Abstract:Lubrication strategies developed long time ago employed amphiphilic molecular lubricant additives to confer to lubricating oils or greases specific properties such as friction reduction, antiwear, anticorrosion. The understanding of their action and the development of various type of nanoparticles are at the origin of new lubrication strategies using composite or functionalized nanoparticles in dispersion in lubricating oils or greases to confer to the lubricants the needed functions. The present work is conce… Show more
“…Due to these limitations, new strategies have been investigated. They consist in the introduction, in the lubricant base, of nanoparticles of tribo-active phases (MoS 2 , graphite) [11][12][13] or precursors of tribo-active phases (fullerenes, carbon-onions, carbon nanotubes, inorganic fullerenes and nanotubes, …) [14][15][16][17][18][19][20][21][22] subjected to build on the sliding surfaces, in the physical conditions of the sliding interface, the tribofilm without any chemical reactions with the substrates. Additionally, the immediate formation of the tribofilm can be obtained in the case of optimized formulation as far as the tribo-active nanoparticles are expected to instantaneously form the tribologic film in the sliding contact.…”
Section: Introductionmentioning
confidence: 99%
“…The friction reduction process is classically attributed to the weak interactions between the sheets [11]. Recent works realized on new synthesized carbonaceous nanoparticles (fullerenes, carbon-onions, nanotubes, nanofibres) and inorganic fullerenes and nanotubes (IF-MoS 2 , IF-WS 2 ) gave a lot of informations about the friction reduction processes, involving nanotubes or fullerenes delamination and deposition of graphite layers of some nanometres thickness in the contact area [14][15][16][17][18][19][20][21][22].…”
The tribologic properties of carbon nanodiscs and nanocones and their fluorinated derivatives are investigated and correlated to their structure and chemical composition (atomic fluorine/carbon ratio). Two families of products are studied obtained by fluorination of ill ordered and highly graphitized carbon nanodiscs and nanocones. The studies clearly point out that friction properties of the nanoparticles are strongly dependent on the structure of the initial carbonaceous compounds. Better tribologic behaviour is obtained when the initial nanoparticles structure is highly ordered (graphitized particles). In that case, an optimum of fluorination rate is put in evidence.
“…Due to these limitations, new strategies have been investigated. They consist in the introduction, in the lubricant base, of nanoparticles of tribo-active phases (MoS 2 , graphite) [11][12][13] or precursors of tribo-active phases (fullerenes, carbon-onions, carbon nanotubes, inorganic fullerenes and nanotubes, …) [14][15][16][17][18][19][20][21][22] subjected to build on the sliding surfaces, in the physical conditions of the sliding interface, the tribofilm without any chemical reactions with the substrates. Additionally, the immediate formation of the tribofilm can be obtained in the case of optimized formulation as far as the tribo-active nanoparticles are expected to instantaneously form the tribologic film in the sliding contact.…”
Section: Introductionmentioning
confidence: 99%
“…The friction reduction process is classically attributed to the weak interactions between the sheets [11]. Recent works realized on new synthesized carbonaceous nanoparticles (fullerenes, carbon-onions, nanotubes, nanofibres) and inorganic fullerenes and nanotubes (IF-MoS 2 , IF-WS 2 ) gave a lot of informations about the friction reduction processes, involving nanotubes or fullerenes delamination and deposition of graphite layers of some nanometres thickness in the contact area [14][15][16][17][18][19][20][21][22].…”
The tribologic properties of carbon nanodiscs and nanocones and their fluorinated derivatives are investigated and correlated to their structure and chemical composition (atomic fluorine/carbon ratio). Two families of products are studied obtained by fluorination of ill ordered and highly graphitized carbon nanodiscs and nanocones. The studies clearly point out that friction properties of the nanoparticles are strongly dependent on the structure of the initial carbonaceous compounds. Better tribologic behaviour is obtained when the initial nanoparticles structure is highly ordered (graphitized particles). In that case, an optimum of fluorination rate is put in evidence.
“…1 Today, lubricants play an integral role in the operation of several technologies, including internal combustion engines, vehicles, gear systems, compressors, turbines, and hydraulics in addition to smaller scale technologies, including the lubrication of hard disk drives 2 and microelectromechanical systems (MEMs). 3 The main functions of a lubricant are to reduce friction and material wear.…”
We present an exploratory study on a suspension of uniform carbon microspheres as a new class of aqueous-based lubricants. The surfactant-functionalized carbon microspheres (∼0.1 wt %) employ a rolling mechanism similar to ball bearings to provide low friction coefficients (μ ≈ 0.03) and minimize surface wear in shear experiments between various surfaces, even at high loads and high contact pressures. The size range, high monodispersity, and large yield stress of the C(μsphere), as well as the minimal environmental impact, are all desirable characteristics for the use of a C(μsphere)-SDS suspension as an alternative to oil-based lubricants in compatible devices and machinery.
“…Analysis of innovative development of construction technologies and materials demonstrates that the materials and technologies based on nanoscale technology will be in use for the next 10-20 years. [1][2]. Nowadays, the application of nanotechnology composites to enhance functional properties of building materials and products -is a promising new direction in science and science-intensive production.…”
Abstract. New method of quality improvement of the polymer modified binder (PMB) was considered in the paper. Testify to the fact that PMB modified by nanoagent is less sensitive to aging, as a result of the processes of peptization asphaltene-resin complexes (ARC) in the structure of the modified binder and the crosslinking with the polymer matrix. It is demonstrated that the nanotubes, (SWCNT or MWCNT) using as a modifier, have effect of crosslinking agent and the inhibitor of the aging process of a PBB. The influence of nanomodified PBB on strength and deformation properties of asphalt concrete is researched. It is found that the application of modified binder in the asphalt concrete mixtures enhances the water resistance of asphalt concrete, heat resistance, and shear resistance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.