Spectroscopic detection of carbon nanotube interaction with amphiphilic molecules in epoxy resin composites

Incorporation of carbon nanotubes into epoxy resin composites has the effect of increasing electrical conductivity at low percolation levels. An amphiphilic molecule such as palmitic acid has been used to increase the surface contact area and improve the dispersion of the carbon nanotube bundles in the prepolymer. The chemical environment of the dispersed nanotubes has been probed using vibrational Raman spectroscopy. Spectroscopic Raman maps, on sample surfaces (60x60 µm2) with ratios of nanotubes to palmitic acid varying from 1:2 to 2:1 by weight, have been recorded to test the uniformity of the dispersion. Substantial spatial inhomogeneities have been observed in the G-band shift and an additional spectral band at 1450 cm-1. The 1450 cm-1 band has been attributed to the CH3 group of the amphiphilic molecules adsorbed onto the nanotube surface. The maps are correlated with the measured electrical conductivity values. The highest conductivity has been observed for the best dispersed nanotubes and nanotubes with the highest degree of interaction

Spectroscopic detection of carbon nanotube interaction with amphiphilic molecules in epoxy resin composites

Abstract Incorporation of carbon nanotubes into epoxy resin composites has the effect of increasing electrical conductivity at low percolation levels. An amphiphilic molecule such as palmitic acid has been used to increase the surface contact area and improve the dispersion of the carbon nanotube bundles in the prepolymer. The chemical environment of the dispersed nanotubes has been probed using vibrational Raman spectroscopy. Spectroscopic Raman maps, on sample surfaces (60x60 µm 2 ) with ratios of nanotubes to palmitic acid varying from 1:2 to 2:1 by weight, have been recorded to test the uniformity of the dispersion. Substantial spatial inhomogeneities have been observed in the G-band shift and an additional spectral band at 1450 cm -1 . The 1450 cm -1 band has been attributed to the CH 3 group of the amphiphilic molecules adsorbed onto the nanotube surface. The maps are correlated with the measured electrical conductivity values. The highest conductivity has been observed for the best dispersed nanotubes and nanotubes with the highest degree of interaction

L'inscription araméenne du linteau de Saint-Pierre en Gallicante

International audienc

Un ivoire de Bît-Gust (Arpad) à Nimrud

Puech Emile. Un ivoire de Bît-Gust (Arpad) à Nimrud. In: Syria. Tome 55 fascicule 1-2, 1978. pp. 163-169

'Les oeuvres de la Loi' : mariage et divorce à Qumrân et dans les lettres de Paul

Communication présentée lors du second "International Symposium on Jewish and Christian Literature from the Hellenistic and Roman Period", tenu en 2011 à l'Université de Lorraine (Metz, France

4Q252 : "Commentaire de la Genèse A" ou "Bénédictions patriarcales"

International audienc

Hedwige Rouillard. La péricope de Balaam (Nombres 22-24). La prose et les « Oracles »

Puech Emile. Hedwige Rouillard. La péricope de Balaam (Nombres 22-24). La prose et les « Oracles ». In: Revue de l'histoire des religions, tome 205, n°3, 1988. pp. 299-301

Addendum : 4Q Sam = 1 S 5,8b

dans l'article de A. Ravasco, L'arca dell'Alleanza a Gat (1Sam 5,8) e il racconto di Nahash (1Sam 11,1