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Nanoparticle assemblies as probes for self-assembled monolayer characterization: correlation between surface

Bernhard Feichtenschlager1, Silvia Pabisch, Herwig Peterlik

  • 1Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165, 1060 Vienna, Austria.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 17, 2011
PubMed
Summary

Researchers studied dodecyl chain ordering in mixed monolayers on zirconia nanocrystals. Coadsorbing agents disrupt chain packing, reducing particle agglomeration and offering molecular control over self-assembled monolayers.

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Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles

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Area of Science:

  • Surface Chemistry
  • Nanomaterials Science
  • Materials Science

Background:

  • Phosphonic acids are used as capping agents for metal oxide nanoparticles.
  • Controlling nanoparticle surface properties is crucial for applications.
  • Understanding self-assembled monolayers on nanoparticles is key to tailoring their behavior.

Purpose of the Study:

  • To investigate the ordering of dodecyl chains in mixed phosphonic acid monolayers on zirconia nanocrystals.
  • To determine how coadsorbed capping agents influence chain ordering and nanoparticle agglomeration.
  • To explore the use of nanoparticles as probes for self-assembled monolayer investigations.

Main Methods:

  • Synthesis of zirconia nanocrystals.
  • Formation of mixed monolayers using various phosphonic acids (methyl-, phenyl-, pyryl-, tert-butylphosphonic acids) with dodecylphosphonic acid.
  • Fourier Transform Infrared (FTIR) spectroscopy to analyze surface groups and chain ordering.
  • Small-Angle X-ray Scattering (SAXS) to study nanoparticle agglomeration and structure.

Main Results:

  • Increasing amounts of coadsorbed capping agents significantly reduce the ordering of dodecyl chains.
  • Coadsorption of capping agents decreases nanoparticle agglomeration.
  • A strong correlation exists between alkyl chain ordering and particle agglomeration behavior.
  • Interparticle bilayers formed by alkyl chain packing are responsible for agglomeration.

Conclusions:

  • Nanoparticle agglomeration can be controlled at a molecular level by adjusting the composition of coadsorbed capping agents.
  • Coadsorbed molecules influence the ordering of surface-bound alkyl chains.
  • Nanoparticles can serve as indirect probes for self-assembled monolayer investigations using SAXS, correlated with FTIR analysis.