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Spectroscopic evidence for acid-base interaction driven interfacial segregation.

Saranshu Singla1, Michael C Wilson, Ali Dhinojwala

  • 1Department of Polymer Science, University of Akron, Ohio 44325, USA. ali4@uakron.edu.

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This study introduces a new spectroscopy method to quantify interfacial composition and energy, crucial for understanding adhesion and purification. The findings reveal how molecular interactions drive interfacial segregation in liquid mixtures.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Quantifying interfacial composition and energy is vital for processes like purification and adhesion.
  • Traditional methods are insufficient for high-energy planar solid surfaces.

Purpose of the Study:

  • To develop and apply a novel interface-sensitive spectroscopy approach.
  • To calculate interfacial composition and energy for liquid mixtures.
  • To correlate molecular interactions with macroscopic interfacial behavior.

Main Methods:

  • Utilized interface-sensitive spectroscopy to determine interfacial composition.
  • Calculated interfacial energy differences from adsorption isotherms.
  • Compared experimental results with acid-base and dispersive interaction models.

Main Results:

  • Successfully quantified interfacial composition for acetone-chloroform, tetrahydrofuran-benzene, and N,N-dimethylformamide (DMF)-benzene mixtures.
  • Demonstrated agreement between interfacial energy calculated via segregation and via interaction models.
  • Identified acid-base interactions as the dominant force in interfacial segregation.
  • Provided evidence for DMF dimerization in benzene through comparative analysis.

Conclusions:

  • The developed spectroscopic approach enables accurate quantification of interfacial composition and energy.
  • Molecular interactions, particularly acid-base forces, significantly influence interfacial segregation.
  • This method offers new insights into interfacial phenomena like wetting and self-assembly.