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Measuring the Equilibrium Spreading Pressure-A Tale of Three Amphiphiles.

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Measuring equilibrium spreading pressure (ESP) for solid surfactants is challenging. This study introduces methods to overcome experimental difficulties, enabling accurate ESP determination for various amphiphiles.

Keywords:
equilibrium spreading pressureexperimental protocolmonolayerssolid amphiphilessurface dissolutionsurface spreading

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Area of Science:

  • Surface Chemistry
  • Materials Science

Background:

  • Equilibrium spreading pressure (ESP) is crucial for understanding surfactant behavior at interfaces.
  • Existing methods for measuring ESP of solid amphiphiles are problematic, lacking standardized protocols.
  • Solid amphiphiles exhibit varying spreading behaviors on aqueous surfaces.

Purpose of the Study:

  • To address challenges in measuring the equilibrium spreading pressure (ESP) of solid amphiphiles.
  • To present experimental strategies for accurate ESP determination of surfactants with different spreading propensities.
  • To investigate the influence of experimental conditions on ESP measurements.

Main Methods:

  • Utilized a Wilhelmy plate setup to measure surface tension changes.
  • Employed a temporary mechanical barrier to mitigate Marangoni flow disturbances.
  • Investigated subphase presaturation to stabilize measurements.
  • Assessed ESP by analyzing pre-equilibrium plateaus for slow-spreading surfactants.
  • Introduced a volatile solvent to facilitate spreading of non-spreading amphiphiles.

Main Results:

  • n-Dodecanol, a readily spreading amphiphile, required mitigation of strong Marangoni flows.
  • Subphase presaturation significantly improved measurement accuracy and equilibration time for n-dodecanol.
  • 11:1 fluorotelomer alcohol demonstrated slow spreading, with ESP best estimated from pre-equilibrium plateaus.
  • DPPC, a non-spreading amphiphile, required a solvent-assisted method to form a monolayer and determine ESP.

Conclusions:

  • Developed and validated experimental techniques for measuring ESP of solid amphiphiles with diverse spreading characteristics.
  • Demonstrated the importance of controlling experimental conditions, such as subphase saturation and flow mitigation, for accurate ESP measurements.
  • Provided practical solutions for overcoming challenges associated with measuring ESP for both fast and slow-spreading surfactants.