Materials Literature
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Abstract A Raman spectroscopic study on the organo‐montmorillonites prepared at different concentrations provided detailed observations about the ordering conformation of HDTMA + ions confined within the montmorillonite interlayer. The ordering conformation shows a strong dependence on the concentration of the confine…
Abstract Water‐soluble poly(ester‐carbonate) having pendent amino and carboxylic groups on the main‐chain carbon is reported for the first time. This article describes the melt ring‐opening/condensation reaction of trans ‐4‐hydroxy‐ N ‐benzyloxycarbonyl‐ L ‐proline ( N ‐CBz‐Hpr) with 5‐methyl‐5‐benzyloxycarbonyl‐1,3‐d…
Spherical Co and ZrO 2 particles in the size range of 11−16 nm, exhibiting at room temperature metastable phases, fcc for cobalt and tetragonal for zirconia, were synthesized, by the reaction under autogenic pressure at elevated temperature (RAPET) technique. The tetragonal phase in ZrO 2 was obtained without doping t…
Here we present results of accurate wet-chemical redox analyses revealing that the oxidation number of cobalt in the newly discovered CoO 2 -layer superconductor, Na x CoO 2 · y H 2 O ( x ≈ 0.36, y ≈ 1.3) is ∼3.46. This value is significantly lower than the one (∼3.64) expected on the basis of the value determined for…
Tim9 and Tim10 are essential components of the "small Tim" family of proteins that facilitate insertion of polytopic proteins at the inner mitochondrial membrane. The small Tims are themselves imported from the cytosol and are organized in specific translocation assemblies in the intermembrane space. Their conformatio…
This letter presents a novel reflecto-directive system using a composite right/left-handed (CRLH) leaky-wave (LW) antenna and heterodyne mixing. The system receives a signal at a fixed frequency with a patch antenna and reflects it back toward any desired angle by tuning the LO frequency of a mixer. The performances o…
Unprecedented fused acceptor-donor-acceptor triad (Q-TTF-Q) incorporating the donor tetrathiafulvalene (TTF) and the acceptor p-benzoquinone (Q) has been synthesized. The solution UV-Vis spectrum displays a low energy absorption band which is attributed to an intramolecular charge transfer between both antagonistic un…
Nanostructure diamond (NSD) film with a hardness as high as 70 GPa and an average surface roughness of 10 nm has been synthesized by the two-step negative substrate bias method combined with post-growth Ar-H 2 plasma irradiation. The Ar-H 2 plasma irradiation has been confirmed to improve the uniformity of grain size…
Physical properties of an organic conductor, β'-(BEDT-TTF) 2 IBrCl, were characterized under ambient and extremely high pressures. Semiconducting behavior with activation energy, E a =0.11eV, and antiferromagnetic transition with T N =19.5K were uncovered in the present work. In addition, we have found that this salt…
X-ray absorption measurements and large-scale molecular dynamics simulations are used to investigate the storage capacity of hydrogen in cluster-assembled carbon films. Experimental results show that nanostructured carbon exposed to H 2 at 0.12 MPa for 3 h at room temperature can store up to 1.5 wt % of hydrogen. Thes…
Kurzfassung Mit zunehmender Verschmutzung der Schmierstoffe nimmt die Lebensdauer von Wälzlagern ab. Die im Schmierstoff befindlichen Partikel führen in der Wälzkontaktzone zu einer lokalen Überhöhung der Flächenpressung, in deren Folge Anrisse und Pittingbildung auftreten können. Die Anrissempfindlichkeit von Kugella…
In the present study, two new methods are proposed for the polishing of silicon wafers using ultrafine-dispersed diamonds (UDDs). The first proposed polishing method uses a polishing tool with an ultrafine abrasive material made through the electrophoretic deposition of UDDs onto a brass rod. Dry polishing tests showe…
The specific features of the stabilization of suspensions formed by detonation nanodiamonds in polar and nonpolar media are investigated. It is demonstrated that the polydispersity of nanodiamond particles in an aqueous medium periodically changes in an ultrasonic field. The conditions are determined under which the o…
The review gives exhaustive coverage over the period 1876 to 2002 of the syntheses and physical and chemical properties of gem-dithiols. gem-Dithiols, poorly understood until recently, are organic sulfur compounds that contain a >C(SH)2 group.
The effects of monomer and tetrabuthylammonium hexafluorophosphate concentration on the nucleation and growth processes of polyfuran on Pt disc electrode in CH3CN have been studied through the step potential method. The j/t transients were fitted by means of a mathematical equation that considers different contributio…
NrdH-redoxins constitute a family of small redox proteins, which contain a conserved CXXC sequence motif, and are characterized by a glutaredoxin-like amino acid sequence but a thioredoxin-like activity profile. Here we report the structure of Corynebacterium ammoniagenes NrdH at 2.7 A resolution, determined by molecu…
Recent investigations on a phosphatized sediment sequence in the Cioclovina Cave led to the identification of a second occurrence in Romania (first time in the cave environment) of variscite, AlPO4·2H2O. The mineral exists as dull-white, tiny crusts and veinlets within the thick argillaceous material accumulated on th…
The dicyanamide anion, [N(CN) 2 ] - (hereafter abbreviated dca), has been shown to be a versatile building block for the assembly of coordination polymers which are components of molecular superconductors, magnets and conducting/magnetic hybrid materials. Significantly different anion topologies have been observed. We…
We propose a new optical method and the experimental set-up for measuring the anisotropic shear viscosities of nematic liquid crystals (LCs). LC shear viscosities can be optimized to improve liquid crystal display (LCD) response times, e.g. in vertical aligned nematic (VAN) or bistable nematic displays (BND). In this…
Self‐propagating high‐temperature synthesis (SHS) was applied to synthesize α‐SiAlON powders doped by RE (RE = Eu,Pr,Ce) and codoped by RE and yttrium. The results showed that the weight ratio of α‐SiAlON to (α‐SiAlON +β‐SiAlON) decreased from 70%, 55%, and 25% for europium‐, praseodymium‐, and cerium‐doped α‐SiAlON c…