Materials Literature
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Cellulose carbamate and ester derivatives were synthesized in homogeneous solutions of lithium chloride (LiCl)/N,N-dimemyl-acetamide (DMAc) by the reaction of cellulose with ethyl 4-isocyanatobenzoate and the activated esters of N,N-dimethyl-aminobenzoic acids. Comparative reactions were performed with phenyl isocyana…
The inhibiting effect of Schiff base N,N´-o-phenylen-bis (3-methoxysalicylaldenimine), designated as V-ph-V, on corrosion of copper in 1.0 M hydrochloric acid (HCl) or 1.0 M sodium chloride (NaCl) solutions under various conditions was studied using the potentiostatic polarization method and the alternating current (A…
BaTiO 3 particles of ultrafine size and high crystallinity were produced by a spray−coprecipitation technique. To improve stability, titanium isopropoxide was acylated using acetic acid. The sol solutions were prepared by mixing the titanium acylate with aqueous barium acetate . Spray−precipitation was performed in co…
The high-order harmonics of temperature wave were detected in a thin film by inputting a square pulse train with a variable duty factor to generate temperature modulation. In Fourier analysis, the harmonics were observed up to the 42 th order and the mathematical rule was experimentally confirmed. This principle was a…
In this article, electron beam induced changes in the refractive index and film thickness of time relaxed amorphous AsxS100−x (with x=30–45) and AsxSe100−x (with x=40–70) are studied. The largest index change (∼0.08) in AsxS100−x films is found when x=40. The corresponding value (∼0.06) for AsxSe100−x films is met whe…
Six styrene derivatives meta-substituted with acetal-protected glucofuranoses ( 1 ) and ( 2 ), galactopyranose ( 3 ), fructopyranose ( 4 ), and sorbofuranose ( 5 ) and para-substituted with acetal-protected glucofuranose ( 6 ) were synthesized by the Williamson reactions of m - or p -(chloromethyl)styrene with the cor…
The structural characterization of syndiotactic copolymers of propene with 1-butene, prepared with a single-center metallocene-based catalyst, is reported. The copolymers are crystalline in a whole range of comonomer composition. The increase of a and b axes of the unit cell from the values of syndiotactic polypropyle…
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…