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Issue 5, 2019
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Spectroscopic evidence for acid–base interaction driven interfacial segregation

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Abstract

Quantification of interfacial composition and interfacial energy is essential for understanding prevalent phenomena such as purification and adhesion. However, for high-energy planar solid surfaces, traditional approaches for determining both parameters are inadequate. We take advantage of interface-sensitive spectroscopy to calculate the interfacial composition for acetone–chloroform, tetrahydrofuran–benzene, and N,N-dimethylformamide (DMF)–benzene mixtures. We calculate the differences in interfacial energy for the two components of each mixture from the adsorption isotherms and compare with that obtained from acid–base and dispersive interactions. The interfacial energy calculated using interfacial segregation agrees with the interfacial energy calculated by acid–base and dispersive interactions. The comparison illustrates how molecular interactions control macroscopic interfacial segregation. In all three mixtures, acid–base interactions dominate interfacial segregation. Comparing the two approaches for DMF–benzene mixtures leads to evidence of DMF dimerization in benzene. Using the present approach, the interfacial composition and interfacial energy can now be understood for interfacial behaviors including wetting and self-assembly.

Graphical abstract: Spectroscopic evidence for acid–base interaction driven interfacial segregation

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Publication details

The article was received on 09 Nov 2018, accepted on 11 Jan 2019 and first published on 11 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP06963H
Phys. Chem. Chem. Phys., 2019,21, 2513-2518

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    Spectroscopic evidence for acid–base interaction driven interfacial segregation

    S. Singla, M. C. Wilson and A. Dhinojwala, Phys. Chem. Chem. Phys., 2019, 21, 2513
    DOI: 10.1039/C8CP06963H

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