A Physicochemical Study of Polypyrrole–Silica Nanocomposites by Inverse Gas Chromatography

Perruchot, Christian; Chehimi, Mohamed M.; Delamar, Michel; Lascelles, Stuart F.; Armes, Steven P.

doi:10.1006/jcis.1997.5049

Cited by 34 publications

(9 citation statements)

References 38 publications

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“…Structural changes in nanoparticles after each synthesis step were clearly evident in the BJH curves. During the self-assembly reactions of PPy and SiO 2 nanoparticles, cavities were created within the PPy-SiO 2 nanoparticles, resulting in the 7.3 nm pores, in accordance with the pore sizes of conducting polymer–SiO 2 nanoparticles reported in previous studies. , …”

Section: Resultssupporting

confidence: 88%

“…During the self-assembly reactions of PPy and SiO 2 nanoparticles, cavities were created within the PPy-SiO 2 nanoparticles, resulting in the 7.3 nm pores, in accordance with the pore sizes of conducting polymer−SiO 2 nanoparticles reported in previous studies. 45,53 For the PPy-SiO 2 /TiO 2 nanoparticles, TiO 2 shells were coated as porous layers with pore sizes of ca. 2.1 nm via the sol−gel method.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Synthesis and Electroresponse Activity of Porous Polypyrrole/Silica–Titania Core/Shell Nanoparticles

et al. 2018

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Inverted conducting polymer/metal oxide core/shell structured pPPy/SiO 2 -TiO 2 nanoparticles were prepared as electrorheological (ER) materials using sequential experimental methods. The core was synthesized via the lowtemperature self-assembly of PPy and SiO 2 materials, and the outer TiO 2 shell was easily coated onto the core part using a sol−gel method and a titanium isopropoxide precursor. Sonication-mediated etching and redeposition were employed to etch out SiO 2 portions from the core part to blend with TiO 2 shells. Each step in nanoparticle synthesis involved morphological and physical changes to the surface area and porosity, with subsequent changes in the intrinsic properties of the materials. Specifically, the electrical conductivity and dielectric properties were successfully altered. The final pPPy/ SiO 2 -TiO 2 nanoparticle configuration was optimized for ER applications, offering low electrical conductivity, high dielectric properties, and increased dispersion stability. pPPy/SiO 2 -TiO 2 nanoparticles exhibited 24.7-and 2.7-fold enhancements in ER performance compared to that of PPy-SiO 2 and PPy-SiO 2 /TiO 2 precursor nanoparticles, respectively. The versatile method proposed in this study for the synthesis of inverted conducting polymer/metal oxide core/shell nanoparticles shows great potential for the development of custom-designed ER materials.

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Section: Resultssupporting

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 99%

Synthesis and Electroresponse Activity of Porous Polypyrrole/Silica–Titania Core/Shell Nanoparticles

et al. 2018

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“…Studies of surface energy related phenomena in conjugated polymer porous materials for separation − are available but rarely with the advantage of in situ electrochemical control. Pioneering studies of surface energy changes of polypyrrole films and graphite fibers, − during electrochemical doping and dedoping, were reported.…”

Section: Introductionmentioning

confidence: 99%

In Situ Wilhelmy Balance Surface Energy Determination of Poly(3-hexylthiophene) and Poly(3,4-ethylenedioxythiophene) during Electrochemical Doping−Dedoping

2006

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Changes in the contact angle between conjugated polymers surface poly(3-hexylthiophene) [P3HT] and poly(3,4-ethylenedioxythiophene) (PEDOT) upon electrochemical doping-dedoping in aqueous electrolyte were determined in situ using a Wilhelmy plate tensiometer in an electrochemical cell. The hydrophobic P3HT was less hydrophobic in the oxidized state than in the neutral state; the more hydrophilic PEDOT was less hydrophilic in the oxidized state than when neutral. The tensiometry results were in good agreement with those measured by contact angle goniometry, and further corroborated by the capillary rise upon doping in a fluid cell with two parallel polymer coated plates, another in situ dynamic determination method. The contact angle changes depend on doping potential, electrolyte type, and concentration. We also deconvoluted the surface energy into components of van der Waals and acid-base interactions, using three probe liquids on the polymer surfaces, ex situ the electrochemical cell. The methods and the obtained results are relevant for the science and technology areas of printed electronics and electrochemical devices and for the understanding of surface energy modification by electrochemical doping.

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“…Inverse gas chromatography (IGC) has been used for investigation of the interactions of polymers with various liquids [3,4], hyperbranched aliphatic polyesters [5], block copolymers [6], polymer blends [7], nanocomposites [8], cement pastes [9], crude oils [10], surface properties of Schiff base [11], and liquid crystals [12,13]. The method being simple, relatively rapid, with good accuracy, and of low cost and available equipment provide valuable thermodynamic information for physicochemical characterization of materials [14].…”

Section: Introductionmentioning

confidence: 99%

Dispersive Surface Energy and Acid-Base Parameters of Tosylate Functionalized Poly(ethylene glycol) via Inverse Gas Chromatography

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et al. 2014

Journal of Chemistry

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An inverse gas chromatographic (IGC) study of the sorption properties of poly(ethylene glycol) modified with tosylate (PEG-TOS) was presented. PEG-TOS was synthesized via the tosylation of the corresponding poly(ethylene glycol) (PEG) withp-toluenesulfonyl chloride in the basic medium. The synthesized PEG-Tos was characterized by FTIR-ATR and1HNMR techniques. The retention diagrams of n-hexane, n-heptane, n-octane, n-nonane, n-decane, dichloromethane, chloroform, acetone, tetrahydrofuran, ethyl acetate, and ethanol on the PEG and PEG-Tos were plotted at temperatures in K between 303 and 373 by inverse gas chromatography technique. The dispersive component of the surface-free energy,γSD, of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. Thermodynamic parameters of adsorption (free energy,ΔGAS, enthalpy,ΔHAS, and entropy,ΔSAS), dispersive components of the surface energies,γSD, and the acid,KA, and base,KD, constants for the PEG and PEG-Tos were calculated and the results were discussed.

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A Physicochemical Study of Polypyrrole–Silica Nanocomposites by Inverse Gas Chromatography

Cited by 34 publications

References 38 publications

Synthesis and Electroresponse Activity of Porous Polypyrrole/Silica–Titania Core/Shell Nanoparticles

Synthesis and Electroresponse Activity of Porous Polypyrrole/Silica–Titania Core/Shell Nanoparticles

In Situ Wilhelmy Balance Surface Energy Determination of Poly(3-hexylthiophene) and Poly(3,4-ethylenedioxythiophene) during Electrochemical Doping−Dedoping

Dispersive Surface Energy and Acid-Base Parameters of Tosylate Functionalized Poly(ethylene glycol) via Inverse Gas Chromatography

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