High-resolution valence-band XPS spectra of the nonconductors quartz and olivine

Zakaznova-Herzog, V.P.; Nesbitt, H.W.; Bancroft, G.M.; Tse, John S.; Gao, Xing; Skinner, William

doi:10.1103/physrevb.72.205113

Cited by 78 publications

(63 citation statements)

References 48 publications

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“…Reference source not found.). 36,44 No peak was present at ~101.5 eV, ruling out polysiloxanes as a potential source of silicon contamination. 45 Previous XPS studies have identified silicon in leaf surface waxes, citing silica as one of its possible forms.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 91%

Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea

Wigzell

Racoviţǎ

Stentiford

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea, Colloids and Surfaces A: Physicochemical and Engineering Aspects http://dx. HIGHLIGHTS Dual hydrophobic-hydrophilic wettability of young Phyllostachys aurea bamboo leaf surfaces leads to water channelling and self-cleaning. Nanoscale roughness of epicuticular waxes combined with very-long-chain alkyl compounds underpin localised leaf wetting characteristics. Bioinspired replication of dual wetting hydrophobic -hydrophilic channelled surfaces may offer potential for fog collection and dew harvesting in water-scarce regions of the world. ABSTRACTThe young leaves of the bamboo plant, Phyllostachys aurea, exhibit a distinct dual wetting behaviour on their adaxial surface. Contact angle analysis, variable pressure (environmental) scanning electron microscopy, gas chromatography, time-of-flight secondary ion mass spectrometry, and X-ray photoelectron spectroscopy have shown that the epicuticular wax morphology/topography and the surface distribution of chemical species underpin this water-channelling behaviour. Envisaged bioinspired applications include fog and dew harvesting in water-scarce regions of the world.

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Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 91%

Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea

Wigzell

Racoviţǎ

Stentiford

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The Kratos instrument uses a novel magnetic lens system to effectively eliminate differential charge broadening in non-conductors; and indeed, Nesbitt et al (2004) showed that the same linewidth can be obtained on analogous semiconductor and bulk non-conductors. In addition, XPS valence bands of these minerals reveal many features heretofore unobserved, and high-quality pseudopotential density functional calculations on quartz, olivines and pyroxenes (Zakaznova-Herzog et al, 2005 reproduce well the valence band spectra of the three classes of minerals, thus providing insight into the origins of these details. This agreement gives us considerable confidence when interpreting the spectra of pristine and leached surfaces of these minerals.…”

Section: Introductionmentioning

confidence: 94%

“…Highly resolved valence band (VB) spectra of non-conductor silicates also have been obtained (Nesbitt et al, 2004;Zakaznova-Herzog et al, 2005. The Kratos instrument uses a novel magnetic lens system to effectively eliminate differential charge broadening in non-conductors; and indeed, Nesbitt et al (2004) showed that the same linewidth can be obtained on analogous semiconductor and bulk non-conductors.…”

Section: Introductionmentioning

confidence: 95%

Characterization of leached layers on olivine and pyroxenes using high-resolution XPS and density functional calculations

Zakaznova-Herzog

Nesbitt

Bancroft

et al. 2008

Geochimica et Cosmochimica Acta

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“…For example, olivine contains only NBO, but its O1s spectrum 18 (Fig. 3) displays a clear tail towards the higher binding energies typically associated with BO.…”

Section: Precision and Accuracy Of The O1s Xps Datamentioning

confidence: 99%

“…3) displays a clear tail towards the higher binding energies typically associated with BO. This tail was interpreted to result from surface hydroxyls 18 and comprises ϳ6% of the O1s signal. A similar tail will be misinterpreted as excess BO in the incompletely resolved spectra of silicate glasses.…”

Section: Precision and Accuracy Of The O1s Xps Datamentioning

confidence: 99%

Comment on “Spectroscopic studies of oxygen speciation in potassium silicate glasses and melts”

Malfait

2015

Can. J. Chem.

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Recent O1s XPS studies suggest that significant free oxide (O 2-or K-O-K) is present in potassium silicate glasses, in contrast with what was concluded from 29 Si and 17 O solid-state NMR data. An alternative peak assignment of the Q n peaks in the 29 Si NMR spectra was proposed to bring the 29 Si NMR data in line with the O1s data, but this reassignment (i) is not supported by any evidence other than the resulting agreement between the NMR and XPS data, (ii) is at odds with the spectral properties of the bands (peak position and width), (iii) ignores the strong evidence for the original peak assignment, and (iv) results in highly implausible equilibrium constants for the Q n speciation reactions. More likely causes for the apparent discrepancy between the XPS and NMR data are the incorrect estimation of the precision of the bridging oxygen content from the O1s XPS data, the systematic overestimation of the bridging oxygen content from the O1s XPS data, and (or) the incorrect estimation of the accuracy of the compositional analysis, which was based on the precision rather than the accuracy of the electron microprobe analysis. Thus, the available evidence strongly suggests that the original assignment of the 29 Si NMR spectra is correct. Neither the 29 Si NMR nor the O1s XPS data support the presence of significant amounts of free oxide in potassium silicate glasses with K 2 O/SiO 2 Ͻ Ͻ 2.Key words: potassium silicate glasses, free oxygen, O1s XPS, 29 Si NMR, peak assignment. Résumé :De récentes études en XPS de l'oxygène O1s semblent indiquer la présence importante d'oxyde libre (O 2-ou K-O-K) dans les verres de silicate de potassium, contrairement aux conclusions issues des données RMN 29 Si et 17 O à l'état solide. On y a proposé une attribution différente des pics des espèces Q n dans les spectres RMN 29 Si afin de mettre les données RMN du silicium 29 Si en conformité avec les données XPS de l'oxygène O1s. Toutefois, cette réattribution (i) n'est appuyée par aucune preuve autre que la correspondance résultante entre les données RMN et XPS, (ii) est en désaccord avec les propriétés spectrales des bandes (position et largeur des pics), (iii) fait abstraction des fortes indications appuyant l'attribution originale des pics et (iv) génère des constantes d'équilibre hautement improbables relativement aux réactions de spéciation Q n . Il apparaît plus probable que les incohérences apparentes entre les données XPS et RMN soient dues à une estimation erronée de la précision de la proportion d'atomes d'oxygène pontants à partir des données XPS O1s, à la surestimation systématique de la proportion d'atomes d'oxygène pontants à partir des données XPS O1s et (ou) à l'estimation erronée de l'exactitude de l'analyse élémentaire, laquelle était fondée sur la précision plutôt que sur l'exactitude de l'analyse par microsonde électronique. Par conséquent, l'ensemble des éléments probants dont on dispose laisse fortement supposer que l'attribution originale des spectres RMN 29 Si était correcte. Ni les données RMN ...

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High-resolution valence-band XPS spectra of the nonconductors quartz and olivine

Cited by 78 publications

References 48 publications

Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea

Smart water channelling through dual wettability by leaves of the bamboo Phyllostachys aurea

Characterization of leached layers on olivine and pyroxenes using high-resolution XPS and density functional calculations

Comment on “Spectroscopic studies of oxygen speciation in potassium silicate glasses and melts”

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