Ferromagnetic behaviour of polyaniline-coated multi-wall carbon nanotubes containing nickel nanoparticles

Konyushenko, Elena N.; Kazantseva, Natalia E.; Stejskal, Jaroslav; Trchová, Miroslava; Kovářová, Jana; Sapurina, Irina; Tomishko, M. M.; Demicheva, O. V.; Prokeš, Ján

doi:10.1016/j.jmmm.2007.05.036

Cited by 43 publications

(26 citation statements)

References 46 publications

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“…The shear stress of the dispersion increases with an increase in applied DC electric field for a broad range of shear rates [91][92][93]. A composite of p-tolunesulfonic acid-doped PANI-MWCNT shows good microwave absorption [94].…”

Section: Salient Propertiesmentioning

confidence: 99%

Polyaniline-carbon nanotube composites

Gajendran

Saraswathi

2008

Pure and Applied Chemistry

132

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Abstract:The key developments in polyaniline-carbon nanotube (PANI-CNT) composites are reviewed. Apart from in situ chemical polymerization and electrochemical deposition, a number of interesting approaches including the use of aniline functionalized CNTs and ultrasound/microwave/γ-radiation initiated polymerization have been used in the preparation of composites. The structure and properties of these composites have been investigated by a variety of techniques including absorption, infrared (IR), Raman, X-ray photoelectron spectroscopy methods, scanning electron and scanning probe microscopy techniques, cyclic voltammetry, and thermogravimetry. The experimental results indicate favorable interaction between PANI and CNTs. The CNT content in these composites controls their conductive, mechanical, and thermal properties. The most interesting characteristic is their easy dispersibility in aqueous solution. The performance evaluation studies of PANI-CNT composites in a number of applications including supercapacitors, fuel cells, sensors, and actuators are highlighted.

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Section: Salient Propertiesmentioning

confidence: 99%

Polyaniline-carbon nanotube composites

Gajendran

Saraswathi

2008

Pure and Applied Chemistry

132

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“…Among these properties, the extremely high conductivity and large aspect ratio are very effective for a filler in conductive composite materials. A lot of work has been done to achieve wide ranges of permittivity and conductivity [5][6][7][8][9][10][11]. A high conductivity of more than 10 3 S/m has been reported for both single-walled (SW) [12] and multi-walled (MW) [13] CNT composites, while a large real permittivity of 200 at 18 GHz has been observed for MWCNT/cellulose composite paper [14].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic absorbing materials using nonwoven fabrics coated with multi-walled carbon nanotubes

Sano

Akiba

2014

Carbon

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We calculated the complex permittivity of materials required to achieve a single-layer electromagnetic absorber with a high absorption coefficient in the 60-GHz band. The calculation results indicated that an absorption coefficient of 0.95 can be achieved for a 5-mm sheet when the real part of the relative permittivity  r ' is close to that of the free space and the conductivity  is around 3 S/m. On the basis of the findings, we developed three types of nonwoven fabrics with high porosity in which the fibers were coated with multi-walled carbon nanotubes (MWCNTs). The  r ' of 1.12-1.32 and  of 0.107-12.4 S/m were obtained depending on the porosity of the fabrics. The measured absorption coefficients reached 0.97 at 60 GHz in agreement with the calculations. The present MWCNTs-coated nonwoven fabrics will be useful materials for high performance electromagnetic absorbers.

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“…Para incorporação de 25% o compósito passa apresentar maiores valores quanto as magnetizações e campo coercivo; M s =8,40 emu/g; M r =1,06 emu/g, além dos mesmos vaores de campo coercivo H c =0,084 KOe (Figura 11b), isto muito provavelmente devido a dependência do tamanho da partícula [38] . Observa-se que tanto para o compósito desdopado como redopado, há um aumento nos valores de magnetização em função do aumento do campo magnético externo aplicado, havendo poucas perdas de energia, evidenciados pela o estreitamento na curva de histerese ao longo do eixo central, além de apresentar de baixos campos coercivos [39][40][41][42][43][44] , valores que facilitam a orientação dos domínios magnéticos das partículas e por sua vez da magnetização da amostra.…”

Section: Observaunclassified

Preparação e caracterização do compósito PVDF/Pani com partículas de níquel

et al. 2017

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ResumoNeste trabalho partículas de níquel foram incorporadas através da mistura física do pó resultante da mistura PVDF/Pani obtido por síntese química. Filmes homogêneos foram obtidos através da prensagem a temperatura de 180°C. A partir dos resultados pode-se notar alterações favoráveis e desfavoráveis nas propriedades do compósito após a incorporação e como estas tornam-se dependentes da incorporação. Os resultados de difratometria apresentaram picos característicos tanto da fase α da matriz polimérica e das partículas de níquel, e juntamente com as analises térmicas, que não há alteração na estrutura conformacional e a configuracional. Mesmo apresentando uma boa estabilidade térmica a incorporação indica que além da presença do polímero condutor como o aumento de partículas são prejudiciais às propriedades mecânicas finais da amostra. As micrografias apresentam as partículas de forma dispersas ao longo do filme e determinantes para os valores de condutividade elétrica e obtenção de uma fase magnética. Palavras-chave: polianilina, poli(fluoreto de vinilideno), níquel, compósito, propriedades magnéticas. AbstractIn this work nickel particles were incorporated by physically mixing of resulting powder blends of PVDF/Pani, obtained by chemical synthesis. Homogeneous films were obtained by hot pressing at 180 °C. From the results could be noted favorable and unfavorable changes in the properties of composites after incorporation and how this become dependent of the incorporation. The results of diffraction showed the characteristic peaks of both the α phase of the polymer matrix and the nickel particles, and with thermal analysis, no change in the conformational structure and configurational. Even with a good thermal stability incorporating, indicates that besides the presence of the conducting polymer as the increase of particles are harmful to the final mechanical properties of the sample. Micrographs showed particles dispersed throughout the film and determinants to electrical conductivity values and achieving a magnetic phase. Keywords: polyaniline, poly (vinylidene fluoride), nickel, composite, magnetic property. IntroduçãoTradicionalmente ao estudar se magnetismo e suas propriedades, em particular o ferromagnetismo, está se estudando, por exemplo, elementos inorgânicos como ferro, níquel, cobalto, ligas, cerâmicas e óxidos, os quais apresentam o comportamento magnético, e também estudos quando estes elementos são incorporados em matrizes poliméricas na forma extrínseca [1][2][3] . Porém a exploração de materiais orgânicos com a descoberta dos polímeros intrinsecamente condutores trouxe uma nova gama de questões no campo da pesquisa como novas propriedades magnéticas e óticas além da possibilidade de materiais mais leves, com alta condutividade e flexibilidade [2][3][4][5][6][7][8][9] . Assim a investigação do comportamento magnético dos polímeros condutores intrínsecos, se inclui o estudo de seus elementos constituintes, como carbono, hidrogênio, nitrogênio, anéis aromáticos e a própria conjunção e conformaç...

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Ferromagnetic behaviour of polyaniline-coated multi-wall carbon nanotubes containing nickel nanoparticles

Cited by 43 publications

References 46 publications

Polyaniline-carbon nanotube composites

Polyaniline-carbon nanotube composites

Electromagnetic absorbing materials using nonwoven fabrics coated with multi-walled carbon nanotubes

Preparação e caracterização do compósito PVDF/Pani com partículas de níquel

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