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Thomas, Paul; Guerbois, J. P.; Russell, G.; Briscoe, B.J.

doi:10.1023/a:1011578514047

Cited by 185 publications

(86 citation statements)

References 5 publications

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“…According to the curves presented in Fig. 43 The residue observed in an air atmosphere is a consequence of the effects of geometry on the degradation process. In the sample of PVA/TiO 2 rods nanocomposite, only the final degradation step of the PVA matrix, the destruction of the carbonized residue, was shifted toward higher temperature by ≈25 °C compared to that of the neat PVA sample.…”

Section: Thermal Properties Of Pva/tio 2 Nanocompositesmentioning

confidence: 99%

The influence of shaped TiO2 nanofillers on thermal properties of polyvinyl alcohol

Radoičić¹,

Šaponjić²,

Marinovic-Cincovic³

et al. 2012

J Serb Chem Soc

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PVA-based nanocomposites consisting of shaped TiO2 nanocrystals (nanoparticles, nanotubes or nanorods) were synthesized by direct blending of polymer and titania nanocrystals solution or powder. In order to elucidate the influence of shape of titania nanocrystals on thermal stability of polymer matrix and particles interaction with PVA chain, structural and thermal characterizations of PVA/TiO2 nanocomposites were performed. Faceted nanoparticles increased the thermal stability of PVA matrix. Titania nanotubes and nanorods did not show any stabilizing effect on polymer matrix in argon atmosphere. The thermo-oxidative degradation temperature of PVA increased with addition of faceted TiO2 nanoparticles. The thermo-oxidative stability of the PVA matrix was affected more by the presence of titania nanotubes and nanorods in comparison with its thermal stability in inert atmosphere. The crystallinity degree (Xc=32 %) of PVA matrix slightly decreased in the presence of faceted TiO2 nanoparticles in nanocomposite sample

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Section: Thermal Properties Of Pva/tio 2 Nanocompositesmentioning

confidence: 99%

The influence of shaped TiO2 nanofillers on thermal properties of polyvinyl alcohol

Radoičić¹,

Šaponjić²,

Marinovic-Cincovic³

et al. 2012

J Serb Chem Soc

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“…The presence of the peaks at 1715, 1363, and 1248 cm À1 can be attributed to the residual acetate groups in the PVA polymer. 10 The peak in the range of about 2230-2400 is omitted because the technique used is sensitive to carbon dioxide in the atmosphere. 11 The intensity of the broad band peak in the region of 1092 cm À1 increased with the addition of cellulose nanofibers to the PVA matrix because of the contribution of CAO stretching from the cellulosic component.…”

Section: Microscopy and Appearance Of The Nanofiber Compositesmentioning

confidence: 99%

Preparation and characterization of poly(vinyl alcohol) nanocomposites made from cellulose nanofibers

Qua

Hornsby

Sharma

et al. 2009

J of Applied Polymer Sci

164

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A method using a combination of ball milling, acid hydrolysis, and ultrasound was developed to obtain a high yield of cellulose nanofibers from flax fibers and microcrystalline cellulose (MCC). Poly(vinyl alcohol) (PVA) nanocomposites were prepared with these additives by a solution-casting technique. The cellulose nanofibers and nanocomposite films that were produced were characterized with Fourier transform infrared spectrometry, Xray diffraction, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. Nanofibers derived from MCC were on average approximately 8 nm in diameter and 111 nm in length. The diameter of the cellulose nanofibers produced from flax fibers was approximately 9 nm, and the length was 141 nm. A significant enhancement of the thermal and mechanical properties was achieved with a small addition of cellulose nanofibers to the polymer matrix. Interestingly, the flax nanofibers had the same reinforcing effects as MCC nanofibers in the matrix. Dynamic mechanical analysis results indicated that the use of cellulose nanofibers (acid hydrolysis) induced a mechanical percolation phenomenon leading to outstanding and unusual mechanical properties through the formation of a rigid filler network in the PVA matrix. X-ray diffraction showed that there was no significant change in the crystallinity of the PVA matrix with the incorporation of cellulose nanofibers.

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“…It is then difficult to distinguish between particle size effects and the influence of remaining surfactants, especially when different particle size materials are prepared using a variety of stabilizers. 42,43 These mild thermal decomposition conditions were appropriate to decompose the polymer whilst retaining the catalytic activity of the gold surface. Prati et al 38 used poly(vinyl alcohol) (PVA) for this purpose since it decomposes at temperatures above 250 1C in an inert atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of electrocatalytic reduction of oxygen and hydrogen peroxide on dispersed gold nanoparticles

Jirkovský

Halasa

Schiffrin

2010

Phys. Chem. Chem. Phys.

129

131

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The electrocatalytic properties of Au nanoparticles of mean size between 4.2 to 9.5 nm have been investigated for the oxygen reduction reaction (ORR). The particles were prepared on dispersed Vulcan XC-72R carbon black by reduction of a gold salt and by deposition of polymer stabilised gold sols. These were then attached to a glassy carbon disc electrode from their dispersion in a Nafion solution. The dependence on particle size of activity and selectivity for H(2)O(2) formation and the rate constants for oxygen and hydrogen peroxide reduction have been investigated using Rotating (Ring) Disc Electrode measurements. The electrocatalytic activity showed a maximum for a mean particle size of 5.7 nm and decreased significantly with particle size. The number of electrons exchanged per O(2) molecule increased from a value close to 2 to 3.4 as the potential was made more negative. The oxygen reduction selectivity for H(2)O(2) production was higher for mean particle sizes below 6 nm.

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Untitled

Cited by 185 publications

References 5 publications

The influence of shaped TiO2 nanofillers on thermal properties of polyvinyl alcohol

The influence of shaped TiO2 nanofillers on thermal properties of polyvinyl alcohol

Preparation and characterization of poly(vinyl alcohol) nanocomposites made from cellulose nanofibers

Kinetics of electrocatalytic reduction of oxygen and hydrogen peroxide on dispersed gold nanoparticles

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