Engineering Graphene Wrinkles for Large Enhancement of Interlaminar Friction Enabled Damping Capability

Abstract

Graphene nanoplates are hoped-for solid lubricants to reduce friction and energy dissipation in micro-and nano-scale devices benefiting from their interface slips to reach an expected superlubricity. On the contrary, we propose here by introducing engineered wrinkles of graphene nanoplates to exploit and optimize the interfacial energy dissipation mechanisms between the nanoplates in graphene-based composites for enhanced vibration damping performance.Polyurethane (PU) beams with designed sandwich structures have been successfully fabricated to activate the interlaminar slips of wrinkled graphene-graphene, which significantly contribute to the dissipation of vibration energy. These engineered composite materials with extremely low graphene content (~0.08wt%) yield a significant increase of quasi-static and dynamic damping compared to the baseline PU beams (by 71% and 94%, respectively). Friction force images of wrinkled graphene 2 / 33 oxide (GO) nanoplates detected via Atomic Force Microscope (AFM) indicate that wrinkles with large coefficients of friction (COFs) indeed play a dominant role in delaying slip occurrences.Reduction of GO further enhances the COFs of the interacting wrinkles by 7.8% owing to the increased effective contact area and adhesive force. This work provides a new insight on how to design graphene-based composites with optimized damping properties from the microstructure perspective.

Shining Light on Porous Liquids: From Fundamentals to Syntheses, Applications and Future Challenges

“…The last potential application of PLs is used as the filler phase in polymer-based composite to enhance the damping properties. [264][265][266][267][268][269] As we all know, damping performance is an important aspect for materials under mechanical vibration, high-speed shock, and cyclic loading. It can evaluate energy absorption and dissipation.…”

Engineering foam skeletons with multilayered graphene oxide coatings for enhanced energy dissipation

“…The O2 plasma treatment applied here has a double function. On the one hand, the treatment hydrophilizes the to-be coated foams with oxygen-contained groups so that, the inks or the water-based PUD can be easily absorbed into the foams due to improved wettablility; on the other hand, the treatment can also strengthen the adhesion of the coating interface by forming chemical bonds with the assistance of silane coupling agents (KH-550) [11,24]. The vacuum and application of constant pressure are exerted here to provide close contact between the base material and the coating solutions (including GO ink and water-based PUD).…”

“…The vacuum and application of constant pressure are exerted here to provide close contact between the base material and the coating solutions (including GO ink and water-based PUD). The GO inks were prepared based on our previous work [24] and the as-prepared GO nanoplatelets (Figure 1b, c) are ~10 µm in lateral size and ~6 nm in thickness. XRD and XPS characterizations (Fig.…”

“…The GO coating and PU surface are identified with Raman spectroscopy analysis as GO coating reveals the typical D and G peaks while PU shows its intrinsic characteristic peaks (Fig. S3) [24,25]. A more pronounced and continuous deposition of GO gradually appears on the strut surface with increasing coating ink concentrations.…”

“…Apart from the preparation of the quality GO ink solutions based on our previous work that produce inks with desired viscosity (Fig. S4) [24], another crucial point is the use of a centrifugation process that ensures even coatings (Fig. S5).…”