Effect of particle weight concentration on the lubrication properties of graphene based epoxy composites

Publication date: November 2019Source: Colloid and Interface Science Communications, Volume 33Author(s): Ram Krishna Upadhyay, Arvind KumarAbstractEpoxy-graphene composites are prepared with varying graphene concentration of 1 wt%, 3 wt%, and 5 wt%. Composite fabrication involves continuous stirring of the mixture consisting graphene and epoxy resin followed by curing first at room temperature and subsequently at 100 °C. In the epoxy-graphene composites, compressive stresses show increasing trend with filler concentration. A correlation between surface roughness and wetting is established to explain the Wenzel's contact model. Friction and wear behavior is evaluated under dry/lubricated contact. The average friction-coefficient values of 5 wt% epoxy-graphene composites range between 0.02 and 0.18, and 0.01–0.09 for dry and lubricated contact, respectively. Wear rate under dry and lubricated contact ranges between 0.95 and 3.15 × 10−7 and 0.67–2.21 × 10−7 mm3/N-m, respectively. Minimum dissipation energy of 5.1 × 102 N-m is obtained for 5 wt% epoxy-graphene composites. Functionalization of graphene and tribofilm formation lead to excellent properties in the prepared composites, and they are suitable for light-weight automotive application.Graphical abstract
Source: Colloids and Interface Science Communications - Category: Nanotechnology Source Type: research

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Abstract Herein, through a facile and energy-friendly approach, thermally stable manganese-derived amorphous stacked nanosheet (MASNS) coatings with controlled wetting property ranging from superhydrophilicity to superhydrophobicity were synthesized. The superhydrophobic MASNS coating exhibited remarkable selectivity and sensitivity in the solid phase microextraction (SPME) of non-polar aromatic analytes, even amid the abundance of polar compounds, due to the superhydrophobic effect and the stacked lamellar structures. The established method was applied to the determination of polycyclic aromatic hydrocarbons (PAH...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research
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Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
LangmuirDOI: 10.1021/acs.langmuir.9b03002
Source: Langmuir - Category: Chemistry Authors: Source Type: research
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Source: Drugs and Therapy Perspectives - Category: Drugs & Pharmacology Source Type: research
In this study, a sessile drop technique was used to investigate the wetting and corrosion behavior of Al2O3 substrate against SiO2–MgO–FeO–CaO–Al2O3 slag, whose composition was determined according to the slag obtained from smelting nickel laterite in the RHF process. The experimental results showed that the slags with basicity ((MgO + CaO)/SiO2) of 0.43 and 0.63 had a low apparent contact angle of approximately 25° and 30°, respectively. It indicated the slag samples could wet well on the Al2O3 substrate. The spreading of slag on the substrate was mainly ascribed to the decrease o...
Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research
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Source: Polymer - Category: Chemistry Source Type: research
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Source: BMC Pediatrics - Category: Pediatrics Authors: Tags: Study protocol Source Type: research
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Source: Current Urology Reports - Category: Urology & Nephrology Source Type: research
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Source: Frontiers in Endocrinology - Category: Endocrinology Source Type: research
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Source: International Braz J Urol - Category: Urology & Nephrology Source Type: research
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