Multifunctional liquid-like graphene@fe₃o₄hybrid nanofluid and its epoxy nanocomposites

Abstract

Novel multifunctional graphene@Fe3O4 hybrid nanofluid with liquid‐like behavior at room temperature and low viscosity (5.5 Pa.s at 25°C) has been developed by using GO@Fe3O4 as a core, sulfuric acid‐terminated organosilanes as corona, and polyether amine as canopy. The obtained nanofluid has been extensively characterized by various analytical techniques. The content of graphene@Fe3O4 reaches up to 13.78 wt% in the hybrid nanofluid, which is a superparamagnetism material with specific magnetization of 0.39 emu/g. In addition, it shows excellent dispersion and exfoliation in solvents and polymer matrixes. It is then compounded with an epoxy resin for the development of liquid‐like graphene@Fe3O4 hybrid nanofluid/epoxy nanocomposites. It is found that liquid‐like graphene@Fe3O4 hybrid nanofluid/epoxy nanocomposites demonstrate better mechanical property than those of unmodified graphite/epoxy nanocomposites at the same fraction. For example, the multifunctional liquid‐like graphene@Fe3O4 hybrid nanofluid at 1.5 wt% improves the impact toughness of epoxy by 125%. This new interface modification also enhanced the Tg of neat epoxy from 98.37 to 129.46°C. POLYM. COMPOS., 37:3474–3485, 2016. © 2015 Society of Plastics Engineers

Coupling hybrid of graphene oxide and layered zirconium phosphonate to enhance phenolic resin–based friction materials

“…A further increase in nanofiller loading can bring about nanoparticle agglomeration. Once this agglomeration has occurred, the nanoparticles played the role of stress concentration points, which can reduce the bending and impact properties of the material …”

Enhanced toughness and glass transition temperature of epoxy nanocomposites filled with solvent-free liquid-like nanocrystal-functionalized graphene oxide

“…As shown in Fig. 3a, the presence of hydroxyl (3400 cm -1 ), epoxy (1177 cm -1 ) and carbonyl (1729 cm -1 ) groups indicates that GO has been synthesized successfully [3]. Compared to GO, the absorption peak suggesting that PEGS has also been decorated.…”

“…And it is high enough for the applications of microwave absorbents and electromagnetic shielding coatings [30]. Moreover, the inset graph shows that the obtained liquid-like nanocrystal-functionalized graphene oxide can be immediately responsed to a permanent magnet, which implys that it could also be successfully aligned in a bulk polymer matrix under an external magnetic field [3]. It had been demonstrated that the enhanced solubility of nanofillers in desired solvents is beneficial for the dispersion in matrix [2].…”

“…The second one is that the residual silicon hydroxyl groups in liquid-like nanocrystal-functionalized graphene oxide can react with epoxy matrix and form the chemical crosslinking shown in Fig. S5, and contributs to the enhancement of T g of its epoxy nanocomposites [3].…”

Doping effects of cerium ion on structure and electrochemical properties of polyaniline

“…[6][7][8][9] However, it is difficult to meet the requirements in all industries with PANI alone. Up to now, many PANI-based composites such as PANI/Ag, 10,11 PANI/Au 12 and PANI/Zn 13,14 have shown great performance. Therefore, the development of PANI-based composites is of great significance.…”