Preparation, magnetic and electromagnetic properties of polyaniline/strontium ferrite/multiwalled carbon nanotubes composite

Li, Yuqing; Huang, Ying; Qi, Shuhua; Niu, Lei; Zhang, Yinling; Wu, Yunhai

doi:10.1016/j.apsusc.2011.12.001

Cited by 75 publications

(26 citation statements)

References 27 publications

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“…As the electromagnetic energy loss due to absorption is the combined effects of both the dielectric and magnetic components of the synthesized composites, the algebraic sum of both tangential losses is equal to the gross loss angle tangent [27]. The significantly big difference between the magnitude of the dielectric and magnitude loss angle tangent observed for all synthesized samples suggests that the main mechanism of absorption is the dielectric losses.…”

Section: Electromagnetic Characterizationmentioning

confidence: 92%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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Abstract-An electromagnetic interference (EMI) shielding material based on the composite of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) was proposed. The constituents of the composite were brought together through mechanical mixing and the in-situ polymerization of aniline on the BaFe 12 O 19 and MWCNT surfaces. A series of composite with different MWCNT wt% loadings (0, 5, 10, 15, 20 and 25wt%) was prepared, and its effect on the EMI shielding performance was investigated. X-ray diffraction analysis was performed on all synthesized composites to confirm the phase formations. FESEM micrographs reveal the PANI particle formation on both BaFe 12 O 19 and MWCNT surfaces. Electromagnetic measurements were done by using a rectangular waveguide connected to a network analyser to obtain the permeability, μ r , permittivity, ε r , and shielding effectiveness (SE A and SE R ). The increase in the MWCNT loading results in the enhancement of the composite's shielding performance to a certain limit. Optimum EMI shielding performance is shown by sample PBM4 (20wt% MWCNT) with SE R and SE A values of 5.14 dB at 8.2 GHz and 36.41 dB at 12.4 GHz, respectively. The influence of different MWCNT loadings (0, 5, 10, 15, 20 and 25wt%) on the EMI shielding performance of a composite consisting of BaFe 12 O 19 , polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) were investigated.

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Section: Electromagnetic Characterizationmentioning

confidence: 92%

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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“…Além disso, a PAni pode se comportar como um polímero intrinsecamente magnético [8] e suas propriedades magnéticas são frequentemente melhoradas de modo extrínseco, via inserção de partículas magnéticas [9][10][11] na matriz condutora. Esses híbridos formados pela fração inorgânica confinada no polímero condutor combinam as vantagens dos materiais inorgânicos e orgânicos [9,10] e vem sendo cada vez mais estudados. Como exemplo, uma análise bibliométrica usando os termos polyaniline and maghemite (pesquisa feita em julho de 2013 no sítio http://www.sciencedirect.com) retorna, referente aos últimos dez anos, um total de 137 publicações.…”

Section: Introductionunclassified

Preparo de nanocompósitos maghemita e polianilina assistido por ultrassom

Costa¹,

Souza²

2014

Polímeros

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Resumo: O estudo de sistemas envolvendo nanopartículas de óxido de ferro e polianilina vem ganhando importância nos últimos anos. Entre esses trabalhos, ainda há um pequeno número de pesquisas que abordam o efeito da sonicação sobre o preparo desses híbridos. Assim, o presente trabalho teve como objetivo avaliar o efeito da sonicação sobre as propriedades de nanopartículas de maghemita revestidas com polianilina, via planejamento fatorial. Os materiais obtidos foram estudados por espectroscopia no infravermelho, difração de raios X e por análise termogravimétrica. As amostras também tiveram a resistividade elétrica e a força magnética investigadas. Os resultados obtidos demonstram que o aumento da potência de sonicação é capaz de produzir um considerável aumento da extensão do grau de dopagem, associado com a diminuição da resistividade das amostras. Por outro lado, a mesma potência de sonicação produziu a destruição de grande parte da maghemita presente, levando a menores forças magnéticas. Palavras-chave: Dispersão ultrassônica, polimerização in situ, planejamento experimental. Preparation of Maghemite and Polyaniline Nanocomposites Assisted by UltrasoundAbstract: The study of systems constituted by iron oxide nanoparticles and polyaniline has increased in the last years. However, few studies are related to the sonication effect on the preparation of these hybrid materials. In this work the effect of sonication on the properties of maghemite/polyaniline hybrids was studied using experimental design techniques. The materials obtained were studied by infrared spectroscopy, X-ray diffraction and thermogravimetric analysis. Samples were also characterized by measuring the electric resistivity and by magnetic force tests. Obtained results show that the increase of the sonication power produces the increase of the doping process and the decrease of the electrical resistivity. The same sonication power produced the destruction of a large amount of the maghemite, leading to lower magnetic forces.

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“…A possible reason for the observation is that the introduction of MWCNT leads to the increase in output of the polymer due to the higher surface area for the reaction [12]. This would also lead to a relative decrease in the BaFe 12 O 19 content within the composite, causing the reduction in the peak intensity of the characteristic peaks attributed to the ferrite.…”

Section: Resultsmentioning

confidence: 99%

ELECTROMAGNETIC INTERFERENCE (EMI) SHIELDING PERFORMANCE OF THE TERNARY COMPOSITE BASED ON BAFE<sub>12</sub>O<sub>19</sub>, MWCNT AND PANI AT THE KU-BAND

Zahari¹,

Guan²,

Cheng³

et al. 2016

PIER M

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Abstract-A ternary composite, based on the M-type hexagonal barium ferrite, BaFe 12 O 19 , conducting polymer, polyaniline (PANI), carbon allotrope, and multi-walled carbon nanotube (MWCNT), was prepared through a facile in-situ polymerization process. The structural properties of the synthesized composites were characterized through XRD and FESEM analysis. PANI particles were found to be able to coat on BaFe 12 O 19 and MWCNT surfaces. The increased MWCNT wt% loading within the composite resulted in the increase of the electrical conductivity with values as high as 2.0320 S/m for sample PBM5 (25wt% MWCNT). The composite inherited the salient properties of its respective components to achieve optimum values of shielding effectiveness. The highest value of SE A recorded was 42.37 dB at 17.60 GHz. The significantly larger magnitudes of SE A than SE R suggest that the mechanism of shielding for all synthesized composites are through absorption.

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Preparation, magnetic and electromagnetic properties of polyaniline/strontium ferrite/multiwalled carbon nanotubes composite

Cited by 75 publications

References 27 publications

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Emi Shielding Effectiveness of Composites Based on Barium Ferrite, Pani, and MWCNT

Preparo de nanocompósitos maghemita e polianilina assistido por ultrassom

ELECTROMAGNETIC INTERFERENCE (EMI) SHIELDING PERFORMANCE OF THE TERNARY COMPOSITE BASED ON BAFE<sub>12</sub>O<sub>19</sub>, MWCNT AND PANI AT THE KU-BAND

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