Materials Literature
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Doping of low-dimensional graphitic materials, including graphene, graphene quantum dots and single-wall carbon nanotubes with nitrogen, sulfur or boron can significantly change their properties. We report that simple fluorination followed by annealing in a dopant source can superdope low-dimensional graphitic materia…
Biochar is increasingly gaining attention due to multifunctional roles in soil amelioration, pollution mitigation and carbon sequestration. It is a significant challenge to compare the reported results from world-wide labs regarding the structure and sorption of biochars derived from various precursors under different…
Water in confined geometries has obvious relevance in biology, geology, and other areas where the material properties are strongly dependent on the amount and behavior of water in these types of materials. Another reason to restrict the size of water domains by different types of geometrical confinements has been the…
Sodium storage capacity, mobility, and volume change during sodiation on the surfaces of interlayer-expanded Ti 3 C 2 MXenes are investigated using ab initio density functional theory. The theoretical results reveal that the interlayer-expanded bare, F-, O-, and OH-functionalized Ti 3 C 2 MXenes exhibit low barriers f…
An important property with any new material is the band gap. Standard density functional theory methods grossly underestimate band gaps. This is known as the band gap problem. Here, we show that the hybrid B3PW91 density functional returns band gaps with a mean absolute deviation (MAD) from experiment of 0.22 eV over…
Metasurfaces, two‐dimensional versions of metamaterials, retain the great capabilities of three‐dimensional counterparts in manipulating electromagnetic wave behaviors, while reducing the challenges in fabrication. By judiciously engineering parameters of individual building blocks (such as geometry, size, and materia…
Optically transparent wood (TW) with transmittance as high as 85% and haze of 71% was obtained using a delignified nanoporous wood template. The template was prepared by removing the light-absorbing lignin component, creating nanoporosity in the wood cell wall. Transparent wood was prepared by successful impregnation…
Two-dimensional (2D) materials present their excellent properties in electronic and optoelectronic applications, including in ultrafast carrier dynamics, layer-dependent energy bandgap, tunable optical properties, low power dissipation, high mobility, transparency, flexibility, and the ability to confine electromagnet…
Ice accretion has a negative impact on critical infrastructure, as well as a range of commercial and residential activities. Icephobic surfaces are defined by an ice adhesion strength τice < 100 kPa. However, the passive removal of ice requires much lower values of τice, such as on airplane wings or power lines (τice…
Abstract The reactive force-field (ReaxFF) interatomic potential is a powerful computational tool for exploring, developing and optimizing material properties. Methods based on the principles of quantum mechanics (QM), while offering valuable theoretical guidance at the electronic level, are often too computationally…
Το γλουταμινικό οξύ αποτελεί τον κύριο διεγερτικό νευροδιαβιβαστή στο Κεντρικό Νευρικό Σύστημα των θηλαστικών, παίζοντας σημαντικό ρόλο στη συναπτική πλαστικότητα καθώς και στις διαδικασίες μνήμης και μάθησης. Το γλουταμινικό οξύ ασκεί τις δράσεις του μέσω δύο ομάδων υποδοχέων, των ιοντοτρόπων και των μεταβοτροπικών υ…
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Une nouvelle génération de dispositifs électroniques et optoélectroniques combinant hautes performances et bas coût se profile grâce aux promesses des films à boîtes quantiques colloïdales (BQCs) et de leurs propriétés électriques et optiques uniques. Les BQCs sont des nanocristaux semi-conducteurs synthétisés en solu…
Le développement des polymères conducteurs, surtout en termes de stabilité, a permis de les intégrer dans les dispositifs électroniques pour des applications à haute valeur ajoutée. C'est la raison pour laquelle les condensateurs tantale initialement basés sur la technologie MnO2, en tant que cathode, ont été amélioré…
Caractérisation électrique et étude TEM des problèmes de fiabilité dans les mémoires à changement de phase enrichis en germanium Dans cette thèse, nous proposons une étude détaillée des mécanismes responsables de la perte de données dans les mémoires à changement de phase enrichies en germanium (Ge-rich PRAMs), à savo…
Nouvelles approches pour la synthèse de polyoléfines de haute performance Malgré les propriétés remarquables de polyéthylène de masse molaire très élevée(UHMWPE), une généralisation de son application est limitée en raison des difficultésrencontrées lors de sa mise en forme, liées au taux d’enchevêtrement important de…
Le développement des polymères conducteurs, surtout en termes de stabilité, a permis de les intégrer dans les dispositifs électroniques pour des applications à haute valeur ajoutée. C'est la raison pour laquelle les condensateurs tantale initialement basés sur la technologie MnO2, en tant que cathode, ont été amélioré…
Este trabalho apresenta o desenvolvimento e algumas conclusões do estudo da heterojunção de filmes finos de SnO2 e GaAs. Os filmes de SnO2, dopados com Ce3+, foram depositados a partir do método sol-gel usando as técnicas de dip e spin coating; os filmes de GaAs foram depositados por evaporação resistiva e por sputter…
No presente trabalho, considerou o estudo do potencial de utilização de sacos de cimento e embalagens de longa vida com o intuito de agregar valor a esses resíduos, mediante a fabricação de painéis de partículas para uso como forro em protótipos de galpões avícolas. Para fabricação desse material foi utilizado sacos d…
O óxido de zinco (ZnO) é um semicondutor muito utilizado na área tecnológica, principalmente em dispositivos fotovoltaicos e, mais recentemente, vem sendo utilizado em aplicações biomédicas. Porém, os efeitos citotóxicos, principalmente quando em tamanho nanométrico, associados ao seu uso, não devem ser descartados. A…