Materials Literature
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We analyze spin splitting of the two-dimensional hole spectrum in strained asymmetric SiGe quantum wells (QWs). Based on the Luttinger Hamiltonian, we obtain expressions for the spin-splitting parameters up to the third order in the in-plane hole wavevector. The biaxial strain of SiGe QWs is found to be a key paramete…
In their comment, A. Hakansson, J. Sanchez-Dehesa, F. Cervera, F. Meseguer, L. Sanchis, and J. Llinares say that our conclusion stating that diffraction prevails over refraction in acoustic lenses whose aperture is of several wavelengths, such as those addressed in our calculations [N. Garcia, M. Nieto-Vesperinas, E.…
In antiferromagnetic nanoparticles magnetization the linear component, $χ_{AF}$H superposed to the saturation one usually complicates the fit of experimental data. We present a method based on scaling laws to determine the variation of $χ_{AF}$ with temperature and to find the temperature dependence of the average mag…
Harrison's tight-binding theory provides an excellent qualitative description of the electronic structure of the elements across the periodic table. However, the resulting band structures are in significant disagreement with those found by standard methods. We developed a new procedure to generate both the prefactors…
Recent progress in the synthesis and processing of nano-structured materials and systems calls for an improved understanding of thermal properties on small length scales. In this context, the question whether thermodynamics and, in particular, the concept of temperature can apply on the nanoscale is of central interes…
The formation of colloids based on polyelectrolyte complexes (PECs) of biopolymers was investigated through the complexation between two charged polysaccharides, chitosan as polycation, and dextran sulfate as polyanion. The slow dropwise addition of components, generally used for the formation of PECs, allowed to elab…
A variety of complex inorganic solids with open-framework and other fascinating architectures, involving silicate, phosphate, and other anions, have been synthesized under hydrothermal conditions. The past few years have also seen the successful synthesis and characterization of several molecular compounds that can ac…
Dyeing effluent is one of the largest contributors to textile effluent and such colored wastewater has a seriously destructive impact on the environment. Adsorption can be a very effective treatment for decolorization of textile dyeing effluent, but current techniques employ adsorption chemistry that is not particular…
We report periodic spin-polarized density functional theory (DFT) predictions of hydrogen adsorption, absorption, dissolution, and diffusion energetics on and in ferromagnetic (FM) body-centered cubic (bcc) iron. We find that H prefers to stay on the Fe surface instead of subsurfaces or in bulk. Hydrogen dissolution i…
Surface roughness is known to amplify hydrophobicity. The apparent contact angle of a drop on a rough surface is often modeled using either Wenzel's or Cassie's formulas. These formulas, along with an appropriate energy analysis, are critical in designing superhydrophobic substrates for applications in microscale devi…
Recent research activities on metamaterials, in particular left-handed materials, have not only demonstrated interesting physical phenomena but have also lead to the realisation of promising new types of high frequency components and devices. It is difficult but interesting to consider the prospects for these material…
Abstract Summary: A new class of macromolecules containing neutral and cationic organoiron moieties with arylazo chromophores in their backbones has been prepared. Photolysis of these polymers resulted in the removal of the cationic iron moieties leading to new polyferrocenes with azo dyes in their backbones. UV‐vis s…
Abstract The use of natural plant oils in the production of adhesives has been the focus of much research because natural oils are a renewable resource which have environmental and economic advantages over the petroleum‐derived chemicals used in traditional adhesives. The network formation and the stress–strain behavi…
[reaction: see text] Starting from tetrakis(3,5-bis(bromomethyl)phenyl)porphyrin, pincer-porphyrin hybrid molecules (tetrakis(ECE-pincer)porphyrin; E = N, P, S) based on a tetraphenylporphyrin skeleton have been prepared in high yields. These multi-ligand site compounds could be selectively metalated at their peripher…
Abstract Aqueous poly(urethane‐urea) dispersions were prepared by the prepolymer mixing technique without the use of any organic solvent. Most of the work focused on the use of two aliphatic diisocyanates (α,α, α', α'‐tetramethyl‐1,3‐xylylene diisocyanate and isophorone diisocyanate) and two macrodiols (α,ω‐poly(propy…
Abstract Direct current (DC) current‐voltage ( I‐V ) characteristics of silicone rubber filled with conductive carbon black (CB) were studied at room temperature in the voltage range of 1–46 V. The current‐voltage relationship can be expressed as I = AV B , where A and B are constants that show capability and property…
The effect of disorder due to anti sites on the charge-transfer processes in the double perovskite Sr 2 FeMoO 6 has been assessed at the microscopic level, using 57 Fe Mössbauer spectroscopy. We have followed over a very broad temperature range (from 673 to 4.2 K) the spectral response of three polycrystalline samples…
The structure and fabrication of a photo-luminescent screen for an optically written display based on upconversion of near infrared light is presented. Some of the rare earth doped fluoride crystals upconversion photo-luminescent materials are given. A uniform screen with a densely packed layer for high-resolution pro…
The pressure-driven phase transformation from the sphalerite (B3) to rock salt (B1) crystal structures is studied in “constant stress” molecular dynamics simulations of ionic nanocrystals. Direct observation and calculated diffraction patterns confirm the transition. The mechanism is described and is shown to have con…
The sliding in a Ni symmetrical tilt grain boundary, $\ensuremath{\Sigma}5$ (012) [100], is investigated by modified Parrinello-Rahman molecular dynamics which deals with the thermodynamic ensemble characterized by the number of atoms $N$, temperature $T$, and the shear stress $\mathbf{t}$. It is found that the grain…