Nanofriction of Graphene/Ionic Liquid-Infused Block Copolymer Homoporous Membranes

An, Rong; Fan, Pengpeng; Yan, Nina; Ji, Qingmin; Goel, Shivani; Wang, Yong

doi:10.1021/acs.langmuir.7b01973

Cited by 8 publications

(3 citation statements)

References 53 publications

(94 reference statements)

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“…It shows that the layer spacing had increased after the compound. With the increase of layer spacing, the force between the unit layers also decreases, so the relative sliding between the layers is more likely to occur, which is conducive to improving the lubrication effect [24].…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Modified Graphene/Muscovite Nanocomposite as a Lubricant Additive: Tribological Performance and Mechanism

Zhao

Lei

et al. 2022

Lubricants

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Modified graphene/muscovite (MGMu) nanocomposite was synthesized with muscovite (Mu) and silane coupling agent modified graphene oxide through a simple hydrothermal method that exhibited excellent dispersion stability in oil. Compared with the base oil sample, the average friction coefficient and wear scar diameter of the MGMu oil sample decreased by 64.4 and 20.0%, respectively, and the microhardness of its wear scar was increased by 16.1%. The MGMu showed better tribological performance than its individual component due to the synergetic effect between the two components. The lubrication mechanism was proposed according to the morphology, chemical composition, and microhardness of the surface of wear scars. MGMu as an oil additive could fill between the friction pairs, cling to some asperities, and occur relative sliding between unit layers, thus playing a role in lubrication. It was found that MGMu would react with the surface of the friction pair during the friction process to generate Fe2O3, SiO2, SiC, and new aluminosilicate, which formed a self-repairing layer with high hardness. This chemically reactive film exhibited a lower shear strength, which made the oil sample containing MGMu have a lower coefficient of friction.

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Section: Characterization Of Materialsmentioning

confidence: 99%

Modified Graphene/Muscovite Nanocomposite as a Lubricant Additive: Tribological Performance and Mechanism

Zhao

Lei

et al. 2022

Lubricants

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“…Here, we report the ionic liquid (IL) functionalization of GO to increase the structural integrity and stability of a GO laminate membrane and its application in ion sieving. ILs are molten salts that can be used to increase d -spacing between graphene nanosheets and to achieve improved dispersion of GO in the solution phase . According to the recent literature, the blending of IL in the graphene membrane demonstrated the modulation of the pore size to achieve selective gas separation. , Nevertheless, such a simple blending approach would result in less stable membranes in the context of water filtration.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Reduced Graphene Oxide Membrane with Enhanced Stability for Water Purification

Zambare

Song

Bhuvana

et al. 2022

ACS Appl. Mater. Interfaces

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There has been a growing interest in water purification by graphene oxide (GO) laminate membranes due to their exceptional hydrophilicity, high throughput, and extraordinary separation performance originating from their two-dimensional and well-defined nanostructure. However, the swelling and stability in an aqueous environment are areas of concern for the GO laminate membranes. Here, a novel methylimidazolium ionic liquid-reduced GO (mimG)-assembled GO laminate membrane (mimG–GO) with remarkable stability was fabricated by a vacuum-assisted strategy for water purification. Methylimidazolium-based ionic liquid-reduced graphene oxide (mimG) was prepared by a facile nucleophilic ring-opening mechanism. Fabricated membranes were thoroughly characterized for stability, structural, permeance, and rejection properties in an aqueous environment. A combination of cationic mimG and GO nanosheets improves membrane stability in the aqueous environment via cation−π interactions and creates nanofluidic channels for facile water transport while yielding significant enhancement in the salt and dye separation performance. The pore size and the number of nanofluidic channels were precisely controlled via material deposition and laminate thickness to remove salts from water. The mimG–GO laminate membrane containing 72.2 mg m–2 deposition showed a permeance of 14.9 LMH bar–1, 50% higher than 9.7 LMH bar–1 of the neat GO laminate membrane, in addition to an increase in Na2SO4 salt rejection from 46.6 to 77.4%, overcoming the flux-rejection trade-off. The mimG–GO laminate membrane also rejected various anionic dyes (i.e., 99.9% for direct red 80 (DR 80), 96.8% for reactive black 5 (RB 5), and 91.4% for methyl orange (MO)). The mimG–GO laminate membrane containing 361.0 mg m–2 deposition showed the highest rejection for Na2SO4 (92.1%) and 99.9% rejection for DR 80, 99.0% rejection for RB 5, and 98.1% rejection for MO dyes keeping a flux of 2.6 LMH bar–1. Partial reduction and covalent grafting of ionic liquid moieties on GO helped to enhance the cation−π interaction between GO laminates, which showed enhanced stability, frictionless water transport, with high salt and dye rejection. Moreover, a simultaneous improvement in water permeance and solute rejection reveals the great potential of ionic liquid-functionalized GO laminate membranes for water-based applications.

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“…8 Biological surfaces in nature have attracted widespread attention because of their unique guiding behaviors for droplets. Examples are lotus leaves, 9 rice leaves, 10 and petals. 11 Droplets slide easily on the micro/nanostructured lotus leaf surfaces, anisotropic structured rice leaf surfaces transport raindrops directionally, and a porous structured petal surface fixes droplets at any oblique angle.…”

Section: Introductionmentioning

confidence: 99%

Self-Adjusting Lubricant-Infused Porous Hydrophobic Sticky Surfaces: Programmable Time Delay Switch for Smart Control of the Drop’s Slide

Yan

Zhang

Sun

et al. 2019

ACS Appl. Mater. Interfaces

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Although strategies for smart control of droplets by utilizing slippery surfaces that are typically made by infusing lubricants into porous surfaces are booming, no surface can smartly control the start or stop of droplet sliding without external environmental stimuli. A strategy for how surfaces alone, if constituted by lubricant-infused porous hydrophobic sticky surfaces (LIPHSS) with a specific interface self-adjusting system, can achieve the target of smart control of a drop’s slide is presented here. The continuous self-adjustment of the interface formed by droplets and LIPHSS leads to the occurrence of droplet sinking behavior. The droplet’s sinking reduces its sliding angle (SA) and thus can trigger the sliding of the droplet deposited on LIPHSS with a tilt base angle between the SA after sinking and the SA before sinking. Furthermore, regulating lubricant layer thickness and tilt base angle is an important way to achieve smart control of the time required to initiate the sliding of the droplet. The uniqueness of the study is focused on the clever extension of the sinking behavior of droplets on LIPHSS to achieve a programmable time delay switch to smart control the sliding of droplets.

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Nanofriction of Graphene/Ionic Liquid-Infused Block Copolymer Homoporous Membranes

Cited by 8 publications

References 53 publications

Modified Graphene/Muscovite Nanocomposite as a Lubricant Additive: Tribological Performance and Mechanism

Modified Graphene/Muscovite Nanocomposite as a Lubricant Additive: Tribological Performance and Mechanism

Ionic Liquid-Reduced Graphene Oxide Membrane with Enhanced Stability for Water Purification

Self-Adjusting Lubricant-Infused Porous Hydrophobic Sticky Surfaces: Programmable Time Delay Switch for Smart Control of the Drop’s Slide

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