Stabilized DNA Colloidal Crystals via Cross-Linking

The patent uses disulfide crosslinking as an intermediary mechanism that selectively stabilizes only the DNA hybridized state. The disulfide bonds form between cysteine residues on the DNA strands when they are hybridized, creating a stable network that locks the crystal structure. This intermediary crosslinking mechanism provides thermal and chemical stability while preserving the flexibility needed for contraction and expansion, because the crosslinks only form when DNA strands are properly hybridized and can dynamically respond to environmental changes.

The patent employs disulfide crosslinking that changes its bonding state based on environmental parameters. The disulfide bonds can form and break dynamically in response to changes in solvent conditions, temperature, and chemical environment. This parameter-dependent crosslinking mechanism allows the crystal structure to remain stable under normal conditions while maintaining the ability to respond to environmental stimuli, thus preserving solvent-dependent responsiveness without sacrificing structural stability.

The patent creates a composite stabilization system that combines DNA structural links with disulfide crosslinks. The DNA sequences provide precise control over crystal structure formation and positioning, while the disulfide crosslinks provide enhanced stability in various chemical environments. This composite approach integrates two different mechanisms: the programmable DNA hybridization for structural precision and the chemically stable disulfide bonds for environmental robustness, achieving both precise crystal structure control and reliable stability.