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

Autor: Kang SB; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA., Huang G; Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA., Singhal G; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA., Xie D; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA., Hsieh DH; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, 61801, USA., Lee Y; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, 61801, USA., Kulkarni AA; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA., Smith JW; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA., Chen Q; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA.; Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL, 61801, USA.; Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA.; Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, IL, 61801, USA., Thornton K; Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA., Sinha S; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, 61801, USA., Braun PV; Department of Materials Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Materials Research Laboratory, University of Illinois, Urbana, IL, 61801, USA.; Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL, 61801, USA.; Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL, 61801, USA.; Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA.; Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, IL, 61801, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Apr; Vol. 36 (15), pp. e2308720. Date of Electronic Publication: 2024 Jan 12.
DOI: 10.1002/adma.202308720
Abstrakt: 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 -1 K -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 -1 K -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.
(© 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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