Materials Literature
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The observation of twinned structures in one-dimensional nanomaterials is very rare. In this paper, we focused our attention on the synthesis of CuS twinned nanorods by a simple wet chemical method, the in situ source−template−interface reaction (ISTIR) route, at low reaction temperature (105 °C). The possible mechani…
Precursor-reduction method is employed to synthesize nanometer-sized ZnTe. Zinc blende ZnTe nanocrystals growth in three different shapes under various conditions, that is, quasi-spheres, tetrahedrons, and nanorods, have been observed. It is believed that the crystal growth of ZnTe is the rate-controlling step when su…
The high pressure behavior of bundled $1.35\ifmmode\pm\else\textpm\fi{}0.1\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ diameter single wall carbon nanotubes (SWNT) filled with ${\mathrm{C}}_{70}$ fullerenes (usually called peapods) has been investigated by Raman spectroscopy and compared with the corresponding behavior of…
High Resolution Image Download MS PowerPoint Slide First-principles calculations have been used to systematically screen >16 million mixtures of metal hydrides and related compounds to find materials with high capacity and favorable thermodynamics for reversible storage of hydrogen. These calculations are based on a l…
The growth of calcium carbonate (calcite) mesocrystals with self similar unique hierarchical superstructures is successfully realized by polymer-controlled crystallization. A mechanism involving the self-organization of smaller inorganic building blocks during the crystallization of calcium carbonate is proposed.
Nanowire arrays of amorphous carbon-coated single-crystal SnO2 with a mean diameter of approximately 80 nm were synthesized by annealing the anodic alumina membrane filled with SnO2 sol. HRTEM and SAED revealed the crystallography of the single crystal and the in situ formed amorphous carbon tubes. When they were used…
Hybrid organic-inorganic films consisted of molecular layers of a Keggin-structure polyoxometalate (POM: 12-tungstophosphoric acid, H(3)PW(12)O(40)) and 1,12-diaminododecane (DD) on 3-aminopropyl triethoxysilane (APTES)-modified silicon surface, fabricated via the layer-by-layer (LBL) self-assembly method are evaluate…
Abstract Half‐metallic Heusler alloys are among the most promising materials for future applications in spintronic devices. Although most Heusler alloys are ferromagnets, ferrimagnetic or antiferromagnetic (also called fully‐compensated ferrimagnetic) alloys would be more desirable for applications due to the lower st…
The intercalation of DNA into layered double hydroxides (LDHs) has various applications, including drug delivery for gene therapy and origins of life studies. The nanoscale dimensions of the interlayer region make the exact conformation of the intercalated DNA difficult to elucidate experimentally. We use molecular dy…
The purpose of this study was to synthesize biocompatible polyvinylpyrrolidone (PVP)-coated iron oxide (PVP-IO) nanoparticles and to evaluate their efficacy as a magnetic resonance imaging (MRI) contrast agent. The PVP-IO nanoparticles were synthesized by a thermal decomposition method and characterized by x-ray diffr…
Abstract PIB derivatives such as PIBSAs and the corresponding PIBSIs characterized by different contents of functional groups were prepared. They showed luminescence both in their neat form and in heptane solution when the amount of functional groups per polymer chain was higher than a critical value. This behavior is…
Surface modification of biomaterials is a way to tailor cell responses whilst retaining the bulk properties. In this work, chitosan membranes were prepared by solvent casting and treated with nitrogen or argon plasma at 20 W for 10-40 min. AFM indicated an increase in the surface roughness as a result of the ongoing e…
Abstract Ihre große spezifische Oberfläche und ihre physikochemischen Eigenschaften machen poröse Kohlenstoffmaterialien für viele Anwendungen interessant. Die konventionellen Herstellungsmethoden liefern jedoch nur uneinheitlich poröse Materialien, deren Porengrößenverteilungen, ganz zu schweigen von den Mesostruktur…
We employ reduced density-matrix functional theory in the calculation of the fundamental gap of open-shell systems. The formula for the calculation of the fundamental gap is derived with special attention to the spin of the neutral and the charged systems. We discuss the effects of different functionals as well as the…
I show that the so-called causality paradox of time-dependent density functional theory arises from an incorrect formulation of the variational principle for the time evolution of the density. The correct formulation not only resolves the paradox in real time, but also leads to a new expression for the causal exchange…
We propose that there exists a generic class of glass forming systems that have competing states (of crystalline order or not) which are locally close in energy to the ground state (which is typically unique). Upon cooling, such systems exhibit patches (or clusters) of these competing states which become locally stabl…
Spin precession and dephasing ("Hanle effect") provides an unambiguous means to establish the presence of spin transport in semiconductors. We compare theoretical modeling with experimental data from drift-dominated silicon spin-transport devices, illustrating the non-trivial consequences of employing oblique magnetic…
Two types of room temperature detectors of terahertz laser radiation have been developed which allow in an all-electric manner to determine the plane of polarization of linearly polarized radiation and the Stokes parameters of elliptically polarized radiation, respectively. The operation of the detectors is based on p…
We report results of investigations of the structural and transport properties of GaAs/Ga 1− x In x As/GaAs quantum wells (QWs) having a 0.5–1.8 monolayer (ML) thick Mn layer, separated from the QW by a 3 nm thick spacer. The structure has hole mobility of about 2000 cm 2 (V s) −1 , being by several orders of magnitud…
In the present paper, a new spirobenzopyran derivative was synthesized and applied in simultaneously colorimetric and fluorescence ratiometric detections of Cu2+. In contrast to the virtually photochromic character of the common spirobenzopyrans in most organic solvents, this spirobenzopyran is colorless in organic aq…