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| The relation between structural atomic lattice and the degree of crystallinity of NP is nicely demonstrated here. Moreover, properties (mechanical, growth processes) of supracrystals also change with the nanocrystallinity of the nanoparticles used as building blocks. |
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| Snapshots of the outer and inner surface spin configurations subject to varying magnetic fields (a) h = 100 (the maximum positive applied field), (b) h = 0 (remanence at the upper branch), (c) h = −25 (near the negative coercive field), and (d) h = −100 (the maximum negative applied field). Spins have been colored with a gradient from dark-red/dark-blue (outer/inner surface) for spins along the field direction to yellow/green (outer/inner surface) for spins transverse to the field direction. Only a slice of the spin configurations of a hollow nanoparticle close to the central plane and perpendicular to the field direction is shown. |
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| Bright-field TEM images of the 12 nm Fe/γ-Fe2O3 (a) core/shell, (b) core/void/shell, and (c) hollow nanoparticles |
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| Temperature dependence of ZFC and FC magnetization taken in a field of 50 Oe for (a) 10 nm and (b) 15 nm hollow particles. |
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| Temperature dependence of the net moment of frozen spins ( M f ) for (a) 15 nm, (b) 10 nm, and (c) 8 nm Fe/γ-Fe 2O 3 nanoparticles. H EB and M f are plotted as a function of particle size (d). |
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| Hysteresis loops (M–H) measured in the ZFC and FC protocols for cubic, spherical, and octopod-shaped FeO/Fe3O4 nanoparticles. The inset of (a) shows an enlarged portion of the M–H curves featuring the low-field jump in the FC magnetization of the cubic nanoparticles. This feature is less pronounced in the case of the octopod-shaped nanoparticles (c) and is almost absent in the case of the spherical nanoparticles (b). |
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| (a) Temperature dependence of exchange bias field for cooling field of 1 T and (b) temperature dependence of isothermal remanence. Insets in (a) show the ZFC and FC hysteresis loops at 10 K and 100 K. Inset in (b)shows the temperature dependence of blocking function distribution. |
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| The FC M( H) loops taken at 5 K for (a) 9.2 nm and (b) 18.7 nm hollow nanoparticles. The TEM image of the 18.5 nm solid nanoparticles is shown in the inset of (b). |
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| Schematic illustration of the transformation of Mn3O4 NCs, showing the evolution of their morphology via the localized dissolution of Mn3O4 and the surface precipitation of g-Fe2O3. (B to E) HRTEM images of the hollow nanostructures synthesized by the reaction of Mn3O4 NCs with 1 ml of aqueous solutions of iron(II) perchlorate having different concentrations. |
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| (a) The M(H) curves of the HNSs sample and the MnCO3 bulk at T = 5 K for the magnetic field sweep ±50 kOe. The inset shows the hysteresis curves on an expanded scale around the H = 0 origin. (b) The M − χAFMH curves, by subtracting the linear (AFM-type) contribution from the measured magnetization data. Away from the hysteretic region, only the curves of the up-field run are shown. The inset shows the pure FM hysteresis loops MFM(H) on an expanded scale. |
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| Amount of intercalated/deintercalated Li+ ions as a function of cycle numbers at different rates (a) with different individual electrodes. |
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| Different core/shell nanoparticles: (a) spherical core/shell NPs ; (b) hexagonal core/shell NPs; (c) multiple small core materials coated by single shell material; (d) nanomatryushka material; (e) movable core within hollow shell material. |
