A facile synthesis method for highly water-dispersible reduced graphene oxide based on covalently linked pyridinium salt

Shin, Dong Geun; Yeo, Hyeonuk; Ku, Bon‐Cheol; Goh, Munju

doi:10.1016/j.carbon.2017.05.064

Cited by 14 publications

(6 citation statements)

References 52 publications

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“…Compared to other oxidants, potassium permanganate (KMnO 4 ), as a green and industrial oxidant, is preferred for its attractive characteristics of relatively low cost, easy handling, effectiveness, and comparative stability over a wide pH range . Inspired by classic Hummers’ method , for preparing water-dispersible graphite oxide, we used KMnO 4 in dilute sulfuric acid (H 2 SO 4 ) medium (1 wt %) to produce CNCs-COOH in the present study. It was found that high-yield CNCs-COOH could be obtained in a short time (8 h) by KMnO 4 oxidation at mild reaction condition (50 °C) with the introduction of oxalic acid (OA, H 2 C 2 O 4 ) as a reducing agent.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Preparation of Carboxylated Cellulose Nanocrystals and Their Liquid Crystalline Behaviors

Zhou

Shu

et al. 2018

ACS Sustainable Chem. Eng.

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Carboxylated cellulose nanocrystals (CNCs-COOH) have attracted great attention for their potential applications in reinforcing polymer materials and surface modification. Herein, we developed a low-cost approach to prepare CNCs-COOH from pulp with high yield at mild reaction conditions (50 °C, 1 wt % sulfuric acid medium) using potassium permanganate (KMnO 4 ) and oxalic acid (OA, H 2 C 2 O 4 ) as the oxidizing and reducing agents, respectively. The oxidant dosage in this strategy is much lower than that in a conventional TEMPO method, and the yield of CNCs-COOH can reach as high as 68.0%, with a carboxylate content of 1.58 mmol/g. In this reaction system, the presence of the OA can complex with Mn 3+ to form [Mn(C 2 O 4 2− )] + and prevent the Mn 3+ from being reduced to Mn 2+ , leading to the strong oxidizing capacity of the reaction system maintained for a longer time. Atomic force microscopy analysis showed that rod-like CNCs were obtained with an average size of 10−22 nm in diameter and 150−300 nm in length. The crystal structure of as-prepared CNCs-COOH was nearly unchanged, and the crystallinity was 89.2% based on WAXD analysis. Of particular interest, CNCs-COOH suspension with high concentration (>6 wt %) also exhibited the same intriguing chiral nematic liquid crystalline self-assembly behaviors as sulfate CNCs prepared by traditional H 2 SO 4 hydrolysis method. This study provides an efficient and cost-effective way to fabricate CNCs-COOH, leading to great potential applications in constructing advanced functional material.

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Section: Introductionmentioning

confidence: 99%

One-Pot Preparation of Carboxylated Cellulose Nanocrystals and Their Liquid Crystalline Behaviors

Zhou

Shu

et al. 2018

ACS Sustainable Chem. Eng.

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“…Graphene, a 2D carbon material, exhibits intriguing and unparalleled properties. The remarkably high mechanical strength, excellent conductivity, low shear strength, and high surface area signify graphene a potential candidate for tribological applications. − The graphene synthesis routes, the presence of functional groups including residual oxygen functionalities, the thickness and lateral size of each sheet, the number of atomic lamellae in a sheet, and structural defects govern the tribological properties of graphene. ,− The ease of surface functionalization, the presence of oxygen functionalities, excellent conductivity to dissipate the heat, ultralow thickness to enter the tribo-interfaces, good affinity to make the protective tribo-thin film on contact interfaces, and low shear strength drive the potential of graphene-based materials for aqueous lubrication. ,− …”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Aqueous Lubricants: Dispersion Stability to the Enhancement of Tribological Properties

Chouhan

Kumari

Sarkar

et al. 2020

ACS Appl. Mater. Interfaces

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The present investigation demonstrates a green and scalable chemical approach to prepare aminoborate-functionalized reduced graphene oxide (rGO-AmB) for aqueous lubricants. The chemical, structural, crystalline, and morphological features of rGO-AmB are probed by XPS, FTIR, Raman, XRD, and HRTEM measurements. The spectroscopic analyses revealed the multiple interaction pathways between rGO and AmB. rGO-AmB exhibited long-term dispersion stability and improved the thermal conductivity of water by 68%. The thermal conductivity increased with increasing concentration of rGO-AmB and temperature. rGO-AmB as an additive to water (0.2%) enhanced the tribological properties of a steel tribopair under the boundary lubrication regime by the significant reduction in friction (70%) and wear (68%). The tribo-induced gradual deposition of an rGO-AmB-based thin film facilitated the interfacial sliding between the steel tribopair and protected it from the wear. The ultralow thickness, excellent dispersibility in water, high thermal conductivity, intrinsic low frictional properties, and good affinity toward the tribo-interfaces make rGO-AmB a potential candidate for aqueous lubricants.

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“…Electrospinning is a simple, efficient, and low-cost fabrication method for preparing ultrafine polymer nanofibers. Electrospun nanofibers can be used as adsorbent materials due to its large specific surface area and controllable cell morphology. , So, electrospun nanofibers could serve as a basic scaffold for preparing graphene-coated absorbents by coating of tiny amounts of graphene on the surface of the nanofibers to reduce the cost and simplify the preparing process, while with excellent adsorption efficiency and mechanical properties. However, traditional electrospun nanofiber mats have very tiny interstices (<1 μm) among the nanofibers, so that graphene sheets (normally with the size of >3 μm) can only be deposited onto the surface of the nanofibers mat.…”

Section: Introductionmentioning

confidence: 99%

Graphene Nanofibrous Foam Designed as an Efficient Oil Absorbent

Feng

Jin

et al. 2019

Ind. Eng. Chem. Res.

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Organic pollution is considered as a long-term, urgent global issue for energy, environmental, and ecological applications. Carbon-based materials have shown great potential in addressing this global issue. However, development of low-cost and high-performance of carbon-based three-dimensional materials has also proven to challenging for removal of organic pollutants from water. Here, we developed a new technique combining a liquid-assisted electrospinning and interface self-assembly of graphene to successfully fabricate novel graphene fluffy nanofibrous scaffold (GFNs) as an efficient organic pollution absorbent. The resultant GFNs with several advantages of distinctive 3D fluffy macro-structure, super porosity, low density, strong mechanical stability, and super hydrophobicity/oleophicity, demonstrated high adsorption capacity for organic solvents (201 times their own weight) and oils (119 times their own weight), as well as excellent recyclability by simple extrusion. Different from conventional graphene sponges that require a high content of graphene for complex fabrication, the preparation of GFNs only used a very small amount of graphene (1.0 mg/cm 3 ) to achieve comparable or even better adsorption capacity and recyclability. Because of the viable synthesis method, GFNs with unique advantages and superior performance show great potential for industrial applications in environmental protections such as oil pollution cleanup and wastewater treatment.

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A facile synthesis method for highly water-dispersible reduced graphene oxide based on covalently linked pyridinium salt

Cited by 14 publications

References 52 publications

One-Pot Preparation of Carboxylated Cellulose Nanocrystals and Their Liquid Crystalline Behaviors

One-Pot Preparation of Carboxylated Cellulose Nanocrystals and Their Liquid Crystalline Behaviors

Graphene-Based Aqueous Lubricants: Dispersion Stability to the Enhancement of Tribological Properties

Graphene Nanofibrous Foam Designed as an Efficient Oil Absorbent

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