Liquid-phase exfoliated fluorographene as a two dimensional coating filler for enhanced corrosion protection performance

Yang, Zhong-Jian; Sun, Wen; Wang, Lida; Li, Sijia; Zhu, Tianzhen; Liu, Guichang

doi:10.1016/j.corsci.2015.10.039

Cited by 100 publications

(18 citation statements)

References 32 publications

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“…Consistent with the principles of green chemistry, material synthesis and processing should avoid caustic reagents and nonaqueous solvents. Fluorographite and fluorographene materials are widely used in various applications like corrosion-resistant coatings, thermoelectric devices, supercapacitors, biosensing, solar cells, organic field-effect transistors, , and high-performance cathode materials . All of these materials start with graphite or fluorographite and require nonaqueous synthetic methods or use solvents like N , N -dimethylformamide (DMF), N -methyl-2-pyrrolidone, or toluene to facilitate oxidation or exfoliation.…”

Section: Introductionmentioning

confidence: 99%

Fluorographite Nanoplatelets with Covalent Grafting of Anion-Exchange Resins for Water Purification

Sahu

Carlin

Craps

et al. 2022

ACS Appl. Nano Mater.

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We have developed a novel green synthetic method to covalently graft fluorographite (FGi) nanoplatelets, with quaternary ammonium polyelectrolyte chains under mild reaction conditions in water. Radical centers on the fluorographite layers react with the radical chain end on short strands of anion-exchange resins. While fluorographite is superhydrophobic, we show that the polymer radical chain end is necessary to initiate defluorination and delamination of the FGi in neutral pH water, without any pretreatment or caustic reagents. Scanning electron microscopy of thin films shows continuous and organized stacking of ellipsoidal nanoplatelets across large defect-free areas. We show that these new materials are highly effective at removing known and emerging contaminants to below environmentally relevant concentrations. Electron microscopy, vibrational spectroscopy, elemental analysis, and thermal analysis data are presented, and they are consistent with defluorination, partial exfoliation, and graphitization during the aqueous polymer grafting reaction. A radical-initiated mechanism is proposed that is consistent with the observed defluorination and oxidation of FGi nanoplatelets. The physicochemical properties, water flux, and morphology of these thin-film assemblies are described in detail. Thin membranes of polymer-functionalized fluorographite removed 99% of perfluorooctanoic acid to below 100 parts per trillion while maintaining a very high water flux over 1100 L h–1 m–2 bar–1. Percent removal of perfluorinated alkyl substances and heavy metal oxyanions versus polyelectrolyte-functionalized fluorographite membrane areal density is reported. The methodology presented in this study is a facile approach toward developing high-performance materials for sustainable and green applications.

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Section: Introductionmentioning

confidence: 99%

Fluorographite Nanoplatelets with Covalent Grafting of Anion-Exchange Resins for Water Purification

Sahu

Carlin

Craps

et al. 2022

ACS Appl. Nano Mater.

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“…Since corrosion is an age-old problem, several mitigation strategies have been investigated and adopted with different degrees of success. The use of graphene as an ultra-thin coating has emerged as a novel and exciting approach to the corrosion protection [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. The remarkable properties of graphene include its very high charge carrier mobility [ 17 , 18 ], high optical transparency (97.7%) [ 19 ], flexibility (spring constant 1–5 N/m) [ 20 ], a breaking strength 100 times greater than the strongest steel with a tensile modulus (stiffness) of 1 TPa [ 21 ], scratch resistance [ 22 ], record electrical conductivity [ 23 ], the highest current density (million times that of Cu) [ 24 ] and thermal conductivity of (4.84 ± 0.44) × 10 3 to (5.30 ± 0.48) × 10 3 Wm −1 K −1 (outperforming diamond) [ 25 ], impermeability even to the smallest atomic size gas (i.e., He) [ 26 ], and chemical inertness [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Durable Corrosion Resistance of Copper Due to Multi-Layer Graphene

Tiwari

Singh

2017

Materials

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Ultra-thin graphene coating has been reported to provide considerable resistance against corrosion during short-term exposures, however, there is great variability in the corrosion resistance due to graphene coating in different studies. It may be possible to overcome the problem of hampered corrosion protection ability of graphene that is caused due to defective single layer graphene by applying multilayer graphene. Systematic electrochemical characterization showed that the multilayer graphene coating developed in the study provided significant corrosion resistance in a chloride solution and the corrosion resistance was sustained for long durations (~400 h), which is attributed to the multilayer graphene.

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“…Fluorinated graphene is promising to enhance the anti‐corrosion performance for the insulating nature induced by F doping, as well as the molecule impermeability inherited from graphene. [ 10 ] An alternative to suppressing the corrosion rate is to design microstructures that are intrinsically electrochemically homogeneous (for example, dispersing the second phases through severe plastic deformation engineering [ 11 ] ). However, the combination of these two approaches loses effectiveness since the composites reinforced by fluorinated graphene are susceptible to weak interfacial bonding and low load‐bearing capacity due to the chemical inertness of this modified graphene.…”

Section: Introductionmentioning

confidence: 99%

Heteroatom Modification Enhances Corrosion Durability in High‐Mechanical‐Performance Graphene‐Reinforced Aluminum Matrix Composites

et al. 2022

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The antagonism between strength and corrosion resistance in graphene‐reinforced aluminum matrix composites is an inherent challenge to designing reliable structural components. Heteroatom microstructural modification is highly appreciated to conquer the obstacle. Here, a bottom‐up strategy to exploit the heterogeneous phase interface to enable high corrosion durability is proposed. Deformation‐driven metallurgy derived from severe plastic deformation is developed to produce Mg‐alloyed fluorinated graphene structures with homogeneous dispersion. These structures allow for absorbing corrosion products, forming a dense protective layer against corrosion, and local micro‐tuning of the suppression of charge transfer. This results in superior corrosion resistance with an outstanding strength‐ductility balance of the composites via ultrafine‐grained and precipitation strengthening. The anti‐corrosion polarization resistance remains 89% of the initial state after 2‐month immersion in chloride‐containing environment, while the ultra‐tensile strength and elongation of 532 ± 39 MPa and 17.3 ± 1.2% are obtained. The economical strategy of heteroatom modification broadens the horizon for anti‐corrosion engineering in aluminum matrix composites, which is critical for the design of carbonaceous nanomaterial‐reinforced composites to realize desired performances for practical applications.

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Liquid-phase exfoliated fluorographene as a two dimensional coating filler for enhanced corrosion protection performance

Cited by 100 publications

References 32 publications

Fluorographite Nanoplatelets with Covalent Grafting of Anion-Exchange Resins for Water Purification

Fluorographite Nanoplatelets with Covalent Grafting of Anion-Exchange Resins for Water Purification

Durable Corrosion Resistance of Copper Due to Multi-Layer Graphene

Heteroatom Modification Enhances Corrosion Durability in High‐Mechanical‐Performance Graphene‐Reinforced Aluminum Matrix Composites

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