Electrochemical Study Of Polyaniline In Aqueous And Organic Medium. Redox And Kinetic Properties.

Geniès, E.M.; Syed, Akheel Ahmed; Tsintavis, C.

doi:10.1080/00268948508074858

Cited by 260 publications

(50 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Considerable effort has been devoted to development of relationships between synthesis conditions and subsequent properties and the molecular weight of PANIs obtained by electrochemical polymerization [23,24]. However, the chemical polymerization process is of particular importance since this synthesis is the most feasible route for the production of PANI on a large scale [25].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

2012

View full text Add to dashboard Cite

This study was to synthesize the inherently conductive polymer polyaniline using an optimized process to prepare polyaniline/silicon dioxide (PANI/SiO 2 ) composites by in situ polymerization and ex situ solution mixing. PANI and PANI/SiO 2 composite films were prepared by drop-by-drop and spin-coating methods. The morphology of particles and films were examined by a scanning electron microscope (SEM). SEM measurements indicated that the SiO 2 were well-dispersed and isolated in composite films. The electrorheological (ER), characteristics of the PANI/SiO 2 composites were investigated. A volume fraction series (u = 5-25 %) of the PANI/SiO 2 / silicone oil dispersions were prepared and sedimentation stabilities were determined. An ER activity was observed from the samples, when subjected to external electric field strength thus, they were classified as smart materials. Some parameters affecting the ER properties of the dispersions such as volume fraction, shear rate, electric field strength, frequency, and temperature were investigated.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

2012

View full text Add to dashboard Cite

show abstract

“…The term kAT corresponds to heat loss. After stopping electrolysis, since dQ equals zero, the following relation exists Cs ~ = -khT [3] Supposing that To is constant and T equals To before electrolysis, the integration of Eq. 2 and 3 gives Eq.…”

Section: Treatment Of the Heat Due To Electrolysismentioning

confidence: 99%

Electrochemical and Thermal Behavior of Polyaniline in Aqueous Solution Containing SO 4 2 − Ions

Maeda

Katsuta

Nagasaki

et al. 1995

J. Electrochem. Soc.

View full text Add to dashboard Cite

Electrochemical and thermal measurements were carried out simultaneously on polyaniline in 1M ZnSO4 aqueous solution. An exothermic change at lower potential and an endothermic change at higher potential were observed on the surface of the polyaniline electrode during the anodic oxidation. The proportional relation between I hTdt and electric quantity was recognized in the thermal response to anodic constant current. The thermal response obtained here may be mainly attributed to the entropy change for two electrochemical processes of doping of SO~-ions and proton elimination. Temperature-dependence of electrode potential of the po]yaniline oxidized anodically in ZnSO4 aqueous solution was examined to evaluate the entropy change for electrochemical dedoping process of SO~ ions.Conducting polymers have attracted workers' attention as functional materials. In order to use conducting polymers effectively, it is important to make clear doping process which may cause their function. The electrochemical method is useful in synthesis of polymers and analysis of the doping process and also for their application. There have been various papers concerning electrochemical behavior of polyaniline. 1-16 It has been proposed that not only anion doping but also proton elimination may proceed in the anodic oxidation of polyaniline in aqueous solutions. In situ measurements of absorption spectra 7-9'1t-I~ and weight change 5' 14-16 of polyaniline during anodic oxidation have been carried out to get knowledge of the electrochemical doping process. We have reported preliminary results of the thermal behavior of polyaniline in the anodic process. ~7' 18 Thermal methods can provide information on the entropy change for an electrochemical reaction. In this paper, we investigated the electrochemical process of polyaniline in aqueous solution containing SO~ ions mainly from the point of view of entropy change through the analysis of electrochemical and thermal response of polyaniline. ExperimentalPolyaniline was anodically polymerized on a graphite electrode (Toyo Tanso Company, size: 10 × 20 × 0.6 mm 3) by a potential sweep method [potential range: 0.0 -0.8 V vs. saturated calomel electrode (SCE); sweep rate: 10 mV s 1; sweep repetition times: 57] in 1M (M = tool dm -3) I-I2SO4 aqueous solution containing 0.1M aniline. To measure the weight of polyaniline polymerized, the potential of the polyaniline-graphite electrode was kept at -0.20 V for 30 min after polymerization, and then it was rinsed with pure water and dried in vacuum. The weight of polyaniline was 6.5 mg by subtracting the weight of graphite. The polyaniline thus prepared was used as a working electrode. As counter and reference electrodes a platinum wire and an SCE, respectively, were used. Thermal measurement was done as follows. One of two thermistors (Takara Thermistor, Model PXK-76; resistance: 7.326 and 7.328 k12 at 20°C; thermistor constants: 3348 and 3337 K, respectively) was attached to the surface of the polyaniline electrode and the other positioned in the bulk of...

show abstract

“…A strategy of affording to dissolve conducting polymers is to introduce a functional group with solvent affinity to a monomer or a polymer backbone. The introduction of long alkane chains to a thiophene ring makes it possible to dissolve the polythiophene in organic solvents [7,8].…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Effects of Si⁵⁺Ion Irradiation on Poly(3-methyl thiophene) Films

Lakshmi

Siddiqui

Zulfequar

2010

International Journal of Polymeric Materials

View full text Add to dashboard Cite

Poly(3-methyl thiophene) has been synthesized by the chemical oxidation polymerization method using FeCl 3 . The powder has been dissolved in CHCl 3 and thin films of thickness 2 mm are prepared on glass and Si substrates. The polymerization has been confirmed by FTIR spectrum. The films are irradiated by 60 MeV Si 5þ ions at different fluences and modifications in optical, electrical and structural properties are studied. FTIR spectra show methyl group evolution after irradiation. The optical band gap decreases after irradiation and dc conductivity increases four orders of magnitude after irradiation at the highest fluence. The conduction mechanism has been found mainly by band conduction.

show abstract

Electrochemical Study Of Polyaniline In Aqueous And Organic Medium. Redox And Kinetic Properties.

Cited by 260 publications

References 5 publications

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

Electrochemical and Thermal Behavior of Polyaniline in Aqueous Solution Containing SO 4 2 − Ions

Effects of Si⁵⁺Ion Irradiation on Poly(3-methyl thiophene) Films

Contact Info

Product

Resources

About

Electrochemical Study Of Polyaniline In Aqueous And Organic Medium. Redox And Kinetic Properties.

Cited by 260 publications

References 5 publications

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

Synthesis and electrorheological properties of polyaniline/silicon dioxide composites

Electrochemical and Thermal Behavior of Polyaniline in Aqueous Solution Containing SO 4 2 − Ions

Effects of Si5+Ion Irradiation on Poly(3-methyl thiophene) Films

Contact Info

Product

Resources

About

Effects of Si⁵⁺Ion Irradiation on Poly(3-methyl thiophene) Films