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Surface second harmonic generation studies of the dodecane/water interface: the equilibrium and kinetic behaviour of p-nitrophenol and tri-n-butyl phosphate

Surface second harmonic generation studies of the dodecane/water interface: the equilibrium and kinetic behaviour of p-nitrophenol and tri-n-butyl phosphate
Surface second harmonic generation studies of the dodecane/water interface: the equilibrium and kinetic behaviour of p-nitrophenol and tri-n-butyl phosphate
The behaviour of p-nitrophenol (PNP) absorbed at the dodecane/water interface and the interaction with tri-n-butyl phosphate (TBP) were studied by surface second harmonic generation (SHG). The polarisation dependence of the PNP SHG signal, which is the same for all concentrations of PNP and TBP, is best described in terms of a limiting weak orientational order. In the presence of TBP, the SHG signal initially increases with PNP concentration, passes through a maximum and then it decreases. At low PNP concentrations, increasing the TBP concentration leads to an increase in the SHG intensity, but for higher PNP concentrations the intensity decreases. The free energies of adsorption for PNP and TBP to the dodecane/water interface were determined using Frumkin and Langmuir isotherms. The kinetics of the interaction between TBP and PNP was observed by monitoring the SHG signal along a liquid-liquid flow cell and found to be first-order at high interfacial coverage with rate constant, k, of 0.1 +/- 0.01 s(- 1).
2nd-harmonic generation, water interface, molecular-orientation, dynamics, adsorption, silica, air
1463-9076
3235-3245
Haslam, S.
81884a4d-5a11-4d59-94a3-fd9c50d4efe4
Croucher, S.G.
ffa34a37-76ff-4eae-a51c-beb518b37106
Hickman, C.G.
4a32f667-b1b1-40f6-ac67-035d5095d0e4
Frey, J.G.
bcd6120a-ce66-4e01-99b5-9ced44cd0ec9
Haslam, S.
81884a4d-5a11-4d59-94a3-fd9c50d4efe4
Croucher, S.G.
ffa34a37-76ff-4eae-a51c-beb518b37106
Hickman, C.G.
4a32f667-b1b1-40f6-ac67-035d5095d0e4
Frey, J.G.
bcd6120a-ce66-4e01-99b5-9ced44cd0ec9

Haslam, S., Croucher, S.G., Hickman, C.G. and Frey, J.G. (2000) Surface second harmonic generation studies of the dodecane/water interface: the equilibrium and kinetic behaviour of p-nitrophenol and tri-n-butyl phosphate. Physical Chemistry Chemical Physics, 2 (14), 3235-3245. (doi:10.1039/b000200n).

Record type: Article

Abstract

The behaviour of p-nitrophenol (PNP) absorbed at the dodecane/water interface and the interaction with tri-n-butyl phosphate (TBP) were studied by surface second harmonic generation (SHG). The polarisation dependence of the PNP SHG signal, which is the same for all concentrations of PNP and TBP, is best described in terms of a limiting weak orientational order. In the presence of TBP, the SHG signal initially increases with PNP concentration, passes through a maximum and then it decreases. At low PNP concentrations, increasing the TBP concentration leads to an increase in the SHG intensity, but for higher PNP concentrations the intensity decreases. The free energies of adsorption for PNP and TBP to the dodecane/water interface were determined using Frumkin and Langmuir isotherms. The kinetics of the interaction between TBP and PNP was observed by monitoring the SHG signal along a liquid-liquid flow cell and found to be first-order at high interfacial coverage with rate constant, k, of 0.1 +/- 0.01 s(- 1).

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More information

Published date: 2000
Keywords: 2nd-harmonic generation, water interface, molecular-orientation, dynamics, adsorption, silica, air

Identifiers

Local EPrints ID: 15917
URI: http://eprints.soton.ac.uk/id/eprint/15917
ISSN: 1463-9076
PURE UUID: d5901ce6-1d3c-4faf-bf29-673df5350b95

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Date deposited: 15 Jun 2005
Last modified: 15 Jul 2019 19:31

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Contributors

Author: S. Haslam
Author: S.G. Croucher
Author: C.G. Hickman
Author: J.G. Frey

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