Direct Quantification of Water Surface Charge by Phase-Sensitive
Second Harmonic Spectroscopy
Posted on 2019-08-23 - 13:43
We
developed and verified a phase-sensitive second harmonic generation
spectroscopic scheme that allows for direct determination of the absolute
surface charge density and surface potential of a water interface
without the need for prior interfacial information. The method relies
on selective probing of surface-field-induced reorientation order
of water molecules in the electrical double layer and is, hence, independent
of the interfacial molecular bonding structure. Application of this
technique to a mixed surfactant monolayer on water suggests the manifest
effect of the chain–chain interactions among the monolayer
on adsorption of soluble ionic surfactants. We also deduce the third-order
nonlinear susceptibility of bulk water and prove its applicability
to analysis of charges of various water interfaces. In addition, we
show that Debye–Hückle theory should be avoided in the
spectroscopic analysis for its potential significant error, as evidenced
experimentally and theoretically.
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Dalstein, Laetitia; Chiang, Kuo-Yang; Wen, Yu-Chieh (2019). Direct Quantification of Water Surface Charge by Phase-Sensitive
Second Harmonic Spectroscopy. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b02156
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AUTHORS (3)
LD
Laetitia Dalstein
KC
Kuo-Yang Chiang
YW
Yu-Chieh Wen