Heterogeneous preparation of cellulose–polyaniline conductive composites with cellulose activated by acids and its electrical properties

Mo, Zunli; Zhang, Zhao; Chen, Hong; Niu, Guiping; Shi, Huafeng

doi:10.1016/j.carbpol.2008.09.010

Cited by 130 publications

(64 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A small difference can also be observed between absorption bands of Zn-O and a slight shift to a lower wave number due to a change in the lattice parameters of the ZnO nanoparticles (Khorsand-Zak et al 2011). In addition, the peaks at 3337 cm -1 and 1377 cm -1 corresponding to stretching and bending vibrations of the hydroxyl groups, respectively and the peaks at around 1050 cm -1 attributed to the pyranose ring ether band of CNC (Mo et al 2009) in ZnO/CNC nanocomposites showed a shift to higher wavenumbers and became wider due to a strong interaction between the oxygen atoms of CNC and ZnO particles. Comparison of these bands for samples 1, 2, and 3 indicates some differences in their shape; this can be explained by the significant differences in the interaction between the two components of the nano-composites.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Azizi¹,

Ahmad²,

Mahdavi³

et al. 2013

BioResources

117

View full text Add to dashboard Cite

Zinc oxide (ZnO) nanoparticles were synthesized within cellulose nanocrystals (CNC) as a new stabilizer by a precipitation method for antimicrobial applications. For fabrication of ZnO/CNC nanocomposites, solutions with different molar ratios of Zn to CNC were prepared in ethanol as the solvent. ZnO/CNC was separated from the suspension and then dried at 120 °C for 1 hour. The nanocomposites were characterized using Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), X-ray diffraction (XRD), transmission electron microscope (TEM), and thermogravimetric (TG) analyses. According to the XRD and TEM results, the ZnO nanoparticles with a hexagonal wurtzite structure were easily prepared and dispersed in the CNC with an average size of less than 20 nm. The average size of the ZnO nanoparticles increased with increasing molar ratio of ZnO to CNC. The best ratio of Zn:CNC was chosen based on the small size of the ZnO nanoparticles that yielded better antimicrobial and thermal properties. The UV-vis absorption spectra of the ZnO/CNC nanocomposites showed absorption peaks in the UV region that were ascribed to the band gap of the ZnO nanoparticles. The antibacterial effects of ZnO/CNC were stronger compared to ZnO nanoparticles.

show abstract

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Azizi¹,

Ahmad²,

Mahdavi³

et al. 2013

BioResources

117

View full text Add to dashboard Cite

show abstract

“…A Figura 5a apresenta as curvas de TG das fibras estudadas enquanto a Figura 5b evidencia através das curvas de DTG, que as fibras submetidas ao tratamento da condição 3 iniciou o processo degradação térmica da estrutura lignocelulósica em menores temperaturas que as fibras in natura e tratadas apenas com H 2 SO 4 , porém em taxa de degradação uma expressivamente menor. Este efeito, possivelmente, deve-se à presença de camadas de polianilina depositadas na superfície das fibras [16] .…”

Section: Caracterizaçãounclassified

Estudo das propriedades mecânicas e elétricas de fibras de curauá modificada com polianilina

