Poly(styrene–b–ethylene/butylene–b–styrene)/cobalt ferrite magnetic nanocomposites

Abstract

Magnetic nanoparticles were created in or around the sulfonated (s) polystyrene domains in a poly[styrene-b-(ethylene-co-butylene)-b-styrene)] block copolymer (BCP) using an in situ inorganic precipitation procedure. The sBCP was neutralized with a mixed iron/cobalt chloride electrolyte, and the doped samples were converted to their oxides by reaction with sodium hydroxide. Transmission electron microscopy indicated the presence of nanoparticles having diameters of 20-50 nm. Metal oxide particle structures were studied using wide angle X-ray diffraction, which revealed that they were inverse spinel cobalt iron oxide crystals. Thermogravimetric analysis provided the weight percent of the inorganic component and nanocomposite thermal decomposition profile. Modulated differential scanning calorimetry studies suggested that the inorganic inclusions were selectively grown in the polystyrene hard block phase. These nanocomposites were shown, using alternating gradient magnetometry, to be ferrimagnetic at room temperature.

Novel electrically conductive and ferromagnetic composites of poly(aniline‐co‐aminonaphthalenesulfonic acid) with iron oxide nanoparticles: Synthesis and characterization

“…The temperature range of 30-8008C is usually sufficient to determine decomposition temperatures of composites and wt % of Fe 3 O 4 in the composites. 28,29,34,40,50 Beyond 8008C, significant changes was not observed. PANI or SPAN-ANSA can undergo degradation via two or three steps: expulsion of absorbed water/moisture, decomposition of dopants or SO À 3 units, and decomposition of polymer chains.…”

Structured elastomeric submillimeter films displaying magneto and piezo resistivity

“…In summary, the structure induced in the material is the first aspect on which to remark, because it decreases the percolation critical point to observe conductivity and induces anisotropic properties in the material. Thus, the physical properties of structured systems are different than random filler–matrix composites including those where the fillers are synthesized within the polymer using in situ procedures …”

Thermoelastic-tunable magnetic response of BiFeO3thin film on colloidal photonic crystal substrate fabricated by pulsed laser deposition

“…00‐014‐0181), are superimposed on the X‐ray pattern of the amorphous CPC substrate. Other magnetic nanocomposite structures show poor diffraction pattern due to their small crystalline size and amorphous background . Nonetheless, the BFO phase was predominant, with only a minor peak originating mainly from the parasitic phases of Bi oxides, but no impurities related to Fe oxides like the XRD of its ablation target.…”