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Multi-Step Crystallization of Self-Organized Spiral Eutectics.

Saman Moniri1, Hrishikesh Bale2, Tobias Volkenandt3

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|January 24, 2020
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Summary
This summary is machine-generated.

Researchers discovered a new spiral self-organization method for metallic alloys, enabling the creation of large-area chiral patterns. This defect-mediated growth pathway offers a novel approach for synthesizing advanced chiral materials.

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chiralitycrystallizationself-organizationspiral eutectics

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Area of Science:

  • Materials Science
  • Crystallography
  • Condensed Matter Physics

Background:

  • Metallic alloys can exhibit complex solidification behaviors.
  • Chiral materials possess unique structural and optical properties.
  • Understanding crystallization mechanisms is crucial for material design.

Purpose of the Study:

  • To present a new method for producing large-area chiral patterns in metallic alloys.
  • To investigate the underlying mechanism and dynamics of spiral self-organization during solidification.
  • To explore the potential for bottom-up synthesis of novel chiral materials.

Main Methods:

  • Investigated the solidification of metallic alloys using spiral self-organization.
  • Analyzed a newly discovered growth mode for metastable, two-phase spiral patterns.
  • Examined the non-classical, two-step crystallization pathway involving polytetrahedral seed crystals.
  • Identified the role of crystallographic defects in templating spiral self-organization.

Main Results:

  • Discovered a new growth mode for metastable, two-phase spiral patterns in liquid metals.
  • Identified a two-step crystallization process: polytetrahedral seed formation followed by heterogeneous nucleation and coupled growth of two solid phases.
  • Demonstrated that crystallographic defects within the seed act as templates for spiral self-organization.
  • Established a pathway for bottom-up synthesis of chiral materials with inter-phase spacing near infrared wavelengths.

Conclusions:

  • Defect-mediated growth is a ubiquitous phenomenon in multi-phase materials.
  • The discovered method provides a pathway for synthesizing chiral materials with tunable properties.
  • The findings are applicable to various systems undergoing multi-step crystallization, leveraging inherent short-range order in liquids.