Synthesis and characterization of a magnetic hybrid material consisting of iron oxide in a carboxymethyl cellulose matrix

Abstract

A magnetic hybrid material (MHM), consisting of iron-oxide nanoparticles (~4 nm) embedded in sodium carboxymethyl cellulose (Na-CMC) matrix was synthesized. The MHM synthesis process was performed in two stages. First, a precursor hybrid material (Fe(II)-CMC) was synthesized from two aqueous solutions: Na-CMC solution and FeCl 2 solution. In the second stage, the precursor hybrid material was treated with H 2 O 2 under alkaline conditions to obtain the MHM. The results obtained from X-ray diffraction show that the crystalline structure of iron oxide into MHM corresponds to maghemite or magnetite phase. Conversely, the results obtained from Fourier transform infrared (FTIR) spectroscopy reveal that the polymeric matrix (Na-CMC) preserves its chemical structure into the MHM. Furthermore, in FTIR spectra are identified two characteristic bands at 570 and 477 cm À1 which can be associated to maghemite phase. Images obtained by high resolution transmission electron microscopy and bright field scanning transmission electron microscope show that iron-oxide nanoparticles are embedded in the Na-CMC. Magnetic properties were measured at room and low temperature using a quantum design MPMS SQUID-VSM magnetometer. Diagrams of magnetization versus temperature show that iron-oxide nanoparticles embedded in Na-CMC have a superparamagnetic-like behavior.

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

“…The band observed at ∼3318 cm −1 in all the samples corresponds to hydroxyl groups of CNF . The band observed around 2915 cm −1 can be assigned to C−H vibrations . In CNF/PVA sample the band obtained at ∼1642 cm −1 is related to C=O groups of CNF .…”

“…The analysis of the IR data of the composites suggest that Ag NPs and CNF/PVA form stable composite via electrostatic interaction between negatively charged carboxylic groups and positively charged groups on the Ag NPs. Similar results were observed previously in other inorganic nanomaterials and cellulose composites …”

Oil‐spill cleanup: The influence of acetylated curaua fibers on the oil‐removal capability of magnetic composites

“…Pure resin showed an amorphous halo [Figure (a)], whereas maghemite [Figure (e)] showed crystalline peaks at 2θ = 30.7°, 36.2°, 43.6°, 57.7°, and 63.2°. These crystalline peaks correspond to the (2 2 0), (3 1 1), (4 0 0), (5 1 1), and (4 4 0) reflections, respectively, of a spinel crystal structure, such as that presented by maghemite . In addition, the crystallinity degree was calculated according Ruland's method and crystal sizes were calculated using Scherer's equation (eq.…”

Magneto-sensitive hybrid nanocomposites of water-soluble sodium alginate cross-linked with calcium ions and maghemite

“…For the reference samples of magnetite and maghemite, the corresponding values were taken from the ICDD database (represented in Ref. [24]). Comparison of the experimental and reference values indicated the crystalline lattice and quadrupole splitting Q s = 1.11 mm/s) were detected in this spectrum [45,46].…”

“…Magneto-sensitive hybrid nanocomposites of water-soluble sodium alginate cross-linked with calcium ions and maghemite groups, synthetic and natural polyelectrolytes, including chitosan, alginic acid and carboxymethyl cellulose [22][23][24]. The presence of charged functional groups in this case allows polymers to chemically interact with the surface of nanoparticles.…”