4.5 Article

Kosmotropic Electrolyte (Na2CO3, NaF) Perturbs the Air/Water Interface through Anion Hydration Shell without Forming a Well-Defined Electric Double Layer

Journal

JOURNAL OF PHYSICAL CHEMISTRY B
Volume 125, Issue 16, Pages 3977-3985

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.0c11024

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Funding

  1. DAE (HBNI, BARC)

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The study reveals that the perturbation of interfacial water by kosmotropic electrolytes causes a stronger hydrogen bond formation with surface-expelled anions, resulting in a more heterogeneous interface.
The ion-driven electric double layer (EDL) and the structural transformation of interfacial water are implicated in unusual reaction kinetics at the air/water interface. By combining heterodyne-detected vibrational sum frequency generation (HD-VSFG) with differential spectroscopy involving simultaneous curve fitting (DS-SCF) analysis, we retrieve electrolyte (Na2CO3 and NaF)-correlated OH-stretch spectra of water at the air/water interface. Vibrational mapping of the perturbed interfacial water with the hydration shell spectra (obtained by DS-SCF analysis of Raman spectra) of the corresponding anion discloses that the kosmotropic electrolytes do not form well-defined EDL at the air/water interface. Instead, the interfacial water forms a stronger hydrogen-bond with the surface-expelled anions (CO32- and F-) and becomes more inhomogeneous than the pristine air/water interface. Together, the results reveal that the perturbation of interfacial water by the kosmotropic electrolyte is a local phenomenon confined within the hydration shell of the surface-expelled anion.

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