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Multiple hydrogen bonding for reversible polymer surface adhesion.

Kalpana Viswanathan1, Hayriye Ozhalici, Casey L Elkins

  • 1Department of Chemistry, Macromolecules and Interfaces Institute, Virginia Polytechnic Institute and State University, Blacksburg Virginia 24061, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 25, 2006
PubMed
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We developed a novel method for reversible surface adhesion using DNA base pairing. Polystyrene functionalized with thymine (PS-thymine) specifically binds to silicon surfaces modified with adenine, enabling controlled attachment and removal.

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Biomolecular Engineering

Background:

  • Developing surfaces with specific binding capabilities is crucial for advanced materials and biosensors.
  • DNA base pairing offers a highly specific and programmable molecular recognition mechanism.

Purpose of the Study:

  • To synthesize and characterize a novel adenine-functionalized silane for surface modification.
  • To demonstrate specific and reversible adhesion of thymine-functionalized polystyrene to adenine-modified silicon surfaces.
  • To investigate the role of hydrogen bonding in this surface association.

Main Methods:

  • One-step synthesis of adenine-containing triethoxysilane (ADPTES) from adenine and 3-isocyanatopropyl triethoxysilane (IPTES).
  • Characterization using NMR spectroscopy (1H, 13C, 29Si) and Fast Atom Bombardment Mass Spectrometry.

Related Experiment Videos

  • Surface modification of silicon with ADPTES and 3-mercaptopropyl triethoxysilane (MPTES).
  • Assessment of PS-thymine attachment using X-ray photoelectron spectroscopy (XPS) and water contact angle measurements.
  • Reversibility studies using tetrahydrofuran (THF) and dimethyl sulfoxide (DMSO) rinses.

    • Main Results:

    • Successful synthesis and characterization of ADPTES, confirming no premature hydrolysis.
    • Specific attachment of PS-thymine to ADPTES/MPTES-modified silicon surfaces, not to MPTES-only surfaces.
    • Demonstration of hydrogen bonding-mediated adenine-thymine association.
    • Solvato-reversible adhesion: PS-thymine attachment was stable to THF but reversible with DMSO, and reattachable afterward.

    Conclusions:

    • A novel adenine-functionalized silane enables specific immobilization onto silicon surfaces.
    • Adenine-thymine hydrogen bonding provides a mechanism for reversible surface adhesion.
    • The developed system exhibits solvato-reversible binding, allowing for controlled attachment and removal of functionalized polymers.