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Related Experiment Videos

Odd-even chain length-dependent order in pH-switchable self-assembled layers.

Frank Auer1, Gabriele Nelles, Börje Sellergren

  • 1IBM E&TS Laboratory, Hechtsheimer Strasse 2, 55131 Mainz, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 30, 2004
PubMed
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Researchers studied self-assembling amphiphiles on gold surfaces. Odd-numbered chains formed bilayers, while even-numbered chains formed monolayers, depending on chain length and substituent position.

Area of Science:

  • Surface Science and Nanotechnology
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Bipolar amphiphiles are molecules with distinct hydrophilic and hydrophobic regions.
  • Self-assembled monolayers (SAMs) on gold surfaces are crucial for controlling surface properties.
  • Understanding amphiphile assembly is key for developing advanced functional materials.

Purpose of the Study:

  • To investigate the reversible self-assembly of bipolar amphiphiles on functionalized gold surfaces.
  • To determine how molecular structure (substituent position, chain length, parity) influences assembly behavior.
  • To explore the formation of monolayers versus bilayers and their stability.

Main Methods:

  • In-situ ellipsometry to monitor layer formation and thickness.

Related Experiment Videos

  • Infrared reflection absorption spectroscopy (IRAS) to analyze molecular orientation and order.
  • Atomic force microscopy (AFM) for high-resolution imaging of surface structures.

    • Main Results:

    • Para-substituted bisbenzamidines with odd-numbered alkyl chains (n=7, 9, 11) formed bilayered structures.
    • Even-numbered chains (n=6, 8, 10, 12) predominantly formed monolayers on mercaptoalkanoic acid SAMs.
    • Assembly behavior depended on amidine and acid chain lengths, substituent position, and chain parity, affecting tilt angles and molecular order.

    Conclusions:

    • The parity of the alkyl chain length is a critical factor in dictating amphiphile assembly into monolayers or bilayers.
    • A proposed model explains the observed differences in tilt angles and packing based on chain parity.
    • The bilayered assemblies demonstrated reversibility, with distinct layers destabilized at different pH values.