Massive dielectric properties enhancement of MWCNTs/CoFe 2 O 4 nanohybrid for super capacitor applications

Magnetic clustering of Ni2+ ions in metal-ceramic nanocomposites obtained from Ni-exchanged zeolite precursors

“…In the last decade, the scientific interest towards magnetic nanostructured / nanocomposite materials has steadily increased owing to their functional properties associated with widespread applications ranging from electronics [1], magneto-optics and photocatalysis [2][3][4][5] to supercapacitors [6,7], hyperthermia [8], drug delivery [9,10], water remediation [11], energy harvesting [12]. Oxides of transition metals / rare earths have received particular attention because of the concurrence of magnetic effects and semiconducting-like properties [3,12,13] Magnetic metal-ceramic nanocomposites, consisting of a dispersion of Fe 0 , Co 0 , or Ni 0 nanoparticles into a prevailingly amorphous silica and alumina ceramic matrix, are an important sub-class of nanomaterials whose fields of application are typically associated with their porous structure, which makes them particularly suitable for use in environmental protection [14][15][16][17][18][19][20][21][22], catalysis [23][24][25][26][27][28] and biomedicine [29][30][31][32][33].…”

Dielectric study of CoFe2O4/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

“…Large content of CFO (>30 phr) with MWCNT enhances the conduction network and hence results in recombination of electrons and holes and diminish the polarization. [39] So the optimum phr of CFO is 30 phr for better sample with enhanced properties. The dielectric constant is decreases with increase in frequency as shown in Figure 6A.…”

“…[35,[41][42][43] The decrease in dielectric constant is in consistent with Koop's theory and Maxwell Wagner theory. [39,44] According to the theory, when ferrites are placed in external applied field the hopping of electrons and holes between Fe 2+ to Fe 3+ ions as result the mobile electrons drift towards the grain boundary and get accumulated in the well due to high resistance at grain boundary consequently, this process results in interfacial polarization. [45][46][47][48][49] It can be observed that dielectric loss acquire maximal value in regime of low frequency and become constant at high frequency.…”

Unusual Cu–Co/GO Composite with Special High Organic Content Synthesized by an in Situ Self-Assembly Approach: Pyrolysis and Catalytic Decomposition on Energetic Materials

“…Binary transition metal oxides such as Fe–Mg, Cu–Co, Ni–Co, Fe–Cu, and Fe–Zn, in contrast to single metal and metal oxides, are considered as the potential candidates of catalysts. − Among them, Cu–Co composites with abundant resources, low cost, and nontoxicity have been widely studied and practically applied in catalyst, luminescence, and electrode materials. − However, owing to the smaller particle size and higher surface energy, nanometal composite oxides inevitably suffer from aggregation which thus reduces their catalytic performance. Therefore, many strategies have been proposed to inhibit the agglomeration and increase the specific surface area of the nanoparticles. − Graphene oxide (GO), as a newly emerging functional carbon material, has a large amount of oxygen-containing functional groups on the surface and excellent properties such as an ultrathin two-dimensional atomic layer structure, large specific surface area, high electrical and thermal conductivity, as well as good mechanical properties. − Thus, GO can serve as an excellent carrier for nanocomposites and obviously weaken the agglomeration and enhance the catalytic activity.…”