Materials Literature
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One of the defining characteristics of the twist-bend nematic phase, formed by the methylene-linked liquid crystal dimer 1″,7″-bis(4-cyanobiphenyl-4'-yl) heptane (CB7CB), is its chirality. This new nematic phase, predicted by Dozov, is of particular interest because although the constituent molecules are achiral the p…
Excitonic contributions to absorption and photocurrent generation in semiconductor nanostructures are described theoretically and simulated numerically using steady-state non-equilibrium Green's function theory. In a first approach, the coherent interband polarization including Coulomb corrections is determined from a…
Structural properties of the clean Si(001) surface obtained as a result of low-temperature (470--650C) pre-growth annealings of silicon wafers in a molecular-beam epitaxy chamber have been investigated. To decrease the cleaning temperature, a silicon surface was hydrogenated in the process of a preliminary chemical tr…
We prove that the two-dimensional Schroedinger operator with a potential having the symmetry of a honeycomb structure has dispersion surfaces with conical singularities (Dirac points) at the vertices of its Brillouin zone. No assumptions are made on the size of the potential. We then prove the robustness of such conic…
The nearly well-ordered double perovskite La${}_{2}$CrFeO${}_{6}$ has been synthesized recently. Contrary to previous theoretical predictions, but in agreement with experimental observations, our first principle calculations indicate an insulating ferrimagnet La${}_{2}$CrFeO${}_{6}$ with antialigned $S=3/2$ Cr${}^{3+}…
In two series of measurements, Cardone, Carpinteri et al. report an excess of neutrons over the background flux corresponding to the catastrophic fracture of a granite block subject to compression. Here we show that these measurements contain large inconsistencies with respect to the stated experimental procedure, inc…
The hysteresis effect is a common problem in graphene field-effect transistors (FETs). Usually, the external doping to graphene is considered to be responsible for the hysteresis behavior, but is not yet clearly understood. By monitoring the doping of graphene and the hysteresis in graphene FETs under different atmosp…
In this paper, we report a simple and an inexpensive method for fabricating superhydrophobic/superoleophilic mesh films from microstructured ZnO coatings. The microstructured ZnO coatings, which do not contain any fluorinated compounds, maintain their superhydrophobicity and superoleophilicity after ultraviolet irradi…
Zwitterionic oligopeptide liposomes (HHG2C(18)-L) containing a smart lipid (1,5-dioctadecyl-L-glutamyl 2-histidyl-hexahydrobenzoic acid, HHG2C(18)) are developed to overcome the barriers faced by anticancer drugs on the route from the site of injection into the body to the final antitumor target within transport steps…
Regenerated cellulose (RC) films coated with copper (Cu) nanoparticles were prepared from cellulose-cuprammonium solution through coagulation in aq. NaOH and subsequent reduction in aq. NaBH4. Structure and morphology of the nanocomposite films were characterized with X-ray diffraction (XRD), X-ray photoelectron spect…
The sulfur-bridged dimers [{Cp'(2)Ln(μ-SSiPh(3))}(2)] (Ln=Gd (1), Dy (2); Cp'=η(5)-C(5)H(4)Me) were synthesized by the transmetalation reactions between [Cp'(3)Ln] and Ph(3)SiSLi. Compound 2 is a single-molecule magnet with slow relaxation of magnetization up to 40 K and an anisotropy barrier of U(eff) =133 cm(-1). In…
Abstract Organic fluorescent materials have been an integral part of recently emerged optoelectronic device technologies owing to their good photophysical properties such as high quantum yields and significant photostability. In particular, switchable and tunable solid‐state fluorescence has attracted increasing atten…
Layer-by-layer gold nanoparticles are used to generate photocurrent in an environmentally-friendly plasmon-sensitized solar cell towing to surface plasmon resonance. The efficiency of the photoelectric conversion of gold nanoparticle layers is increased as the intensity of surface plasmon resonance increases. We also…
We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator ${\mathrm{Cu}}_{2}\mathrm{O}{\mathrm{SeO}}_{3}$. The magnetic phase diagram associated with the helimagnetic modulation inferred from small-angle neutron scattering and magnetization measurements includes a skyrmion…
Room-temperature, bottom-gate, field-effect transistor characteristics of 2D ultrathin layer GaS and GaSe prepared from the bulk crystals using a micromechanical cleavage technique are reported. The transistors based on active GaS and GaSe ultrathin layers demonstrate typical n-and p-type conductance transistor operat…
La filière silicium polycristallin en couches minces suscite un intérêt majeur dans l’industrie photovoltaïque. En effet, elle constitue une alternative très prometteuse à la filière silicium monocristallin puisqu’elle permet une réduction du coût matière. Théoriquement, pour un matériau monocristallin, les perfermanc…
Hydrogen storage tanks based on complex hydrides (CxH) e.g. NaAlH4, usually show unsatisfactory tank dynamics due to poor intrinsic kinetics of the storage material. In general, high temperatures are necessary for the absorption process in order to overcome these kinetic limitations. \nWith the approach presented in t…
Article
A common approach to calculate the electrostatic potential in a colloidal crystal is to assume that the neighbor distribution around each colloid is isotropic. In this thesis a numerical model is discussed that keeps the explicit non-isotropic neighbor distribution intact while calculating the electrostatic potential…
Le développement de nouveaux matériaux est essentiel dans la réalisation de capteurs de petites dimensions et pour les composants micro-nano-optoélectroniques. Les matériaux à base d'oxydes en sont de bons candidats. Ce travail de thèse a concerné la synthèse de matériaux ferroélectriques tels le BaTiO3 (BTO) et le Ba…