Effect of Water Incorporation on the Lubrication Characteristics of Synthetic Oils

Effect of Polymer Removal on the Morphology and Phase of the Nanoparticles in All-Inorganic Heterostructures Synthesized via Two-Step Polymer Infiltration

“…The efficiency of the infiltration was analyzed with the Quartz Crystal Microbalance technique [ 35 , 36 , 37 , 48 ] previously used for precise monitoring of surface modifications upon exposure to different liquids and thermal treatment processes. In short, changes in the resonant frequency of oscillations of AT-cut QCM crystals (with initial resonant frequency ~ 5 MHz) with ~200 nm thick uniform BCP films spin-coated on the titanium electrodes were monitored during different stages of the BCP exposure to swelling, SBI, and SIS.…”

“…Iron oxide/alumina heterostructures were formed using the approach previously utilized to synthesize PdO x NPs uniformly distributed in the alumina matrix [ 16 ]. The approach involves infiltration of the functional material precursor via swelling-based infiltration (SBI) step in solution followed by vapor-phase infiltration of the alumina matrix precursor via SIS [ 16 , 35 , 36 , 37 ]. We demonstrate that thermal and plasma oxidative treatments result in iron oxide nanoparticles with either solid or hollow morphologies with different magnetic properties.…”

Impact of water on the lubricating properties of hexadecane at the nanoscale

“…14,19 Water can impede the formation of an effective lubricating and protective layer between the sliding surfaces. 17,[20][21][22] Since the thickness of the lubrication film can be as thin as a few nanometers, 23 even trace quantities of water may be detrimental, resulting in increased friction and damage to the moving parts.…”

“…Water can bind to the oxygen groups of both the main lubricant molecules and additives. 17,[20][21][22] Aside from displacing organic compounds, 24 water adsorption can lead to the formation of free-radicals which affect the tribochemistry of the interface, in particular for systems involving metal oxides 20 lubricated by alkane-based products. 14 A broad spectrum of fluid lubricant formulations are currently based on alkanes, 14,[25][26][27][28][29] but a full understanding of the impact of humidity on lubricated friction is still elusive due to nanoscale nature of the problem: the adsorption of water molecules and the subsequent impact on lubrication are processes difficult to observe in situ, at the molecular level, in a controlled environment (humidity, temperature), all while tracking the system's evolution over relevant periods of time.…”

Robust Superhydrophobic Membrane for Solving Water-Accelerated Fatigue of ZDDP-Containing Lubricating Oils

“…Such oil-removing materials have attracted extensive interest for environmental protection. In the lubricating oil industry, through chemical reactions, heat exchangers, absorption, and condensation, the sneaked water as a pollutant would decrease lubricating performance and pose a great hidden danger in operation. − From the view of resource recovery and operation safety, there is an urgent need to remove water from lubricating oils via a facile, energy-saving, and low-cost approach. However, it remains a challenge to solve water-accelerated fatigue of lubricating oils using superhydrophobic membranes.…”