Highly magnetic nanocomposites consist of magnetite nanoparticles, graphene oxide and hyper-branched poly citric acid

Applications of Graphene and Its Derivatives in the Upstream Oil and Gas Industry: A Systematic Review

“…In addition, magnetic nanomaterials (such as Fe, Co, Ni and Co 3 O 4 ) have strong magnetic loss to microwave. Therefore, by combining graphene with magnetic nanoparticles, graphene/magnetic nanocomposites with both electrical loss and magnetic loss can be obtained, which is conducive to widening the absorption band and impedance matching, and improving the microwave absorption capacity [130][131][132][133][134][135][136][137][138]. When applied to the development of heavy oil wells, the penetration depth of microwave can be increased, and the effect of viscosity reduction and stimulation can be improved.…”

Alignment Control of Ferrite-Decorated Nanocarbon Material for 3D Printing

“…Employing functionalization techniques to adhere magnetic particles [ 32 , 33 , 34 , 35 ] has demonstrated an increase in magnetic particle loading, albeit with a random distribution of particles across the surface of the MWCNTs. Following this principle, the optimal strategy for synthesizing anisotropic graphene entails deliberately generating active sites on graphene or carbon nanotubes.…”

Green and Solvent-Free Supercritical CO2-Assisted Production of Superparamagnetic Graphene Oxide Aerogels: Application as a Superior Contrast Agent in MRI

“…[22][23][24] Eventually, the use of coating agents has also been proposed to control NPs clustering. 25,26 Accordingly, this study first explores the use of small ligands, such as citrate, 27 to functionalize the magnetic NPs for the control of the aggregation during deposition on the GO surface. Next, the use of polyethylenimine (pei), a widely employed coating agent in the pharmaceutical industry, is investigated to modulate the behavior of the composite in water.…”

“…The ecofriendly process designed with scCO 2 allowed achieving a completely solvent (toxic or harmful to the environment)-free product, thus not compromising its use in the biomedical area. Finally, the use of the ex situ procedure circumvents the drawback of NPs’ uncontrolled aggregation during growth, since it has been proven that only the controlled clustering of the magnetic NPs results in a considerable increase of MRI efficiency. − Eventually, the use of coating agents has also been proposed to control NP clustering. , Accordingly, this study first explores the use of small ligands, such as citrate, to functionalize the magnetic NPs for the control of the aggregation during deposition on the GO surface. Next, the use of polyethylenimine ( pei ), a widely employed coating agent in the pharmaceutical industry, is investigated to modulate the behavior of the composite in water …”