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Direct Quantification of Water Surface Charge by Phase-Sensitive Second Harmonic Spectroscopy.

Laetitia Dalstein1, Kuo-Yang Chiang1, Yu-Chieh Wen1

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A new phase-sensitive spectroscopy method directly measures water interface charge and potential without prior data. This technique probes water molecule reorientation in the electrical double layer, offering insights into surfactant interactions and bulk water properties.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Accurate characterization of interfacial properties is crucial for understanding chemical and physical processes.
  • Existing methods for determining surface charge density and potential often require prior knowledge of interfacial structure or rely on models with limitations.

Purpose of the Study:

  • To develop and validate a novel phase-sensitive second harmonic generation (SHG) spectroscopic scheme.
  • To enable direct determination of absolute surface charge density and surface potential at water interfaces.
  • To investigate the influence of interfacial molecular structure and bulk properties on spectroscopic measurements.

Main Methods:

  • Development of a phase-sensitive SHG spectroscopic technique.
  • Selective probing of surface-field-induced reorientation order of water molecules within the electrical double layer.
  • Application to a mixed surfactant monolayer on water and bulk water analysis.

Main Results:

  • Direct measurement of absolute surface charge density and potential achieved without prior interfacial information.
  • Demonstrated independence from interfacial molecular bonding structure.
  • Revealed the significant effect of surfactant chain-chain interactions on adsorption.
  • Deduced the third-order nonlinear susceptibility of bulk water.
  • Provided experimental and theoretical evidence against the use of Debye-Hückle theory in this spectroscopic analysis.

Conclusions:

  • The developed phase-sensitive SHG spectroscopy is a powerful tool for characterizing water interfaces.
  • The method offers a robust alternative to existing techniques, overcoming limitations related to interfacial information and theoretical models.
  • Findings provide new insights into interfacial phenomena, including surfactant behavior and the properties of bulk water.