Influence of interparticle interaction on melting of gold nanoparticles in Au/polytetrafluoroethylene nanocomposites

Yeshchenko, Oleg A.; Dmitruk, І.; Grytsenko, K.; Prokopets, Vadym M.; Kоtkо, А. V.; Schrader, Sigurd

doi:10.1063/1.3125274

Cited by 17 publications

(20 citation statements)

References 28 publications

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“…Studies have shown that Au nanoparticles can have significantly lower melting points than bulk gold, as low as 171°C [24]. In addition, when these particles are incorporated into a PTFE matrix they have shown to decrease the softening temperature of PTFE as observed by Yeshchenko et al [24]. The lower softening temperature and melting point is a significant factor behind the formation of the interconnected network observed in the PTFE ?…”

Section: Surface Topographymentioning

confidence: 93%

“…It is evident that the film has undergone a higher degree of melting as a result of the presence of Au nanoparticles within the PTFE matrix. Studies have shown that Au nanoparticles can have significantly lower melting points than bulk gold, as low as 171°C [24]. In addition, when these particles are incorporated into a PTFE matrix they have shown to decrease the softening temperature of PTFE as observed by Yeshchenko et al [24].…”

Section: Surface Topographymentioning

confidence: 94%

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Use of Au Nanoparticle-Filled PTFE Films to Produce Low-Friction and Low-Wear Surface Coatings

et al. 2014

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Polytetrafluoroethylene (PTFE) possesses exceptional lubricating properties; however, its uses are limited due to its high susceptibility to wear. In an effort to overcome this shortcoming, a great deal of focus is placed on creating PTFE composites that exploit the strengths of PTFE and also reduce or eliminate its weaknesses. This investigation explores the use of Au nanoparticle-filled PTFE films to produce low-friction and low-wear surface coatings. PTFE ? Au nanoparticle composite films were produced by dip coating stainless steel substrates into a mixture of colloidal PTFE and Au nanoparticles. Tribological tests showed that the composite film has a wear life that is twice that of pure PTFE and possesses an average coefficient of friction that is up to 50 % lower. PTFE suffers delamination as a result of poor adhesion of the film to the substrate and tearing resulting from a dominant adhesive wear mode. PTFE ? Au, on the other hand, shows no sign of delamination or adhesive wear. This change in wear mode caused by the addition of Au nanoparticles significantly increases the wear resistance and durability of PTFE.

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Section: Surface Topographymentioning

confidence: 93%

Section: Surface Topographymentioning

confidence: 94%

Use of Au Nanoparticle-Filled PTFE Films to Produce Low-Friction and Low-Wear Surface Coatings

et al. 2014

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“…Studies have shown that nanoparticles typically have lower melting points than their bulk form [17,18]. Cu nanoparticles, specifically, can begin to melt at the surface at temperatures as low as 200°C [19]. The slightly lower thickness of the PDA/ PTFE ?…”

Section: Particle Size and Surface Topographymentioning

confidence: 99%

The Influence of Cu Nanoparticles on the Tribological Properties of Polydopamine/PTFE + Cu Films

et al. 2015

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Polydopamine (PDA) is effective in increasing the adhesion between polytetrafluoroethylene (PTFE) and a stainless steel substrate, as a result reducing the wear in PTFE films by up to 500 times. By incorporating Cu nanoparticles in PTFE films, the wear resistance can be further enhanced. The present study examined the influence of Cu nanoparticles on the tribological properties of PDA/ PTFE films. Tribological tests were carried out using a linear-reciprocating, ball-on-flat configuration. The surface morphology and film wear were characterized using atomic force microscopy, scanning electron microscopy, optical microscopy, and contact profilometry. The results show that at a particularly low concentration of 0.01 wt%, Cu nanoparticles doubled the wear life of PDA/PTFE films. The increased wear resistance resulting from the incorporation of Cu nanoparticles is explained by four factors: increased spreading of the film resulting from a lower melting point, the formation of micro-cracks on the film surface reducing debris size, the formation of a transfer film on the counterface, and enhanced adhesion between the PTFE ? Cu composite and PDA, as well as enhanced cohesion in the composite film.

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“…In contrast, for nanoparticles larger than 20 nm, a gradual increase of the line-width along with an abrupt signifi cant increase (about 1.5 times) of the line-width was observed with the increase of the temperature. A second study by Yeshchenko et al addressed the liquid-solid transition in 5 nm spherical gold nanoparticles embedded in a polymer polytetrafl uoroethylene matrix [71] . A third study by the same authors addressed the size dependent melting of Ag nanoparticles (8 -30 nm) embedded in a silica matrix [72] .…”

Section: Melting/freezing Transitionmentioning

confidence: 99%

Nanoplasmonic sensing for nanomaterials science

Larsson¹,

Syrenova

Langhammer

2012

Nanophotonics

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Nanoplasmonic sensing has over the last two decades emerged as and diversifi ed into a very promising experimental platform technology for studies of biomolecular interactions and for biomolecule detection (biosensors). Inspired by this success, in more recent years, nanoplasmonic sensing strategies have been adapted and tailored successfully for probing functional nanomaterials and catalysts in situ and in real time. An increasing number of these studies focus on using the localized surface plasmon resonance (LSPR) as an experimental tool to study a process of interest in a nanomaterial, with a materials science focus. The key assets of nanoplasmonic sensing in this area are its remote readout, non-invasive nature, single particle experiment capability, ease of use and, maybe most importantly, unmatched fl exibility in terms of compatibility with all material types (particles and thin/thick layers, conductive or insulating) are identifi ed. In a direct nanoplasmonic sensing experiment the plasmonic nanoparticles are active and simultaneously constitute the sensor and the studied nano-entity. In an indirect nanoplasmonic sensing experiment the plasmonic nanoparticles are inert and adjacent to the material of interest to probe a process occurring in/on this material. In this review we defi ne and discuss these two generic experimental strategies and summarize the growing applications of nanoplasmonic sensors as experimental tools to address materials science-related questions.

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Influence of interparticle interaction on melting of gold nanoparticles in Au/polytetrafluoroethylene nanocomposites

Cited by 17 publications

References 28 publications

Use of Au Nanoparticle-Filled PTFE Films to Produce Low-Friction and Low-Wear Surface Coatings

Use of Au Nanoparticle-Filled PTFE Films to Produce Low-Friction and Low-Wear Surface Coatings

The Influence of Cu Nanoparticles on the Tribological Properties of Polydopamine/PTFE + Cu Films

Nanoplasmonic sensing for nanomaterials science

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