Water-Soluble Self-Acid-Doped Conducting Polyaniline: Structure and Properties

Chen, Show‐An; Hwang, Gue-Wuu

doi:10.1021/ja00145a017

Cited by 253 publications

(174 citation statements)

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“…The aniline:DBSA molar ratio into the reactor was 1:1, and as it is very well known that the doping degree of PANI is approximately 33% [15,35,36]; at the end of the polymerization process there is an excess of DBSA in the reactor. Therefore the formation of micellar structures could take place and this fact leads to the formation of nano or microstructures.…”

Section: Aqueous Dispersionsmentioning

confidence: 99%

“…Therefore, much effort has been dedicated to obtaining water-soluble ICPs. In the case of PANI, different approaches were used such as the incorporation of hydrophilic units to aromatic rings or on the nitrogen sites [12][13][14][15][16][17]. Also, other strategies, for example, the formation of PANI-blends with water-soluble polymeric acids [18], doping PANI with protonic acids carrying long hydrophilic tail [19], controlling the pH of the solution [20], by using β-cyclodextrin [21] or modifying polyaniline with orthosilicates [22] were also used.…”

Section: Introductionmentioning

confidence: 99%

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Poly(aniline)/poly(methylmethacrylate) films obtained from waterborne latex nanoparticles

et al. 2008

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This paper presents the characterization of poly(aniline) (PANI) and poly(methyl methacrylate) (PMMA) coatings obtained by mixing PANI with PMMA aqueous dispersions (latex particles). These dispersions were characterized by using dynamic light scattering for sizing, zeta-potential analysis and thermal analysis. PMMA and PANI/PMMA dispersions show negative charged particles with zeta potential greater than |40| mV, a zeta-average diameter of 64 nm for pure PMMA and a bi-modal particle-size distribution centered at 45 and 120 nm for a mixture with 25% w/w of PANI. Films obtained by casting were characterized by using scanning electron microscopy and they show a conductivity increase upon PANI content reaching a value of 1 mS cm -1 for a film with 25% w/w of PANI. In addition, Raman spectroscopy have shown the presence of the conducting form of PANI in the films and cyclic voltammetry experiments corroborated that they are electroactive in both acid and neutral solutions.

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Section: Aqueous Dispersionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Poly(aniline)/poly(methylmethacrylate) films obtained from waterborne latex nanoparticles

et al. 2008

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“…36,37 These characteristics were confirmed by the electron spin resonance signal, which demonstrated a high concentration of polaron by the protonation on the main chain of SPAnH. 35 The resulting dispersion likely provided a large surface area, thereby increasing the opportunities for rtPA conjugation.…”

Section: Discussionmentioning

confidence: 91%

“…The electron spin resonance signal ( Figure 1E) demonstrated that the peak-to-peak line width (∆Hpp) was 2.49 G, the spin density was 3.04 × 10 20 spin/g, and the g value was 2.0037, which confirmed the resonance of free electrons delocalized in the π-system of the carbon atoms forming the SPAnH backbone in the main chain. 35 The results indicate that many electron-hole pairs were produced on the main chain of SPAnH, thereby providing positively charged carriers.…”

Section: Characterization Of Mncsmentioning

confidence: 95%

Bioconjugation of recombinant tissue plasminogen activator to magnetic nanocarriers for targeted thrombolysis

Ma¹,

Yang²,

Hua³

et al. 2012

IJN

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Low-toxicity magnetic nanocarriers (MNCs) composed of a shell of poly [aniline-co-N-(1-one-butyric acid) aniline] over a Fe 3 O 4 magnetic nanoparticle core were developed to carry recombinant tissue plasminogen activator (rtPA) in MNC-rtPA for targeted thrombolysis.With an average diameter of 14.8 nm, the MNCs exerted superparamagnetic properties. Up to 276 µg of active rtPA was immobilized per mg of MNCs, and the stability of the immobilized rtPA was greatly improved during storage at 4°C and 25°C. In vitro thrombolysis testing with a tubing system demonstrated that magnet-guided MNC-rtPA showed significantly improved thrombolysis compared with free rtPA and reduced the clot lysis time from 39.2 ± 3.2 minutes to 10.8 ± 4.2 minutes. In addition, magnet-guided MNC-rtPA at 20% of the regular rtPA dose restored blood flow within 15-25 minutes of treatment in a rat embolism model without triggering hematological toxicity. In conclusion, this improved system is based on magnetic targeting accelerated thrombolysis and is potentially amenable to therapeutic applications in thromboembolic diseases.

