Materials Literature
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Hollow structures on the submicrometer scale (nm) are obtained with the assembly of polyelectrolytes according to the layer-by-layer (LbL) technique. Following the LbL procedure, polymers alginate and chitosan were alternatively adsorbed on a vesicular template made of didodecyldimethylammonium bromide (DDAB). Evidenc…
A simple and green strategy is presented to decorate ZnO nanorod array, based on electrophoresis deposition in the Au colloidal solution prepared by laser ablation in water and subsequent further laser irradiation. The surface of nanorods is homogeneously decorated with Au nanoparticles. The Au nanoparticles have good…
We present a first-principles study of the electronic transport properties of micrometer long semiconducting carbon nanotubes randomly covered with carbene functional groups. Whereas prior studies suggested that metallic tubes are hardly affected by such addends, we show here that the conductance of semiconducting tub…
In this work, scattering mechanisms in the highly efficient thermoelectric material ${\text{La}}_{3\ensuremath{-}x}{\text{Te}}_{4}$ are investigated by controlling the carrier concentration via anion substitution in the nominally vacancy-free compositions ${\text{La}}_{3}{\text{Te}}_{4\ensuremath{-}z}{\text{Sb}}_{z}$…
This work presents the vacuum ultraviolet−visible spectroscopic properties of Tb 3+ in Li(Y, Gd)(PO 3 ) 4:Tb 3+ phosphors prepared by a high-temperature solid-state reaction. Under vacuum ultraviolet light excitation, tunable emission from the greenish-blue to yellowish-green region was obtained by changing the doping…
A boradiazaindacene (BODIPY) fluorophore with a chirality held on the central boron has been synthesized and the racemate resolved. Dissymetrization of the BODIPY core was obtained by oxidation of the 3-methyl group to the corresponding carboxaldehyde. A hydrogen bond between the aldehyde proton and the fluorine on th…
Electromagnetic metamaterials are artificially structured media typically composed of arrays of resonant electromagnetic circuits, the dimension and spacing of which are considerably smaller than the free-space wavelengths of operation. The constitutive parameters for metamaterials, which can be obtained using full-wa…
The electronic properties of single- and multication transparent conducting oxides (TCOs) are investigated using first-principles density-functional approach. A detailed comparison of the electronic band structure of stoichiometric and oxygen deficient ${\text{In}}_{2}{\text{O}}_{3}$, $\ensuremath{\alpha}$, and $\ensu…
Using the coherent-potential approximation, we have studied the effects of excess Fe, Se deficiency and substitutions of S and Te on the Se sub-lattice and Co, Ni and Cu on the Fe sub-lattice in FeSe. Our results show that (i) a small amount of excess Fe substantially disorders the Fe-derived bands while an Se deficie…
We present measurements of the anisotropic magnetoresistance (AMR) of La(0.75)Sr(0.25)MnO(3) films deposited on (001) SrTiO(3) substrates, and a model that describes the experimental results. The model, based on the electronic structure of manganites plus the spin-orbit coupling, correctly accounts for the dependence…
The origin of the anomalous, 400% increase of the piezoelectric coefficient in Sc$_x$Al$_{1-x}$N alloys is revealed. Quantum mechanical calculations show that the effect is intrinsic. It comes from a strong change in the response of the internal atomic coordinates to strain and pronounced softening of C$_{33}$ elastic…
The influence of atomic vibrations on x-ray absorption near-edge structure is calculated by assuming that vibrational energies are small with respect to the instrumental resolution. The resulting expression shows that, at the $K$ edge, vibrations enable electric-dipole transitions to $3s$ and $3d$ final states. The th…
The induced charge density, ${\ensuremath{\rho}}_{ind}(\mathbit{r})$, generated in graphene by the potential well of the finite radius $R$ is considered. The result for ${\ensuremath{\rho}}_{ind}(\mathbit{r})$ is derived for large distances $r⪢R$. We also obtained the induced charges outside of the radius $r⪢R$ and in…
Using density functional theory and LDA+U method, we investigate magnetic and electronic structure of Y$_{2}$Ir$_{2}$O$_{7}$ and rare-earth based pyrochlore iridates. Our study reveals that the ground state is a non-collinear magnetic insulating state. Due to strong spin-orbit coupling in Ir 5\textit{d}, there is an u…
We formulate a phenomenological elasto-plastic theory to describe a solid undergoing a structural transition from a square (p4mm) to an oblique (p2) lattice in two dimensions. Within our theory, the components of the strain may be decomposed additively into separate elastic and plastic contributions. The plastic strai…
Lithium borohydride (LiBH 4 ) is a promising material for hydrogen storage, with a gravimetric hydrogen content of 18.5%. However, the thermodynamics and kinetics of its hydrogen release and uptake need to be improved before it can meet the requirements for mobile applications. In this study, we investigate the confin…
We report a new approach to controlling the fusion activity of liposomes by adsorbing carboxyl-modified gold nanoparticles to the outer surface of phospholipid liposomes. The bound gold nanoparticles can effectively prevent liposomes from fusing with one another at neutral pH value, while at acidic environments (e.g.,…
Cross-linking gelatin with natural phenolic compound caffeic acid (CA) or tannic acid (TA) above pH 9 resulted in formation of insoluble hydrogels. The cross-linking reactivity was controlled by variation of pH, the concentration of the gelatin solution, or the amount of CA or TA used in the reaction. The cross-linkin…
We explored the effect of Cd substitution on the thermoelectric properties of PbTe in an effort to test a theoretical hypothesis that Cd atoms on Pb sites of the rock salt lattice can increase the Seebeck coefficient via the formation of a resonance level in the density of states near the Fermi energy. We find that th…
Recent advances in biotechnology demonstrate that peptides and proteins are the basis of a new generation of drugs. However, the transportation of protein drugs in the body is limited by their high molecular weight, which prevents the crossing of tissue barriers, and by their short lifetime due to immuno response and…