Materials Literature
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The authors investigated the ferroelectric properties of strontium titanate (STO) thin films deposited on SrTiO3 (001) substrates with SrRuO3 electrodes. The STO layer was grown coherently on the SrTiO3 substrate without in-plane lattice relaxation, but its out-of-plane lattice constant increased with a decrease in th…
An extensive theoretical study is performed for wide bandgap crystalline oxides and nitrides, namely, SiO_{2}, GeO_{2}, Al_{2}O_{3}, Si_{3}N_{4}, and Ge_{3}N_{4}. Their important polymorphs are considered which are for SiO_{2}: $α$-quartz, $α$- and $β$-cristobalite and stishovite, for GeO_{2}: $α$-quartz, and rutile,…
We report on the magnetodielectric properties of well-ordered epitaxial La2CoMnO6 films. The temperature dependence of the dielectric constant is measured in the 10–105Hz frequency range under applied magnetic fields up to 50kOe. As temperature is lowered, the dielectric constant decreases in the ferromagnetic regime…
A new organogelator based on a salicylideneaniline derivative with cholesterol moieties was synthesized, and it was proposed that it could gelate various organic solvents, such as 1-butanol, 1-octanol, butyl acetate, tetrachloromethane, benzene, toluene through combination with a gelation test. From the results of ana…
The large saturation magnetization in conventional dense moment ferromagnets offers flexible means of manipulating the ordered state through demagnetizing shape anisotropy fields but these dipolar fields, in turn, limit the integrability of magnetic elements in information storage devices. We show that in a (Ga,Mn)As…
In the present work we discuss based on extensive fully atomistic molecular dynamics simulations the dynamics of Neon atoms oscillating inside (5,5)single-walled carbon nanotubes (CNTs) and boron-nitride (BNNT) ones. Our results show that sustained high frequency oscillatory regimes are possible for a large range of t…
A general formalism of X-ray scattering from different kinds of surface morphologies is described. Based on a description of the surface morphology at the atomic scale through the use of the paracrystal model and discrete distributions of distances, the scattered intensity by non-periodic surfaces is calculated over t…
Flamme und Fluoreszenz: Wasserlösliche, vielfarbig fluoreszierende Kohlenstoffnanopartikel entstehen, wenn Kerzenruß mit Salpetersäure unter Rückfluss erhitzt wird (siehe Bild). Die Ausgangsmaterialien sind einfach zugänglich und billig.
Photopolymerizable and degradable biomaterials are finding widespread application in the field of tissue engineering for the engineering of tissues such as bone, cartilage, and liver. The spatial and temporal control afforded by photoinitiated polymerizations has allowed for the development of injectable materials tha…
Flame and fluorescence: Water-soluble, multicolor fluorescent carbon nanoparticles are prepared by refluxing candle soot with nitric acid (see picture). The starting materials are easily accessible and inexpensive.
Skin surface acidity can be measured according to two criteria, its value given by pH and its strength determined by the ability of the skin to resist an acidic/alkaline aggression (i.e. acidic/alkaline resistance and neutralization tests). It is the quantitative extent to which the skin resists these changes that def…
Networks or webs of domain walls are admitted in Abelian or non-Abelian gauge theory coupled to fundamental Higgs fields with complex masses. We examine the dynamics of the domain wall loops by using the moduli approximation and find a phase rotation induces a repulsive force which can be understood as a Noether charg…
The morphology of growing Pd nano-particles on MgO(001) surfaces have been investigated in situ, during growth, by grazing incidence small angle x-ray scattering, for different substrate temperatures. The 2D patterns obtained are quantitatively analyzed, and the average morphological parameters (shape, size) deduced.…
The self-organized growth of Co nanoparticles with 10 nm periodicity was achieved at room temperature on a Ag(001) surface patterned by an underlying dislocation network, as shown by real time, in situ Grazing Incidence Small and Wide Angle X-ray Scattering. The misfit dislocation network, buried at the interface betw…
Semiconductor Bloch equations, which microscopically describe the dynamics of a Coulomb interacting, spin-unpolarized electron-hole plasma, can be solved in two limits: the coherent and the quasi-equilibrium regime. These equations have been recently extended to include the spin degree of freedom, and used to explain…
Many attempts to obtain single crystals appropriate for X-ray diffraction analysis of the Ln(tpp)(acac) derivatives (where Ln = Gd or Sm, tpp = tetraphenylporphyrin and acac = acetylacetonate) have failed so far. A suitable way to get structural parameters for these monoporphyrinates is to use extended X-ray absorptio…
Three Re(I) complexes (3, 5, and 7) (Re(CO)3Cl(L)2) and three new Pt(II) complexes (4, 6, and 8) ([Pt(P(Et)3)2(L)2](OTf)2), where L = pyridine, 1 (4-Py-EDOT) or 2 (4-Py-bithiophene), were prepared and characterized. The solid-state structures of 4 and 5 were determined by X-ray crystallography. Electrochromic polymeri…
The first examples of novel bowl-shaped tribenzotriquinacenes (TBTQs) bearing three dithiametacyclophane units within their arene peripheries are reported. The synthesis is based on a C3v-symmetrical hexakis(chloromethyl)tribenzotriquinacene as the key intermediate and yields the inter-ring metacyclophane-type macrocy…
Abstract Magnetic iron oxide nanoparticles coated with mesoporous silica involving single-site titanium oxide moiety have been first developed by adopting a two-step coating method. The catalytic performance and magnetically separable ability were demonstrated in the oxidation of 2,6-di-tert-butylphenol using hydrogen…
High Resolution Image Download MS PowerPoint Slide Temperature dependence of the electric resistance was measured in the temperature range between 5 and 290 K for the assembly of the boron-doped multiwalled carbon nanotubes (B-doped MWNTs). The observed temperature dependence was explained by the mechanism of three-di…