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Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Updated: Jul 30, 2025

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

Shape-induced crystallization of binary DNA-functionalized nanocubes.

Yunhan Zhang^1,2, Giuliana Giunta², Haojun Liang¹

¹Department of Polymer Science and Engineering, CAS Key Laboratory of Soft Matter Chemistry, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.

The Journal of Chemical Physics

|May 12, 2023

Summary

This summary is machine-generated.

DNA-functionalized cubic nanoparticles self-assemble into various superlattice structures. Longer, flexible DNA strands promote a phase transformation from simple cubic to plastic body-centered tetragonal structures, driven by entropic gains.

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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Area of Science:

Materials Science
Nanotechnology
Computational Chemistry

Background:

Anisotropic nanoparticles offer control over superlattice crystallization.
DNA-functionalization enables precise control over nanoparticle assembly.

Purpose of the Study:

Investigate the self-assembly of DNA-functionalized cubic nanoparticles.
Determine the influence of DNA strand properties on resulting superlattice structures.

Main Methods:

Coarse-grained molecular dynamics simulations were employed.
Analyzed the self-assembly of binary mixtures of cubic gold nanoparticles.
Calculated potentials of mean force and free energies.

Main Results:

Observed spontaneous formation of simple cubic (SC), plastic body-centered tetragonal (pBCT), and disordered pBCT phases.
Identified DNA strand length, grafting density, and rigidity as key factors.
Demonstrated that longer, flexible DNA strands favor the pBCT phase over SC due to entropic effects.

Conclusions:

DNA-functionalized cubic nanoparticles can form diverse superlattices.
Tailoring DNA strand characteristics is crucial for directing self-assembly.
Findings provide a roadmap for designing nanoparticle superlattices.