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(37) Production(s) de TAHIR S.
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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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Transport of ions in solution through single-walled carbon nanotubes
Auteur(s): Yazda K., Tahir S., Michel T., Loubet Bastien, Manghi Manoel, Bentin Jérémy, Picaud Fabien, Palmeri J., Henn F., Jourdain V.
Conference: Chemontubes 2018 (Biarritz, FR, 2018-04-22)
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Voltage-activated ionic transport through single-walled carbon nanotubes
Auteur(s): Yazda K., Tahir S., Michel T., Loubet Bastien, Manghi Manoel, Bentin Jérémy, Picaud Fabien, Palmeri J., Henn F., Jourdain V.
Conference: NT17 (Belo Horizonte, BR, 2017-07-10)
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Voltage-activated transport of ions through single-walled carbon nanotubes
Auteur(s): Yazda K., Tahir S., Michel T., Loubet Bastien, Manghi Manoel, Bentin Jeremy, Picaud Fabien, Palmeri J., Henn F., Jourdain V.
(Article) Publié:
Nanoscale, vol. 9 p.11976-11986 (2017)
Ref HAL: hal-01586169_v1
DOI: 10.1039/c7nr02976d
WoS: WOS:000408435400019
Exporter : BibTex | endNote
13 Citations
Résumé: Ionic transport through single-walled carbon nanotubes (SWCNTs) is promising for many applications but remains both experimentally challenging and highly debated. Here we report ionic current measurements through microfluidic devices containing one or several SWCNTs of diameter of 1.2 to 2 nm unexpectedly showing a linear or a voltage-activated I-V dependence. Transition from an activated to a linear behavior, and stochastic fluctuations between different current levels were notably observed. For linear devices, the high conductance confirmed with different chloride salts indicates that the nanotube/water interface exhibits both a high surface charge density and flow slippage, in agreement with previous reports. In addition, the sublinear dependence of the conductance on the salt concentration points toward a charge-regulation mechanism. Theoretical modelling and computer simulations show that the voltage-activated behavior can be accounted for by the presence of local energy barriers along or at the ends of the nanotube. Raman spectroscopy reveals strain fluctuations along the tubes induced by the polymer matrix but displays insufficient doping or variations of doping to account for the apparent surface charge density and energy barriers revealed by ion transport measurements. Finally, experimental evidence points toward environment-sensitive chemical moieties at the nanotube mouths as being responsible for the energy barriers causing the activated transport of ions through SWCNTs within this diameter range.
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Recycling zinc oxide varistor blocks for electro-active silicone composites
Auteur(s): Metz R., Boudehen Loic, Tahir S., Phou T., Prevot G., Jelinek R., Dieudonne-George P., Hassanzadeh Merdad
(Article) Publié:
International Journal Of Applied Ceramic Technology, vol. 14 p.274-281 (2017)
Ref HAL: hal-01517065_v1
DOI: 10.1111/ijac.12637
WoS: WOS:000397509500020
Exporter : BibTex | endNote
1 Citation
Résumé: The recycling process toward the elimination of varistor wastes into new electro-active silicon composites has been investigated. We studied the dependence of the E-J characteristics on the aggregate content in the polymer matrix. Formulations with 40 vol.% metal oxide varistor aggregates in the 100-200m range exhibit reliable nonlinear behavior with a switching voltage of 280 +/- 30V/mm. The breakdown voltage of the composite decreases as both filler's diameter and filler's volume fraction increases in the 550-220V/mm and 440-280V/mm range, respectively. This paves the way for the valorization of varistors based zinc oxide (ZnO) ceramics.
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Morphology and anisotropy of thin conductive inkjet printed lines of single-walled carbon nanotubes
Auteur(s): Torres-Canas F. J., Blanc C., Mašlík Jan, Tahir S., Izard N., Karasahin Senguel, Castellani Mauro, Dammasch Matthias, Zamora-Ledezma C., Anglaret E.
(Article) Publié:
Materials Research Express, vol. 4 p.035037 (2017)
Ref HAL: hal-01504984_v1
DOI: 10.1088/2053-1591/aa5687
WoS: 000398803200003
Exporter : BibTex | endNote
2 Citations
Résumé: We show that the properties of thin conductive inkjet printed lines of single-walled carbon nanotubes (SWCNT) can be greatly tuned, using only a few deposition parameters. The morphology, anisotropy and electrical resistivity of single-stroke printed lines are studied as a function of ink concentration and drop density. An original method based on coupled profilometry-Raman measurements is developed to determine the height, mass, orientational order and density profiles of SWCNT across the printed lines with a micrometric lateral resolution. Height profiles can be tuned from 'rail tracks' (twin parallel lines) to layers of homogeneous thickness by controlling nanotube concentration and drop density. In all samples, the nanotubes are strongly oriented parallel to the line axis at the edges of the lines, and the orientational order decreases continuously towards the center of the lines. The resistivity of 'rail tracks' is significantly larger than that of homogeneous deposits, likely because of large amounts of electrical dead-ends.
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Transport of ions and molecules inside carbon nanotubes : towards the detection of individual biomolecule
Auteur(s): Yazda K., Tahir S., Michel T., Thibaud Jean-Baptiste, Loubet Bastien, Manghi Manoel, Palmeri J., Henn F., Jourdain V.
(Affiches/Poster)
5ème Journées Scientifiques du LabEx NUMEV (Montpellier, FR), 2016-10-05
Ref HAL: hal-01950212_v1
Exporter : BibTex | endNote
Résumé: We present experimental and theoretical results for the transport of ions and molecules inside carbon nanotubes.
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