Materials Literature
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Utilizing the unique features of photochromic compounds to control aggregation enables the generation of photoresponsive gels. Self-assembly mediated by hydrogen bonding in open and closed dithienylcyclopentene photoswitches carrying chiral amide moieties can be used to reversibly transcribe molecular into supramolecu…
We have used anomalous small-angle X-ray scattering (ASAXS) to investigate the spatial correlation of counterions with a macroion consisting of polyelectrolyte brushes. The spherical polyelectrolyte brush is composed of a solid poly(styrene) core of 68 nm radius with a dense grafting of linear poly(acrylic acid) chain…
The special branch: Tetrapod-branched ZnSe nanorod architectures have been synthesized via a simple Sn-catalyzed thermal evaporation process. Each branch within these architectures has a hexagon-like cross section and well- defined crystallographic facets, thus forming a regular hexagonal prismatic structure. The leng…
A micro tool for evaluating thermoelectric properties of low-dimensional materials is developed. It is expected that a one-dimensional thermoelectric material exhibits superior thermoelectric properties and low thermal conductivity due to its inherent nanoscale structure. By using these superior properties, high effic…
The effect of disorder on the critical properties of the ferromagnetic phase transition in colossal magnetoresistive manganite ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ has been studied by substituting $\mathrm{Ga}$ for $\mathrm{Mn}$. It is found that, upon 10% $\mathrm{Ga}$ substitution, the peak i…
A new end-on (EO) azido-bridged tetranuclear copper(II) complex [Cu(4)L(2)(mu(1,1)-N(3))(2)].5H(2)O derived from the ligand H(3)L (N,N'-(2-hydroxylpropane-1,3-diyl)bis-salicylideneimine) has been synthesized. Its X-ray structure shows an unusual Cu(4)O(2)N(2) open cubane core in which four copper(II) atoms are connect…
A simple hydrothermal reduction method, employing sodium tellurate (Na 2 TeO 4 ·2H 2 O) as tellurium source and formamide (HCONH 2 ) as a reductant, was used to prepare and investigate tellurium nanotubes. The diameters of the nanotubes range from 200 to 600 nm and their lengths from 4 to 15 μm. Unlike studies reporte…
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Electrons and holes are locally injected in a single pentacene monolayer island. The two-dimensional distribution and concentration of the injected carriers are measured by electrical force microscopy. In crystalline monolayer islands, both carriers are delocalized over the whole island. On disordered monolayer, carri…
We investigate the minimal field strength in precessional magnetization switching using the Landau-Lifshitz-Gilbert equation in under-critically damped systems. It is shown that precessional switching occurs when localized trajectories in phase space become unlocalized upon application of field pulses. By studying the…
We have studied the shock-induced phase transition from fullerite to a dense amorphous carbon phase by tight-binding molecular dynamics. For increasing hydrostatic pressures P, the C60-cages are found to polymerise at P<10 GPa, to break at P~40 GPa and to slowly collapse further at P>60 GPa. By contrast, in the presen…
We calculate the frequency-dependent mesoscopic acoustic phonon transmission probability through the abrupt junction between a semi-infinite, one-dimensional cylindrical quantum wire and a three-dimensional bulk insulator, using a perturbative technique that is valid at low frequency. The system is described using ela…
The interaction potential of a $\mathrm{Li}$ atom with a graphene layer is calculated using the local density approximation to the density functional theory. Two configurations corresponding to different separations between $\mathrm{Li}$ in neighboring supercells were considered to determine the effect of $\mathrm{Li}…
The polymorphism of the simple amino acid glycine has been known for almost a century. It is also known that in aqueous solutions, at the isoelectric point (pI 5.9), the metastable alpha polymorph crystallizes, while the stable gamma form of glycine only nucleates at high and low pH. Despite the importance of understa…
Thermoelectric power, electrical conductivity, and high field Hall effect were studied over a broad temperature range in ferromagnetic Ga(1-x)Mn(x)As epitaxial layers (0.01570 K) the thermoelectric power in GaMnAs linearly increases with increasing temperature. That indicates the presence of a degenerate hole gas with…
We present results of an ultraviolet photoemission spectroscopy study of artificially synthesized poly(dA)-poly(dT) DNA molecules on $p$-type Si substrates. For comparison, we also present the electronic density of states (DOS) calculated using an \emph{ab initio} tight-binding method based on density-functional theor…
Hydrothermal reaction of CoCl2 with the potassium salt of pyridine-2,3-dicarboxylic acid and excess base yields [Co3(NC5H3(CO2)2-2,5)2(mu3-OH)2(OH2)2], which has a three-dimensional structure based on hydroxide-bridged triangular chains. The magnetic behavior of this compound shows the presence of three distinct regio…
Single wall carbon nanotube films (bucky paper ) have been prepared using aqueous dispersions containing 0, 3, 6, and 10 M nitric acid. With increasing nitric acid concentration, film tensile strength increased from 10 to 74 MPa, tensile modulus from 0.8 to 5.0 GPa, while in-plane dc electrical conductivity decreased…
We demonstrate that the magnetic properties of diluted magnetic semiconductors are dominated by short ranged interatomic exchange interactions that have a strong directional dependence. By combining first principles calculations of interatomic exchange interactions with a classical Heisenberg model and Monte Carlo sim…
The particle dynamics in a liquid exhibits a transient spatial distribution of dynamic heterogeneities. The relationship between this kinetic structure and the underlying particle configuration remains an outstanding problem. In this Letter, we present a general simulation technique for identifying the features of the…