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Related Experiment Videos

Stimuli-responsive surface localized ionic cluster (SLICs) formation from nonspherical colloidal particles.

David J Lestage1, Marek W Urban

  • 1School of Polymers and High Performance Materials, Shelby F. Thames Polymer Science Research Center, University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 13, 2005
PubMed
Summary

Phospholipids like DCPC stabilize colloidal dispersions, creating unique cocklebur particle morphologies. These particles exhibit stimuli-responsive behaviors, controllable via component ratios and temperature, offering new material design possibilities.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Polymer Science

Background:

  • Phospholipids are amphiphilic molecules with structural features enabling their use in stabilizing colloidal dispersions.
  • Controlling phospholipid concentration is key to managing particle synthesis and film properties.

Purpose of the Study:

  • To investigate the role of 1,2-Bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DCPC) as a cosurfactant in stabilizing colloidal dispersions.
  • To elucidate the formation and stimuli-responsive behavior of surface localized ionic clusters (SLICs) in coalesced films.

Main Methods:

  • Synthesis of methyl methacrylate/n-butyl acrylate (MMA/nBA) colloidal dispersions using DCPC and sodium dioctyl sulfosuccinate (SDOSS).
  • Preparation of films with varying DCPC concentrations, Ca2+ presence, and annealing temperatures.

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  • Characterization using attenuated total reflectance Fourier transform infrared (ATR-FTIR) and internal reflection infrared imaging (IRIRI) spectroscopies.

    • Main Results:

    • DCPC concentration influenced the formation of cocklebur particle morphologies.
    • Coalesced films exhibited stimuli-responsive behaviors, particularly concerning SLIC formation at interfaces.
    • SLIC formation was sensitive to DCPC concentration, Ca2+/DCPC ratios, and temperature.

    Conclusions:

    • Phospholipids can effectively control colloidal dispersion particle morphology and film properties.
    • Stratification and interfacial mobility are controllable during film formation.
    • Synergistic interactions and colloidal morphology dictate stimuli-responsive behaviors in films.