Highly adsorptive graphene aerogel microspheres with center-diverging microchannel structures

Abstract

Novel graphene oxide aerogel microspheres (GOAMs) with well-defined “center-diverging microchannel” structures are obtained by a novel approach, i.e. a combination of electrospraying and freeze-casting. A formation mechanism, i.e. radial-directional freezing–thawing, was proposed. The reduced GOAMs exhibit excellent adsorption ability for various organic liquids and oils due to their highly hierarchical hydrophobic structure and a random packing effect.

A novel method to prepare homogeneous biocompatible graphene‐based PDMS composites with enhanced mechanical, thermal and antibacterial properties

“…The elemental ratio of C/O for GOAMs and graphite oxide was ~2.49 and ~2.58, respectively. This almost same elemental ratio was also because that there was no chemical reaction between GO sheets but only physically entangled and overlapped when formed GOAMs. Therefore, it could be easily separated from each other when ultrasonic applied.…”

“…When compared with GO which had a characteristic sharp diffraction peak at 2θ~10.7 , two other diffraction peaks were observed for GOAMs, one was at 2θ~10.4 and the other was at 2θ~25.8 . The peak at 2θ~25.8 was weak and broad, which might be caused by the partial stacking of incompletely oxidized graphene sheets during the formation of ice crystals as explained by Liao [24]. For reduced samples, the peak of rGOAMs was almost as same as the graphene in XRD, which further confirmed the efficient reduction of GOAMs.…”

Simultaneous reduction and surface functionalization of graphene oxide and the application for rubber composites

“…After the reduction of GO, the average size of the sp 2 domains decreases with the formation of more graphitic domains . Also, the increase in the I D /I G ratio indicates the GO was successfully grafted and reduced with APMEL …”

Effect of flake size on the mechanical properties of graphene aerogels prepared by freeze casting

“…Graphene aerogel has aroused increasing attention from interdisciplinary elds for its wide potential applications such as so electronic sensors, energy absorbers, oil-removal materials, and so on. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Its mechanical properties, including strength, robustness, and fatigue resistance are highly crucial for those applications. 1,7,8,[20][21][22][23][24][25] From a mechanical point of view, graphene aerogels are highly porous, lightweight and thus usually fragile.…”