmetry.

    Conclusions:

    • Persistent homology offers a powerful, symmetry-independent approach for quantifying order in disordered colloidal systems.
    • This methodology can be extended to analyze and characterize other complex, disordered materials and structures.
    • The findings pave the way for improved control and characterization of materials with tailored structural properties.