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Soft, malleable double diamond twin.

Xueyan Feng1,2, Michael S Dimitriyev3, Edwin L Thomas1

  • 1Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843.

Proceedings of the National Academy of Sciences of the United States of America
|January 17, 2023
PubMed
Summary
This summary is machine-generated.

We discovered a twin boundary in block copolymer crystals with a double diamond structure. This defect mimics atomic diamond twins, showing soft matter

Keywords:
3D reconstructionmesoatomself assemblysoft mattertwin

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Area of Science:

  • Soft matter physics
  • Crystallography
  • Materials science

Background:

  • Twin boundaries (TBs) are common low-energy planar defects in crystals.
  • Atomic diamond structures (e.g., C, Si, Ge) exhibit TBs with specific symmetries.
  • Block copolymers (BCPs) can self-assemble into complex supramolecular structures.

Purpose of the Study:

  • To investigate twin boundaries in self-assembled block copolymer (BCP) supramolecular crystals.
  • To analyze the structure and symmetry of TBs in the double diamond (DD) BCP system.
  • To compare the TBs in DD BCPs with those in atomic diamond structures.

Main Methods:

  • Studied twins in a self-assembled soft matter block copolymer (BCP) supramolecular crystal with a double diamond (DD) structure.
  • Analyzed the geometry and symmetry of the twin boundary and the restructuring of the minority block network.
  • Compared the structural features of the DD twin boundary with those of a (111) twin in atomic diamond.

Main Results:

  • Identified a coherent, low-energy, mirror-symmetric twin boundary in the DD BCP structure.
  • Observed that one minority block network mirrors atomic diamond (111) twins in geometry and symmetry.
  • The second network undergoes significant restructuring, forming alternating pentahedral and trihedral nodes into a hexagonal mesh at the TB plane.

Conclusions:

  • The study reveals a remarkable analogy between TBs in soft matter BCPs and atomic crystals.
  • The observed restructuring highlights the hierarchical organization and malleability of self-assembled BCP phases.
  • This provides insights into defect formation and structural adaptability in soft materials.