Materials Literature
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We demonstrate novel methods for the study of multiple exciton generation from a single photon absorption event (carrier multiplication) in semiconductor nanocrystals (or nanocrystal quantum dots) that are complementary to our previously reported transient absorption method. By monitoring the time dependence of photol…
The diffraction image of a quasicrystal admits a finite group G as a symmetry group, and the quasicrystal can be regarded as a quasiperiodic packing of copies of a G-cluster C, joined by glue atoms. The physical space E containing C can be embedded into a higher-dimensional space R^k such that, up to an inflation fact…
In this article we present a method to compute the scattering states of holes in spherical bands in the strong spin-orbit coupling regime. More precisely, we calculate scattering phase shifts and amplitudes of holes induced by defects in a semiconductor crystal. We follow a previous work done on this topic by Ralph [H…
The thermodynamical stability of ${\rm Al(BH_4)_3}$ has been investigated using first-principles calculations based on density functional theory. The heats of formation are obtained to be -132 and $-131 {\rm kJ/mol}$ without the zero-point energy corrections for $α$- and $β$-${\rm Al(BH_4)_3}$, respectively, which are…
We investigate theoretically the effects of surface states over the magnetoresistance of Ni-based organic spin-valves. In particular we perform {\it ab initio} electronic transport calculations for a benzene-thiolate molecule chemically attached to a Ni [001] surface and contacted either by Te to another Ni [001] surf…
n -Butanol is an important industrial chemical usually produced by the oxo process, an expensive, energy-consuming set of reactions over metal catalysts, using petrochemical raw materials at high pressure. We developed nonstoichiometric hydroxyapatite (HAP), a highly active calcium phosphate compound and found it cata…
To cap it all: A polycation-free encapsulation method is used to obtain high concentrations of uncomplexed, short oligonucleotide chains confined within monodisperse, degradable microcapsules. Oligonucleotide loadings of >104 chains per capsule are obtained, and more than 90 % of the capsules are filled with DNA. Thes…
Graphene in the quantum Hall regime exhibits a multicomponent structure due to the electronic spin and chirality degrees of freedom. While the applied field breaks the spin symmetry explicitly, we show that the fate of the chirality SU(2) symmetry is more involved: The leading symmetry-breaking terms differ in origin…
Using a combination of an aqueous layer-by-layer deposition technique, nanoparticle surface modification chemistry, and nanoreactor chemistry, we constructed thin film coatings with two distinct layered functional regions: a reservoir for the loading and release of bactericidal chemicals and a nanoparticle surface cap…
We showed directional adhesion on the superhydrophobic wings of the butterfly . A droplet easily rolls off the surface of the wings along the radial outward (RO) direction of the central axis of the body, but is pinned tightly against the RO direction. Interestingly, these two distinct states can be tuned by controlli…
The spectral and fluorescent properties of (bis-θ,θ′-dimethylaminopolyenyl)diketones were studied. It was found that the presence of two carbonyl groups in the diketone structure leads to a bathochromic shift of the absorption spectrum of the dye with respect to that of the corresponding compound with one carbonyl gro…
The grain growth kinetics of nanocrystalline copper thin film samples was investigated. The grain size of nanocrystalline copper samples was determined from the broadening of X-ray spectra. It was found that the grain size increased linearly with isothermal annealing time within the first 10 minutes, beyond which powe…
In this study we have characterized the mechanical and electrical properties of Bi 2 Te 3 thin films prepared by co-sputtering method. The film structure and morphology were revealed using the X-ray diffraction and scanning electron microscopy (SEM). Thickness of the deposited films was measured using SEM observation…
A novel coating technique, thermal pressure filtration of sol-gel paints (TPFSP), has been developed to prepare nano-/micro-composite ceramic coatings with controllable thickness, structure, and excellent high temperature properties. In this paper, the fabrication of two typical coatings, nano-/micro- Al 2 O 3 - Y 2 O…
The production of Equids in Europe is oriented towards sports and races which constitute the main economic activity. However, the preservation of old draft breeds of local horse populations and the growth in the population of asses in recent years are emerging fields. The main reason for this situation is the very dee…
Abstract Photoemission electron microscopy is used to probe photon‐induced oxygen vacancies generated on TiO 2 (110)‐(1×2) surfaces. An increased oxygen vacancy concentration within the irradiated region leads to an increase of local photoelectron emission. The local oxygen deficient region can be compensated by expos…
Abstract For the fabrication of ZnO NWs, we have used Si wafers as smooth surface substrates. Gold was deposited on to the substrates with an electron beam evaporator, since it is known that gold particles can serve as the catalyst to grow ZnO NWs on substrates in Vapor‐Liquid‐Solid (VLS) method. In the VLS method, th…
Concentrated regenerated silk fibroin (RSF) aqueous solutions with concentration close to that of the native silk fibroin (15.5%, 25.5% and 31%) were prepared. The effect of storage time and concentration on the conformational transition of the concentrated RSF aqueous solution was studied by Raman spectroscopy and ci…
Abstract We have studied the phase transition of bipolarons in Ti 4 O 7 by means of Raman spectroscopy. It is found that on warming across the phase transition, the Raman spectrum shows distinct changes, i.e., broadening of the linewidths, decrease in the phonon frequencies, and appearance of the fine structure. These…
The electronic properties of ${\mathrm{Y}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}\mathrm{Ti}{\mathrm{O}}_{3}$ $(x<0.2)$ solid solution are described using the state-of-the-art $\mathrm{LDA}+\mathrm{DMFT}$ method. It is shown that both structural distortions and multiorbital electron interactions are key aspects toward…