Materials Literature
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X-ray diffraction data on liquids and disordered solids often provide useful complementary structural information to neutron diffraction data. Interpretation of the x-ray diffraction pattern, which is produced by scattering from the atomic electrons rather than from the atomic nuclei as in the case of neutron diffract…
A new approach to the reverse Monte Carlo analysis of total scattering data from polycrystalline materials is presented. The essential new feature is the incorporation of an explicit analysis of the Bragg peaks using a profile refinement, taking account of the instrument resolution function. Other new features includi…
PDFfit2 is a program as well as a library for real-space refinement of crystal structures. It is capable of fitting a theoretical three-dimensional (3D) structure to atomic pair distribution function data and is ideal for nanoscale investigations. The fit system accounts for lattice constants, atomic positions and ani…
New Aurivillius phases in the Bi–Ag–Ti–O system were investigated by means of a solid‐state reaction and X‐ray diffraction. We found that the oxygen partial pressure has a significant influence on the synthesis of the Aurivillius phases. The mixed‐layer Aurivillius phase Ag 0.5 Bi 8.5 Ti 7 O 27 was observed after firi…
Abstract Blend of ethylene‐vinyl acetate copolymer (EVA), ethylene‐propylene‐diene terpolymer rubber (EPDM), and chlorinated polyethylene (CPE) filled with talc was cross‐linked with dicumyl peroxide and blown simultaneously with azodicarbonamide for preparation of high elasticity material by injecting, cross‐linking,…
The unsymmetrical pi donor dimethyl(ethylenedioxy)tetraselenafulvalene (DMEDO-TSeF) has provided six new organic superconductors with a monovalent square-planar [Au(CN)(4)](-) ion and cyclic ethers as solvent of crystallization. The six new organic superconductors kappa-(DMEDO-TSeF)(2)[Au(CN)(4)](solv.) [solv.=1,3-dio…
Abstract A comprehensive study of the structure and properties has been performed for copolymers of propylene‐1‐hexene, CiPH, and propylene‐ethylene, CiPE, synthesized by an isotactic metallocene catalyst system. The comonomer content constitutes the most important factor affecting the structure and properties of thes…
Abstract The random end linking of different amounts of trifunctional crosslinkers with 3 000 prepolymer linear chains, with length varying from 10 to 30 monomers, to form networks at different system number densities was dynamically simulated by the molecular dynamics method. Investigation of the crosslinking kinetic…
Abstract A family of erbium alkoxides [Er(OR) 3 ] was prepared from the reaction of Er[N(SiMe 3 ) 2 ] 3 with a series of alcohols (HOR) in selected solvents and crystallographically characterized as: [Er(μ‐Onep) 2 (Onep)] 4 , ( 1 ), [Er 4 (μ 4 ‐O)(μ 3 ‐Onep)(μ‐Onep) 5 (Onep) 4 (py) 3 ] ( 3 ), Er 3 (μ 3 ‐O t Bu) 2 (μ‐O…
Abstract Linear isotactic metallocene based polypropylene ( M w = 125,000 g/mol, M n = 61,000 g/mol) was lightly crosslinked by small amounts of 1,3‐benzenedisulfonyl azide to form long chain branches (LCB). Crosslinking was carried out by reactive extrusion at 200°C in a small scale extruder. At the processing temper…
Eingefangen: Die Selbstorganisation von Bakterien gelang durch Kombination von Escherichia coli mit dem synthetischen Zeolith L. Der Organisationsprozess lässt sich so steuern, dass die Gebilde Bakterien und poröse Nanobehälter im Verhältnis 1:1 oder 2:1 enthalten (siehe schematische Darstellung).
Abstract We propose simple expressions $\Pi /\Pi _0 = 1 + (\varphi /\varphi _{{\rm ex}} )^{3\alpha - 1}$ and $(\delta _0 /\delta )^2 = 1 + (\varphi /\varphi _{{\rm ex}} )^{2\alpha }$ for the osmotic pressure Π and the depletion thickness δ as a function of the polymer concentration φ . Here, Π 0 and δ 0 correspond to…
Two unusual mixed-valent {MnIII6MnII} bitetrahedra display frustrated magnetic exchange, leading to S = 13/2 +/- 1 and 11/2 +/- 1 ground states and slow magnetization relaxation.
3,4-Dicyanophenyl O- and S-glycosides in the gluco, galacto, lacto, and cellobiose series were prepared in virtually quantitative yield through nucleophilic aromatic substitution of 4-nitrophthalonitrile with acetyl-protected glycoses and 1-thio-glycoses. Similarly, 2-(3,4-dicyanophenoxy)ethyl 2,3,4,6-tetra-O-acetyl-β…
An algebraic method to calculate the optical constants for a weakly absorbing thin film from the spectrum of normal reflectance is described. The calculation of the refractive index of the thin film is simplified by constructing a midpoint envelope through the reflection spectrum. If a portion of the spectrum includes…
Nanocrystalline tin and indium oxides (In 2 O 3 /SnO 2 ) were synthesized in sub‐ and supercritical water at 350°/380°C and 30 MPa in <73 s in a tubular flow reactor from an aqueous solution of {SnCl 4 +InCl 3 } (0.2 M ). The conversion rate for tin was 100%. Nanoparticles were analyzed by transmission electron mic…
Abstract Polyamide/organophilic montmorillonite nanocomposites were prepared from two silicates with different organophilization resulting in strong and weak matrix/silicate adhesion, respectively; uncoated sodium montmorillonite was used as reference. The silicate content of the composites changed between 0 and 10 vo…
Abstract The photo‐oxidative degradation of the blends of polypropylene (PP) with metallocene linear low density polyethylene (mLLDPE) were studied. The blend samples were exposed to the ultraviolet radiation (UV) for a period of 6 weeks. Tensile mechanical characteristics were derived from stress–strain curves. The c…
Ultrasonic spray pyrolysis (USP) has been used to prepare carbon spheres from aqueous solutions of substituted alkali benzoate salts. The size of the carbon spheres produced during USP can easily be controlled simply by changing the concentration of the precursor solution. Both the cation and the ring substituents of…
Abstract We present results on resonant Raman scattering in single crystal ZnO using a continuously tuneable excitation in the energy region of the free and bound excitons. The PL and Raman spectra show the presence of a dominant luminescence band at 3.310 eV as well as the A 1 (TO), E 2 (high), E 1 (LO), and 2E 1 (LO…