Graphene oxide and reduced graphene oxide studied by the XRD, TEM and electron spectroscopy methods

Stobiński, Leszek; Lesiak, B.; Małolepszy, Artur; Mazurkiewicz, Michał; Mierzwa, Bogusław; Zemek, J.; Jiřı́ček, P.; Bieloshapka, I.

doi:10.1016/j.elspec.2014.07.003

Cited by 1,525 publications

(777 citation statements)

References 34 publications

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“…3 gives the XRD spectrum of the GO. A typical single strong peak appeared at approximately 10˚ [24], which indicates that the oxygen functional groups have penetrated onto the surface of graphene. An average thickness of 0.328 nm (single sheet) was also calculated from the XRD pattern according to the Scherrer equation with a constant (K) equal to 0.89 [24].…”

Section: Characterisation Of Graphene Oxidementioning

confidence: 99%

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Zhu

Kang

Yang

et al. 2017

Construction and Building Materials

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Highlights:(1) Graphene Oxide (GO) caused a significant reduction in fluidity and a slight decrease in compressive strength of AAS mortars.(2) The flexural strength of hardened mortars were improved by adding GO.(3) Layered double hydroxides (LDHs) were observed and confirmed in GO-added AAS system. AbstractDue to its high aspect ratio and outstanding tensile strength, graphene oxide (GO) can dramatically reduce the brittleness of cement-based materials. In this paper, GO nanosheets were successfully synthesised using the modified Hummers' method. Effects of the GO on the fluidity, mechanical properties of alkali-activated slag (AAS) mortars and the microstructure of the AAS pastes were studied.It is found that addition of the GO caused a significant reduction in fluidity and a slight decrease in the compressive strength of the hardened mortars. However, the GO improved the flexural strengths by 20% with a dosage of 0.01 wt. % after 7 days. Large-scale layered double hydroxides (LDHs) were observed using SEM, the compositions of which were identified and EDS and XRD. A possible mechanism of the formation of LDHs in the GO-AAS system is proposed. Due to the Mg 2+ /Al 3+ decomposed from the slag and the Al(OH)4 -formed in the high pH condition in the GO-AAS system, the reaction pathway of LDHs 2 can be regarded as a , This research provides a further understanding of the effect of graphene oxide which has a potential application of GO in AASC.

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Section: Characterisation Of Graphene Oxidementioning

confidence: 99%

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Zhu

Kang

Yang

et al. 2017

Construction and Building Materials

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“…Its electron concentration was below 10 16 cm −3 . GO flakes were obtained by oxidation of graphite powder as per the modified Hummers method [2,3]. Light to dark yellow-brown GO is highly hydrophilic and forms stable aqueous suspension.…”

Section: Methodsmentioning

confidence: 99%

Light Induced Modification of Graphene Oxide Layers on GaN Basis

et al. 2016

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Graphene oxide suspension in various solvents was spin coated on metal organic vapor phase epitaxy grown GaN/saphire layers. Samples were characterised using the Raman spectroscopy and atomic force microscopy, before and after high temperature treatment. We found that graphene oxide was modifed by high temperature treatment, however a considerable modification was also observed as a result of impinged laser light incident due to the measurements. The Raman spectra were decomposed into two contributions showing different behaviour during the Raman scattering measurements.

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“…Hydrophobized MM probably forms aggregates in the aqueous phase which can stiffen the internal structure of MUC solution, and this explains the increase of both G' and G''. On the contrary, GOx is hydrophilic but has very high surface area (~ 150 m 2 /g - Stobinski et al, 2014), which allows effective binding to polar moieties of MUC molecules, increasing the crosslinking interactions. BT, which is also hydrophilic, does not have such a large surface area (~ 67 m 2 /g -Kondej and Sosnowski, 2013) so cannot bind to MUC so efficiently.…”

Section: Part II Influence Of Nanostructure Particles (Nps) On Transmentioning

confidence: 99%

Bronchial Mucus as a Complex Fluid: Molecular Interactions and Influence of Nanostructured Particles on Rheological and Transport Properties

Odziomek

Kalinowska

Płuzińska

et al. 2017

Chemical and Process Engineering

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Transport properties of bronchial mucus are investigated by two-stage experimental approach focused on: (a) rheological properties and (b) mass transfer rate through the stagnant layer of solutions of mucus components (mucine, DNA, proteins) and simulated multi-component mucus. Studies were done using thermostated horizontal diffusion cells with sodium cromoglycate and carminic acid as transferred solutes. Rheological properties of tested liquids was studied by a rotational viscometer and a cone-plate rheometer (dynamic method). First part of the studies demonstrated that inter-molecular interactions in these complex liquids influence both rheological and permeability characteristics. Transfer rate is governed not only by mucus composition and concentration but also by hydrophobic/hydrophilic properties of transported molecules. Second part was focused on the properties of such a layer in presence of selected nanostructured particles (different nanoclays and graphene oxide) which may be present in lungs after inhalation. It was shown that most of such particles increase visco-elasticity of the mucus and reduce the rate of mass transfer of model drugs. Measured effects may have adverse impact on health, since they will reduce mucociliary clearance in vivo and slow down drug penetration to the bronchial epithelium during inhalation therapy.

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Graphene oxide and reduced graphene oxide studied by the XRD, TEM and electron spectroscopy methods

Cited by 1,525 publications

References 34 publications

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Light Induced Modification of Graphene Oxide Layers on GaN Basis

Bronchial Mucus as a Complex Fluid: Molecular Interactions and Influence of Nanostructured Particles on Rheological and Transport Properties

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