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Nanomatériaux
(68) Production(s) de l'année 2018
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« Introduction aux spectroscopies vibrationnelles infrarouge et Raman »
Auteur(s): Bantignies J.-L.
Conférence invité: Rencontre PAC chimie Balard (Montpellier, FR, 2018-09-13)
Résumé: « Introduction aux spectroscopies vibrationnelles infrarouge et Raman »
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Study of the influence of nonlinear parameters on the efficiency of resistive field grading tube for cable termination 
Auteur(s): Boucher Sarah, Chambard R., Hassanzadeh M., Castellon Jérôme, Metz R.
(Article) Publié:
Ieee Transactions On Dielectrics And Electrical Insulation, vol. p.2413 (2018)
Ref HAL: hal-01948521_v1
DOI: 10.1109/TDEI.2018.007329
WoS: 000452434500045
Exporter : BibTex | endNote
2 Citations
Résumé: The aim of this paper is to investigate the influence of nonlinear parameters (threshold field, low field conductivity and nonlinearity coefficient) on the performance of a cable termination equipped with a resistive field grading tube in 50 Hz and impulse voltage. The electrical field distribution over the insulator silicone housing surface was computed and analyzed using a finite element software (Flux 2D). Comparative studies between linear field grading (r = 2.9 and 16) and nonlinear resistive field grading (12 < r < 19) show that better effectiveness is achieved with a low threshold field and a high permittivity under 50 Hz and a high nonlinearity coefficient under impulse voltage.
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Electrolyte transport through single−walled carbon nanotubes
Auteur(s): Henn F., Yazda K., Tahir S., Michel T., Loubet Bastien, Manghi Manoel, Bentin Jeremy, Picaud Fabien, Palmeri J., Jourdain V.
Conference: JOURNÉES DE LA MATIÈRE CONDENSÉE 2018 (JMC2018) (Grenoble, FR, 2018-08-27)
Ref HAL: hal-01947964_v1
Exporter : BibTex | endNote
Résumé: We present experimental and theoretical results on the electrical conductivity and other properties of carbon nanotubes.
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Infrared spectrscopy : theory and applications
Auteur(s): Bantignies J.-L.
Conférence invité: Workshop Franco-Maghrébin sur les Spectroscopies Vibrationnelles IR et Raman (Hammamet, TN, 2018-11-19)
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Endohedral confinement of dies inside carbon nanotubes : key factor for charge transfer modulation
Auteur(s): Bantignies J.-L.
Conférence invité: ILL and ESS European Users Meeting (Grenoble, FR, 2018-10-10)
Ref HAL: hal-01945783_v1
Exporter : BibTex | endNote
Résumé: Encapsulating molecules inside nanotubes (called hybrid nanotubes in the following) is a common strategy to add new functionalities to the nanocontainer. The one-dimensional nature of single-walled carbon nanotubes (SWCNT) internal channels is exploited here to induce a molecular order and specific interactions which are dependent of the size of the nano container (figure 1). I present here the study of the relation between structural, vibrational and electronic properties of hybrid nanotubes encapsulating dyes. Dimethyl-quarterthiophene (4TCH3) encapsulated inside single-walled carbon nanotubes is studied by inelastic neutron scattering. The results reveal specific dynamics of the 4TCH3 modes characterized in particular by a large sensitivity in the low frequency domain of the methyl libration to the confinement. DFT based calculations consistently describe the observed phenomena and give insights on the structure of the hybrid nanotubes at low temperature where molecules preferentially interact with the nanotube wall. We evidence also by means of Raman spectroscopy and transmission electron microscopy that the supramolecular organizations of the confined oligothiophenes depend on the nanocontainer size. Charge transfer between the dyes and the nanocontainer is shown. A strong dependence on the infrared response of the hybrid nanotube due to confinement effect is finally investigated. The results are compared to experiments performed on nanotubes where dyes are π-stacked at the outer surface. Surprisingly, the confinement properties lead to an exaltation of the infrared absorption response in the carbon nanotubes from dye molecule interactions. Thanks to the comparison between the experimental investigations and DFT calculations, we elucidate the origin of the large enhancement of this infrared absorption.
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Polarized Raman, FTIR, and DFT study of Na 2 Ti 3 O 7 microcrystals
Auteur(s): Silva Fábio Lacerda Resende e, Filho Adailton Azevedo Araújo, Silva Mauricélio Bezerra, Balzuweit Karla, Bantignies J.-L., Caetano Ewerton Wagner Santos, Moreira Roberto Luiz, Freire Valder Nogueira, Righi Ariete
(Article) Publié:
Journal Of Raman Spectroscopy, vol. 49 p.538-548 (2018)
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