Materials Literature
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The synthesis of a new family of 1,2-diarylethenes, helically locked 1,2-dithienylethenes, is reported, along with their photochromic properties in solution and as polymeric films.
Ferroelectric domain assemblages of bulk and thin film Pb(Zr,Ti)O3 (PZT) ceramics are characterized as a function of grain size. Specifically, domain morphologies of chemically prepared, bulk PZT 95/5 (rhombohedral symmetry) ceramics are compared to tetragonally distorted perovskite PZT thin films of composition rangi…
Carbothermal reduction of titanium dioxide is a very complex reaction. It comprises several successive or simultaneous reactions, interest being focused on the sequence: which is itself composed of two reactions: the first being a quasi-equilibrium which fixes the partial pressure of carbon dioxide for the second reac…
A microscopic model for the description of the proton subsystem dynamics in superionic crystals with hydrogen bonds is developed. Besides the inclusion of the proton-transport mechanism, the effect of the displacement of the nearest oxygens during hydrogen-bond formation is taken into account. The latter effect is the…
The energy-resolved momentum densities of thin polycrystalline aluminium films have been measured using electron momentum spectroscopy (EMS), for both the valence band and the outer core levels. The spectrometer used for these measurements has energy and momentum resolutions of around 1.0 eV and 0.15 atomic units, res…
The crystal and molecular structures of three reaction products formed between dimethyl sulfide and bromine have been characterised by high resolution powder synchrotron X-ray diffraction. Depending on the method of preparation, three compounds have been identified as (CH3)2SBr2, (CH3)2SBr2.5 and (CH3)2SBr4. The first…
Se citan diez taxones de diatomeas por primera vez para la Amazonia colombiana. Los taxones pertenecen a los géneros Cyclotella (1), Aulacoseira (2), Achnanthes (1), Lemnicola (1), Amphipleura (1), Gyrosigma (1), Stauroneis (1), Hantzschia (1) Y Nitzschia (1). Cuatro de ellos, Aulacosiera granulata var. anqustissima,…
The Ca-sequestering capacity of the equimolar mixture of aldonic acids or aldaric acids obtained by selective catalytic oxidation of the hydrolysis products of lactose (D-glucose and D-galactose) was determined using a Ca ion selective electrode. Also, the Ca-sequestering capacity of each component of these mixtures w…
It is known that an ultra-fine grain size can be achieved by a special intense plastic straining processes. In this paper, the authors propose a novel intense plastic straining process named the Accumulative Roll-Bonding(ARB) for bulk materials. In the process, a strip is put on another strip neatly, at first. The two…
The objective of this paper was to determine the time course and extent of platinum uptake into human malignant glioma tissue. An intraoperative, intravenous infusion of carboplatin was given to nine patients (seven glioblastoma and two anaplastic glioma) undergoing tumour excision. Carboplatin dosage was calculated i…
To study the effect of ion pairs (f and d–f) coupled in a polymeric system on their optical and magnetic properties, syntheses of homo- and heteronuclear systems were undertaken. Single crystals of the polynuclear Nd glutarate of formula [Nd(Glut)(H2O)4]Cl·2H2O (1) were obtained. The X-ray diffraction analysis shows t…
Electromigration behavior under pulsed directional current (PDC) was investigated theoretically and experimentally. A vacancy diffusion equation under current stress was derived, and the relationship between vacancy concentration and time to failure was calculated numerically. The results show that if Joule heating is…
The partial decomposition of the organometallic compound Ru3(CO)12 on a TiO2(110) surface is observed at room temperature. Thermal treatment of the surface at 400°C leads to the formation of a surface alloy of formula Ti(1-x)RuxO2 that is characterized by means of XPS, XPD and LEED measurements.
The mechanical and handle properties of three groups of double weft-knitted fabrics are measured using the KES-FB system. The double-jersey fabrics consist of double weft-knitted structures (knit, tuck, and welt stitches), and are further divided according to density and then fully relaxed. For hand measurements, seve…
The synthesis of MgO-B 2 O 3 mixed oxides by coprecipitation from Mg(OH) 2 and B(OH) 3 (0-10 wt%) led to solids with textural and acid-base properties rather different from pure magnesium oxide. DRIFT and 11 B MAS NMR studies showed that boron atoms are in a flat trigonal environment, as part of the magnesium oxide st…
A highly efficient practical method for the insertion of Fe and Mn ions into different types of porphyrins 1a - f under mild con- ditions has been developed.
Poly(dimethylsiloxane)s (PDMS) of different crosslinking degrees were synthesized by varying the ratio of B(crosslinker)/A(vinyl-type PDMS) in the mixture to be crosslinked, and by varying the crosslinking temperature. The swelling degrees of the polymer in pure water, pure ester (ethyl acetate) and their mixture decr…
Porphyrin-centered star-shaped polymers were synthesized through living cationic ring-opening polymerization of 2-methyl-2-oxazoline employing tetra(p-chloromethylphenyl)porphyrin (CMPP) and its zinc complex as initiators. The polymers were characterized by GPC, 1 H NMR and UV-vis and their properties were examined by…
Two palladium complexes are described with very high helical twisting power and producing blue phases, in one case preserved in a glassy state for several days.
meso-Phenylporphyrins bearing a single isothiocyanate group react efficiently under ambient conditions with primary amino groups on proteins and polystyrene resins.