Materials Literature
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All articles of this category The development of porphyrins functionalized by the CH 2 PPh 3 Cl moiety has enabled a range of new porphyrins to be conveniently prepared. This is best demonstrated by their utility in the preparation of building blocks for large porphyrin arrays. Examples, of the utility of these phosph…
Previous studies and the crystal structure of Anabaena PCC 7119 FNR suggest that the side chains of Arg100 and Arg264 may be directly involved in the proper NADP+/NADPH orientation for an efficient electron-transfer reaction. Protein engineering on Arg100 and Arg264 from Anabaena PCC 7119 FNR has been carried out to i…
: Electron beam X-ray microanalysis with semiconductor energy-dispersive spectrometry (EDS) performed with standards and calculated matrix corrections can yield quantitative results with a distribution such that 95% of analyses fall within +/-5% relative for major and minor constituents. Standardless methods substitut…
We study the possibility of using hydrogen-bonding interactions to promote the stabilisation of phase biaxiality in nematic binary mixtures of oblate and prolate thermotropic mesogens. We extend Onsager's theory of the isotropic-nematic transition to allow for such selective associations among unlike species and we us…
Abstract The crystal structure of chloromenite, Cu 9 O 2 (SeO 3 ) 4 Cl 6 , a = 14.170(3) Å, b = 6.262(1) Å, c = 12.999(3) Å, β = 113.05(1)°, V = 1061.3(4) Å 3 , Z = 2, space group I 2/ m , has been solved by direct methods and refined to an R ( F ) index of 0.051 ( wR ( F 2 ) = 0.128). The structure is based on unbran…
Terminal-functionalized polyesters were synthesized by enzymatic ring-opening polymerization of lactones in the presence of a functional alcohol. The alcohol initiated the ring-opening polymerization of lactones using Candida antarctica lipase as catalyst to introduce the alcohol moiety at the polymer terminal (“initi…
Other| December 01, 1998 Study of the Al coordination in mullites with varying Al:Si ratio by 27 Al NMR spectroscopy and X-ray diffraction P. Rehak; P. Rehak Friedrich-Schiller-Universitaet Jena, Jena, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar G. Kunath-Fandrei; G. Kunath…
Adsorption processes in layer-by-layer films are discussed using poly(o-methoxyaniline) (POMA) as a case study and also comparing with results for other polymers from the literature. This follows a brief overview of the materials and characterization techniques employed for self-assembled films, including their possib…
Temperature dependence of Fe K-edge x-ray-absorption fine-structure spectra of a chain Fe(II) complex ${[\mathrm{Fe}(4\ensuremath{-}\mathrm{a}\mathrm{m}\mathrm{i}\mathrm{n}\mathrm{o}\ensuremath{-}1,2,4\ensuremath{-}\mathrm{t}\mathrm{r}\mathrm{i}\mathrm{a}\mathrm{z}\mathrm{o}\mathrm{l}\mathrm{e})}_{3}{](\mathrm{C}\math…
Pure titanium shows very interesting characteristics such as high strength-to-weight ratio, very good corrosion resistance and excellent biocompatibility, which make this material appropriate for use in orthopedic and dental implants. Due to the mechanical properties of pure titanium, its use in implants is restricted…
The mechanism of cathodic disbonding of three-layer polyethylene (PE)-coated steel pipe composed of liquid epoxy primer, adhesive PE, and a PE protective layer at an elevated temperature was investigated in sodium chloride (NaCl) solution. Cathodic disbonding tests were carried out to determine the route by which the…
A computer simulation study of the phase behavior of the dipolar Gay–Berne liquid crystal model is presented. The phase transitions are determined with isothermal–isobaric (NPT) Monte Carlo simulations, utilizing the reaction field method. The electrostatic forces are found to have a considerable effect on the nature…
Polyester based polyurethanes were synthesized from low molecular weight polyester (Mn 2000) and 4,4′-methylene bis(phenyl isocyanate) (MDI) with butanediol as a chain extender and glycerol as a crosslinker. The polyester was synthesized from adipic acid and glycol which was a mixture of 1,6-hexanediol and 1,2-propane…
Abstract A radially vibrating horn is studied as a possible system for scaling up sonochemical reactors. The anisotropic behavior of this horn was demonstrated, as were strong correlations among the acoustic field, the acoustic streaming, and the sonochemical reactivity. A comparison with the classic laboratory horn e…
Epitaxial films of La0.7Ca0.3MnO3 have been irradiated with 90 MeV oxygen ions at different dose values ranging from 1011–1014 ions/cm2. The structural, magnetization, and magnetotransport properties have been studied as a function of the ion dose. It is found that the properties change gradually up to a dose of 1013…
Highly oriented thin film In 2 O 3 was heteroepitaxially grown on an optically polished (001) plane of single crystalline yttria stabilized zirconia (YSZ) substrate using molecular beam epitaxy (MBE). The full-width at half maximum (FWHM) of the X-ray rocking curve was 0.08° for 200-nm-thick In 2 O 3 layers indicating…
Incorporation of emission properties into organic liquid crystals (LCs) is currently an active area of research. The authors present the first example of a functional phasmidic LC with intrinsic luminescence properties. It is shown that organization in the solid state—the Figure indicates the average ordering of hexac…
The miscibility of blends of poly(vinyl alcohol) (PVA) with chitin-graft-poly(2-ethyl-2-oxazoline) (1) and poly(2-ethyl-2-oxazoline) homopolymer (PEtOZO) was investigated. Calorimetric results showed a single glass transition temperature (Tg) in the entire range of compositions for both blend systems, which indicated…
Abstract The durability of high‐density polyethylene (HDPE)/ paraffin blends as a thermal energy storage material was studied by investigation of the seepage behavior of paraffin. The HDPE in the blends serves to prevent paraffin seepage during repeated heating‐cooling cycles; i.e., the HDPE acts as a sealant material…
This work describes the synthesis and properties of a material with unusual photophysical behavior. The material, a gel, is made by interaction of (3-aminopropyl)triethoxysilane with a carboxylic acid under oxygen- and water-free conditions through a sol−gel process, and it emits different colors by excitation at diff…