Visualizing the double-gyroid twin. | Academic Article individual record
abstract

Periodic gyroid network materials have many interesting properties (band gaps, topologically protected modes, superior charge and mass transport, and outstanding mechanical properties) due to the space-group symmetries and their multichannel triply continuous morphology. The three-dimensional structure of a twin boundary in a self-assembled polystyrene-b-polydimethylsiloxane (PS-PDMS) double-gyroid (DG) forming diblock copolymer is directly visualized using dual-beam scanning microscopy. The reconstruction clearly shows that the intermaterial dividing surface (IMDS) is smooth and continuous across the boundary plane as the pairs of chiral PDMS networks suddenly change their handedness. The boundary plane therefore acts as a topological mirror. The morphology of the normally chiral nodes and strut loops within the networks is altered in the twin-boundary plane with the formation of three new types of achiral nodes and the appearance of two new classes of achiral loops. The boundary region shares a very similar surface/volume ratio and distribution of the mean and Gaussian curvatures of the IMDS as the adjacent ordered DG grain regions, suggesting the twin is a low-energy boundary.

authors
publication outlet

Proc Natl Acad Sci U S A

author list (cited authors)
Feng, X., Zhuo, M., Guo, H., & Thomas, E. L.
publication date
2021
keywords
  • Bicontinuous Tubular Network Structure
  • 3d Tomography
  • Twin Boundary
  • Block Copolymer
  • Self-assembly
altmetric score

54.25

citation count

4

PubMed ID
33723049
identifier
548187SE
Digital Object Identifier (DOI)
start page
e2018977118
end page
e2018977118
volume
118
issue
12