Abstract
Considering the excellent solubility of pyrrolidone ring organic compounds, the synthesized N-(trimethoxysilyl) propyl-N-methyl-2-pyrrolidone chlorides was tethered onto titanium dioxide (TiO2) nanoparticles to improve dispersion of TiO2, and then polyethylene oxide (PEO) oligomer through ion exchange embraced the tethered TiO2 to obtain a novel self-suspended hairy TiO2 nanomaterials without any solvent. A variety of techniques were carried out to illustrate the structure and properties of the self-suspended hairy TiO2 nanomaterials. It was found that TiO2 nanoparticles embody monodispersity in the hybrid system though the “false reunion” phenomenon occurring due to nonpermanent weak physical cross-linking. Remarkably, self-suspended hairy TiO2 nanomaterials exhibit lower viscosity, facilitating maneuverable and outstanding antifriction and wear resistance properties, due to the synergistic lubricating effect between spontaneously forming lubricating film and nano-lubrication of TiO2 cores, overcoming the deficiency of both solid and liquid lubricants. This make them promising candidates for the micro-electromechanic/nano-electromechanic systems (MEMS/NEMS).
Highlights
With the rapid development of nanotechnology, the moving interface gap of micro-/nano-electromechanical systems and magnetic recording system has been reduced to nanometers for achieving more components on per unit, faster response speed and better and more properties
Considering the excellent solubility of pyrrolidone ring organic compounds, the synthesized N(trimethoxysilyl) propyl-N-methyl-2-pyrrolidone chlorides was tethered onto titanium dioxide (TiO2) nanoparticles to improve dispersion of TiO2, and polyethylene oxide (PEO) oligomer through ion exchange embraced the tethered TiO2 to obtain a novel self-suspended hairy TiO2 nanomaterials without any solvent
Based on the chemical bonding theory, the synthetic functionalized ionic liquids contain two different chemical functional groups, of which one can react with silanol groups on the surface of the inorganic material and the other can further participate in other reactions, so that the two kinds of materials with very different properties can be ‘‘coupled’’ together
Summary
With the rapid development of nanotechnology, the moving interface gap of micro-/nano-electromechanical systems and magnetic recording system has been reduced to nanometers for achieving more components on per unit, faster response speed and better and more properties. Solid inorganic or liquid organic materials are the traditional lubricants for controlling friction and wear, e.g., natural and synthetic organics (animal fat, vegetable oil, refined oil, silicone oil, esters, etc.), micro-/nanometal oxide powder (MoS2, ZnO, etc.) and carbon materials. Solid lubricants are usually added into the lube base oil to reduce the interfacial friction and improve the load-bearing capacity of the parts by their benign extreme pressure grease, anti-oxide, anti-wear roles and so on. Compared with the solid lubricants, liquid lubricants show different advantages, such as long-term endurance, low mechanical noise, promotion of thermal conductance and very low friction in the elastohydrodynamic film regime (Zheng et al 2016). Liquid lubricants can be directly used as lubricant without the base oil, but their ability to bear the wear resistance decreases due to the absence of solid nanoparticles (Guo et al 2006)
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