The adsorption and thermal decomposition of tricresylphosphate (TCP) on iron and gold

Wheeler, Donald R.; Faut, O. D.

doi:10.1016/0169-4332(84)90040-0

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Deconvoluting the C1 s and O1 s peaks (Supplementary Fig. 1h, i ) revealed the presence of C–C, C=C, –CH 2 –O, C–O, C=O, O=C–O, and O–H 27 , 28 . The abundant hydrophilic functional groups on the CD surface allowed them to disperse well in the experimental medium.…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of carbon dots cause cytotoxicity

et al. 2021

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Carbon dots (CDs) are photoluminescent nanomaterials with wide-ranging applications. Despite their photoactivity, it remains unknown whether CDs degrade under illumination and whether such photodegradation poses any cytotoxic effects. Here, we show laboratory-synthesized CDs irradiated with light degrade into molecules that are toxic to both normal (HEK-293) and cancerous (HeLa and HepG2) human cells. Eight days of irradiation photolyzes 28.6-59.8% of the CDs to <3 kilo Dalton molecules, 1431 of which are detected by high-throughput, non-target high-performance liquid chromatography-quadrupole time-of-flight mass spectrometry. Molecular network and community analysis further reveal 499 cytotoxicity-related molecules, 212 of which contain polyethylene glycol, glucose, or benzene-related structures. Photo-induced production of hydroxyl and alkyl radicals play important roles in CD degradation as affected by temperature, pH, light intensity and wavelength. Commercial CDs show similar photodegraded products and cytotoxicity profiles, demonstrating that photodegradation-induced cytotoxicity is likely common to CDs regardless of their chemical composition. Our results highlight the importance of light in cytocompatibility studies of CDs.

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Section: Resultsmentioning

confidence: 99%

Photodegradation of carbon dots cause cytotoxicity

et al. 2021

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“…11,24 A comparison of gold and iron showed that TCP physisorbed and then desorbed at higher temperatures on inert gold surfaces but decomposed and formed a film on ferrous surfaces. 25 A study that included both commercial-grade TCP and pure TCP isomers found that reactivity on various metals/oxides increased with increasing surface oxidation state. 8 That study also showed that different types of steel exhibited different levels of reactivity, with 316C stainless steel being the least active.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition of Tricresyl Phosphate on Ferrous Surfaces

et al. 2021

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Tricresyl phosphate (TCP) forms protective films on moving mechanical components through thermally driven decomposition and interactions with the ferrous surfaces of the components. These reactions are hidden from view in moving interfaces, but are known to be sensitive to both the surface material and the isomeric form of the TCP. Here, temperature-programmed reaction spectroscopy (TPRS) and gas chromatography-mass spectroscopy (GC-MS) are complemented by reactive molecular dynamics (MD) simulations to investigate the thermal decomposition of meta and para isomers of TCP reacting with ferrous materials. Key observations are that the primary decomposition product of TCP is cresol, more cresol is generated on Fe 2 O 3 than on Fe 3 O 4 , and that para-TCP isomers are more reactive than meta-TCP isomers. These trends are explained using the simulations to identify multiple reaction pathways leading to cresol formation. The likelihood of each pathway is quantified and correlated to surface material and TCP isomer trends in terms of energy barriers for the rate-limiting steps in the decomposition reactions.

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“…The XPS survey spectrum of the PFTS coating on silicon and the TCP/PFTS layers on silicon confirmed the presence of all the expected surface species (silicon, carbon, oxygen, and fluorine) [35] except for phosphorus from TCP. Although peaks were evident in the P 2p region between 124 and 144 eV, these could not conclusively be identified as phosphorus since single crystal silicon substrates produce plasmon resonances that directly overlap at the same binding energy.…”

Section: Characterizationmentioning

confidence: 65%

A Nano- to Macroscale Tribological Study of PFTS and TCP Lubricants for Si MEMS Applications

et al. 2010

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The reliability and lifetime of cyclic contacting Si MEMS is limited by adhesion and their tribological performance. In this study, the tribological effects of adding a lubricant (tricresyl phosphate, TCP) to a bound self-assembled monolayer (perfluorodecyltrichlorosilane, PFTS) at different length scales were examined using a quartz crystal microbalance (QCM), an atomic force microscope (AFM), a reciprocating microtribometer, and a macroscopic reciprocating tribometer. The results showed that the addition of TCP to a PFTS layer increased the number of cycles possessing low friction and wear by at least a factor of four in the macroscopoic tribometer. Differences in friction response over the range of experimental scales were correlated to contact size and pressure. QCM measurements of TCP on PFTS showed a non-zero slip time, which suggests favorable tribological performance in larger length-scale regimes. This non-zero slip time also may indicate TCP mobility.

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The adsorption and thermal decomposition of tricresylphosphate (TCP) on iron and gold

Cited by 4 publications

References 13 publications

Photodegradation of carbon dots cause cytotoxicity

Photodegradation of carbon dots cause cytotoxicity

Thermal Decomposition of Tricresyl Phosphate on Ferrous Surfaces

A Nano- to Macroscale Tribological Study of PFTS and TCP Lubricants for Si MEMS Applications

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