“…Preparation of Magnetic-Nanoparticle-Loaded Polyelectrolyte Brushes: To synthesize magnetic nanoparticles within the brushes, a patterned brush sample was dipped into a solution of FeSO 4 (1.9 Â 10 À5 M, 5 mL) and Fe 2 (SO 4 ) 3 (2.1 Â 10 À5 M, 5 mL) for 12 h. Precipitation from aqueous FeSO 4 solutions can be used in the synthesis of iron oxides such as a-FeOOH (goethite), g-FeOOH (lepidocrocite), a-Fe 2 O 3 (hematite), and Fe 3 O 4 (magnetite), as follows [40];…”
Polyelectrolyte brushes loaded with magnetic nanoparticles can be formed through the reaction of immobilized Fe2+/3+ ions in the brush. These particles show very unusual magnetic properties, not normally associated with such small nanoparticles. Upon application of an external magnetic field, the brushes showed reversible dimensional changes.
“…Preparation of Magnetic-Nanoparticle-Loaded Polyelectrolyte Brushes: To synthesize magnetic nanoparticles within the brushes, a patterned brush sample was dipped into a solution of FeSO 4 (1.9 Â 10 À5 M, 5 mL) and Fe 2 (SO 4 ) 3 (2.1 Â 10 À5 M, 5 mL) for 12 h. Precipitation from aqueous FeSO 4 solutions can be used in the synthesis of iron oxides such as a-FeOOH (goethite), g-FeOOH (lepidocrocite), a-Fe 2 O 3 (hematite), and Fe 3 O 4 (magnetite), as follows [40];…”
Polyelectrolyte brushes loaded with magnetic nanoparticles can be formed through the reaction of immobilized Fe2+/3+ ions in the brush. These particles show very unusual magnetic properties, not normally associated with such small nanoparticles. Upon application of an external magnetic field, the brushes showed reversible dimensional changes.
“…Finally, treatment with NaBH 4 and NaOH was followed for the synthesis of silver nanoparticles and goethite nanocrystals, respectively. Goethite nanocrystals are formed according to the following reactions 1 Schematic illustration of the procedures used in the fabrication of PEMCRs via the layer-by-layer assembly method using PSS−PAA/PAH and the synthesis of two types of nanoparticles within the shell of PEMCRs in the Fe−Ag reaction sequence.…”
Polyelectrolyte multilayer capsule reactors (PEMCRs) for the synthesis of two types of nanoparticles were prepared. The tunable PEMCRs containing two different functional groups that can be used to synthesize two types of nanoparticles simultaneously and to control the composition of two types of nanoparticles within the shell of PEMCs. These PEMCRs enabled the composition as well as the amount of the loaded two types of nanoparticles within the shell of PEMCs to be controlled by the copolymer ratio and the number of reaction cycles. Another interesting finding is that, as a result of the synthesis of two types of nanoparticles, these specially designed PEMCs containing both silver and goethite nanocrystals can be used as antimicrobial capsules, which can move by an external magnetic field. Such a technology has the potential for use in sterilization at the desirable sites.
“…In most commercial processes, goethite ( -FeOOH) particles are produced as an intermediate in the iron oxide preparation (1)(2)(3)(4). The goethite crystals grow in the form of acicular needles about 0.1-1 m long with an aspect ratio of 5-15.…”
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