Yielding and flow of highly concentrated, few-layer graphene suspensions

Soft Matter ◽  
2015 ◽  
Vol 11 (16) ◽  
pp. 3159-3164 ◽  
Author(s):  
Sebastian Barwich ◽  
Jonathan N. Coleman ◽  
Matthias E. Möbius
Keyword(s):  
Simple Model ◽  
Bond Energy ◽  
Packing Fraction ◽  
Viscoelastic Response ◽  
Concentrated Suspensions ◽  
Layer Graphene ◽  
Graphene Platelets ◽  
Few Layer Graphene

We propose a simple model to explain the measured yielding behaviour of concentrated suspensions of graphene platelets which allows us to model the viscoelastic response in terms of bond energy, packing fraction and platelet dimensions.

Shungite Carbon as Unexpected Natural Source of Few-Layer Graphene Platelets in a Low Oxidation State

2018 ◽  
Vol 57 (14) ◽  
pp. 8487-8498 ◽  
Author(s):  
Emanuela Tamburri ◽  
Rocco Carcione ◽  
Sara Politi ◽  
Mariglen Angjellari ◽  
Laura Lazzarini ◽  
...  
Keyword(s):  
Oxidation State ◽  
Natural Source ◽  
Layer Graphene ◽  
Graphene Platelets ◽  
Low Oxidation State ◽  
Few Layer Graphene ◽  
Shungite Carbon

Simple and scalable route for the ‘bottom-up’ synthesis of few-layer graphene platelets and thin films

2011 ◽  
Vol 21 (10) ◽  
pp. 3378 ◽  
Author(s):  
Christopher R. Herron ◽  
Karl S. Coleman ◽  
Rebecca S. Edwards ◽  
Budhika G. Mendis
Keyword(s):  
Thin Films ◽  
Bottom Up ◽  
Layer Graphene ◽  
Graphene Platelets ◽  
Few Layer Graphene

scholarly journals Properties of Silicone Rubber-Based Composites Reinforced with Few-Layer Graphene and Iron Oxide or Titanium Dioxide

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1550
Author(s):  
Vineet Kumar ◽  
Anuj Kumar ◽  
Minseok Song ◽  
Dong-Joo Lee ◽  
Sung-Soo Han ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Titanium Dioxide ◽  
Iron Oxide ◽  
Stress Relaxation ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Relaxation Rates ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Mechanical Actuation

The increasing demand for polymer composites with novel or improved properties requires novel fillers. To meet the challenges posed, nanofillers such as graphene, carbon nanotubes, and titanium dioxide (TiO2) have been used. In the present work, few-layer graphene (FLG) and iron oxide (Fe3O4) or TiO2 were used as fillers in a room-temperature-vulcanized (RTV) silicone rubber (SR) matrix. Composites were prepared by mixing RTV-SR with nanofillers and then kept for vulcanization at room temperature for 24 h. The RTV-SR composites obtained were characterized with respect to their mechanical, actuation, and magnetic properties. Fourier-transform infrared spectroscopy (FTIR) analysis was performed to investigate the composite raw materials and finished composites, and X-ray photoelectron spectroscopy (XPS) analysis was used to study composite surface elemental compositions. Results showed that mechanical properties were improved by adding fillers, and actuation displacements were dependent on the type of nanofiller used and the applied voltage. Magnetic stress-relaxation also increased with filler amount and stress-relaxation rates decreased when a magnetic field was applied parallel to the deformation axes. Thus, this study showed that the inclusion of iron oxide (Fe3O4) or TiO2 fillers in RTV-SR improves mechanical, actuation, and magnetic properties.

scholarly journals Temperature Dependence of G and D’ Phonons in Monolayer to Few-Layer Graphene with Vacancies

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mingming Yang ◽  
Longlong Wang ◽  
Xiaofen Qiao ◽  
Yi Liu ◽  
Yufan Liu ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Intrinsic Properties ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Layer Graphene ◽  
A Value ◽  
Few Layer Graphene

Abstract The defects into the hexagonal network of a sp2-hybridized carbon atom have been demonstrated to have a significant influence on intrinsic properties of graphene systems. In this paper, we presented a study of temperature-dependent Raman spectra of G peak and D’ band at low temperatures from 78 to 318 K in defective monolayer to few-layer graphene induced by ion C+ bombardment under the determination of vacancy uniformity. Defects lead to the increase of the negative temperature coefficient of G peak, with a value almost identical to that of D’ band. However, the variation of frequency and linewidth of G peak with layer number is contrary to D’ band. It derives from the related electron-phonon interaction in G and D’ phonon in the disorder-induced Raman scattering process. Our results are helpful to understand the mechanism of temperature-dependent phonons in graphene-based materials and provide valuable information on thermal properties of defects for the application of graphene-based devices.

Few-layer graphene prepared via microwave irradiation of black sesame for supercapacitor applications

2021 ◽  
Vol 425 ◽  
pp. 130664
Author(s):  
Xinghe Xu ◽  
Shichang Sun ◽  
Juan Luo ◽  
Rui Ma ◽  
Junhao Lin ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Supercapacitor Applications

Highly-doped p-type few-layer graphene on UID off-axis homoepitaxial 4H-SiC

2021 ◽  
Author(s):  
Tymoteusz Ciuk ◽  
Wawrzyniec Kaszub ◽  
Kinga Kosciewicz ◽  
Artur Dobrowolski ◽  
Jakub Jagiello ◽  
...  
Keyword(s):  
Layer Graphene ◽  
P Type ◽  
Few Layer Graphene
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