Surface reactivity of tributyl thiophosphate: effects of temperature and mechanical stress

Rossi, Antonella; Piras, Federica M.; Kim, D.; Gellman, Andrew J.; Spencer, Nicholas D.

doi:10.1007/s11249-006-9051-6

Cited by 52 publications

(58 citation statements)

References 48 publications

(49 reference statements)

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“…However, the BO/NBO ratio may be affected by contaminants or overlaps with the peaks from other components. Hydroxides and C=O (carbonyl and carbonate) can contribute to NBO peak [6,47] and P-O-C can contribute to BO peaks [58]. Also, the adsorbed water at 533.3-434.3 eV can bring about errors in the BO/NBO ratio [45].…”

Section: Ivi Chemical Composition Of the Tribofilm Top Layermentioning

confidence: 99%

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Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Soltanahmadi

Morina

Eijk

et al. 2017

Tribology International

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Water ingress into the lubricant as a contaminant affects performance leading to an alteration in wear, corrosion and fatigue behaviour of the tribological components especially in the rolling element bearings. The current study addresses the tribochemical phenomena involved in micropitting in tribocorrosion systems where different levels of dissolved-water are present in a model lubricant. In this study the effect of different temperatures, water concentrations and relative humidities have been investigated on micropitting under rolling/sliding contacts. The influence of free and dissolved water on tribocorrosive micropitting is clarified. The tribochemical change of the reaction films is studied using X-ray Photoelectron Spectroscopy (XPS) which confirmed that the (poly)phosphate chain length and tribofilm thickness are reduced with increased dissolved-water level.

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Section: Ivi Chemical Composition Of the Tribofilm Top Layermentioning

confidence: 99%

“…The higher ratio of the cations (Zn and Fe) to phosphorous [58] The maximum error for the measurements of the signal binding energies was ± 0.1 eV. The decimal digits in the table indicate the maximum deviation from the mean value of two fitted spectra (average of measurements on two specimens)…”

Section: Ivi Chemical Composition Of the Tribofilm Top Layermentioning

confidence: 99%

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Soltanahmadi

Morina

Eijk

et al. 2017

Tribology International

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show abstract

“…The determination of the chain length of phosphate glasses has been performed on the basis of 31 P magic angle spinning NMR spectroscopy in the solid state [6,[83][84][85] and in solution [3,7,13,14,78], by high-performance liquid chromatography of dissolved glasses [5], and on the basis of the BO/NBO ratio from curve-fitting of the O 1s XPS signal [27,31,45,48].…”

Section: Phosphorus and Zinc Chemical Statementioning

confidence: 99%

“…Since the chemical shift between these latter two signals, i.e., P0O and P-O-M, is small and, therefore, they cannot be distinguished by any XPS spectrometer, a single peak, labeled as nonbridging oxygen (NBO), is usually used in XPS curve-fitting procedures [36,37]. The identification of the chain length in polyphosphate glasses, including some binary zinc phosphates [6,38,39], on the basis of the BO/NBO ratio has been extensively reported in the literature [30,[40][41][42][43][44][45][46][47][48]. However, the quantification of the BO/NBO ratio is easily affected by the presence of contaminants.…”

Section: Introductionmentioning

confidence: 99%

Chain-length-identification strategy in zinc polyphosphate glasses by means of XPS and ToF-SIMS

et al. 2012

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The surface chemistry of amorphous zinc polyphosphates of different compositions (ranging from zinc metaphosphate to zinc orthophosphate) has been investigated by means of X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary-ion mass spectroscopy (ToF-SIMS). The identification of the chain length of zinc polyphosphates by XPS was on the basis of the integrated intensity ratio of the bridging (P-O-P) and nonbridging (P = O and P-O-M) oxygen peaks used for fitting the oxygen 1s signal, the shift of the P 2p(3/2) signal towards lower binding energies and the modified Auger parameter towards higher values as the zinc content increases. The discrimination of the polyphosphate chain lengths was also achieved by ToF-SIMS, by comparing the intensities of selected characteristic phosphate fragments. Both techniques appear to be suitable for the investigation of polyphosphate glasses in applications such as tribology, where there is a need to identify the chain length present in the outermost monolayer of the film. Fourier-transform infrared (FT-IR) spectroscopy was used to characterize the bulk compounds. The FT-IR studies showed that long-chain structures linked through P-O-P bonds predominate in the metaphosphate composition, while when the zinc content is increased, the chains become shorter, ultimately being replaced by PO(4) monomers in the orthophosphate composition.

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“…Infrared (IR) absorption spectroscopy [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and Raman spectroscopy [16][17][18] are particularly attractive tools for studying buried interfaces nondestructively. There are many practical and interpretational problems associated with the application of Raman and IR spectroscopy to in-contact studies.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid

et al. 2012

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Self-assembled monolayers (SAMs) of hexadecanethiol (HDT) and 16-mercaptohexadecanoic acid (MHDA) were used to vary the surface chemical properties, and oleic acid (OA) was used as a lubricant. A pin-on-disk tribometer equipped with Fourier transform IR (FT-IR) spectroscopy was used to evaluate the results of lubricants under various lubricating condition, and sum frequency generation (SFG) spectroscopy was used to obtain static information on the molecular structure of the boundary layer. The FT-IR results for the frictional properties of the SAMs lubricated with OA indicated that a transition from the hydrodynamic to mixed lubrication regime for the HDT-SAM occurred, however, the MHDA-SAM remained in the hydrodynamic lubrication regime under our experimental conditions. The FT-IR results indicate that in the hydrodynamic lubrication regime, the gauche/trans conformer ratio in the OA molecules decreased with the thinning of the oil film thickness for both HDT-and MHDA-SAMs. Upon the transition from the hydrodynamic to mixed lubrication regime, the gauche/trans conformer ratio increased. The SFG results for OA/HDT interface indicated that the HDT layer was only slightly influenced by the adsorption of OA, however, the adsorbed layer of the OA contained significant gauche defects. For the MHDA-SAM, OA molecules were adsorbed on the surface through hydrogen-bonding between their carboxyl groups. From the SFG and FT-IR results, the difference in the interaction between the types of SAMs and the OA is considered to affect the frictional properties of SAMs lubricated with OA.

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Surface reactivity of tributyl thiophosphate: effects of temperature and mechanical stress

Cited by 52 publications

References 48 publications

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Tribochemical study of micropitting in tribocorrosive lubricated contacts: The influence of water and relative humidity

Chain-length-identification strategy in zinc polyphosphate glasses by means of XPS and ToF-SIMS

Effects of Surface Chemical Properties on the Frictional Properties of Self-Assembled Monolayers Lubricated with Oleic Acid

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