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

Crobu, Maura; Rossi, Antonella; Mangolini, Filippo; Spencer, Nicholas D.

doi:10.1007/s00216-012-5836-7

Cited by 111 publications

(138 citation statements)

References 76 publications

(122 reference statements)

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“…The BO/NBO ratio before replacing the oil was obtained as 0.47 ( Point A1 Figure 5) which shows a long chain polyphosphate in the tribofilm (metaphosphate) [1]. Calculation of the binding energy difference between Zn3s-P2p3/2 peaks shows the same trend in identifying the chain length.…”

Section: Chemistry Of the Tribofilmmentioning

confidence: 81%

“…Crobu et al [1,24] characterised the surface chemistry of zinc polyphosphates using XPS and Time-of-Flight Secondary-Ion Mass Spectroscopy (ToF-SIMS) by assessing the intensity ratio of bridging oxygen (P-O-P) and non-bridging oxygen (P=O and P-O-M) and. The chain length of the glassy phosphates in the tribofilm can be identified by a combined use of bridging oxygen/non-bridging oxygen (BO/NBO) intensity ratio and the difference in binding energies between the Zn3s-P2p3/2 peaks from XPS and a modified Auger parameter.…”

Section: Chemistry Of Zddp Tribofilmmentioning

confidence: 99%

“…The minimum EHL film thickness is calculated by using Hamrock-Dowson equation as the following: (1) Where is the radius of curvature in the x-direction (m), is the entrainment speed (m/s), …”

Section: Materials and Test Conditionsmentioning

confidence: 99%

“…According to the refs [1,24], in this case the composition of the tribofilm is zinc pyrophosphate. This value is calculated to be 0.51 when the oil was replaced by a fresh ZDDP-containing oil (point C1 in Figure 5) and the tribofilm is mainly composed of metaphosphates (see Figure 6).…”

Section: Chemistry Of the Tribofilmmentioning

confidence: 99%

“…The results in Table 9 show that before suspending the test, the BO/NBO ratio is 0.47 (Point A3 in Figure 11) and the difference in binding energy for Zn3s and P2p is 6.57. This suggests that the tribofilm contains longer chain polyphosphates and mainly contains zinc metaphosphates [1,24]. After the suspension of the test and once the oil is replaced, the softer top part of the tribofilm (consisting of long chain polyphosphates) is removed.…”

Section: Chemistry Of the Tribofilmmentioning

confidence: 99%

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A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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Understanding the true interfacial mechanisms involved in the growth of tribofilms generated by Zinc Dialkyl Dithiophosphate (ZDDP) is important because it is the most widely used antiwear additive and there is legislative pressure to find efficient environmentally-friendly replacements. The main focus of this study is to investigate the durability of the ZDDP tribofilm and correlate it to the chemical and physical properties of the glassy polyphosphates.A novel experimental method has been developed to study the effect of lubricant temperature and contact load on tribofilm growth and durability. Results show that physical parameters such as temperature and pressure significantly influence the tribofilm durability. XPS analyses were carried out before suspending the test and after changing the oil to assess the difference in chemical structure of the tribofilm before and after stopping the test. The chemical analyses suggest that there are different chemical properties across the thickness of the tribofilm and these determine the durability characteristics.

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Section: Chemistry Of the Tribofilmmentioning

confidence: 81%

Section: Chemistry Of Zddp Tribofilmmentioning

confidence: 99%

Section: Materials and Test Conditionsmentioning

confidence: 99%

Section: Chemistry Of the Tribofilmmentioning

confidence: 99%

Section: Chemistry Of the Tribofilmmentioning

confidence: 99%

See 3 more Smart Citations

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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Nonfouling Response of Hydrophilic Uncharged Polymers

