Layer-by-layer assembly of patchy particles as a route to nontrivial structures

Area of Science:

• Materials Science and Nanotechnology
• Computational Chemistry and Physics
• Biomolecular Engineering

Background:

• Achieving high-quality self-assembly of complex structures from building blocks like patchy particles remains a significant challenge.
• Existing methods often struggle with controlling specificity and preventing the formation of undesired aggregates.
• The precise arrangement of particles is crucial for creating functional nanomaterials and advanced crystalline structures.

Purpose of the Study:

• To propose and investigate a novel strategy for robust, high-quality self-assembly of nontrivial periodic structures using patchy particles.
• To demonstrate the efficacy of combining specific particle interactions with a controlled assembly protocol.
• To computationally design and assemble a complex lattice structure as a proof of concept.

Main Methods:

• Utilized Brownian dynamics simulations to model and investigate the self-assembly process.
• Incorporated specific patch-patch and shell-shell interactions, implementable via differential DNA strand functionalization.
• Employed a layer-by-layer assembly protocol to guide structure formation and avoid random aggregation.

Main Results:

• Successfully designed and self-assembled a double diamond lattice structure in silico, composed of four distinct particle types.
• Demonstrated that the four particle types arrange into a body-centered cubic (bcc) crystal comprising four face-centered cubic (fcc) sublattices.
• Showed that the assembled lattice can be converted into a cubic diamond structure through selective particle removal.

Conclusions:

• The proposed strategy, integrating directional and selective interactions with a layer-by-layer protocol, enables robust and high-quality self-assembly.
• This approach offers a powerful method for constructing complex, ordered periodic structures from patchy particles.
• The findings pave the way for designing and fabricating advanced materials with tailored crystalline architectures.