Materials Literature
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Activated carbons obtained from rice husk exhibit low specific surface areas when physical activation is applied due to its high silica content. The purpose of this work was to improve textural parameters of powdered activated carbons obtained from rice husk. To avoid the negative influence of the raw material ash con…
A new structure model (Hansen et al 2008 J. Phys.: Condens. Mater. 20 ) of ice Ic, so-called ‘cubic ice’(König 1943 Z. Kristallogr. 105 279), allows the description of the complex diffraction pattern in terms of stacking fault probabilities and anisotropic particle size. To understand the successive transitions when g…
We report the polarized Raman spectra of undoped $R\mathrm{FeAsO}$ ($R$=Sm, La) collected at room temperature from $ab$ surfaces of impurity-free microcrystals. The spectra exhibit sharp phonon lines on very weak electronic scattering background. The frequency and symmetry of the four Raman phonons involving out-of-pl…
We study the stability of orientationally disordered crystal phases in a suspension of colloidal hard dumbbells using Monte Carlo simulations. For dumbbell bond length L/sigma<0.4 with L the separation of the two spheres of the dumbbell and sigma the diameter of the spheres, we determine the difference in Helmholtz fr…
Nanodiamond (ND) particles were functionalized with V-shaped polymer brushes of polystyrene and poly( t -butyl methacrylate) (P t BMA) through the reaction of surface carboxylic groups of NDs toward epoxy functionalities located in the middle of the polymer precursor, an ABC-type triblock copolymer. The block copolyme…
Ice Ic, so-called 'cubic ice' (König 1943 Z. Kristallogr. 105 279–86), can be obtained, for example, from direct vapour deposition at low temperatures or by warming of recovered high-pressure forms of ice. It is usually obtained in the form of very small crystallites, leading to particle size broadening of the diffrac…
Phase-change memory, which switches reversibly between crystalline and amorphous phases, is promising for next generation data-storage devices. In this work, we present a novel, nonbinary data-storage device using core-shell nanowires to significantly enhance memory capacity by combining two phase-change materials wit…
The degradation of chitosan by high-intensity ultrasound (HIU) as affected by ultrasound parameters and solution properties was investigated by gel permeation chromatography coupled with static light scattering. The molecular weight, radius of gyration, and polydispersity of chitosan were reduced by ultrasound treatme…
We have performed a detailed angel-resolved photoemission spectroscopy study of in-situ prepared SrVO3 thin films. Naturally capped by a ``transparent'' protective layer, contributions from surface states centered at ~ -1.5 eV are dramatically reduced, enabling us to study the bulk V 3d states. We have observed a clea…
We studied the drift of electron spins under an applied dc electric field in single layer graphene spin valves in a field-effect transport geometry at room temperature. In the metallic conduction regime ($n\ensuremath{\simeq}3.5\ifmmode\times\else\texttimes\fi{}{10}^{16}\text{ }\text{ }{\mathrm{m}}^{\ensuremath{-}2}$)…
Using the complex Langevin sampling strategy, field theoretic simulations are performed to study the equilibrium phase behavior and structure of symmetric polycation-polyanion mixtures without salt in good solvents. Static structure factors for the segment density and charge density are calculated and used to study th…
More than tips: The electrochemical properties of the tips and sidewalls of carbon nanotubes can be compared when specific regions are selectively masked with a nonconducting polymer coating (e.g. polystyrene) such that the electrolyte has access to one region only (see scheme). Surprisingly electrochemistry at carbon…
At interfaces between polar and nonpolar perovskite oxides, an unusual electron-doping has been previously observed, due to electronic reconstructions. We report on remote hole-doping at an interface composed of only polar layers, revealed by high-resolution hard x-ray core-level photoemission spectroscopy. In LaAlO3/…
We present a first-principles study of heat conduction in a class of models which exhibit a new multi-step local thermalization mechanism which gives rise to Fourier's law. Local thermalization in our models occurs as the result of binary collisions among locally confined gas particles. We explore the conditions under…
The symmetry group analysis is applied to classify the phonon modes of $N$-stacked graphene layers (NSGLs) with $AB$ and $AA$ stacking, particularly their infrared and Raman properties. The dispersions of various phonon modes are calculated in a multilayer vibrational model, which is generalized from the lattice vibra…
Biodegradable shape memory polymers are exciting materials, based on a combination of controlled degradation and triggered actuation that enables the design of unique medical devices. However, their synthesis requires precise control over thermomechanical properties often not possible with common building blocks for b…
The indirect hydrogen storage capabilities of Mg(NH 3) 6Cl 2, Ca(NH 3) 8Cl 2, Mn(NH 3) 6Cl 2, and Ni(NH 3) 6Cl 2 are investigated. All four metal ammine chlorides can be compacted to solid tablets with densities of at least 95% of the crystal density. This gives very high indirect hydrogen densities both gravimetrical…
We consider a tight-binding model on the honeycomb lattice in a magnetic field. For special values of the hopping integrals, the dispersion relation is linear in one direction and quadratic in the other. We find that, in this case, the energy of the Landau levels varies with the field B as epsilon(n)(B) ~ [(n+gamma)B]…
The perovskite manganites with generic formula RE(1-x)AE(x)MnO(3) (RE = rare earth, AE = Ca, Sr, Ba and Pb) have drawn considerable attention, especially following the discovery of colossal magnetoresistance (CMR). The most fundamental property of these materials is strong correlation between structure, transport and…
We show that electronegativity can be used to effectively identify the hardness of crystal materials on the basis of a new microscopic model for hardness. Bond electronegativity is proposed to characterize the electron-holding energy of a bond, which is the intrinsic origin of hardness. Applying this model to $c\mathr…