Densification of expanded graphite

Thermal conductivity enhancement of phase change materials using a graphite matrix

“…Typically the matrix is formed by compacting the EG powder in a piston apparatus [6,18,23,24]. Due to the small density of the EG, the compaction process may have to be carried out in stages, where EG is loaded and partially compressed multiple times before compacting the EG to the desired bulk density [25].…”

“…The porosity is due to the intraparticle pores, formed during the expansion of the graphite sheets, and interparticle pores that make up the open space in the matrix between the EG particles [23]. As the bulk density of the matrix increases, the porosity and the surface area of the matrix decrease [18].…”

Graphitic nanofillers in PMMA nanocomposites—An investigation of particle size and dispersion and their influence on nanocomposite properties

“…As such, it has been explored for numerous uses such as pollutant absorber, catalyst support, radiation and electromagnetic shielding, and shrinkage-and corrosion-resistance coatings. [44][45][46][47][48] Additionally, the pores in the expanded layered structure of EG have been suggested to be capable of absorbing polymer molecules and leading to improved interactions between the platelets and the host polymer in EG/polymer nanocomposites. 16 Interestingly, sonication of EG in a viscous liquid can further separate its platelets into smaller graphite nanoplatelets (GNP) 49 with thicknesses on the order of 10 nm.…”

“…However, thus far fewer papers have been published for graphite/ polymer as compared to clay/polymer nanocomposites. Several research groups 12,16,17,47,30,50,31,32 have claimed improvements in properties of polymer composites using graphite nanofillers (EG and GNP) with an emphasis on the electrical properties. Electrical percolation was quoted for a filler concentration of about 2 wt % for EG 11,16,22,31 or ''foliated graphite,'' 33,37 FG, (Foliated graphite, FG, is a term used in some papers to indicated EG in which the worm-like structure has been broken into separated platelets) but a loading of over 5 wt % is required for natural graphite 16,34 particles of larger dimension and thickness (as shown in Table 1).…”

Preparation of expanded graphite-based composites by one step impregnation

“…Expanded graphite-based composite (EGC) is focussed on because of its many potential applications [1] . Highly compressed EG has been used as seals and gaskets, but the most attractive application for the EG was considered as adsorbent, especially for treatment of industrial waste water [2][3][4][5] .…”