Materials Literature
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We study step bunching under conditions of attachment/detachment limited kinetics in the presence of a deposition or sublimation flux, which leads to bunch motion. Analysis of the discrete step dynamics reveals that the bunch velocity is inversely proportional to the bunch size for general step-step interactions. The…
The electronic and geometrical properties of bulk americium and square and hexagonal americium monolayers have been studied with the full-potential linearized augmented plane wave (FP-LAPW) method. The effects of several common approximations are examined: (1) non-spin polarization (NSP) vs. spin polarization (SP); (2…
We study the mixed valence transition ($T$$_{v}$ $\sim$80 K) in EuNi$_{2}$(Si$_{0.2}$Ge$_{0.8}$)$_{2}$ using Eu 3$d-4f$ X-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (RESPES). The Eu$^{2+}$ and Eu$^{3+}$ main peaks show a giant resonance and the spectral features match very well with atom…
We present a detailed study of the phonon modes of the monoclinic compound BiB3O6 based on polarized reflectivity measurements on single crystals. The spectra are analysed by means of a generalized Drude-Lorentz model, which allows us to resolve the modes of A and B symmetry.
We report the detailed study of dielectric response of ${\mathrm{Pr}}_{0.6}{\mathrm{Ca}}_{0.4}\mathrm{Mn}{\mathrm{O}}_{3}$ (PCMO), a member of the manganite family showing colossal magnetoresistance. Measurements have been performed on four polycrystalline samples and four single crystals, allowing us to compare and e…
Confinement between two parallel surfaces is found, theoretically and experimentally, to drastically affect the hydrodynamic interaction between colloid particles, changing the sign of the coupling, its decay with distance and its concentration dependence. In particular, we show that three-body effects do not modify t…
The field-driven reorientation transition of an anisotropic ferromagnetic monolayer is studied within the context of a finite-temperature Green's function theory. The equilibrium state and the field dependence of the magnon energy gap $E_0$ are calculated for static magnetic field $H$ applied in plane along an easy or…
The waveguide properties of CdS nanoribbons have been studied spectroscopically and quantitatively. The locally produced band-edge photoluminescence could effectively travel several hundred micrometers along a single CdS nanoribbon (see image), and the emission band showed a significant red-shift with increasing trave…
We develop an analytic theory to estimate the glass transition temperature T(g) of polymer melts as a function of the relative rigidities of the chain backbone and side groups, the monomer structure, pressure, and polymer mass. Our computations are based on an extension of the semiempirical Lindemann criterion of melt…
Despite recent advances in electrospinning, creating highly ordered structure through the use of electrospun fibres is not possible. This is due to the chaotic motion of the electrospinning jet which means that the deposition location of the fibres covers a few centimetres radius. As a result, applications for electro…
Polycrystalline Zn1−xCoxO diluted magnetic semiconductors have been prepared by coprecipitation technique in the concentration range 0⩽x⩽0.1. Structure, composition analysis, and optical absorption measurements revealed that cobalt is incorporated into the lattice, as Co2+ substituting Zn2+ ions, forming a solid solut…
ZnO nanostructures of different morphologies were grown in a controlled manner using a simple low-temperature hydrothermal technique. Controlling the content of ethylenediamine (soft surfactant) and the pH of the reaction mixture, nanoparticles, nanorods, and flowerlike ZnO structures could be synthesized at temperatu…
Spherical cerium oxide nanoparticles and microsized rod-shaped and spindle-like CeO 2 structures have been synthesized using a polyol method. When the duration of reaction and the concentration of cerium precursor are controlled, CeO 2 products of different morphologies can be selectively produced. Results from XRD, X…
Stand and deliver! The release of pore-encapsulated fluorescein molecules from a core/shell mesoporous silica nanorod/superparamagnetic iron oxide nanoparticle carrier in the presence of an external magnetic field and only in response to cell-produced antioxidants indicates promise for such systems in controlled-relea…
New lanthanide−transition metal (Ln–M) carbonyl compounds were prepared and the structural relationships of the metal combinations were discerned. Numerous compounds derived from combinations of divalent lanthanides with transition metal carbonyls in groups 7–9 were isolated. Three different types of interactions were…
We study the switching dynamics in two-domain and four-domain twisted nematic liquid-crystal devices. The equilibrium configuration of these devices involves the coexistence of regions characterised by different handedness of the inherent director twist. At the boundaries between these regions there are typically disc…
Chemical conjugation of bisphosphonates (BPs) to proteins is an effective means to enhance binding of proteins to mineral-containing biomaterials. BPs linked to proteins with reversible (i.e., cleavable) linkages were considered desirable over the conjugates linked with stable linkages because cleavable linkages allow…
The magnetic structure of the compound $\mathrm{Tb}{\mathrm{Co}}_{3}{\mathrm{B}}_{2}$ has been studied in the temperature range $1.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}\ensuremath{\leqslant}T\ensuremath{\leqslant}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ by means of neutron powder diffraction, magnetization, magnetic…
A hybrid density-functional-theory and molecular-dynamics simulation scheme was proposed [Ogata et al., Comput. Phys. Commun. 149, 30 (2002)] in which a total atomistic system is partitioned, in real space, into the quantum (QM) region whose electronic structure is calculated with the density-functional theory and the…
Abstract Studies were performed on the nature and magnitude of the variabilities in the rheological and processing properties of purified natural rubber (PNR). PNR samples were prepared from three clones of NR (RRIM 600, GT 1, and KRS 156). The corresponding whole NR (WNR) containing total nonrubber substances was als…