Morphological studies of randomized dispersion magnetite nanoclusters coated with silica

Magnetic HMS silica as a Support to Immobilization of Catalysts Based on Cationic Manganese Porphyrins

“…The large‐angle XRD pattern of the Mag particles (Figure b) shows peaks between 18 and 70°, i. e., 2θ= 18, 30, 35, 43, 53, 57 and 62, corresponding to the d hkl crystal planes (111), (220), (311), (400), (422), (511) and (440), respectively, which can be indexed to the spinel structure of pure stoichiometric magnetite (Fe 3 O 4 ), and are consistent with the standard pattern for Fe 3 O 4 (JCPDS, card 1–1111) ,. These same patterns observed along with a broad diffraction peak around 20–30°(2θ) were attributed to HMS silica, after coating Mag to yield HMS‐Mag and immobilization of the MnP2 to yield MnP2‐HMS‐Mag , suggesting that the crystalline phase of Fe 3 O 4 remained unchanged after the coating and immobilization procedures …”

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

“…The saturation magnetization (Fig. 3), Ms, gradually decreases from 26.0 emu/g for MS1 to 7.8 emu/g for MS2 and then to 0.8 emu/g for MS3, as the γ-Fe 2 O 3 /SiO 2 ratio decreases, in accordance with the literature data [29,38].…”

Olefins oxidation with molecular O2 in the presence of chiral Mn (III) salen complex supported on magnetic CoFe2O4@SiO2@CPTMS

“…The bands at 1099 cm −1 is assigned to the stretching mode of the Si‐O‐Si bond in silica and the bond at 467 cm −1 is belonging to Si‐O‐Si bond (Fig. b) . By modification of CPTMS onto the CoFe 2 O 4 @SiO 2 , the new peaks at 2850 and 2924 cm −1 is observed which are assigned to the stretching vibration of C‐H alkane (Figure c) …”