Materials Literature
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In recent years, the studies of thermal characteristics have gained importance since it is directly related to clothing comfort. One of the ways of achieving clothing comfort is through moisture management of textiles. Moisture management refers to the controlled movement of water vapor and perspiration from the surfa…
Magnetically recyclable Au/Co/Fe core-shell nanoparticles (NPs) have been successfully synthesized via a one-step in situ procedure. Transmission electron microscope (TEM), energy dispersive X-ray spectroscopic (EDS), and electron energy-loss spectroscopic (EELS) measurements revealed that the trimetallic Au/Co/Fe NPs…
We demonstrate an active metamaterial device that allows to electrically control terahertz transmission over more than one order of magnitude. Our device consists of a lithographically defined gold nano antenna array fabricated on a thin film of vanadium dioxide (VO(2)), a material that possesses an insulator to metal…
The synthesis of a series of platinum acetylide derivatives, featuring linear, triangular, and rectangular shapes, respectively, is described. The structures of these complexes were characterized by multinuclear NMR ( 1 H, 13 C, and 31 P), CSI-TOF mass spectrometry, and elemental analysis. It was found that these comp…
The growth of graphene on copper foil has attracted attention in the last two years due to its feasibility for a controllable growth process. One of the key issues remaining for practical application of graphene in solid-state devices is growth with a large grain size. Because the C–C bond in graphene is strong enough…
We numerically investigate the impact of epoxide adsorbates on the transport properties of graphene nanoribbons with width varying from a few nanometers to 15 nm. For the wider ribbons, a scaling analysis of conductance properties is performed for adsorbate density ranging from 0.1% to 0.5%. Oxygen atoms introduce a l…
Silk fibroin has attracted great interest in tissue engineering because of its outstanding biocompatibility, biodegradability and minimal inflammatory reaction. In this study, two kinds of biocomposites based on regenerated silk fibroin are fabricated by electrospinning and post-treatment processes, respectively. Firs…
We study surface modes at an interface separating two different layered metal-dielectric metamaterials. We demonstrate that, in a sharp contrast to the effective-medium approach predicting a single interface mode with the surface-plasmon dispersion, the transfer-matrix method reveals the existence of three types of lo…
One dimensional quantum-dot superlattices (1D-QDSLs) consisting of acoustically mismatched materials are demonstrated theoretically to possess sub-1 W m${}^{\ensuremath{-}1}$ K${}^{\ensuremath{-}1}$ thermal conductivity in the 50--400 K range of temperatures. We consider coherent Si/Ge 1D-QDSLs, as well as model Si/pl…
Phase-change GeTe/Sb2Te3 multilayered structures, in which the atomic motion at the layer interfaces is limited to one dimension, have been shown to require substantially lower switching energies when compared to monolithic alloys of the same average composition. Here, we report that in the GeTe/Sb2Te3 superlattice, a…
We use molecular dynamics (MD) simulations to examine phonon lifetimes in (10,10) carbon nanotubes (CNTs), both when isolated and when supported on amorphous SiO${}_{2}$ substrates. We determine the intratube phonon-phonon, interfacial, and CNT-substrate phonon scattering rates from the computed inverse lifetimes. Sus…
Three new N-alkyl substituted bis(imino)pyridine iron imide complexes, ((iPr)PDI)FeNR ((iPr)PDI = 2,6-(2,6-(i)Pr(2)-C(6)H(3)-N═CMe)(2)C(5)H(3)N; R = 1-adamantyl ((1)Ad), cyclooctyl ((Cy)Oct), and 2-adamantyl ((2)Ad)) were synthesized by addition of the appropriate alkyl azide to the iron bis(dinitrogen) complex, ((iPr…
Ready to direct: Crystalline selenidostannates were synthesized in imidazolium-based ionic liquids with a small amount of hydrazine monohydrate as additive (see scheme). They are the first open-framework chalcogenides structurally directed by imidazolium cations and are inaccessible by traditional methods.
Stable and luminescent Cu-doped ZnSe nanocrystals (NCs) were synthesized in organic solvents with octadecylamine (ODA) as the capping ligand and characterized using a combination of optical and structural characterization techniques. Successful doping was achieved by adding Cu during the growth phase of the NCs when t…
We report high-frequency scattering parameter measurement of large-area monolayer graphene integrated on low-loss quartz substrates. High-quality graphene was grown by chemical vapour deposition on copper, chemically hole doped, and transferred to quartz. Microwave measurements were performed from 0.01 to 110 GHz. Sim…
In our work we propose implementing fuzzy logic using memristors. Min and max operations are done by antipodally configured memristor circuits that may be assembled into computational circuits. We discuss computational power of such circuits with respect to m-efficiency and experimentally observed behavior of memristi…
Advancement of molecular devices will critically depend on the approach to establish electrical connections to the functional molecule(s). We produced a molecular device strategy which is based on chemically attaching of molecules between the two magnetic/nonmagnetic metallic electrodes along the multilayer edge(s) of…
Recent experiments have shown that sodium, a prototype simple metal at ambient conditions, exhibits unexpected complexity under high pressure. One of the most puzzling phenomena in the behaviour of dense sodium is the pressure-induced drop in its melting temperature, which extends from 1000 K at ~30GPa to as low as ro…
A comparative analysis of the structural phase transitions of EuTiO3 and SrTiO3 (at TS = 282 and 105 K, respectively) is made on the basis of phonon-dispersion and density functional calculations. The phase transition of EuTiO3 is predicted to arise from the softening of a transverse acoustic zone-boundary mode caused…
We present simulations of the dissociation of perfect dislocations into extended partial dislocations in aluminum, palladium, and nickel using a phase field dislocation dynamics (PFDD) theory that incorporates the $\ensuremath{\gamma}$ surface. As expected from dislocation theory, the simulations show that increasing…