On the possibility of using short chain length mono-carboxylic acids for stabilization of magnetic fluids

Interaction of mono-carboxylic acids in benzene studied by small-angle neutron scattering

“…After Shen et al [4] who probed short chain length monocarboxylic acids in the stabilization of water-based ferrofluids, it was recently shown [5] that myristic acid (MA) (CH 3 (CH 2 ) 12 COOH) and lauric acid (CH 3 (CH 2 ) 10 COOH) reveal better possibility for stabilizing magnetite in non-polar organic liquids as compared to stearic acid. However, the size and dispersity of magnetic particles stabilized by myristic and lauric acids are significantly smaller than in the case of stabilization by oleic acid, while the effective thickness of the surfactant layer is approximately the same.…”

“…However, the size and dispersity of magnetic particles stabilized by myristic and lauric acids are significantly smaller than in the case of stabilization by oleic acid, while the effective thickness of the surfactant layer is approximately the same. Thus, the efficiency of stabilization of mono-carboxylic acids was related [5] to repulsion properties of the surfactant layer around magnetite, which determine the stable size distribution of magnetic particles in ferrofluids. If oleic acid is proved to be highly efficient surfactant to stabilize nanomagnetite over the wide interval of radii of 1-10 nm (result of condensation reaction), myristic and lauric acids stabilize partially this interval dispersing in the carrier only a fraction of smaller particles.…”

Magnetite nanoparticles stabilized with polymeric bilayer of poly(ethylene glycol) methyl ether–poly(ɛ-caprolactone) copolymers

“…The particles are usually stabilized by charge repulsion of electrical double layers [13] or steric repulsion of long-chain polymeric surfactants adsorbed on their surfaces to prevent approaching from neighboring particles [14]. Oleic acid has been markedly used as a steric stabilizer to form magnetite nanoparticles dispersed in organic solvents [15][16][17]. The stabilizing mechanism of the particles was proposed that carboxylate groups partitioned on the particle surface and formed a brush layer of long-chain hydrocarbon to sterically stabilize the particles in dispersions [18,19].…”

Hydrophobically Coated Superparamagnetic Iron Oxides Nanoparticles Incorporated into Polymer-Based Nanocapsules Dispersed in Water

“…Hydrophobic coatings enable the dispersibility of particles in various nonpolar solvents and limit their aggregation, which leads to better monodispersity of their sizes, thereby allowing controlled properties [24][25][26]. To obtain such features, carboxylic acids or alkyl phosphates are most often used, while oleic acid was shown to offer very good stability and dispersibility of coated nanoparticles in nonpolar solvents [27]. These size restrictions can be overcome in the high-temperature thermal decomposition method.…”

“…By applying a magnetic field, such carriers are able to achieve the desired position in a more precise and controllable way [29,30]. Furthermore, such platforms can also be used for magnetically controlled (bio)reactors, enabling reactions between components transported via facile magnetic remoting, even with nanoliter volumes [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. We only recently presented polymer-based nanocapsules stabilized using a modified polysaccharide with an oleic acid liquid containing suspended MNPs, showing that they can be navigated using a static magnetic field [34].…”