Polystyrene/graphene oxide nanocomposites synthesized via Pickering polymerization

Preparation and Characterization of Graphene Oxide‐Grafted Hexadecanol Composite Phase‐Change Material for Thermal Energy Storage

“…The covalent bonds are strong, which prevents the escape of HD, and the repulsion between HD molecules is strong enough to suppress the aggregation of GO sheets during fabrication. Therefore, from the TEM image in Figure e, it is observed that GO‐ g ‐HD is also composed of thin flakes with irregular corrugation, similar to the morphology of GO . This observation indicates that the microstructure of GO is not destroyed during the covalent grafting process.…”

“…This peak shifts to 11.2° with a d ‐spacing of 0.79 nm for GO samples. The downshifted diffraction angles and widened interlayer space indicate that there are oxygen‐containing groups in the sheets . Typical diffraction peaks of pure HD were observed at 21.8 and 24.6° .…”

“…The FTIR spectra of graphite, pure HD, GO, GO−COCl, HD/GO, and GO‐ g ‐HD are presented in Figure . From the spectrum of neat graphite in Figure , the broad and intense band at =3432 cm −1 is ascribed to the stretching vibration of O−H groups, which may come from adsorbed water, and the band at =1620 cm −1 , corresponding to the C=C resonance adsorption, originates from the aromatic benzene rings of graphite . For GO, the emerging bands at =1722, 1388, and 1070 cm −1 , compared with neat graphite, are assigned to C=O stretching vibrations of carbonyl and carboxyl groups, deformation vibrations, and C−O stretching vibrations, respectively .…”

Graphene Nanocomposites Studied by Raman Spectroscopy

“…By chemical oxidation of graphite in the presence of strong oxidizing agents and ultrasonic cleavage graphite oxide is obtained, at the end presenting on its surface a significant number of functional groups such as hydroxyl, carboxyl and epoxy [57]. The introduction of oxygenated functionalities not only expands the layer separation, but also makes the material hydrophilic and relatively easy to disperse in aqueous media or other polar solvents [58]. This property enables graphite oxide to exfoliate in hydrophilic medium under sonication and finally to produce single or few layer graphene oxide (GO).…”

Novel Pickering stabilizer constituted by graphene oxide and carbon nanotubes for Fabricating poly(methyl methacrylate) nanocomposites

“…It has been reported that GO or functionalized CNTs containing hydrophobic non‐oxidized sp 2 ‐hybridized carbon domains and hydrophilic oxygen‐bearing groups are considered as an amphiphilic species, which is an important structural feature to be used as particle stabilizers for Pickering emulsions . Owing to their scientific and technological significance, great efforts have been directed at investigating the oil‐in‐water (o/w) and water‐in‐oil (w/o) type Pickering emulsion with polymerizable monomer as oil phase . It becomes evident that polymer microspheres or porous polymer composites containing ordered carbon structure formed by GO or CNTs can be conveniently acquired by initiating the polymerization reaction.…”