Slippery Polymer Monoliths: Surface Functionalization with Ordered MoS2 Microparticle Arrays

TL;DR

This paper presents a novel method to enhance the self-lubricating properties of polymer monoliths by integrating ordered arrays of MoS2 microparticles, overcoming issues of traditional coatings such as poor adhesion and delamination.

Contribution

The study introduces a scalable process to synthesize and transfer ordered MoS2 microparticle arrays onto polymer surfaces, significantly improving their sliding capabilities.

Findings

Enhanced sliding performance of polymer monoliths with MoS2 microparticle arrays.

Successful large-scale transfer of ordered MoS2 arrays onto polymers.

Demonstrated potential for durable, self-lubricating surface coatings.

Abstract

Components of technical systems and devices often require self-lubricating properties, which are implemented by means of dry lubricants. However, continuous lubricant coatings on the components' surfaces often suffer from poor adhesion, delamination and crack propagation. The replacement of continuous coatings with dense ordered arrays of microparticles consisting of dry lubricants may overcome these drawbacks. Using the well-established solid lubricant MoS2 as model system, we demonstrate that the sliding capability of polymeric monoliths can be significantly enhanced by integration of arrays of micron-sized dry lubricant microparticles into their contact surfaces. To synthesize the MoS2 microparticle arrays, we first prepared ordered hexagonal arrays of ammonium tetrathiomolybdate (ATM) microparticles on Si wafers by molding against poly(dimethylsiloxane) templates followed by high-temperature conversion of the ATM microparticles into MoS2 microparticles under Ar/H2 atmosphere in the presence of elemental sulfur. Finally, the obtained large-scale hexagonal MoS2 microparticle arrays were transferred to the surfaces of polymer monoliths under conservation of the array ordering. Self-lubrication of components of technical systems by incorporation of dry lubricant microparticle arrays into their contact surfaces is an example for overcoming the drawbacks of continuous functional coatings by replacing them with microparticle arrays.