Surface and thermodynamic characterization of conducting polymers by inverse gas chromatography

AlGhamdi, Ali Saad Thafeed; Al‐Saigh, Zeki Y.

doi:10.1016/s0021-9673(02)00887-7

Cited by 45 publications

(18 citation statements)

References 27 publications

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“…In the absence of ethanol, the newborn state of PANI tended to aggregate together and formed the larger clubshaped structure during the polymerization. When the appropriate proportion of ethanol was added to the solution, there may be existed strong intermolecular H-bonding between the PANI and ethanol molecules, and such interaction made the PANI particles be wrapped by ethanol molecules, 21 which prevented PANI from aggregating together during the polymerization and tended to form the thread-shaped struc- ture, with a relative smaller size. However, with further increase of ethanol content, the aggregation of PANI encapsulated by ethanol molecules probably occurred, which is similar to the aggregation of micelles, and the PANI size also increased.…”

Section: Resultsmentioning

confidence: 99%

Effect of ethanol on chemically synthesized polyaniline nanothread

Kan

Zhang

Jing

2005

J of Applied Polymer Sci

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ABSTRACT:The nanothread of polyaniline (PANI) using ammonium persulphate ((NH 4 ) 2 S 2 O 8 ) as an oxidant was prepared. The solution is composed of 0.4 mol dm Ϫ3 aniline, 1.0 mol dm Ϫ3 hydrochloric acid, and different proportions ethanol. The resulting products were characterized using infrared spectroscopy, UV-vis spectra, transmission electron microscope, thermogravimetric analysis techniques, and Xray diffraction. The experimental results show that the content of ethanol has effects on the morphology of PANI, but the effects on the conductivity are not very obvious. When the volume ratio of ethanol to aniline is 1:2, the more uniform and regular PANI nanothread can be prepared.

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Section: Resultsmentioning

confidence: 99%

Effect of ethanol on chemically synthesized polyaniline nanothread

Kan

Zhang

Jing

2005

J of Applied Polymer Sci

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“…This is a good technique to determine the surface Lewis acid-base properties of insulating thermoplastic and thermosetting polymer materials [13] or to analyze the surface of multipurpose cellulosic office paper [14]. Many other studies were devoted to the conducting polymers by Al-Saigh et al [15,16], Boukerma et al [17] and Bailey et al [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

2011

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Inverse gas chromatography (IGC) at infinite dilution is a powerful technique to characterize the superficial and interfacial properties of solid substrates as oxides, polymers or polymers adsorbed on oxides. It can also be used to determine the physicochemical properties and the transition phenomena of polymers. In this paper, IGC was used to determine the changes, as a function of temperature, of the specific free enthalpy DG a SP and deduce the specific entropy DS a SP of poly (methyl methacrylate) (PMMA) adsorbed on alumina or on silica for different tacticities of PMMA. The study of the surface properties of PMMA/SiO 2 and PMMA/Al 2 O 3 , revealed an important difference in the physicochemical behaviour of oxides covered by various concentrations of PMMA. This study also highlighted an important effect of the tacticity of the polymer on the specific entropy of PMMA adsorbed on oxides.

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“…It exhibits unusual chemical, electrical and optical phenomenon, both in insulating and conducting forms, which offers PAni the potential for use in diverse applications such as, in energy storage, electronics, photovoltaic devices, displays, and sensors. In fact, this promising material has drawn considerable interests since more than a century back (Ghamdi and Saigh, 2002).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyaniline-silica composite material

Akhter

Miran

Susan

et al. 2012

Bangladesh J. Sci. Ind. Res.

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Polyaniline-silica (PAni-silica) composite material with 40% silica was prepared by polymerization of aniline in a medium consisting of colloidal silica, freshly prepared by hydrolysis of sodium silicate at room temperature at pH 6.5. The physico-chemical properties of both PAni and the composite material, PAni-silica were studied by FT-IR and transmission electron microscopy and measurements of BrunauerEmmett-Teller (BET) isotherms. PAni-silica composites showed inhomogeneous pore distribution, although PAni has no significant pores.Average pore size of PAni-silica was 280 and 175 Å during adsorption and desorption of nitrogen, respectively. The interactions of PAnisilica composite and PAni with saturated hydrocarbons were investigated by inverse gas chromatography. The composite material was found to be efficient for separation of a mixture of hydrocarbons, in the range of C 5 -C 9 , owing to large BET surface area. Enthalpy of adsorption of the individual hydrocarbons was evaluated from an analysis of the retention time and the flow rate of the carrier gas. For PAni, the enthalpy of adsorption was very low; however, the value for the composite material was found to be comparable to the enthalpy of evaporation of the individual hydrocarbons.

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Surface and thermodynamic characterization of conducting polymers by inverse gas chromatography

Cited by 45 publications

References 27 publications

Effect of ethanol on chemically synthesized polyaniline nanothread

Effect of ethanol on chemically synthesized polyaniline nanothread

Effect of the Tacticity of PMMA Adsorbed on Alumina and Silica on the Specific Entropy Change of Polymer by Inverse GC

Preparation and characterization of polyaniline-silica composite material

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