Picciani

Rocha

et al. 2010

Polímeros

View full text Add to dashboard Cite

Resumo: Fibras naturais têm sido empregadas em diversos compósitos, principalmente na indústria automobilística. Dentre as diversas fibras naturais, a fibra de curauá é atraente por apresentar elevada propriedade mecânica associada a baixos valores de densidade. Neste trabalho a fibra de curauá é modificada quimicamente pelo recobrimento de uma camada condutora de polianilina, PAni. O material obtido foi caracterizado pelas técnicas espectrometria de infravermelho por transformada de Fourier (FTIR), análise termogravimétrica (TG) e microscopia ótica. As técnicas de caracterização utilizadas demonstraram que a metodologia empregada foi eficiente para formar um recobrimento parcial, porém efetivo, uma vez que o recobrimento permitiu a formação de caminhos condutores ao longo de toda a fibra. As propriedades eletro-mecânicas das fibras também foram avaliadas e os compósitos apresentaram um grande potencial para a construção de sensores de pressão a baixos custos. Palavras-chave: Fibra de curauá, polianilina, condutividade elétrica, degradabilidade. Study on Mechanical and Electrical Properties of Curaua Fibers Modified with PolianilineAbstract: Natural fibers have been employed as reinforcement filler in composite materials for the automobile industry. Among the natural fibers, the curauá fiber is promising due to its high mechanical resistance associated with low density values. In this work curauá fibers are chemically modified by a conducting polyaniline coating, with the aim of using this new conductive composite as pressure sensors. The composite material obtained was characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG) and optical microscopy. The results demonstrated that the methodology adopted was efficient in forming a partial, but effective, coating of the fiber, thus leading to conducting paths along the whole fiber. The electro-mechanical properties of the fibers were also evaluated and the composites have potential for low cost pressure sensors. Furthermore, the modified fibers had good thermal stability and the partial coating allows the composite to be naturally degraded as an environmentally-friendly material. Keywords: Curaua fiber, polyaniline, electrical conductivity, degradability. IntroduçãoO aproveitamento dos recursos naturais é uma opção para alguns setores produtivos devido à possibilidade de substituição, total ou parcial, dos materiais sintéticos por outros ecologicamente amigáveis, também capazes de agregar valor ao produto final. Dentre os materiais que apresentam grande potencial para a aplicação industrial encontram-se as fibras vegetais. Muitas destas fibras já estão presentes na natureza em quantidades apropriadas para serem utilizadas pela indústria, enquanto outras apresentam fácil adaptação de cultivo visando o aumento da produção. O curauá (Ananás erectifo) é uma planta nativa da floresta amazônica e integrante da família do abacaxi [1] , sua fibra é um material atrativo do ponto de vista econômico e tecnológico devido às facilidade...

show abstract

“…Although the FTIR spectrum of the CNF/PANI composite showed the characteristic peaks of both CNF and PANI, there were some notable changes. Distinctly, all the characteristic peaks of the CNF/PANI composite were shifted to lower frequencies compared with those of pristine PANI, which could be due to the cleavage of hydrogen bonds in PANI particles and pure CNF (Mo et al 2009;Kebiche et al 2012;Lissarrague et al 2012). Moreover, the intensity of the OH peak (around 3265 cm -1 ) and NH peak (around 792 cm -1 ) in the CNF/PANI composite was significantly decreased compared with pure CNF and PANI.…”

Section: Ftir Analysismentioning

confidence: 91%

“…Moreover, the diameters of CNF gradually increased with increasing PANI content. This result indicated that CNF fibers were completely enclosed by the PANI coating, which was comprised of small and uniform particles of several tens of nm in diameter (Meng et al 2009;Mo et al 2009). …”

Section: Morphological Characteristicsmentioning

confidence: 91%

Characterization and Properties of Cellulose Nanofiber/ Polyaniline Film Composites Synthesized through in Situ Polymerization

He¹,

Tian²,

Li³

et al. 2016

BioResources

View full text Add to dashboard Cite

Cellulose nanofiber/polyaniline (CNF/PANI) composites films were synthesized through in situ polymerization of aniline in a nanocellulose suspension that was isolated from bamboo (Phyllostachys nidularia Munro). The PANI contents were 5 wt.%, 15 wt.%, or 30 wt.%. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the CNF nanofibril surfaces were uniformly coated by PANI particles. Moreover, Fourier transform infrared (FTIR) spectroscopy analysis indicated the formation of hydrogen bonds between the amine groups of aniline and the hydroxyl groups of cellulose. X-ray diffraction (XRD) analysis demonstrated that the cellulose I structure of CNF in the composites did not change, while the crystallinity of CNF was affected. Thermogravimetric analysis (TGA) showed that the thermal stability of CNF was increased due to the addition of PANI. Meanwhile, the obtained electrical conductivity and mechanical properties of the CNF/PANI composites indicated that the composites could be used potentially in antistatic materials, for shielding of electromagnetic radiation, and in biological sensors.

show abstract

Heterogeneous preparation of cellulose–polyaniline conductive composites with cellulose activated by acids and its electrical properties

Cited by 130 publications

References 28 publications

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Preparation, Characterization, and Antimicrobial Activities of ZnO Nanoparticles/Cellulose Nanocrystal Nanocomposites

Estudo das propriedades mecânicas e elétricas de fibras de curauá modificada com polianilina

Characterization and Properties of Cellulose Nanofiber/ Polyaniline Film Composites Synthesized through in Situ Polymerization

Contact Info

Product

Resources

About