Effects of molecular structures of carbon-based molecules on bio-lubrication

Abstract

The lack of lubrication affects the performance of both natural and artificial joints and often leads to their failure. This research investigates the tribological performance of four carbon-based molecules, phloroglucinol, 1,2-dihydroxynaphthalene, graphene oxide (GO), and diamondoid (diamantane-4,9-dicarboxylic acid), as water-based lubricants against ultra-high-molecular-weight polyethylene (UHMWPE). Results showed friction reduction for all lubricants and GO performed the best. Molecular dynamics simulations indicated that GO flakes were prone to be adsorbed on the surface. The mending effect was dominant for the rest molecules that is less effective in lowering friction.

Ionic Grease Lubricants: Protic [Triethanolamine][Oleic Acid] and Aprotic [Choline][Oleic Acid]

“…To the best of our knowledge, most if not all of the existing lubricating greases require the addition of thickener in the base oil, ,, which increases the manufacturing cost, decreases the biodegradability, and degrades certain lubrication properties. Because extra additives would pose potential contamination to certain applications such as microelectromechanical system (MEMs), artificial knee joints, and food and pharmaceutical industry, , green and biocompatible grease lubricants and self-lubrication composites − are attracting ever increasing interest simply because they can avoid health hazards and product contamination and minimize the environmental impact caused by traditional synthetic and mineral greases. Compared with existing lubricating greases, the major advantage of ionic greases is the extraordinary capability to interact with metal surfaces and form robust tribo-films at the friction interface, attributed to their strong polar nature.…”

Influence of Surface Texturing on the Dry Tribological Properties of Polymers in Medical Devices

“…A reduction in friction at the interface between a pair of moving surfaces can serve to reduce wear. Besides changing material combinations, the use of liquid or solid lubricants and modifying surface contact areas are ways to provide alternative options for reducing friction in medical devices [8][9][10][11]. Surface modification techniques can alter the texture of a contact surface through mechanical or chemical processes, and modifications can be in a form of material transfer, coatings or material loss which will affect the subsequent wear mechanisms and rates [12].…”

o-Iodoxybenzoic Acid-Initiated One-Pot Synthesis of 4-Arylthio-1,2-naphthoquinones, 4-Arylthio-1,2-diacetoxynaphthalenes, and 5-Arylthio-/5-Aminobenzo[a]phenazines

“…The derivatives of 1,2-naphthoquinones, 1,2-naphthalenediols, and phenazines are widely distributed in a variety of natural products and organic functional materials. − Furthermore,1,2-naphthoquinone derivatives have been enormously explored for a range of biological activities , such as antidiabetic, anti-inflammatory, , neuroprotection, , anticancer, , phosphatase inhibition, etc. (Figure ).…”

“…(Figure ). The applications of 1,2-naphthoquinones, 1,2-diacetoxynaphthalenes, and benzo­[ a ]­phenazine derivatives derived therefrom have led to simplification of the synthetic procedures to access them. − …”