Materials Literature
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For most alkoxycyanobiphenyls (3OCB, 5OCB, 6OCB, 7OCB and 9OCB) it has been observed that slow or delayed cooling gave rise to a lower melting crystalline polymorphic form which then slowly converted into the higher melting stable crystalline structure. Although under slow evaporation from a solvent, polymorphic cryst…
Abstract The occurrence of transesterification reactions in poly(ethylene terephthalate) (PET)/poly(ethylene naphthalate) (PEN) blends prepared in presence of triphenyl phosphite (TPP) was investigated. When PEN was processed with TPP, which is a known chain extender for PET, chain extension reactions also took place.…
Atomistic simulation techniques are now able to model the structure of mineral surfaces at the atomic level. In this paper we begin to address the question of whether surface reactivity can be studied reliably by modelling the surface reactivity of calcite, fluorite and forsterite under aqueous conditions. We first us…
Abstract Hydrothermal reactions between aqueous Na2MoO4, Na2ESO3 (E = S, Se) and hydrazine monohydrate at 135 °C for 12 h produce phase-pure MoS2 and MoSe2 with good yield of about 90%. X-Ray powder diffraction, chemical analysis and X-ray photoelectron spectroscopy were used to characterize the structure and composit…
Scoured silk fibre was dissolved in a solution of calcium chloride in water and ethanol. After dialysis against purified water, theophylline as model drug was added to the solution. Silk microspheres prepared after spray-drying were round but somewhat wrinkled; their diameter was 5 μm (approx.). According to powder X-…
We have fabricated oriented copper-phthalocyanine (CuPc) films by vacuum deposition on rubbed polyimide (PI) alignment layers. It was found that the b -axis of α-type CuPc microcrystals changes its direction depending on the thickness of PI layers, namely, the b -axis is perpendicular to the rubbing direction on a thi…
The epitaxial Bain path (EBP) of antiferromagnetic (AF) tetragonal Mn has been found by first-principles total-energy calculations using the full-potential linearized-augmented-plane-wave (FLAPW) method with two different potentials: (1) the local-spin-density-approximation without relativistic corrections (LSDA-NREL)…
Abstract The focused ion beam(FIB) technique, developed for the microelectronics industry has become a major method for site specific transmission electron microscopy(TEM) specimen preparation in a wide range of materials[l]. The FIB lift-out technique has improved the specimen preparation procedures by removing compl…
Abstract Crystals of Hg 2 (H 2 AsO 4 )2 , which are isotypic with the corresponding dihydrogenphosphate Hg 2 (H 2 PO 4 ) 2 , were obtained from a concentrated arsenic acid solution. The crystal structure (P2 1 /n, a = 6.1838(4), b = 15.0987(9), c = 4.7989(3) Å, β = 91.977(1)°, Z = 2, R = 0.045 for 1318 structure facto…
There are plans at ASDEX Upgrade to cover the heat shield of the inner main chamber wall with tungsten coated graphite tiles. Four tiles were installed at different poloidal positions of the heat shield and removed after a full experimental campaign. The tiles were analysed by means of Rutherford backscattering (RBS)…
We report the results of a high-resolution synchrotron X-ray powder diffraction study of polymerised CsC 60 in the temperature range 4 to 40 K. Its crystal structure is monoclinic (space group I 2/ m ), isostructural with RbC 60 . Below 14 K, a spontaneous thermal contraction is observed along both the polymer chain a…
The reaction of zinc tetrakis(3-pyridyloxy)phthalocyanine (1) with NH 4 [ PtNH 3 Cl 3 ] leads to zinc tetrakis(cis-[3-oxypyridyl]-N]amminedichloroplatinum(II))phthalocyanine (2), while the reaction of 1 with cis- Pt ( DMSO ) 2 Cl 2 or 2 with DMSO forms zinc tetrakis(cis-[(3-oxypyridyl)-N]dichloro[sulfinylbis(methane)-…
Although it is widely known to textile scientists that when yarn twist exceeds the optimal level, yam strength will decline due to the so-called obliquity effect, the exact physical mechanism behind this obliquity effect is still unknown. It is therefore our objective to investigate this issue. We adopt a special tech…
Abstract Several species of freshwater green algae belonging to the order Zygnematales (Spirogyra crassa (Ktz.) Czurda, S. longata (Vauch.) Ktz., and Mougeotia viridis (Ktz.) Wittr.) were found to have a specific composition of the volatile fraction, which confirms an earlier proposal for the existence of two groups i…
Luminescent Si nanocrystals formed in SiO 2 layers were irradiated with electrons and He + ions with energies of 400 and 25–130 keV, respectively. The effects of irradiation and subsequent annealing at 600–1000°C were studied by the methods of photoluminescence and electron microscopy. After irradiation with low doses…
Molecular dynamics simulations of alumina containing silicate glasses have been performed in order to determine the influence of that ion on the final properties of the glasses. In particular, short- and mid-range structures were analyzed in terms of the distribution of non bridging oxygen, bridging oxygen, three brid…
Thermoplastic copolyimide synthesised from 3,3′, 4,4′-benzophenonetetracarboxylic dianhydride, 4,4′-oxydianiline, and 1,3-phenylenediamine were success fully coated onto carbon fibres by electrochemical deposition and subsequently impregnated with polymerisable reaction mixtures of PMR-15 thermosetting polyimide. Carb…
Molecular assemblies of meso-pyridylporphyrins and zinc(II) 1,8,15,22-tetrakis(3-pentyloxy)phthalocyanine held through axial coordination are reported. Their formation has been revealed by 1H NMR spectroscopy and photophysical measurements.
The possibility of using CVD diamond films as dosimeters in radiotherapy applications has been tested in both off-line and on-line configurations. The thermoluminescent and thermally stimulated current responses after 20 MeV electron and 22 MeV proton irradiation have been studied as a function of the dose up to 10 Gy…
Temperature dependence of the deformation behavior of Mg-alloy single crystals containing 0.5 at.%Dy or Zn is investigated by compression tests at various test temperatures ranging from 77 K to 473 K. The basal slip operates and the CRSS increases with decreasing temperature at the temperature range lower than room te…