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Chimie et Matériaux
(10) Production(s) de l'année 2017
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Novel biobased and food contact epoxy coatings for glass toughening applications 
Auteur(s): Ng Feifei, Bonnet L., David G., Caillol Sylvain
(Article) Publié:
Progress In Organic Coatings, vol. 109 p.1-8 (2017)
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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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Impact of solid and liquid balls on a solid surface: an unified description
Auteur(s): Arora S., Fromental J.-M., Mora S., Phou T., Ramos L., Ligoure C.
Conference: APS March meeting 2017 (La Nouvelle-Orléans, US, 2017-03-12)
Ref HAL: hal-01495935_v1
Exporter : BibTex | endNote
Résumé: We study experimentally the impact of ultra soft spherical gel balls of millimetric size d0 on a rigid substrate covered by a thin layer of liquid nitrogen to avoid viscous dissipation. The balls largely deform like a pancake at high impact velocities. We measure the maximally deformed size dmax and the the time needed to reach this maximal size after impact τmax, versus the impact velocity ui for various elastic moduli. We do the same type of experiments with liquid droplets of various surface tensions. The experiments reveal a universal scaling behavior of the maximum deformation dmax/d0 of both solid balls and liquid drops provided that both bulk and surface elasticity are properly taken into account. Moreover, we show that, in absence of viscous dissipation, the dynamics of the system can be understood as a conventional spring-mass system with a stiffness given by a combination of surface tension and bulk elasticity and a mass given by that of the ball (or drop); the deformation of the small ball (drop) during the impact linearly depends on the impact velocity, and the contact time scales as the period of this spring-mass system.
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