pH-Responsive Nanoparticle Superlattices with Tunable DNA Bonds.

Area of Science:

• Nanomaterials Science
• Biomolecular Engineering
• Supramolecular Chemistry

Background:

• Stimuli-responsive nanomaterials offer tunable properties for diverse applications.
• DNA's programmable nature is utilized in designing switchable DNA-based architectures.
• A generalized stimulus for multiple structural outputs is needed.

Purpose of the Study:

• To design and characterize pH-dependent, switchable nanoparticle superlattices.
• To utilize i-motif DNA structures as pH-sensitive DNA bonds.
• To achieve multiple structural outputs from a single stimulus.

Main Methods:

• Synthesis of nanoparticle superlattices incorporating i-motif DNA.
• Characterization of superlattice structures under varying pH conditions.
• Analysis of reversible lattice expansion/contraction and symmetry changes.

Main Results:

• Successfully created pH-dependent nanoparticle superlattices.
• Observed reversible lattice expansion/contraction due to pH-induced DNA length changes.
• Demonstrated changes in crystal symmetry via pH-induced DNA bond dynamics.

Conclusions:

• Introduction of i-motifs enables pH-controlled dynamic modulation of crystalline architectures.
• This approach allows propagation of local molecular motion into global structural changes.
• Offers a generalized stimulus design for versatile nanomaterial reconfiguration.