Kinetic study of surfactant-free graphene exfoliation at a solvent interface

Hui, Taoran; Adamson, Douglas H.

doi:10.1016/j.carbon.2020.06.043

Cited by 7 publications

(7 citation statements)

References 35 publications

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“…Due to the physical and chemical properties of GN, it is superior to PG in thermal conductivity. So, it can explain that the PNGL 1.2 has a large amounts of PG particles that failed to exfoliate more GNs compare with PNGL 0.6 during the emulsion molding process, resulting in similar thermal imaging results with PG4.0%/PS 22,25,44 …”

Section: Resultsmentioning

confidence: 87%

“…The π–π stacking between the π‐bond of GNPG and the π‐bond of benzene rings of the polystyrene lead to a decrease in the mobility of the polymer chain and free volume 27,35 . However, an excess of PG powders fails to exfoliate more GNs at the oil–water interface, and it suggests that the addition of more PG powders cannot improve the material properties effectively 22,24 …”

Section: Resultsmentioning

confidence: 99%

“…Some researchers had found that there is a thin water layer on the surface of the hydrophilic flask wall, when the water layer is in contact with heptane vapor, leading to a high‐energy interface 21 . When the PG particles are located at this interface, a few PG could “climb” the surface to minimize the interfacial energy, thus exfoliating out the thin layer of GNs 22–24 . The PG particles cannot continue to exfoliate once the oil–water interface is covered by GNs 25 .…”

Section: Introductionmentioning

confidence: 99%

“…21 When the PG particles are located at this interface, a few PG could "climb" the surface to minimize the interfacial energy, thus exfoliating out the thin layer of GNs. [22][23][24] The PG particles cannot continue to exfoliate once the oil-water interface is covered by GNs. 25 Therefore, it leads to a low content of GNs.…”

Section: Introductionmentioning

confidence: 99%

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Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Wang

et al. 2023

J of Applied Polymer Sci

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High thermal conductivity and electrical insulation materials are necessary for packaging materials of miniaturized electronic equipment at present. Graphene nanosheets (GNs) have great potential in polymer composites due to its excellent thermal conductivity. However, the ultra‐high conductivity of GNs will reduce the insulation of polymer composites, so that the GN composites have good thermal conductivity and electrical insulation has become the focus of research. Herein, the closed cell polystyrene nanocomposites are polymerized by using a Pickering emulsion route. Based on the exfoliating effect of pristine graphite at the oil–water interface and the amphiphilic properties of GNs during the preparation of emulsion, the resulting graphite can achieve good dispersion in the polystyrene resin. Furthermore, the high heat transfer rate of the resulting graphite makes the temperature of polystyrene resin increase by 60.2°C at room temperature within 1 min. Meanwhile, the high volume electrical resistivity (3.63 × 109 Ω·m) and breakdown strength (33.8 kV·mm−1) confirms the PNGL0.610%/PS composite keep excellent electrical insulation at 10.0 wt% filler loading.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphene nanosheet stabilized Pickering emulsion and its polystyrene nanocomposites

Wang

et al. 2023

J of Applied Polymer Sci

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“…The first step is graphene exfoliation in supercritical fluids (SCF) using an aqueous solution of ethanol. Previous studies have shown that the exfoliation process occurs when the energy required is compensated by the solvent –graphene interaction [ 36 , 37 ]. It requires solvents with surface energies close to that of graphene [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

Paraffin-Multilayer Graphene Composite for Thermal Management in Electronics

et al. 2023

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Multilayer graphene–paraffin composites with different contents of graphene (0–10 wt.%) were prepared using an ultra-high shear mixer. The aim is to improve the heat transfer in paraffin wax, which will lead to more-efficient thermal buffering in electronic applications. The multi-layer graphenes obtained by supercritical fluid exfoliation of graphite in alcohol were investigated by Raman spectroscopy, scanning electron microscopy and atomic force microscopy. Interesting morphological features were found to be related to the intercalation of paraffins between the multilayer graphene flakes. Thermal properties were also investigated in terms of phase change transition temperatures, latent heat by differential scanning calorimetry and thermal conductivity. It was found that the addition of graphene resulted in a slight decrease in energy storage capacity but a 150% improvement in thermal conductivity at the highest graphene loading level. This phase-change material is then used as a thermal heat sink for an embedded electronic processor. The temperature of the processor during the execution of a pre-defined programme was used as a performance indicator. The use of materials with multilayer graphene contents of more than 5 wt.% was found to reduce the processor operating temperature by up to 20%. This indicates that the use of such composite materials can significantly improve the performance of processors.

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