Self-assembly of iron oxide precursor micelles driven by magnetic stirring time in sol–gel coatings

Abstract

Sol–gel synthesis of self-assembled iron oxide precursor micelles.

Control of the Length of Fe73.5Si13.5Nb3Cu1B9 Microwires to Be Used for Magnetic and Microwave Absorbing Purposes

“…No changes in the energy position at the absorption edge of the XANES spectra are observed (first peak located at the same position in the first-derivative spectra in the inset of Figure a). These results evidence the same valence state for as-cast MWs before and after annealing performed at 550 °C, and Fe foil (oxidation state 0). − …”

“…No changes in the energy position at the absorption edge of the XANES spectra are observed (first peak located at the same position in the first-derivative spectra in inset of Figure 7a). These results evidence the same valence state for as-cast MWs, after annealing performed at 550 ºC and Fe foil (oxidation state 0) [46][47][48][49]. The short range structure of Fe ions for as-cast amorphous MWs and after the annealing process is also evaluated by EXAFS measurements.…”

Ultrafast Particle Size Reduction of Fe73.9Si15.5Cu1Nb3B6.6 by High-Energy Milling: Nb2O5 as a Marker of Permeability Enhancement and Magnetic Hardening

“…The Raman bands are located at 121 cm –1 (V1, vibrations of NbO 6 octahedrons as a whole), 232 and 310 cm –1 (V2 and V3, bending modes of Nb–O–Nb linkages located inside the octahedrons and tetrahedrons), 690 cm –1 (V4, stretching modes of Nb–O bonds), and 820 cm –1 (V5, symmetric stretching modes of NbO). , If it is compared with a Raman spectrum acquired from commercial reference powder, its determination is verified, and the differences found between them are probably due to size effects confined to the nanoscale. − This is a broadening of the bands accompanied by an increase in the position of the bands toward higher Raman frequencies for smaller particle sizes. In addition, the band located around 960 cm –1 (V5) is magnified in intensity with respect to the reference powder (Figure b).…”

“…69,70 If it is compared with a Raman spectrum acquired from commercial reference powder, its determination is verified and the differences found between them are probably due to size effects confined to the nanoscale. [71][72][73] This is a broadening of the bands accompanied by an increase in the position of the bands towards higher Raman frequencies for smaller particle sizes. In addition, the band located around 960 cm -1 (V5) is magnified in intensity with respect to the reference powder (Figure 6b).…”

Crystal growth control of rod-shaped ε-Fe2O3 nanocrystals

“…S5 †), which is not observed in the XRD measurement. 38 Another reason, it is speculated that when the particle shape becomes elongated into a rod, the particles are likely to overlap with each other due to the magnetic force. The rod-shaped 3-Fe 2 O 3 particle is conrmed to be a single domain magnet.…”