Iron oxide in a silica matrix prepared by the sol–gel method

Magnetic solid phase adsorption, preconcentration and determination of methyl orange in water samples using silica coated magnetic nanoparticles and central composite design

“…The spectrum shows the core shell of the particles with Si-O on the surface. The Broad peak at 3,447 cm -1 could be correlated to the vibration of structural OH [35]. The bands at 1,083, 800 and 452 cm -1 are attributed to the asymmetric Si-O-Si stretching vibration, the symmetric Si-O-Si stretching vibration and the O-Si-O shearing vibration, respectively [36,37].…”

“…These results suggested that the Fe-SiO 2 interaction exists in the catalyst in the form of Fe-O-Si structure. The band at 551 cm -1 can be assigned to the Fe-O stretching in Fe-O-Si bonds [35].…”

Removal of Arsenic (III) from natural contaminated water using magnetic nanocomposite: kinetics and isotherm studies

“…The Ti-O-Si infrared vibration is generally observed between 910 and 960 cm −1 [48,49] with the exact band position depending on the chemical composition of the sample as well as calibration and resolution of the instrument. In the spectrum of pure TiO 2 , the peak at 550 cm [51]. The specific surface area (using BET method), total pore volume and the mean pore diameter were measured using a N 2 adsorption-desorption isotherm at liquid nitrogen temperature (−196 °C).…”

Phase transformation and exchange bias effects in mechanically alloyed Fe/magnetite powders

“…Our patterns show large overlapped Bragg peaks, especially at low temperatures. In intermetallic alloys such large patterns are characteristic of materials with small nano-crystals [9][10][11] with structural disorder [12,13] or predominant amorphous-like structure [14]. Therefore, in order to correctly deconvolute and assign the observed peaks, a refinement fitting procedure had to be performed.…”