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“…Têm sido obtidos vários derivados da polianilina, manufaturados através da substituição no monômero original, produzindo novos materiais ativos com propriedades físicas distintas da polianilina [102][103][104][105] . Um dos tipos mais interessantes de derivados são as chamadas polianilinas auto-dopadas; tais polímeros contêm grupos funcionais aniogênicos, aptos a interagir com átomos de nitrogênio positivamente carregados presentes na cadeia de polianilina, causando novos efeitos, diferentes daqueles apresentados por polímeros dopados com ânions em solução 106 .…”

Section: Figura 1 Variação Do Potencial Em Função Da Intercalação Deunclassified

Materiais para cátodos de baterias secundárias de lítio

Varela¹,

Huguenin²,

Malta³

et al. 2002

Quím. Nova

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Recebido em 21/12/00; aceito em 4/7/01 MATERIALS FOR CATHODES OF SECONDARY LITHIUM BATTERIES. In this work, cathodes employed in secondary lithium batteries are reviewed. These cathodes have great technologic and scientific importance, specifically, materials for cathodes as electronic conductor polymers (ECP), transition metal oxides (TMO) and nanocomposites of ECP/TMO. The use of a specific cathodic material is based in some intrinsic characteristics that improve the performance of the battery. Thus, some vantages and disvantages of these insertion compounds are discussed, as lithium insertion capacity, energy density, and the ciclability of these materials.Keywords: secondary lithium batteries; cathodic materials; transition metal oxides; electronic conducting polymers; nanocomposites. INTRODUÇÃOUma fonte eletroquímica de potência ou bateria pode ser definida como um dispositivo capaz de converter diretamente a energia liberada numa reação química em energia elétrica. As baterias apresentam basicamente duas funções principais, a primeira é agir como fontes portáteis de potência elétrica. A segunda, que tem crescido em importância nos últimos trinta anos, está baseada na habilidade de certos sistemas eletroquímicos de armazenar a energia suprida por uma fonte externa. Tais baterias são utilizadas, em veículos elé-tricos, fontes de emergência, como parte de um sistema de fornecimento de curta duração para demandas em pico e em conjunção com fontes renováveis de energia, como solar ou eólica, por exemplo.A primeira descrição de uma bateria eletroquímica foi feita pelo italiano Alessandro Volta em 1800. Tal "descoberta" representa o marco na história da eletroquímica e, particularmente, na história dos dispositivos denominados genericamente baterias. Desde então, um notável progresso tem sido feito na área de armazenamento eletroquímico de energia. Hoje, pode-se enumerar uma grande variedade de dispositivos englobados na categoria de baterias: células metal-ar, metal-hidreto metálico (Ni-HM), níquel-cádmio (Ni-Cd), células térmicas, íons-Lítio, entre outras.O mercado para dispositivos primários consiste basicamente na produção de baterias para aparelhos portáteis. As baterias secundá-rias ou recarregáveis representam maior interesse devido à grande demanda atual de aparelhos celulares e microcomputadores portá-teis. Em 1997, por exemplo, dos 34 bilhões de dólares movimentados com baterias, 24 foram destinados às baterias secundárias 1 .Graças à simplicidade e reversibilidade das reações eletroquímicas de inserção ou intercalação, a grande maioria dos dispositivos secundários que operam à temperatura ambiente é baseada nos chamados eletrodos de inserção. Como exemplos, têm-se os dispositivos secundários aquosos, como hidreto metálico/NiOOH ou Zn/MnO 2 , que envolvem a inserção de H + no hidreto metálico 2,3 ou MnO 2 4,5. Até mesmo o mecanismo de redução do eletrodo positivo das baterias de chumbo ácido, PbO 2 6,7 pode ser atribuído ao processo de inserção de H + 8 .Considerando-se a utilização de cátions metálicos...

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Water-Soluble Self-Acid-Doped Conducting Polyaniline: Structure and Properties

Cited by 253 publications

References 0 publications

Poly(aniline)/poly(methylmethacrylate) films obtained from waterborne latex nanoparticles

Poly(aniline)/poly(methylmethacrylate) films obtained from waterborne latex nanoparticles

Bioconjugation of recombinant tissue plasminogen activator to magnetic nanocarriers for targeted thrombolysis

Materiais para cátodos de baterias secundárias de lítio

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