This work studied the development of vegetable based lubricants and the addition of oxides nanoparticles (ZnO and CuO) as additive for extreme pressure (EP), exploring the EP and oil base influence in tribological behavior. The results showed that with the addition of nanoparticles to conventional lubricant, the tribological properties can be significantly improved. A smoother and more compact ...

Dry eye disease (also called keratoconjunctivitis sicca) is a common condition, with a prevalence ranging from 8 to 34%, depending on the criteria used. It becomes more common with increasing age and affects more women than men. Artificial tears and ocular lubricants are considered the mainstay of treatment, and there is a very wide range of these products available. In England in 2014, over 6....

General characteristics of waxes, adhesives and lubricants as well as the recent fundamental investigations on their physical and mechanical behaviour are introduced. The current R&D status for new type/generation of waxes, adhesives and lubricants from natural products is reviewed, with an emphasis on their tribological applications. In particular, some crucial issues and challenges relating t...

A series of novel green lubricants with dissolved lignin in [choline][amino acid] ([CH][AA]) ionic liquids (ILs) have been synthesized in this work. The effect of lignin on the thermal and tribological properties of the lignin/[CH][AA] lubricants was systematically investigated by means of thermogravimetric analysis, differential scanning calorimetry, and a friction and wear tester. The lignin ...

OBJECTIVE Over-the-counter vaginal lubricants have been shown to negatively affect in vitro sperm motility. The objective of this study was to estimate the effect of vaginal lubricant use during procreative intercourse on natural fertility. METHODS Women aged 30-44 years with no history of infertility who had been trying to conceive for less than 3 months completed a baseline questionnaire on...

The results obtained using several analysis techniques have provided varying levels of evidence of differences between the lubricants and loads that have been tested for comparison in this study. Analysis of the friction alone has shown a significant difference between loads, but no significant differences resulting among the different lubricants used. The comparison of total changes in displac...

T R I B O L O G Y & L U B R I C A T I O N T E C H N O L O G Y W W W . S T L E . O R G nterest in the use of biodegradable lubricants continues as more emphasis is placed on using fluids that are derived from sustainable raw materials. One area of concern with current biodegradable lubricants is inferior performance compared to synthetic lubricants, particularly from the standpoint of oxidation ...

Industrial revolution transformed the lives of human by shifting the muscle power to machines. Machine utilizes fuel for developing power and motion. Relative motion amongst the machine parts makes them susceptible to frequent wear and tear. Lubricants act as an antifriction media, facilitating smoother working, reducing the risks of undesirable frequent failures and maintaining reliable machin...

Vegetable oils are promising candidates as base fluid for eco-friendly lubricants because of their excellent lubricity, biodegradability, viscosity–temperature characteristics and low volatility. Their use, however, is restricted due to low thermo-oxidative stability and poor cold flow behavior. This paper presents a systematic approach to improve the oxidation behavior and low temperature flui...