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Researchers developed pH-responsive membranes using DNA-grafted gold nanoparticles (DNA-NPs). These nanoscale systems reversibly switch between expanded and contracted states, controlling interfacial properties for advanced applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • Stimuli-responsive 2D nanoscale systems offer control over interfacial properties at liquid interfaces.
  • Such control is crucial for applications in bio-reactors, microfluidics, and soft robotics.

Purpose of the Study:

  • To explore the formation of a pH-responsive membrane using gold nanoparticles grafted with DNA (DNA-NPs) at a liquid-vapor interface.
  • To investigate the reversible switching behavior of a DNA-NP 2D hexagonal lattice in response to pH modulation.

Main Methods:

  • Formation of a 2D hexagonal lattice of DNA-NPs at a liquid-vapor interface.
  • Utilizing pH modulation to induce reversible lattice contraction and expansion.
  • In situ surface X-ray scattering to analyze lattice structural changes.

Main Results:

  • A reversible pH-responsive membrane was formed from DNA-NPs.
  • The DNA-NP lattice switched between an expanded state (neutral pH) and a contracted state (acidic pH) due to DNA base pairing.
  • Lattice contraction was tunable by linker length, achieving up to ~71% surface area change.

Conclusions:

  • DNA-NPs form a switchable 2D membrane at liquid interfaces.
  • pH modulation effectively controls the nanoscale system's assembly and interfacial properties.
  • The tunable nature of the DNA-NP lattice offers potential for responsive materials design.