The effect of tetraethyl orthosilicate (TEOS) additions as silica precursors on the magnetite nano-particles (Fe3O4) properties for the application of ferro-lubricant

Zn2+ removal from the aqueous environment using a polydopamine/hydroxyapatite/Fe3O4 magnetic composite under ultrasonic waves

“… 4 The presence of non-magnetic particles such as HAp and PDA in the structure of Fe 3 O 4 reduces the magnetic torque. 39 As a result, the amount of magnetic saturation decreases, confirming the qualitative composition of HAp/Fe 3 O 4 and PDA/HAp/Fe 3 O 4 . Although the magnetic saturation of both HAp/Fe 3 O 4 and PDA/HAp/Fe 3 O 4 magnetic composites decreased in comparison to Fe 3 O 4 , it is sufficient for magnetic separation from aqueous solutions.…”

Exploring the Effect of Glycerol and Hydrochloric Acid on Mesoporous Silica Synthesis: Application in Insulin Loading

“…In the spectrum of TEOS, asymmetric and symmetric (CH 3 ) stretching were accountable for the bands found at 2974 and 2889 waves/cm, respectively, while the band located at 1167 could be due to (C–OH) stretching. − Bands at 1099, 961, and 475 waves/cm were due to asymmetric stretching vibration of (Si–O), (Si–O) pending vibration of noncondensed silanol groups, and (Si–O) bending vibration. The bands at 2974, 2889, and 1167 waves/cm faded after calcination, and only the bands at 1099, 961, and 475 waves/cm remained in the MPS spectrum, representing the characteristic features of MPS.…”

A manganese(iii) Schiff base complex immobilized on silica-coated magnetic nanoparticles showing enhanced electrochemical catalytic performance toward sulfide and alkene oxidation

“…The observed decrease in the saturation magnetization of Fe 3 O 4 @SiO 2 as compared to that of the pure Fe 3 O 4 MNPs could be due to the interaction between the iron core and the silica shell, which decreased the magnetic moment. 41 Moreover, the saturation magnetization of silicacoated Fe 3 O 4 signicantly decreased with the attachment of the Mn-Schiff base complex via axial coordination. However, in the case of both the core-shell magnetic nanoparticles and the heterogenized nanocatalyst, these values were still sufficiently large, facilitating the easy separation of nanoparticles by an external magnet.…”