Serrano

Sterner

Mieszkin

et al. 2013

Adv Funct Materials

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IntroductionFouling impairs the function of all structures immersed in seawater, including ship hulls, aquaculture nets, and static structures. Prevention of marine fouling represents an unsolved challenge with the potential for huge savings in terms of reduced energy consumption due to reduced frictional drag losses and weight, as well as increased life-time and maintenance intervals for exposed components. [ 1 , 2 ] The high level of complexity in the biointerfacial processes involved in biofouling, and the many different length and time scales [ 3 ] involved, characterize the diffi culty in fi nding the most appropriate solution to the problem. Several strategies have been used in order to control fouling in the marine environment: besides a number of approaches to simplify the process of mechanical removal of the formed deposits, the use of antifouling paints incorporating biocides [ 4 ] is the most commonly employed approach. However, strategies that aim at the generation of passive, non-interacting, non-adhesive surface structures or coatings [ 5 ] are gaining more and more importance, and information gained from materials designed to combat fouling by proteins or biomedically important microorganisms are aiding the development of environmentally benign marine coatings. [ 6 ] The use of hydrophilic and uncharged polymers is often considered as a possible approach, and it has been shown that brush-forming polymers displaying hydration properties, that is, the capability to bind water around the polymer chain, [ 7 , 8 ] can be used to reduce the uptake of biological entities (e.g., macromolecules, cells, larvae) under various conditions. For example, the settlement (attachment) of zoospores of the marine alga Ulva linza and diatoms (unicellular slime-forming algae) and the adsorption of various proteins (fi brinogen, myoglobin, albumin, or full blood serum) have been shown to be signifi cantly reduced on poly(ethylene glycol) (PEG)-coated surfaces, [ 6 , 9 , 10 ] as well as on polymeric coatings incorporating PEGylated moieties; [11][12][13] the polymer poly(2-ethyl-2-oxazoline) (PEOXA) has been studied as a liposomal surface modifi er for drug-delivery vesicles with an effi ciency similar to PEG, [ 14 ] but has also been shown to be resistant to bovine serum albumin (BSA) adsorption; [ 15 ] poly(vinyl pyrrolidone) (PVP) has been shown to decrease fouling by lysozyme, BSA and fi brinogen; [16][17][18] poly(vinyl alcohol) (PVA) was found to be effective in reducing the adhesion of the diatom Amphora coffeaeformis independently of the shear rate the surfaces were subjected to, [ 19 ] and as a gel has been shown to reduce barnacle attachment; [ 20 , 21 ] and dextran has shown the ability to reduce adsorption of human-serum proteins. [ 22 , 23 ] Nonfouling Response of Hydrophilic Uncharged PolymersPolymeric ultrathin fi lms present a possible line of attack against marine biofouling for some applications. A protocol that provides a reliable comparison of the resistance of different polymers to biofouling ...

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ZnP‐Coated Zn1Cu0.1Ti Membrane with High Strength‐Ductility, Antibacterial Ability, Cytocompatibility, and Osteogenesis for Biodegradable Guided Bone Regeneration Applications

Tong

Han

Zhu

et al. 2023

Adv Funct Materials

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Zinc (Zn) and its alloys have recently gained research interest due to their good biosafety, biological function, biodegradability, and formability. Zincphosphate (ZnP) coating has been shown to improve the corrosion resistance and biocompatibility of Zn alloys. Here, a biodegradable ZnP-coating on Zn1Cu0.1Ti (ZCT) membrane with high strength-ductility and mechanical stability, suitable degradation rate, effective antibacterial ability, excellent in vitro and in vivo cytocompatibility, and osteogenesis is reported. The ZnPcoated ZCT exhibits high strength-ductility with a yield strength of 264 MPa, ultimate tensile strength of 312 MPa, elongation of 36.0%, and high mechanical stability before and after 30 d immersion in Hanks' and AS solutions, all of which are higher than those of ZCT. The ZnP coating shows good deformation resistance, healing effect, and bond strength with the substrate, meeting the clinical contour shaping requirements. The ZnP-coated ZCT membrane sample shows higher cell viability toward MC3T3-E1 and MG-63 cells, osteogenic and mitochondrial quality-control properties in vitro than those of the ZCT sample. Using a rat calvarial defect model, the ZnP-coated ZCT membrane shows complete biosafety and considerable osteogenesis performance. Overall, the ZnP-coated ZCT membrane is recommended as a promising biodegradable implant material for oral guided bone regeneration application.

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

Cited by 111 publications

References 76 publications

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Nonfouling Response of Hydrophilic Uncharged Polymers

ZnP‐Coated Zn1Cu0.1Ti Membrane with High Strength‐Ductility, Antibacterial Ability, Cytocompatibility, and Osteogenesis for Biodegradable Guided Bone Regeneration Applications

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