Functional Group and Magnetic Properties of Fe₃O₄ Ferrofluids: The Impact of Dispersion Agent Composition

Synthesis of Fe3O4/Ag nanohybrid ferrofluids and their applications as antimicrobial and antifibrotic agents

“…Meanwhile, peaks of functional groups of Ag were detected at 1652 cm À1 (N-Ag) and 3002 cm À1 (C-Ag) [44]. Oleic acid as the first layer was detected by the appearance of a C¼C vibration at 1312 cm À1 [13], carboxyl group (COO À ) vibrations at 1401 and 1444 cm À1 [45], and CH 2 vibrations at 2849 and 2910 cm À1 [46]. In addition, DMSO as the second layer was detected by the appearance of peaks of S¼O vibrations at 941 and 1022 cm À1 [47].…”

“…In addition, Fe 3 O 4 nanoparticles have a low ability to penetrate bacterial or fungal membranes, which restricts their ability to inhibit microbial growth [12]. Fe 3 O 4 nanoparticles also tend to be easily oxidized, which adversely affects their physical and chemical stability [13]. Therefore, in the present study, we combine Fe 3 O 4 nanoparticles with Ag, which exhibits excellent antimicrobial performance, by preparing Fe 3 O 4 /Ag nanocomposites as the fillers in ferrofluids.…”

“…The classic problem that causes difficulty in attaining stable ferrofluids is the tendency of Fe 3 O 4 to agglomerate as a result of van der Waals forces [18], which interfere with the single-domain formation of magnetic nanoparticles. Thus far, to solve such problems, extensive effort has been devoted to coating the fillers in ferrofluids with various surfactants, such as oleic acid [13], other carboxylic acids [19], and tetramethylammonium ion [20], using a monolayer technique. In principle, surfactants were subject to coat magnetic nanoparticle fillers so that they remain stable under an external magnetic field [21].…”

The optimization effect of different parameters on the super hydrophobicity of prickly-shaped carbonyl iron particles

“…The slight decrease in the magnetic saturation of these particles is due to the non-magnetic modification of these particles. 41 …”

Excellent antimicrobial performance of co-doped magnetite double-layered ferrofluids fabricated from natural sand

“…Furthermore, the decrease in particle size enhanced the forces on the surface of nanoparticles so that the absorption band of FTIR spectrum shifted to a higher wavenumber known as the blue shift phenomenon ( Jafari et al, 2015 ). The functional group of oleic acid as the first layer was observed at 1315 and 1377 cm −1 , which represented the C C from oleic acid ( Taufiq et al, 2018 ). Meanwhile, the stretching band that represented the carboxyl group (COO − ) was observed at 1456 cm −1 ( Marinca et al, 2016 ).…”