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    Researchers developed pH-responsive nanoparticle superlattices using i-motif DNA. These structures dynamically change their lattice and symmetry in response to pH shifts, enabling versatile control over nanomaterial properties.

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    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.