Controlled direction of electrical and mechanical properties in nickel tethered graphene polyimide nanocomposites using magnetic field

A facile assembly of polyimide/graphene core–shell structured nanocomposites with both high electrical and thermal conductivities

“…The percolation threshold of PI/r-GO nanocomposite could be reduced to about 0.12 vol% through utilization of covalent bonding and oriented distribution, but the graphene should be chemical modified and blended with PI oligomers in N,N-dimethylformamide, such fabrication process was complicated and environmentally unfriendly [39]. Moreover, oriented graphene along the in-plane direction will decrease through-plane conductivity, the through-plane conductivity even reached insulation (10 À12 S/m) with 1.3 vol% graphene when the graphene was highly oriented along the in-plane direction [40]. By comparison, the graphene used in this paper did not need to be chemical modified and the composite fabrication process was organic solvent free, which was very suitable for the preparation of high electrical conductive PI/r-GO nanocomposites.…”

“…PI/GP nanocomposites are usually fabricated via in-situ polymerization or solution blending, which is very difficult to precisely control the conductive network structure of these composites even with application of shear or magnetic field [39,40]. Therefore, PI microspheres may be the best choice for the conductive network control of graphene in PI/GP nanocomposites.…”

Retracted Article: A versatile strategy for alternately arranging the foam ratio layers of multilayer graphene/thermoplastic polyurethane composite foams towards lightweight and broadband electromagnetic wave absorption

“…The distribution of absorbents in the polymer matrix has a signicant effect on reducing the content of absorbents and enhancing the EWabsorbing performance. [31][32][33][34] Therefore, the relationship between the dispersion of absorbents and the EW-absorbing performance has been investigated extensively. [35][36][37] Some researchers have found that preferentially distributed absorbents are good for the absorption of EW radiation.…”

Laboratory setup for rapid in situ powder X-ray diffraction elucidating Ni particle formation in supercritical methanol

“…Here, nickel is chosen because of the low absorption and high scattering power for the Cu Kα radiation. Nickel nanoparticles have gained interest due to their catalytic properties as well as their magnetic properties, 28,29 making their nucleation and growth mechanism a relevant research subject. Experimental A 2.0 M solution of Ni 2+ was prepared by dissolving Ni(NO 3 ) 2 ⋅6H 2 O (Technical grade >98% purity Sigma-Aldrich) in methanol (Baker Analyzed LC-MS Reagent).…”