Influence of imidazolium-based ionic liquids on the performance of polyaniline–CoFe2O4 nanocomposites

Leng, Chunjiang; Wei, Jianhong; Liu, Zhengyou; Shi, Jing

doi:10.1016/j.jallcom.2010.11.197

Cited by 42 publications

(10 citation statements)

References 32 publications

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“…As a magnetic material, CoFe 2 O 4 , one of the most important spinel ferrites, exhibits negative surface charge without any surfactant and shows a relatively large magnetic hysteresis that is different from that of other spinel ferrites such as superparamagnetism ferrites. It has very broad prospects in various applications such as high-density recording media and magnetic fluids because of its unique physical and chemical properties, large magnetocrystalline anisotropy, high coercivity, moderate saturation magnetization, large magnetostrictive coefficient, chemical stability, and mechanical hardness. − However, the question of how to combine a magnetic component with a polymer remains the focus of intensive investigations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Zhong

Peng

et al. 2013

Ind. Eng. Chem. Res.

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A novel one-step solvothermal method was developed and polystyrene (PS)–cobalt ferrite (CoFe2O4) composite nanomaterial (PS–CoFe2O4) was successfully synthesized by this method using ferric chloride hexahydrate (FeCl3·6H2O), cobalt chloride hexahydrate (CoCl2·6H2O), and the monomer styrene as the precursors. Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM) demonstrated the successful preparation of the PS–CoFe2O4 composite material, with the two phases of polystyrene and CoFe2O4 being hybridized at the nanoscale and some strong interaction existing between them. The results of thermogravimetric analysis (TGA) indicated that the inorganic component could improve the thermal stability of the polymer PS. Importantly, the magnetic properties of the as-prepared PS–CoFe2O4 samples were found to be superior to those of pure CoFe2O4, prepared under the same conditions (180 °C for 12 h). The improved magnetic properties can mainly be attributed to the hybrid structure, the high degree of crystallinity, and the size of CoFe2O4 in the composite material.

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Section: Introductionmentioning

confidence: 99%

Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Zhong

Peng

et al. 2013

Ind. Eng. Chem. Res.

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“…Because the chain of PANI contains a large number of rigid benzene ring, the PANI has not only the properties of periodic parallel and perpendicular but a certain degree of crystallinity. So the PANI has two relatively X-ray broad diffraction patterns [13,14]. All these reveal the formation of the PANI-Co0.7Cr0.1Zn0.2Fe2O4 ferrite composite.…”

Section: Resultsmentioning

confidence: 88%

Microwave Absorbing and Magnetic Properties of the Polyaniline-Co0.7Cr0.1Zn0.2Fe2O4 Composites

Meng

Wang

Jiang

et al. 2016

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The spinel cobalt chromium zinc ferrites (Co0.7Cr0.1Zn0.2Fe2O4) and the polyaniline (PANI)-Co0.7Cr0.1Zn0.2Fe2O4 composites were prepared by polyacrylamide gel and an in situ polymerization method, respectively. The structure of the synthesized material was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FT-IR), which shows that the spinel Co0.7Cr0.1Zn0.2Fe2O4 ferrites and the PANI-Co0.7Cr0.1Zn0.2Fe2O4 composites are obtained. Because a small amount Co 2+ ion of the octahedron ferrite is replaced by Cr 3+ ions, the lattice constant of the Co0.8Zn0.2Fe2O4 ferrites reduces from 0.8409 nm to 0.8377 nm. The magnetic properties of the two materials were investigated using vibrating sample magnetometer (VSM). The VSM results confirm that the saturation magnetization (Ms), remnant magnetization (Mr) and coercive force (Hc) of the PANI-Co0.7Cr0.1Zn0.2Fe2O4 composites are 8.80 emu/g, 3.14 emu/g and 37.22 kA/m, respectively, which are smaller than those of the Co0.7Cr0.1Zn0.2Fe2O4 ferrites. The microwave absorbing capability of the two materials were studied by wave-guide method. In the measuring frequency range of 5.0 ~ 20.0 GHz, two reflection loss maximum value of the PANI-Co0.7Cr0.1Zn0.2Fe2O4 composites appear at 14.1 GHz and 17.9 GHz with-13.17 dB and-15.36 dB, respectively, which is obviously higher than those of the Co0.7Cr0.1Zn0.2Fe2O4 ferrites.

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“…20°. These broad peaks, which are due to the scattering from the periodicity perpendicular and parallel to PANI chains, respectively, are indicative of predominantly amorphous PANI-based materials. − Moreover, the XRD patterns show no peaks associated with crystalline metallic species. These results indicate that metal-functionalized PANI–PA hydrogels have similar underlying polymeric structures to the pristine hydrogel.…”

Section: Resultsmentioning

confidence: 99%

Metal-Functionalized Hydrogels as Efficient Oxygen Evolution Electrocatalysts

Tang

Thomas

Ramírez‐Hernández

et al. 2022

ACS Appl. Mater. Interfaces

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Conductive polymer hydrogels have large surface areas and electrical conductivities. Their properties can be further tailored by functionalizing them with metals and nonmetals. However, the potential applications of metal-functionalized hydrogels for electrocatalysis have rarely been investigated. In this work, we report the synthesis of transition-metal-functionalized polyaniline–phytic acid (PANI–PA) hydrogels that show efficient electrocatalytic activities for the oxygen evolution reaction (OER). Among the many transition metals studied, Fe is accommodated by the hydrogel the most due to the favorable affinity of the PA groups in the hydrogel for Fe. Meanwhile, those containing both Fe and Co are found to be the most effective electrocatalysts for OER. The most optimized such hydrogel, NF@Hgel-Fe0.3Co0.1, which is made using a solution that has a 3:1 ratio of Fe and Co, needs an overpotential of only 280 mV to catalyze OER in 1 M KOH solution with a current density of 10 mV cm–2. Furthermore, these metal-functionalized PANI–PA hydrogels can easily be loaded on the nickel foam or carbon cloth via a simple soak-and-dry method to generate free-standing electrodes. Overall, this work demonstrates a facile synthesis and fabrication of sustainable and efficient OER electrocatalysts and electrodes that are composed of easily processable hydrogels functionalized with earth-abundant transition metals.

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Influence of imidazolium-based ionic liquids on the performance of polyaniline–CoFe2O4 nanocomposites

Cited by 42 publications

References 32 publications

Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Microwave Absorbing and Magnetic Properties of the Polyaniline-Co0.7Cr0.1Zn0.2Fe2O4 Composites

Metal-Functionalized Hydrogels as Efficient Oxygen Evolution Electrocatalysts

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Influence of imidazolium-based ionic liquids on the performance of polyaniline–CoFe2O4 nanocomposites

Cited by 42 publications

References 32 publications

Synthesis of PS–CoFe2O4Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Synthesis of PS–CoFe2O4Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Microwave Absorbing and Magnetic Properties of the Polyaniline-Co0.7Cr0.1Zn0.2Fe2O4 Composites

Metal-Functionalized Hydrogels as Efficient Oxygen Evolution Electrocatalysts

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Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method

Synthesis of PS–CoFe₂O₄Composite Nanomaterial with Improved Magnetic Properties by a One-Step Solvothermal Method