Edge Oleylaminated Graphene as Ultra-Stable Lubricant Additive for Friction and Wear Reduction

Abstract

Graphene has caught growing interest in the field of lubricant additives for its lubricating and antifraying effect. However, the critical agglomeration and sedimentation of graphene particles strongly impede its industrial applications. Here, we proposed a facile way to massively prepare edge-oleylaminated graphene (EOG) via ball milling method. The EOG was well dispersed in lubricant and showed longer than 8 months stability for its extremely thin structures and strong affinity with lubricant. The viscosity index (VI) of base lubricant was greatly improved from 81 to 119 by adding an optimized EOG amount of 0.1 wt.%. Besides, the wear scar diameter (WSD) decreased from 0.88 to 0.46 mm, while the maximum nonseizure load (P B) and the sintering load (P D) increased 64.86% and 56.18%, respectively. The enhanced VI indicates EOG additive could upgrade the base oil from normal grade to special grade. The obvious improvement of wear resistance and load-carrying capacity demonstrates EOG is an ultrastable and effective additive for specific lubricants.

Synergism of Carbon Nanotubes and Graphene Nanoplates in Improving Underwater Sound Absorption Stability under High Pressure

“…[16] The 2D GNPs have become the most promising candidate among these carbon materials. [17] With smaller size than the sound wavelength, these materials can influence the sound wave by blocking, absorbing, or bending these waves. [18] The optimal sound absorption coefficient of the nanocomposites was achieved as the graphene nanoplatelets (GNPs) content was 10 phr, and the average sound absorption coefficient was improved from 0.35 to 0.73 -an increase of nearly onefold.…”

Conductive In Situ Reduced Graphene Oxide–Silk Fibroin Bionanocomposites

“…GO is a form of graphene having various oxygen-containing functional groups, induces stable dispersion in many polar and nonpolar substances, including water, and is thus widely used in many industrial applications for benefits different from those of native graphene. − Because of the presence of oxygen-containing functional groups, graphene oxide has good thermal, electrical, and mechanical properties − due to its 2D sp 2 carbon honeycomb structure. It is well reported in the literature that the functional groups can be removed to obtain stable graphene, which is called reduced graphene oxide (often abbreviated to rGO). , Few studies have documented the composite of a graphene oxide hybrid that can be used as a bifunctional catalyst for hydrogen evolution and hydrogen storage, asymmetric supercapacitors, , electrochemical supercapacitors, self-healing polymer composites, as anode material for lithium-ion batteries, EMI shielding, − and in graphene and graphene oxide-based membranes for gas separation. , Also, graphene nanofillers were synthesized and incorporated into starch to improve its mechanical properties and long-term stability . The present report demonstrates SF as a biomaterial that can be used to reduce GO to rGO and fabricate the SF–rGO bionanocomposite.…”

Unprecedented enhancement of wear resistance for epoxy-resin graphene composites

“…[33][34][35] The tremendous discrepancy between in-plane and off-plane modulus makes graphene potentially possess the leadership in the field of wear resistance. 36 Superlubricity has been realized by graphene at a nanoscale, microscale and macroscale. [37][38][39][40] Nonetheless, the wear resistance was enhanced by 1.4, 2, 7.6, 12.6 and 12.8 times through adding graphene nanoplatelets (GNPs), 22 graphene oxide (GO), 22 graphene, 41 functionalized GO 42 and amino-treated graphene (rGO) 43 , respectively.…”