Mesostructured iron and manganese oxides

Tuning the morphology of PVDF membranes using inorganic clusters for oil/water separation

“…It is observed that the OH stretching vibration shifted from 3416 to 3446 cm −1 clearly indicating the presence of hydrogen bonding resulting in the fiber formation, and is similar to the bonding of iron acetylacetonate treated with ethanol reported by Wang et al . From the FTIR results, the formation of iron alkoxide with the formulae [Fe 3 (OCH 3 ) 2 (CH 3 COO) 5 ]·2CH 3 OH is proposed . The following characterizations concordantly confirm that the iron compound formed on treatment of iron(III) acetate with methanol is an inorganic metal cluster (iron alkoxide) and this is similar to the work reported by Koket et al ., where an iron cluster was formed when raw iron acetylacetonate was treated with ethanol.…”

“…The bands at 1588 and 1390 cm −1 are assigned to ν as (COO) and ν s (COO), respectively; and the band separation value 202 cm −1 clearly indicates the existence of a unidentate mode of acetate bonding with the iron center. After the methanol treatment, a new band at 1041 cm −1 was assigned to OCH 3 stretching; the peaks at 1533 and 1437 cm −1 correspond to ν as (OCO) and ν s (OCO), respectively; and the band separation value of 102 cm −1 implies the formation of a bidentate mode of carboxylate ligand . It is observed that the OH stretching vibration shifted from 3416 to 3446 cm −1 clearly indicating the presence of hydrogen bonding resulting in the fiber formation, and is similar to the bonding of iron acetylacetonate treated with ethanol reported by Wang et al .…”

Surfactant mediated nanoparticle assembly of catalytic mesoporous crystalline iron oxide materials

“…They were unfortunately unstable and collapse upon surfactant removal, in spite of their super-antiferromagnetism. Very recently, Malik et al [17] synthesized the mesostructured iron and manganese oxides by using the carboxylate and amine surfactants, but their surfactants were still difficult to be totally removed without collapse of the mesostructures. A sonochemical technique was used to synthesise mesoporous iron oxide from the precursor of iron(III) ethoxide and surfactant CTAB, but the pores of iron oxide were not homogenous, though a high catalytic activity on cyclohexane oxidation was observed for the mesoporous iron oxide [18].…”

Synthesis of Mesoporous α-Fe2O3 Nanoparticles by Non-ionic Soft Template and Their Applications to Heavy Oil Upgrading

“…In this synthetic route, the hard template plays a role of structural materials restricting crystalline growth to the void space, leading to subsequent replica production. A synthetic route via soft template employs the self-assembly induced by amphiphilic block copolymers or surfactants215161718. Typically the synthetic routes are carried out in a relatively facile and simple way because it doesn’t require any prior fabrication steps of template, which must be prepared by using another template.…”