Highly Ordered Eutectic Mesostructures via Template-Directed Solidification within Thermally Engineered Templates

Sung Bum Kang, Guanglong Huang, Gaurav Singhal, Dajie Xie, Daniel H. Hsieh, Youngmun Lee, Ashish A. Kulkarni, John W. Smith, Qian Chen, Katsuyo Thornton, Sanjiv Sinha, Paul V. Braun

Research output: Contribution to journalArticlepeer-review


Template-directed self-assembly of solidifying eutectics results in emergence of unique microstructures due to diffusion constraints and thermal gradients imposed by the template. Here, the importance of selecting the template material based on its conductivity to control heat transfer between the template and the solidifying eutectic, and thus the thermal gradients near the solidification front, is demonstrated. Simulations elucidate the relationship between the thermal properties of the eutectic and template and the resultant microstructure. The overarching finding is that templates with low thermal conductivities are generally advantageous for forming highly organized microstructures. When electrochemically porosified silicon pillars (thermal conductivity < 0.3 Wm−1K−1) are used as the template into which an AgCl-KCl eutectic is solidified, 99% of the unit cells in the solidified structure exhibit the same pattern. In contrast, when higher thermal conductivity crystalline silicon pillars (≈100 Wm−1K−1) are utilized, the expected pattern is only present in 50% of the unit cells. The thermally engineered template results in mesostructures with tunable optical properties and reflectances nearly identical to the simulated reflectances of perfect structures, indicating highly ordered patterns are formed over large areas. This work highlights the importance of controlling heat flows in template-directed self-assembly of eutectics.

Original languageEnglish (US)
Article number2308720
JournalAdvanced Materials
Issue number15
StatePublished - Apr 11 2024


  • complex mesostructures
  • eutectic solidification
  • photonics
  • template-directed self-assembly
  • thermal engineering

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Highly Ordered Eutectic Mesostructures via Template-Directed Solidification within Thermally Engineered Templates'. Together they form a unique fingerprint.

Cite this