Ionic Nitrogen-Doped Carbon Dots as Nonpolar Lubricant Additives at Low Effective Addition

Langmuir, Journal Year: 2024, Volume and Issue: 40(24), P. 12632 - 12640

Published: June 4, 2024

The poor compatibility with nonpolar lubricant still hinders the application of carbon dots (CDs) in lubrication. In addition, research proves that existence ionic structure and active groups on CDs are conducive to their lubricity. order obtain structures good oil synchronously, a kind nitrogen-doped (NCDs) was synthesized via alkylation nitrogen NCDs anion exchange. new material could exhibit tribological performance as poly alpha olefins (PAO4) additives low addition. Moreover, an liquid, [N44HH][DEHP], same chosen comparison investigate role NCD cations. surface analyses demonstrate cations phosphate ester anions adsorb friction interface play synergistic lubrication during process, which generate superior carbon-based tribofilm.

Language: Английский

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Dynamic Directional Ultrasonically In Situ-Generated N,S-Codoped Carbon Dots in Poly(ethylene glycol) for Improved Tribological Performance

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(30), P. 39896 - 39905

Published: July 16, 2024

The dispersion stability of nanomaterials in lubricants significantly influences tribological performance, yet their addition as lubricant additives often presents challenges secondary dispersion. Here, we present a straightforward method for situ preparation N,S-codoped CDs (N,S-CDs)-based using heterocyclic aromatic hydrocarbons containing N/S elements poly(ethylene glycol) (PEG) base oil by directional ultrasound strategy. Two types N,S-CDs were successfully prepared via the treatment PEG with benzothiazole (BTA) and benzothiadiazole (BTH) separately. resultant have uniform distribution N S maintain good colloidal even after 9 months storage. can enter surface gap friction pairs then induce tribochemical reaction. Benefiting from synergistic effect activating elements, robust stable protective film consisting iron sulfides, oxides, carbon nitrides, amorphous carbonaceous compounds is formed, thus endowing N,S-CDs-based improved antiwear friction-reducing performance. Compared pure PEG, coefficient (COF) N,S-CDs(BTH)-based decreased to 0.108 0.292, accompanied 91.2% reduction wear volume, maximum load carrying capacity increased 450 150 N.

Language: Английский

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Liquid Metal-Based Supramolecular Oleogel Lubricants Constructed by Dynamic Disulfide and Hydrogen Bonds for Antiwear and Friction Reduction

Chemistry of Materials, Journal Year: 2024, Volume and Issue: 36(10), P. 5110 - 5119

Published: May 14, 2024

Supramolecular oleogel is a promising lubricant, showing satisfactory lubrication performance and excellent stability. In this work, series of gallium-based liquid metal (GLM)-based nano-oleogels were prepared by combining alkylthiol self-assembled GLM nanodroplets (C12@GLM) α-lipoic acid ester-based dynamic covalently linked supramolecular gels. The disulfide bonds not only facilitate the formation dense gel networks but also hinder sedimentation nanoparticles forming coordinate with C12@GLM, thereby conferring great dispersion stability (more than 2 months). superior friction wear reduction [email protected] was observed, coefficient decreased to 0.108 from 0.216, volume loss reduced 73.04%, load carrying capacity increased 50 550 N, compared base oil. conjunction shear thinning creep recovery rheological properties nano-oleogels, mechanism studies revealed that are disrupted under shear, releasing oil nanoparticles. lubricating film assisted synergistic action nanoadditives lubricants, tribochemical reaction consisting iron oxides sulfides, along nanodroplets.

Language: Английский

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Functionalized N-doped carbon nanosheets derived from metal−organic framework as oil-based lubricant additives for improved tribological performance

Tribology International, Journal Year: 2024, Volume and Issue: 197, P. 109795 - 109795

Published: May 19, 2024

Language: Английский

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Fabrication of ionic liquid-functionalized carbon dots as lubricant additive for friction and wear reduction

Tribology International, Journal Year: 2024, Volume and Issue: 201, P. 110227 - 110227

Published: Sept. 10, 2024

Language: Английский

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Fabrication of DDP-functionalized carbon nitride nanosheets via thiol-ene “click” reaction as lubricant additives

Tribology International, Journal Year: 2024, Volume and Issue: 195, P. 109662 - 109662

Published: April 10, 2024

Language: Английский

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Fabrication of N/P-Codoped Carbon dots with Anti-bacterial Activity for Enhanced Aqueous Lubrication Performance

Carbon, Journal Year: 2024, Volume and Issue: 230, P. 119578 - 119578

Published: Aug. 28, 2024

Language: Английский

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Fabrication of Dialkyl Dithiophosphate-Functionalized Carbon Aerogel Microspheres for Enhanced Lubrication Performance

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Herein, functionalized carbon aerogel microspheres (CAMs) were successfully prepared by the pyrolysis of resorcinol-formaldehyde (RF) followed surface modification. First, RF carbonized to obtain CAMs. Afterward, polyphenolic compound epigallocatechin gallate (EGCG) was reacted with melamine form a poly(EGCG) layer onto CAM surface, bonding antiwear molecule dialkyl dithiophosphate (DDP) Michael addition, resulting in DDP-functionalized CAMs (DDP-CAMs). The grafting DDP improved lipophilicity CAMs, enabling stable dispersion base oil 500SN for over 10 days while also enhancing their antifriction and properties. addition 1.0 wt % DDP-CAMs resulted 34.7% reduction coefficient friction 47.5% decrease wear volume. enhanced lubrication performance can be attributed synergistic effect. On one hand, protective film generated through tribo-chemical reactions. At same time, present at contact interface exhibited nanoscale rolling self-repairing

Language: Английский

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Fabrication of Garlic Oil-Functionalized Onion-Like Carbon Nanoparticles as Effective Nanoadditives for Improved Lubricating Performance

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(12), P. 14443 - 14451

Published: June 13, 2024

Herein, garlic oil-functionalized onion-like carbon (OLC) nanoparticles were successfully prepared through a multistep process involving the carbonization of candle ash followed by surface modification. Initially, OLC was heat-treating under 450 °C and then grafting polyethylenimine (PEI) using epigallocatechin gallate (EGCG) as cross-linking agent. Subsequently, oil grafted onto PEI@OLC via aza-Michael reaction with PEI, thereby obtaining (GO@OLC). The GO@OLC exhibited enhanced lubrication properties lube additive, low coefficient friction (COF) 0.11 significant reduction 76.57% in wear volume. performance is credited to rolling effect repairing well formation complex protective layer GO@OLC-induced tribochemical reactions.

Language: Английский

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Enhanced lubrication and photothermal conversion via dynamically reversible supramolecular oil gels filled with MXene@mGLM composites

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(31), P. 20025 - 20034

Published: Jan. 1, 2024

Preparation of dynamic reversible supramolecular oil gels filled with MXene@ m GLM composites, which exhibit good lubrication properties and photothermal conversion properties.

Language: Английский

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