Sweet graphene I: toward hydrophilic graphene nanosheets via click grafting alkyne-saccharides onto azide-functionalized graphene oxide

Namvari, Mina

doi:10.1016/j.carres.2014.06.012

Cited by 58 publications

(27 citation statements)

References 69 publications

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“…Reduction in the d-spacing after functionalization, indicated that upon functionalization, the structure of the samples was changed due to the amorphization of the material by introducing the organic moiety into the interlayer spacing of GO. For all four different rGOf, one crucial peak can be seen at 2358 cm −1 indicating the stretching of C-N, proving the success of azide-alkyne coupling reaction on the GO sheets [27,31]. The intensities of the peaks indicating the presence of oxygen-containing functionalities showed a dramatic reduction from GO to rGOf.…”

Section: Materials Characterizationmentioning

confidence: 82%

“…All the four different rGOf have almost similar SEM images. Fluffy aggregates on rGOf can be clearly observed due to the presence of organic moiety on their surfaces [27]. The FESEM image of rGOf shows that functionalization was successfully done by decorating organic molecules on the GO.…”

Section: Materials Characterizationmentioning

confidence: 83%

“…The absorption peaks at 3282, 2112 and 676 cm −1 corresponding to the presence of C≡C terminal stretching, C≡C stretching and C≡C bending respectively. The intensity of C-H stretching at 2930 cm −1 increased in GO f , thus proving that the GO have been attached by the organic moiety synthesized, DiPPOH [27].…”

Section: Materials Characterizationmentioning

confidence: 94%

“…It shows that rGOf has lower water content than GO. This can prove that the hydroxyl groups in the rGOf have been reduced by covalent functionalization of the organic moiety on the surface of GO [27,32]. Secondly, the unstable oxygen-containing functional groups will be thermally decomposed at a temperature of 225 °C [32,33].…”

Section: Materials Characterizationmentioning

confidence: 99%

“…The prepared alkyne-functionalized graphene oxide and four different azide-functionalized alkyls followed by sodium ascorbate were added to the mixture of water and DMSO (20:10) and sonicated for 1 h. CuSO 4 ·5H 2 O was added and then sonicated for 2 h. The mixture was stirred overnight and then wash with water and ethanol [27][28][29]. The product dried overnight and give reduced-functionalized graphene oxide, rGO f as the final product.…”

Section: Materials Preparationmentioning

confidence: 99%

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Lube Oil Wear Reduction via Organic Tribofilms

Ismail

2017

Lubricants

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Effective tribofilms are desirable to protect mechanical systems. In the research, the reduction in wear and friction were investigated through the use of organic additives. Graphene-based organic additives were prepared by surface modification of graphene using organic moiety that will provide tribochemical reaction with rubbing metal surface. The role of surface protective additives becomes vital when operating conditions become severe and moving components operate in a boundary lubrication regime. After protecting film is slowly removed by rubbing, it can regenerate through the tribochemical reaction of the additives at the contact. Many researchers demonstrated that organic additives physically or chemically adsorbed on rubbing metal surfaces to form monolayers, with their shear strength deriving primarily from the weak van der Waal interactions between opposing hydrocarbon chains at the interfaces. Experiments were conducted on a base oil where 0.01 wt % of the additive was used. Tribological evaluation was conducted using four-ball tester under room temperature and the morphology of the worn surfaces were characterized using Field emission scanning electron microscopy (FESEM). Experimental results showed a 16% reduction in friction and 30% reduction in wear when compared to the base oil containing no additive.

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Section: Materials Characterizationmentioning

confidence: 82%

Section: Materials Characterizationmentioning

confidence: 83%

Section: Materials Characterizationmentioning

confidence: 94%

Section: Materials Characterizationmentioning

confidence: 99%

Section: Materials Preparationmentioning

confidence: 99%

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Lube Oil Wear Reduction via Organic Tribofilms

Ismail

2017

Lubricants

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Chemistry of Graphene Derivatives: Synthesis, Applications, and Perspectives

Šturala

Luxa

Pumera

et al. 2018

Chemistry A European J

115

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The chemistry of graphene and its derivatives is one of the hottest topics of current material science research. The derivatisation of graphene is based on various approaches, and to date functionalization with halogens, hydrogen, various functional groups containing oxygen, sulfur, nitrogen, phosphorus, boron, and several other elements have been reported. Most of these functionalizations are based on sp hybridization of carbon atoms in the graphene skeleton, which means the formation of out-of-plane covalent bonds. Several elements were also reported for substitutional modification of graphene, where the carbon atoms are substituted with atoms like nitrogen, boron, and several others. From tens of functional groups, for only two of them were reported full functionalization of graphene skeleton and formation of its stoichiometric counterparts, fluorographene and hydrogenated graphene. The functionalization of graphene is crucial for most of its applications including energy storage and conversion devices, electronic and optic applications, composites, and many others.

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Synthesis of Glycodendrimers with Antiviral and Antibacterial Activity

Hoyos

Perona

Juanes

et al. 2021

Chemistry A European J

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Glycodendrimers are an important class of synthetic macromolecules that can be used to mimic many structural and functional features of cell‐surface glycoconjugates. Their carbohydrate moieties perform key important functions in bacterial and viral infections, often regulated by carbohydrate–protein interactions. Several studies have shown that the molecular structure, valency and spatial organisation of carbohydrate epitopes in glycoconjugates are key factors in the specificity and avidity of carbohydrate–protein interactions. Choosing the right glycodendrimers almost always helps to interfere with such interactions and blocks bacterial or viral adhesion and entry into host cells as an effective strategy to inhibit bacterial or viral infections. Herein, the state of the art in the design and synthesis of glycodendrimers employed for the development of anti‐adhesion therapy against bacterial and viral infections is described.

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Sweet graphene I: toward hydrophilic graphene nanosheets via click grafting alkyne-saccharides onto azide-functionalized graphene oxide

Cited by 58 publications

References 69 publications

Lube Oil Wear Reduction via Organic Tribofilms

Lube Oil Wear Reduction via Organic Tribofilms

Chemistry of Graphene Derivatives: Synthesis, Applications, and Perspectives

Synthesis of Glycodendrimers with Antiviral and Antibacterial Activity

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