Materials Literature
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Ähnlich wie beim Lotus-Effekt verleihen die mikro- und nanostrukturierten rauen Oberflächen einem Teflon-beschichteten maschigen Film superhydrophobe und superoleophile Eigenschaften. Man erhält einen variablen Film mit Kontaktwinkeln von etwa 150° für Wasser und nahezu 0° für Dieselöl. Deswegen sollte das System idea…
We have performed first-principles calculations of the electronic structure of ZnO, and applied them to the determination of structural and lattice-dynamical properties and their dependence on pressure. The dynamical matrices have been obtained for the wurtzite, zinc-blende, and rocksalt modifications with several lat…
Hollow nanofibers with walls made of inorganic/polymer composites or ceramics have been prepared by electrospinning two immiscible liquids through a coaxial, two-capillary spinneret, followed by selective removal of the cores. The capability and feasibility of this technique have been demonstrated by the fabrication o…
An example from nature: Analogous to the surface structure of the lotus leaf, the micro- and nanostructured rough surfaces of a teflon-coated mesh film engender it with both super-hydrophobic and super-oleophilic properties. The result is a variable film with contact angles of ≈150° for water and almost 0° for diesel…
We report high-resolution synchrotron X-ray scattering measurements on the structure and phase transitions of a single-crystal of Nd1/2Sr1/2MnO3. Detailed measurements of the peak intensity of the Bragg peaks as a function of temperature have allowed us to determine the onset temperatures and hysteresis associated wit…
The Gaussian chain in a quenched random potential (which is characterized by the disorder strength Delta) is investigated in the d-dimensional space by the replicated variational method. The general expression for the free energy within so-called one-step-replica symmetry breaking (1-RSB) scenario has been systematica…
The internal friction (Q−1), elastic modulus (E) and electrical resistance (R) of γ-MnFe based alloys were measured as the function of temperature. It was found that in the alloys with Mn-content (x) ranging from 0.4 to 0.6 in atomic fraction, the R–T curves turn up and there is no obvious anomaly in Q−1 and E curves,…
Magnetic and transport measurements have been performed on La0.7Sr0.3Mn1−xMxO3 (M = Cr, Ti) in order to study the influence of the substitution on the Mn-site on the magnetotransport properties in the La0.7Sr0.3MnO3 perovskite-like compound. Polycrystalline samples were prepared by a conventional solid-state reaction…
New conditions of synthesis Ca-chlorapatite and K-Ca-chlorapatite by using the melt salts method were determined. The results of X-ray diffraction show that the compound Ca-chlorapatite crystallizes in the hexagonal system (space group P63/m) with the crystallo-graphic parameters (a = b = 9.6228(3) Å and c = 6.7610(3)…
Abstract Rigid polyurethanes were synthesized using hydroxy alkylated cardanol formaldehyde and hydroxy alkylated dimerized‐cardanol formaldehyde resins and dicyclo hexyl methane diisocyanate. The studies on the aging (hydrolytic stability, absorption of water/toluene, chemical resistance, dimensional stability, and t…
Abstract Polyindole films prepared by potentiostatic growth in dichloromethane solution were subjected to overoxidation studies in aqueous media. Overoxidation at potentials greater than 1.1 V (vs. SCE) in 0.1 M KNO 3 or 0.1 M H 2 SO 4 was possible. Overoxidation in 0.1 M NaOH resulted in mechanically unstable films w…
Fluoropolymer composite films with nanoporous morphology and dielectric constants less than 2.0, consisting of plasma‐polymerized allylpentafluorobenzene (pp‐APFB) nanospheres and magnetron sputter‐deposited poly(tetrafluoroethylene) (s‐PTFE) dense layers, have been prepared on hydrogen‐terminated Si(100) (H‐Si) subst…
Trolox (synthetic, hydrosoluble phenolic derivative of vitamin E, used as an active in cosmetic products) can undergo photooxidation upon UVB and UVA irradiation, the main degradation intermediate being Trolox C quinone. Trolox photodegradation rate decreases with decreasing polarity of the solvent, most likely becaus…
We have studied the interaction of atomic hydrogen with (5,5) and (10,0) single-walled carbon nanotubes (SWNT) using density functional theory. These calculations use Gaussian orbitals and periodic boundary conditions. We compare results from the local spin density approximation, generalized gradient approximation (GG…
Abstract Summary: The effects of a reversible chemical reaction on morphology and dynamics of phase separating binary mixtures with viscosity difference are studied by numerically solving modified time‐dependent Ginzburg‐Landau and Navier‐Stokes equations. Much more interesting morphologies are observed in the system…
Abstract Summary: Monte Carlo simulation utilizing the bond fluctuation model in conjunction with single and configurational biased Monte Carlo moves is used to study the adsorption of diblock (A‐ block ‐B) and alternating (A‐ alt ‐B) copolymers at flat, chemically heterogeneous surfaces comprising C and D domains. Th…
A high activity and large capacity of hydrogen storage alloy Mg2Ni by hydriding combustion synthesis was investigated by means of pressure composition isotherms, X-ray diffraction and scanning electron microscopy. The results showed that the maximum hydrogen absorption capacity of Mg2Ni is 3.25 mass fraction at 523 K,…
Thermal oxidation of Fe 2+ in tourmalines of the schorl-dravite series induced by gradual annealing of powdered samples in air above 600°C was studied using X-ray diffraction and Mossbauer spectroscopy. The a unit-cell parameter distinctly decreases, while the c parameter even slightly increases during the oxidation a…
High-resolution x-ray photoelectron spectroscopy has been used to study the kinetics of the CO oxidation reaction on a Pt(111) surface in situ. The study focuses on the interaction of a preadsorbed p(2x2) layer of atomic oxygen with CO dosed using a supersonic molecular beam. Measurements of O 1s and C 1s spectra at 1…
Thin films of SmNiO3 were grown on LaAlO3 (012) substrates using the injection-MOCVD process, a method which has been in the past successfully applied to the growth of high-quality epitaxial oxide thin films. Our investigation of as-deposited films by X-ray diffraction allows concluding on the presence of a pure SmNiO…