Materials Literature
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Upconversion nanophosphors have the ability to generate visible or near-infrared (NIR) emissions under continuous-wave NIR excitation. Utilizing this special photoluminescent properties, upconversion nanophosphors can be used as key components in complex nanocomposites for a wide range of applications. This review sum…
For the first time, polyethyleneimine (PEI) doping on multilayer MoS2field-effect transistors is investigated. A 2.6 times reduction in sheet resistance and 1.2 times reduction in contact resistance have been achieved. The enhanced electrical characteristics are also reflected in a 70% improvement in ON-current and 50…
Graphene electronic devices can be made by top-down (TD) or bottom-up (BU) approaches. This Perspective defines and explains those two approaches and discusses the advantages and limitations of each, particularly in the context of graphene fabrication. It is further exemplified using graphene nanoribbons as the protot…
The two-coordinate cationic Ni(I) bis-N-heterocyclic carbene complex [Ni(6-Mes)2]Br (1) [6-Mes =1,3-bis(2,4,6-trimethylphenyl)-3,4,5,6-tetrahydropyrimidin-2-ylidene] has been structurally characterized and displays a highly linear geometry with a C-Ni-C angle of 179.27(13)°. Density functional theory calculations reve…
We calculate from first principles the electronic structure and optical properties of a number of transition metal dichalcogenide (TMD) bilayer heterostructures consisting of MoS${}_{2}$ layers sandwiched with WS${}_{2}$, MoSe${}_{2}$, MoTe${}_{2}$, BN, or graphene sheets. Contrary to previous works, the systems are c…
Exposure to ultraviolet (UV) radiation may cause the significant degradation of many materials. UV radiation causes photooxidative degradation which results in breaking of the polymer chains, produces free radical and reduces the molecular weight, causing deterioration of mechanical properties and leading to useless m…
Abstract : Isolation of single-walled carbon nanotubes (SWNTs) remains to be a key step for realization of the true potential of SWNTs, since the physical properties of SWNTs are dependent on the tube s chirality index (n, m). Polymers with enhanced helical conformation are found to be an efficient sorting mechanism f…
Eine wenig bekannte Eigenschaft, welche auf textilen Oberflächen auftritt ist der Schreibeffekt. Dieser entsteht, indem ein stumpfer Gegenstand über die Oberfläche des Textils gezogen wird, ähnlich der Kratzspur eines Fingernagels. Bei diesem Effekt zeigen sich linienförmige bis flächige Farbtonveränderungen auf der O…
Dados dinâmicos de fase condensada podem ser obtidos por espectroscopia Raman a partir da análise da região de frequências baixas, ω<200 cm-1 em que encontra-se a faixa de energia relativa às vibrações intermoleculares do sistema, ou a partir da análise da forma de linha de modos vibracionais intramoleculares de alta…
A instalação de implantes odontológicos requer a presença de substrato ósseo adequado para garantir estabilidade e equilíbrio biomecânico. A deficiência óssea requer procedimentos de enxertia para adequar o volume para a instalação de implantes, porém a utilização de enxertos autógenos causa aumento de morbidade ao pa…
Esta tese apresenta as espectroscopias de fotoluminescência, excitação e fotoacústica de amostras MgGa2O4 dopadas com 0,1%, 0,5% e 1,0% de Ni2+, obtidas pelo método de estado sólido e duas amostras distintas GaNbO4-GaNb11O29-Ga2O3 dopadas com 1,0% de Cr3+, uma sintetizada por reação de estado sólido e a outra pelo mét…
The van der Waals-London's law, for a collection of atoms at large\nseparation, states that their interaction energy is pairwise attractive and\ndecays proportionally to one over their distance to the sixth. The first\nrigorous result in this direction was obtained by Lieb and Thirring [LT], by\nproving an upper bound…
We study eigenvalue spacings and local eigenvalue statistics for 1D lattice Schrodinger operators with Holder regular potential, obtaining a version of Minami's inequality and Poisson statistics for the local eigenvalue spacings. The main additional new input are regular properties of the Furstenberg measures and the…
Abstract Review: 27 refs.
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Abstract Review: 23 refs.
A multifunctional electrospinning system has been developed to fabricate diversified nanofibrous structures. It consists of a high voltage power supply, a syringe pump, and a cage like collector that are dominated via the controller by setting parameters from a touch screen. As the key component, speed, and diameter o…
Compounds Through Stereoselective Catalytic Cross-Metathesis. -The authors describe three catalysts for the Z-selective cross-metathesis of allyl-and alkenylboron substrates. The reaction products (IX) are sensitive to isolation and purification and therefore directly converted to (XI). The utility of this cross-metat…
Abstract Review: 35 refs.
Functional materials, a special category of materials possessing native capabilities that can convert energy from one form to another, are comprised of many different classes of material: polymers,...