Polarization of water molecules at a charged interface: second harmonic studies of the silica/water interface

Ong, Shaowei; Zhao, Xiaolin; Eisenthal, Kenneth B.

doi:10.1016/0009-2614(92)85309-x

Cited by 720 publications

(1,213 citation statements)

References 26 publications

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“…18 The calculated value of φ 0 reaches a maximum near -120 mV with respect to the bulk liquid potential (assumed to be zero). In addition, the EW-CRDS measurements are sensitive to the surface coverage of the CV + chromophore.…”

Section: Discussionmentioning

confidence: 94%

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Adsorption of Crystal Violet to the Silica−Water Interface Monitored by Evanescent Wave Cavity Ring-Down Spectroscopy

et al. 2003

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Evanescent wave cavity ring-down spectroscopy (EW-CRDS) has been used to investigate the adsorption of crystal violet (CV + ) to a charged silica-water interface as a function of bulk pH by the direct measurement of the absorbance of the CV + chromophore. Absolute absorbances of order 10 -4 have been routinely detected, showing significant variation in the structure of the silica-water interface. At low ionic strength, the interfacial absorbance of CV + shows a monotonic increase with increasing pH. A simple competitive Langmuir adsorption model, which provides values for the silica surface parameters that are in broad agreement with the existing literature values, has been fit to the data. In addition, interfacial absorbance has been monitored as a function of pH for CV + solutions maintained at high ionic strength with NaCl, KCl, and CaCl 2 . As pH increases, the CV + interfacial absorbance exhibits a pronounced maximum, which occurs at pH 8.7 for Na + and K + and at pH 7.9 for Ca 2+ , followed by a sharp decrease. This trend is attributed to competitive binding between the metal cations and CV + to the silica surface binding site, and it has not been observed in previous measurements using second-harmonic generation. The simple Langmuir model, however, does not accurately describe the high ionic strength behavior.

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Section: Discussionmentioning

confidence: 94%

“…The prism was then rinsed thoroughly with ultrapure water and wiped with methanol. 18 The flow cell was assembled and flushed with methanol.…”

Section: Experimental Methodsmentioning

confidence: 99%

Adsorption of Crystal Violet to the Silica−Water Interface Monitored by Evanescent Wave Cavity Ring-Down Spectroscopy

et al. 2003

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“…The first population represents 15-20% of the total and has a pK a = 4.5 (about the same as for acetic acid), whereas the remaining one accounts for 80-85% and has a pK a = Ref. 96 . Copyright 1992 Elsevier.…”

Section: Bulk Data: Tg (Thermogravimetry) and Silanol Surface Densitiesmentioning

confidence: 99%

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

et al. 2013

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“…The resulting surface charges (and hence the surface field) and the preferred hydrogen-bonding geometry to the protonated or deprotonated surface sites, can reorient water molecules at the interface. This leads to an additional contribution to ) 2 ( S t , which can now be written as [37][38][39] …”

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

Structures and Charging of α-Alumina (0001)/Water Interfaces Studied by Sum-Frequency Vibrational Spectroscopy

et al. 2008

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Sum-frequency vibrational spectroscopy in the OH stretch region was employed to study structures of water/ -Al 2 O 3 (0001) interfaces at different pH values. Observed spectra indicate that protonation and deprotonation of the alumina surface dominate at low and high pH, respectively, with the interface positively and negatively charged accordingly. The point of zero charge (p.z.c.) appears at pH ~6.3, which is close to the values obtained from streaming potential and second harmonic generation studies. It is significantly lower than the p.z.c. of alumina powder. The result can be understood from the pK values of protonation and deprotonation at the water/ -Al 2 O 3

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Polarization of water molecules at a charged interface: second harmonic studies of the silica/water interface

Cited by 720 publications

References 26 publications

Adsorption of Crystal Violet to the Silica−Water Interface Monitored by Evanescent Wave Cavity Ring-Down Spectroscopy

Adsorption of Crystal Violet to the Silica−Water Interface Monitored by Evanescent Wave Cavity Ring-Down Spectroscopy

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

Structures and Charging of α-Alumina (0001)/Water Interfaces Studied by Sum-Frequency Vibrational Spectroscopy

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