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Partially Bonded Crystals: A Pathway to Porosity and Polymorphism
Carina Karner1, Emanuela Bianchi1,2
1Institut für Theoretische Physik, TU Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria.
ACS Nano
|January 28, 2025
Summary
Anisotropic colloids with deliberately displaced patches form porous crystals. Geometric frustration and partial bonding create chiral units, enabling new crystal structures.
Area of Science:
- Colloid science
- Materials science
- Crystallography
Background:
- Anisotropic colloids with localized bonding sites (patches) self-organize into ordered porous monolayers.
- Previous assumptions required full bonding between patchy particles for crystal formation, with incomplete bonding leading to disorder.
Purpose of the Study:
- To investigate an alternative route to porous crystalline monolayers by disfavoring full bonding.
- To explore the role of geometric frustration and partial bonding in self-assembly.
Main Methods:
- Theoretical and experimental investigations of anisotropic colloids.
- Analysis of particle shape and patch placement effects on self-assembly.
- Characterization of resulting structures and bonding configurations.
Main Results:
- Deliberately displacing patches leads to porous crystalline monolayers, contrary to prior assumptions.
- Geometric frustration and partial bonding are key drivers for this new assembly pathway.
- Dangling bonds emerge, forming effectively chiral units.
Conclusions:
- Porous crystalline monolayers can form even when full inter-particle bonding is disfavored.
- Geometric frustration and partial bonding offer a novel mechanism for designing ordered colloidal materials.
- The emergence of chiral units expands the understanding of self-assembly principles.
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