Materials Literature
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Abstract This work presents a new type of feed‐back active coating with inhibitor‐containing reservoirs for corrosion protection of metallic substrates. The reservoirs are composed of stratified layers of oppositely charged polyelectrolytes deposited on AA2024 aluminum alloy coated with hybrid sol‐gel film. The layer‐…
A processing route for freeze‐casting of particle suspensions is presented, where the microstructure development during the solidification process can be controlled precisely. For this purpose, the single‐side cooling and double‐side cooling methods are compared. A procedure will be shown to control the freezing proce…
Phonon sideband optical spectroscopy determines the energy of the dark K-momentum exciton for (6,5) carbon nanotubes. One-phonon sidebands appear in absorption and emission, split by two zone-boundary (K-point) phonons. Their average energy locates the E11 K-momentum exciton 36 meV above the E11 bright level, higher t…
NdF3/SiO2 nanoparticles demonstrate highly efficient fluorescence due to successful suppressions of concentration quenching and surface quenching. More interestingly, their excitation and emission peaks with large frequency separation are both in the “near-infrared optical window” of biotissues. In living animal studi…
We investigated third harmonic generation in NiO thin films, which exhibit unipolar resistance switching behavior. We found that the low resistance states of the films were strongly nonlinear, with variations in the resistance R as large as 60%. This strong nonlinear behavior was most likely caused by Joule heating of…
Helium defect properties in V, Nb, Ta, Mo, and W were studied using first-principles electronic structure calculations. The most stable position for the He in all bcc metals is a substitutional site; the tetrahedral interstitial position is more favorable than the octahedral position. The formation energy of He substi…
Abstract Transparent conducting oxides (TCOs) are increasingly critical components in photovoltaic cells, low‐e windows, flat panel displays, electrochromic devices, and flexible electronics. The conventional TCOs, such as Sn‐doped In 2 O 3 , are crystalline single phase materials. Here, we report on In‐Zn‐O (IZO), a…
Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr$_{2}$O$_{4}$, we discuss its low-energy fluctuation spectrum. We identify the Goldstone modes of the conical cycloidal order, and deduce their dispersion r…
We investigate the modification of the intrinsic carrier noise spectral density induced in low-doped semiconductor materials by an external correlated noise source added to the driving high-frequency periodic electric field. A Monte Carlo approach is adopted to numerically solve the transport equation by considering a…
By measuring the magnetization hysteresis loops of superconducting Ba0.6K0.4Fe2As2 single crystals, we obtained the high upper critical field and large current carrying ability, which point to optimistic applications. The fishtail (or second peak) effect is also found in the material, and the position of the vortex pi…
For this study, Cu-In-S nanocrystals were developed as a low toxic fluorescent. The stoichiometric CuInS(2) nanocrystals were synthesized facilely by heating a solution of metal complexes and dodecanethiol. The fluorescence would be originated from the crystal defect. We intentionally introduced the crystal defect in…
Spark‐plasma sintering (SPS) has the potential for rapid (with heating rates reaching several hundred K/min) and efficient consolidation of a broad spectrum of powder materials. Possible mechanisms of the enhancement of consolidation in SPS versus conventional techniques of powder processing are categorized with respe…
Electroresponsive photonic Janus balls with optical and electrical anisotropy were prepared using a high-throughput optofluidic device, which produced monodisperse emulsion drops. Self-organized colloidal crystals in emulsion droplets displayed isotropic structural colors in their own respective domains. Electrical an…
The early stages of epitaxial graphene layer growth on the Si-terminated 6H-SiC (0001) are investigated by Auger electron spectroscopy (AES) and depolarized Raman spectroscopy. The selection of the depolarized component of the scattered light results in a significant increase in the C-C bond signal over the second ord…
Hyaluronic-acid immobilized monodisperse magnetic nanocrystals (HA-DN/MNCs) are synthesized. Dopamine, the analogue of 3,4-dihydroxy-L-phenylalanine responsible for the adhesion properties in proteins excreted by mussels, plays a key role in the surface modification of nanocrystals. HA-DN/MNCs exhibit great stability…
We investigate the ultrafast relaxation dynamics of hot Dirac fermionic quasiparticles in multilayer epitaxial graphene using ultrafast optical differential transmission spectroscopy. We observe differential transmission spectra which are well described by interband transitions with no electron-hole interaction. Follo…
A colloquium-style introduction to two electronic processes in a carbon monolayer (graphene) is presented, each having an analog in relativistic quantum mechanics. Both processes couple electronlike and holelike states, through the action of either a superconducting pair potential or an electrostatic potential. The fi…
Stable graphene suspensions are prepared using a new, green, and intriguing synthetic route. Graphene can be directly prepared by the fast deoxygenation of exfoliated graphite oxide in strong alkaline solutions at low temperatures (50–90 °C), in the absence of reducing agents. This study opens an opportunity towards t…
The vast accumulation of protein structural data has now facilitated the observation of many different complexes in the PDB for the same protein. Therefore, a single protein complex is not sufficient to identify their interaction sites, especially for proteins with multiple binding states or different partners, such a…
We show that the cycloidal magnetic order of a multiferroic can arise in the absence of spin and lattice anisotropies, for e.g., in a cubic material, and this explains the occurrence of such a state in CoCr$_2$O$_4$. We discuss the case when this order coexists with ferromagnetism in a so called `conical cycloid' stat…