Materials Literature
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The growth of ultrathin diamondlike carbon (DLC) films is modeled using molecular dynamics (MD) simulations with the reactive empirical bond order (REBO) potential. The microstructure and stress properties, such as film density, $s{p}^{3}$ hybridization fraction and internal stress, are carefully analyzed. A close cor…
The low-energy electronic properties of a few graphite layers with AA and ABC stacking under application of the electric field ( F ), perpendicular to the layers, are explored through the tight-binding model. They strongly depend on the interlayer interactions, the stacking sequences, the layer numbers, and the field…
The lasing wavelength of dye-doped cholesteric liquid-crystal lasers is optically tuned by the reversible photoisomerization of the azo- or azoxy- nematic components of the cholesteric mixture. The figure demonstrates that the laser can be tuned over a range of almost 70 nm. The nematic components are easily and rever…
The two-dimensional (2D) polymeric spin crossover (SCO) compound Fe(py)2[Ag(CN)2]2 has been synthesized. The compound shows a two-step spin transition detected by magnetic, heat capacity, and X-ray diffraction measurements. The magnetic moment shows a high-temperature step (step 1) occurring at 146.3 K without hystere…
We have investigated the effect of Nafion and its resulting interaction with single-walled carbon nanotubes (SWCNTs) on the solubility and dispersion properties of SWCNTs in bisolvent. Nafion was used as a polymeric dispersant, providing both electrostatic and steric stabilization in the preparation of a stable and ho…
Multiwalled carbon nanotubes (MWCNTs) were covalently modified with fourth-generation NH 2 -terminated poly(amido amine) (G4-PAMAM) dendrimers, named CNT/DEN. The covalent linkages between CNT and dendrimers were identified by an infrared absorption spectrometry, and the weight content of G4-PAMAM dendrimers in CNT/DE…
The ability to tune interparticle spatial properties of nanoparticle assemblies is essential for the design of sensing materials toward desired sensitivity and selectivity. This paper reports findings of an investigation of molecularly mediated thin film assemblies of metal nanoparticles with controllable interparticl…
The nature of the active Ti species in TiCl 3 -doped NaAlH 4, a promising hydrogen storage material, was studied as a function of the desorption temperature with Ti K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy, Ti K-edge X-ray absorption near-edge structure (XANES) spectroscopy, and X-ray diffr…
The fabrication of Pt nanoparticles encapsulated in hollow carbon nanospheres using TiO2 nanoparticles as both the photocatalyst and the inorganic mold is demonstrated (see figure). These spheres are found to have high surface area and ultrathin shells with well-developed microporosity, and thus can be used as catalys…
A new polymer multilayer fabrication method that employs employing thin films of lamellar polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) is presented. The effectiveness of the technique is demonstrated by patterning nanometer-scale silicon wire arrays. A multilayer patterning process that features defect-free…
Dispersion of single-walled carbon nanotubes in water with the use of sodium dodecylsulfate allows the study of properties of individual nanotubes. Nanotube isolation is maintained in the dispersions by the electrostatic repulsion between the dodecylsulfate groups adsorbed on the nanotube surface. We present data show…
A simple seed-layer assisted electrochemical deposition (ECD) route has been successfully developed for preparation of different ZnO nanostructures, and their optical and field emission properties are also studied. ZnO films, nanowires, and nanosheets could be prepared in a rational way by just controlling the ECD cur…
This work focuses on the development of electrically conducting porous nanocomposite structures by the incorporation of multiwalled carbon nanotubes (MWNT) into electrospun poly(ethylene oxide) (PEO) nanofibers. Electron microscopy confirmed the presence of individual aligned MWNT encapsulated within the fibers and sh…
We propose a two-dimensional electron gas (2DEG) system in which an external magnetic (B) field with a small chirality is applied to provide a topological U(1) U(1) gauge field that separates conduction electrons of opposite spins in the transverse direction. Additionally, the vertical electric (E) field in the 2DEG,…
We show that the propagation of spin polarized carriers may be dramatically affected by {\em inhomogeneous} electric fields. Surprisingly, the spin diffusion length is found to strongly depend on the sign and magnitude of electric field \emph{gradients}, in addition to the previously reported dependence on the sign an…
1-Thioglycerol-capped CdTe nanocrystals were used as core template to generate CdTe/CdS core−shell nanocrystals in aqueous solution by means of ultrasonic irradiation. The photoluminescence quantum yields of CdTe/CdS core−shell nanocrystals were up to 20%, larger than the original CdTe nanocrystals by around 10 times.…
Half-metallic antiferromagnets are the ideal materials for spintronic applications since their zero magnetization leads to lower stray fields and thus tiny energy losses. Starting from the Mn$_2$VAl and Mn$_2$VSi alloys we substitute Co or Fe for Mn and we show by means of first-principle electronic structure calculat…
We fabricated a current-perpendicular-to-plane pseudo-spin-valve nanopillar comprising a thick and a thin Co rings with deep submicron lateral sizes. The dc current can effectively induce the flux-closure vortex states in the rings with desired chiralities. Abrupt transitions between the vortex states are also realize…
We compared quantity and structures of food-derived gelatin hydrolysates in human blood from three sources of type I collagen in a single blind crossover study. Five healthy male volunteers ingested type I gelatin hydrolysates from fish scale, fish skin, or porcine skin after 12 h of fasting. Amounts of free form Hyp…
By using the highly oriented 1:1 stoichiometric blend of high-molecular-weight PLLA and middle-molecular-weight PDLA species and by choosing a suitable annealing condition, we have succeeded for the first time to observe the phase transition phenomenon in the heating and cooling processes by measuring the temperature…