Materials Literature
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The tricatenar, hydrogen-bonded complexes formed between alkoxystilbazoles and an imine were found to be mesomorphic. Subsequently, related tetracatenar complexes were also investigated and found to be non-mesomorphic. We report the transition temperatures of these complexes and discuss structural modifications.
MnBi crystallizes in a NiAs-type hexagonal crystal structure, exhibits a high uniaxial anisotropy, and is potentially useful as a permanent magnet material. We have examined the effect of partial substitution of Bi with rare earth elements on the magnetic properties of MnBi. MnBi1−xRx (R=Nd, Dy) were prepared by mecha…
We present the results of a Molecular Dynamics computer simulation of a binary Lennard-Jones liquid confined in a narrow pore. The surface of the pore has an amorphous structure similar to that of the confined liquid. We find that the static properties of the liquid are not affected by the confinement, while the dynam…
A finite element method was used to simulate domain wall pinning in SmCo5/Sm2Co17 based permanent magnets. The finite element model was built according to the cellular microstructure obtained from transmission electron microscopy investigations. The numerical results show a strong influence of the dimension of the cel…
We report the synthesis, X-ray diffraction results and electro-optical switching measurements for a bent-shaped mesogen having two non-mesogenic units linked by an alkylene spacer. The novelty of the molecular structure lies in the carbonyl group of the ester linkage being directly attached to the spacer unit, unlike…
The corrosion of steels and of nickel-based alloys was studied in exposure experiments at 600 °C beneath a molten CaSO4-K2SO4-Na2SO4-PbSO4-ZnSO4 sulphate mixture in N2-5 vol.% O2 with and without additions of 1000 vppm HCl, 1000 vppm SO2 and 1000 vppm HCl in combination with 250 vppm SO2. In the N2-5 vol.% O2 atmosphe…
Epitaxial thin films of La0.62±0.05Ca0.33±0.02MnO3−δ were grown by laser ablation on SrTiO3. On (100) substrates the films grow with the larger c axis perpendicular to the plane. The films deposited on (110) SrTiO3 grow with both the c (long) axis and a (or b, short) axis in the plane of the film. The electrical resis…
Abstract Zenithal Bistable display devices have been made which are compatible in size and functionality with current mobile phone or pager displays. Radical improvements in the viewing characteristics particularly in reflective mode are shown. Furthermore this paper describes: low voltage operation; fast latching tim…
In this study, the configuration of a reflective bistable-twisted-nematic (BTN) liquid-crystal cell is optimized for high contrast and high brightness operation. We searched for the optimum optical parameters of a reflective BTN cell by calculating its optical performances at three wavelengths; red, green, and blue. B…
Chemical vapor deposition silicon carbide films are considered as a perspective hard mask and stop layer in advanced dry etch technology because of the high chemical and plasma stability. However the a-SiC:H film should be etched away after technological use. In this case the high chemical stability of the a-SiC:H fil…
The complex salts CdL 4 (O 3 SCF 3 ) 2 (L = 2(1H)-pyridinethione (Py2SH), 4(1H)-pyridinethione (Py4SH), or 2(1H)-quinolinethione (Q2SH)) have been synthesized by the stoichiometric reaction of Cd(O 3 SCF 3 ) 2 and the appropriate thione. Both ambient-temperature 13 C and reduced-temperature 111 Cd NMR of CdL 4 (O 3 SC…
Abstract Vulcanized natural rubber was pulverized using a single screw extruder in a non-cryogenic Solid State Shear Extrusion (SSSE) process where rubber granulates were subjected to high compressive and shear stresses. The produced particles had diameters ranging from 40 to 1700 µm. Reprocessing of the produced powd…
The zirconium and hafnium imido metalloporphyrin complexes (TTP)M = NArtPr (TTP = meso-5,10,15,20-tetra-p-tolylporphyrinato dianion; M = Zr (1), Hf; AriPr = 2,6-diisopropylphenyl) were used to mediate addition reactions of carbonyl species and metathesis of nitroso compounds. The imido complexes react in a stepwise ma…
Two homologous series, 4'-(4-n-alkoxybenzoyloxy)-4-substituted 3-nitrotolans (Ia-d) and 4'-(4-n-alkoxybenzoyloxy)-4-substituted tolans (IIa-c), with substituents (S)-2-methyl-1-butyl and n-alkyl, were synthesized by Sonogashira's coupling. Their mesomorphic behaviour is reported. The thermal stability of the series II…
We report in-plane anisotropy in epitaxial Sm–Co(x)/Fe(y) bilayers as determined by ferromagnetic resonance (FMR). Four samples, (x,y)=(35,30) and (20, 20) nm each on MgO (110) and (100) substrates, have been prepared via magnetron sputtering. The two substrate orientations result in twofold and fourfold Sm–Co symmetr…
Cation-cation complexes of NpO 2 + and PuO 2 + with UO 2 2+ and Th 4+ were studied using laser-induced photoacoustic spectroscopy (LIPAS). An equilibrium constant of 2.4±0.2 M -1 was measured at an ionic strength of 6.0 M for the NpO 2 + · UO 2 2+ complex which is in good agreement with previous measurements using con…
We report a muon spin relaxation $(\ensuremath{\mu}\mathrm{SR})$ investigation of the organic spin-Peierls compound $\mathrm{MEM}(\mathrm{TCNQ}{)}_{2}$ at temperatures down to 39 mK. We have observed a slowing down of the electronic spins as the spin-Peierls gap widens at temperatures below the spin-Peierls transition…
Diamond-like carbon (DLC) coatings were deposited using a commercial direct ion beam deposition technique on thin-film Al2O3–TiC inductive write heads. The coating thicknesses used were 5, 10, and 20 nm. Accelerated wear tests were conducted with metal particle tapes in a linear tape drive. Atomic force microscopy was…
Abstract An ultrathin palladium film on a porous TiO 2 ceramic membrane was successfully synthesized by a novel photocatalytic deposition (PCD) method. The mechanism was interpreted by the photocatalytic reaction between the surface of the TiO 2 semiconductor and the Pd(II) solution. Energy dispersive (EDS) analysis a…
A bioreactor system operating in a continuous mode was designed to generate biofilms on polished and as-received surfaces of AISI 316 stainless steel coupons exposed for 36 d to a pure culture of marine Pseudomonas NCIMB 2021. Scanning electron microscopy (SEM) and atomic force microscopy were employed to determine th…