Ambient energy dispersion and long-term stabilisation of large graphene sheets from graphite using a surface energy matched ionic liquid†

Freeman, Justin S.; Goloviznina, Kateryna; Li, Hua; Saunders, Martin; Warr, Gregory G.; Pádua, Agı́lio A. H.

doi:10.1016/j.jil.2021.100001

Cited by 7 publications

(5 citation statements)

References 109 publications

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“…3), most likely due to the FLG flakes restacking, leading to more than 50% sedimentation in a week and almost 100% in 2 months. In theory, surfactants are expected to prevent restacking by making flakes-medium interaction more attractive than the weak van der Waals forces between FLG sheets [16,45,46,53,54]. In our experiments we have seen that surfactants drastically improve the stability (57% in 3 months) of the FLG suspension compared to those prepared in DIW.…”

Section: Stabilisation Role Of Ethanolmentioning

confidence: 58%

Effects of Green Solvents and Surfactants on the Characteristics of Few-Layer Graphene Produced by Dual-Frequency Ultrasonic Liquid Phase Exfoliation Technique

et al. 2022

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Section: Stabilisation Role Of Ethanolmentioning

confidence: 58%

Effects of Green Solvents and Surfactants on the Characteristics of Few-Layer Graphene Produced by Dual-Frequency Ultrasonic Liquid Phase Exfoliation Technique

et al. 2022

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“…The studies all show that ionic liquid has excellent lubrication performance as lubricating oil. Ionic liquids also have good electrical conductivity and contain a wide range of ion and anion structures, which can be used for surface coating and modi cation of nanomaterials to improve their performance in lubricating oil [27][28][29][30][31][32][33]. Xia Yanqiu et al [27][28][29][30] used lithium tetra uoroborate (LiBF4) and lithium hexa uorophoric acid (LiPF6) as additives to form ionic liquid in situ and made conductive grease with this as the base oil, showing good electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the electrical conductivity and tribological properties of the high base value calcium sulfonate compound grease containing 2% LiBF4 were signi cantly better than those of the commercial electric compound grease. Justin S. Foreman et al [31] con rmed that 1-ethyl-3methylimidazole acetate (EMIM Ac) ionic liquid could improve the stability of Graphite and graphene sheets by using energy dispersive X-ray spectral images. They believed that the Graphite and graphene sheets in EMIM Ac were positively charged, leading to electrostatic repulsion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Nano Graphite on Conductivity and Lubrication of Environment-Friendly Lithium Grease

Xia

Yang

Jia

et al. 2023

Preprint

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An environment-friendly lithium complex grease was prepared using pentaerythritol ester as base oil, lithium compound soap as thickener, and Graphite modified by ionic liquid of different chain lengths as a lubricating additive. The dropping point, corrosion of the grease, and volume resistance were tested. MFT-R4000 high-speed reciprocating friction and wear tester was used to measure the tribological properties under current-carrying and non-carrying currents. A scanning electron microscope (SEM) and photoelectron spectroscopy (XPS) were used to observe the surface of the wear scar. The results show that the polyether base oil OSP680 grease has the best degradation ability and the strongest environmental protection ability. The modified nano-Graphite material can improve the wear resistance of the base grease and the conductivity of the base grease. Ionic liquid has a synergistic effect with nano-Graphite.

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“…Among ILs, the ones with surface energies matched to the graphite substrate proved to be more effective, as they could exfoliate graphite into 2D graphene under ambient conditions, without requiring any form of external energy input . Moreover, delaminated graphene nanosheets were stabilized in IL dispersions solely by choosing the appropriate composition of ILs. , …”

mentioning

confidence: 99%

“… 42 Moreover, delaminated graphene nanosheets were stabilized in IL dispersions solely by choosing the appropriate composition of ILs. 43 , 44 …”

mentioning

confidence: 99%

Delamination of Layered Double Hydroxide in Ionic Liquids under Ambient Conditions

Takács

Varga

Csapó

et al. 2022

J. Phys. Chem. Lett.

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Liquid phase delamination of layered materials into single-or few-layer nanosheets leads to stable nanoscale dispersions of 2D materials. The delamination of layered double hydroxide (LDH) to double hydroxide nanosheets was studied in two ionic liquids (ILs): ethylammonium nitrate (EAN) and 1-butyl-3-methylimidazolium thiocyanate (BMIMSCN). The as-prepared lamellar structure of LDH disappeared upon dispersing it in ILs due to delamination into 2D nanosheets confirmed by X-ray scattering and diffraction techniques and further evaluated by height profile assessment of the nanoparticles by atomic force microscopy. The results showed that both the thickness and lateral size of the dispersed particles decreased in the IL-based samples, indicating that cleavage of the LDH materials can be observed in addition to delamination. The findings prove the concept of delamination of layered materials by ILs under ambient conditions�an excellent way to prepare 2D double hydroxide nanosheet dispersions in one step using nonvolatile green solvents.

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Ambient energy dispersion and long-term stabilisation of large graphene sheets from graphite using a surface energy matched ionic liquid†

Cited by 7 publications

References 109 publications

Effects of Green Solvents and Surfactants on the Characteristics of Few-Layer Graphene Produced by Dual-Frequency Ultrasonic Liquid Phase Exfoliation Technique

Effects of Green Solvents and Surfactants on the Characteristics of Few-Layer Graphene Produced by Dual-Frequency Ultrasonic Liquid Phase Exfoliation Technique

Effect of Modified Nano Graphite on Conductivity and Lubrication of Environment-Friendly Lithium Grease

Delamination of Layered Double Hydroxide in Ionic Liquids under Ambient Conditions

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