Sublimation of isolated toric focal conic domains on micro-patterned surfaces

Wantae Kim, Eduardo Vitral, Perry H. Leo, Jorge Viñals, Dae Seok Kim, Dong Ki Yoon

Research output: Contribution to journalArticlepeer-review


Toric focal conic domains (TFCDs) in smectic liquid crystals exhibit distinct topological characteristics, featuring torus-shaped molecular alignment patterns with rotational symmetry around a central core. TFCDs have attracted much interest due to their unique topological structures and properties, enabling not only fundamental studies but also potential applications in liquid crystal (LC)-based devices. Here, we investigated the precise spatial control of the arrangement of TFCDs using micropatterns and sublimation of TFCDs to estimate the energy states of the torus-like structures. Through simulations, we observed that the arrangement of TFCDs strongly depends on the shape of the topographies of underlying substrates. To accurately estimate the energetic effects of non-zero eccentricity and evaluate their thermodynamic stability, we propose a geometric model. Our findings provide valuable insights into the behavior of smectic LCs, offering opportunities for developing novel LC-based devices with precise control over their topological properties.

Original languageEnglish (US)
Pages (from-to)2040-2051
Number of pages12
JournalSoft Matter
Issue number9
StatePublished - Jan 30 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 The Royal Society of Chemistry.

PubMed: MeSH publication types

  • Journal Article


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