Surface Characterization of Conducting Polymer-Silica Nanocomposites by X-ray Photoelectron Spectroscopy

Maeda, Shuichi; Gill, Michael; Armes, Steven P.; Fletcher, Ian

doi:10.1021/la00006a014

Cited by 102 publications

(79 citation statements)

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“…This is probably due to the presence of specific cationic and carboxylated PPy-silica particles) using a depletion method based on adsorption sites associated with the PPyCl, even though XPS studies suggest UV spectroscopy. DNA adsorbs onto the PPyCl powder, the unfunctionthat this component has a relatively low surface concentration (18). This alized PPy-silica particles and onto both the aminated and carboxylated explanation is consistent with our earlier observation that polypyrrole powPPy-silica particles.…”

Section: Resultssupporting

confidence: 90%

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Saoudi

Jammul

Chehimi

et al. 1997

Journal of Colloid and Interface Science

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Section: Resultssupporting

confidence: 90%

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Saoudi

Jammul

Chehimi

et al. 1997

Journal of Colloid and Interface Science

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“…13,14,16,17 Incorporation of the less-stable PANI moiety in the PN-VC-PANI network would evidently cause a decrease in the stability of the PNVC-PANI-Al 2 O 3 composite and thus the observed trend was reasonable.…”

Section: Thermogravimetric Stability Characteristicsmentioning

confidence: 85%

Water‐dispersible conducting nanocomposites of binary polymer systems. I. Poly(N‐vinylcarbazole)–polyaniline–Al₂O₃ nanocomposite system

Maity

Biswas

2004

J of Applied Polymer Sci

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The chemical oxidative polymerization of a mixture of N‐vinylcarbazole (NVC) and aniline (ANI), by FeCl3 in aqueous medium, produced an insoluble polymer that contained polyaniline (PANI), along with some residual poly‐N‐vinylcarbazole (PNVC) not extractable with benzene. This insoluble PNVC–PANI composite could be obtained as a stable suspension in water when the above polymerization was conducted in the presence of nanodimensional Al2O3. Alternatively, PNVC–(PANI–Al2O3) composite could also be produced by precipitating a THF solution of preformed PNVC onto a PANI–Al2O3 suspension. Likewise PANI–(PNVC–Al2O3) could be obtained by polymerizing ANI onto an aqueous suspension of PNVC–Al2O3. The inclusion of either of these monomer units in the resultant polymer was confirmed by FTIR analysis. SEM analyses revealed formation of a lumpy aggregate, and TEM analyses confirmed particle sizes of the PNVC–PANI–Al2O3 composite to be in the 52–200 nm range. Thermogravimetric stability was in the order: PANI–Al2O3 < PNVC–PANI–Al2O3 < PNVC–Al2O3. The dc conductivity values (S/cm) followed the trend: PNVC–Al2O3 (10−7) < PNVC–PANI–Al2O3 (1.5 × 10−4) ≈ PANI–Al2O3 (1.1 × 10−4) < PNVC–PANI (1 × 10−3) at ambient temperature. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 803–811, 2004

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“…The observed presence of dark globular particles along with the lighter once is reminiscent of the TEM micrograph realized with PPY-metal oxide and PANI-metal oxide nanocomposite systems reported earlier. [28][29][30] Thermal Stability Characteristics Percent weight retained versus temperature studies ( Figure 3) for AB, PAN-AB composite and PAN homopolymer revealed the following trend in the order of thermogravimetric stability: (a) initial decomposition temperature varied as AB > PAN-AB > PAN (b) temperature for 50% decomposition varied as AB > PAN-AB > PAN (c) limiting decomposition temperature varied as AB > PAN-AB > PAN. The intermediate stability of PAN-AB composite could manifest from the incorporation of less stable PAN moieties, in more stable AB in the PAN-AB composite.…”

Section: Transmission Electron Micrographic Characterizationmentioning

confidence: 99%

Preparation and Some Properties of a Nanocomposite of Polyacrylonitrile with Acetylene Black

Maity

Biswas

2004

Polym J

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ABSTRACT:Conducting nanocomposites of polyacrylonitrile (PAN) with acetylene black (AB) were prepared via K 2 CrO 4 -NaAsO 2 initiated redox polymerization of acrylonitrile in presence of AB suspension in aqueous-methanol medium at 60 C. Prolonged extraction of PAN-AB composite by DMF failed to extract the loaded polyacrylonitrile completely from the acetylene black, as confirmed by FT IR studies. SEM analyses revealed the formation of agglomerates of particles of nonuniform sizes and shapes. TEM analysis indicated that average particle diameters of the PAN-AB composite were in the range of 120-250 nm. Thermal stability of the PAN-AB composite was appreciably improved relative to that for the unmodified base polymer. The dc conductivity of the PAN-AB composite was in the range of 10 À4 -10 À2 S/cm depending on the amount of AB in the PAN-AB composite, a value remarkably improved relative to that of the PAN homopolymer (>10 À11 S/cm).

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Surface Characterization of Conducting Polymer-Silica Nanocomposites by X-ray Photoelectron Spectroscopy

Cited by 102 publications

References 1 publication

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Water‐dispersible conducting nanocomposites of binary polymer systems. I. Poly(N‐vinylcarbazole)–polyaniline–Al₂O₃ nanocomposite system

Preparation and Some Properties of a Nanocomposite of Polyacrylonitrile with Acetylene Black

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Surface Characterization of Conducting Polymer-Silica Nanocomposites by X-ray Photoelectron Spectroscopy

Cited by 102 publications

References 1 publication

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Adsorption of DNA onto Polypyrrole–Silica Nanocomposites

Water‐dispersible conducting nanocomposites of binary polymer systems. I. Poly(N‐vinylcarbazole)–polyaniline–Al2O3 nanocomposite system

Preparation and Some Properties of a Nanocomposite of Polyacrylonitrile with Acetylene Black

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Product

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Water‐dispersible conducting nanocomposites of binary polymer systems. I. Poly(N‐vinylcarbazole)–polyaniline–Al₂O₃ nanocomposite system