Materials Literature
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1,5-Dioxepane-2-one (DXO) was coordinatively ring-opening polymerized with different Lewis acids in bulk and solution. The reactivities of a series of initiators (SnCl4, FeCl3, AlCl3, BCl3, and BF3OEt2) at different temperatures and reaction times were analyzed. Polymerization of DXO in bulk with SnCl4, FeCl3, AlCl3,…
Real-space observations of gasification reaction of graphite surface caused by UV irradiation were made using scanning tunneling microscopy (STM). The formation of etch pits on highly oriented pyrolytic graphite (HOPG) surface during gasification reaction was investigated. At the beginning of gasification reaction, do…
Abstract Sedimentary zeolites clinoptilolite, mordenite and erionite occur as diagenetic products of ash falls of rhyolitic composition from the Oligocene Chichindaro Formation at the limits of the Mexican Volcanic Belt with the Mexican Highland. These zeolitic tuffs were formed from open hydrologic environments where…
TL emission characteristics have been studied from LiF(Mg,Cu,P) samples prepared at the Institute of Nuclear Physics in Krakow, Poland in which the Cu concentration has been varied from 0.002 mol% to 0.5 mol% while the Mg content (0.2 mol%) and P content (1.25 mol%) were kept constant. Thermoluminescence has been reco…
Thermal quenching of TL processes in dosimetric anion-defective a-Al2O3 single crystals was studied by investigating the temperature dependence of radioluminescence and photoluminescence in the range of 77-550 K. It is established that the process of quenching is most effective in the temperature range of the dosimetr…
Abstract Nine new compounds AMX with A: Ca, Sr, Ba, M: Pd, Au and X:P, As were prepared by heating mixtures of the elements and investigated by Xray methods. They crystallize in modified AIB 2 - type structures, for the present examples in the ZrBeSi- and SrPtSb-types, with an ordered distribution of the atoms
The relaxation of density fluctuations in charge-stabilized colloidal suspensions is characterized by the dynamic structure factor S(q,t), which can be measured by dynamic light scattering. Whereas the short-time behavior of this quantity is well understood, its characteristics at longer times are more difficult to de…
Abstract A comparative study is reported in which kaolinite has been hydrothermally synthesized at several pH conditions. The syntheses were carried out at 220 °C for 3 to 10 d with distilled water or acidic solutions using a mixture of silica-gel derived from alkoxide and gibbsite with a Si/Al ratio of 1:1 as the sta…
In Buenos Aires province, the river Samborombón, which is typical of the plain, was sampled monthly during 1986-1987 in research carried out both on its physico-chemical characteristics and the communities present - plankton, phytobenthos, zoobenthos -. In this paper the structure and function of phytoplankton and ben…
Abstract Die bislang unbekannte Kristallstruktur der schwarzen, binären Verbindung Al 2 Te 5 wird durch Rietveld‐Verfeinerung an Röntgen‐Pulverdaten aufgeklärt: a = 1359,29(3) pm, b = 415,27(1) pm, c = 983,92(2) pm, β = 126,97(1)°, Raumgruppe: C2/m (Nr.12), Z = 2. Al 2 Te 5 ist im Unterschied zu Ga 2 Te 5 und In 2 Te…
The physical interactions of polymers with inorganic substrates are determined by two major contributions: Van der Waals forces and acid-base interactions, taken in the most general “Lewis” electron acceptor-donor sense. The present work shows that the work of adhesion can be very appreciably increased by the creation…
The modal analysis of samples belonging to the zeolite-rich pyroclastic formation named “Neapolitan yellow tuff” (Central and Southern Italy) has been determined by full-profile refinement of X-ray powder diffraction (XRPD) data using a combined Rietveld–RIR method. The quantitative analysis and especially the zeolite…
Abstract The new phases M III Sr 3 Ni III O 6 have been prepared for M = Sc, In, Tm, Yb and Lu. Thermogravimetric analysis indicates that these phases are stoichiometric nickel(III) oxides. Rietveld refinement of their crystal structures from powder X‐ray diffraction data confirms that they adopt the rhombohedral K 4…
A mathematical model for the description of the overall crystallization of polymers has been developed which separates the pure geometric spreading of the semicrystalline superstructures from the increasing crystallinity inside these entities. The model uses the Avrami theory for the geometric part and a freely option…
Abstract A very unusual magnetic behaviour of α - Bi 2 O 3 was observed in a wide range of temperatures and magnetic fields. A longitudinal magnetoelectric effect was found at 4.2 K. The existence of an antiferroelectrically ordered subsystem of electric dipoles in α - Bi 2 O 3 is proposed. The mechanism of spin-orbit…
Abstract In this paper the corrosion behaviour of copper in 5% (by weight) citric, sulphuric and hydrochloric acids is studied. The efficiency of 2‐amino‐5‐mercapto‐1,3,4‐thiadiazole (AMT) as a corrosion inhibitor is compared with the use of benzotriazole (BTA). The experimental techniques were weight loss, polarizati…
N‐benzyl triethanol ammonium chloride (BTAC) and ethoxylated n‐benzyl triethanol ammonium chloride (EBTAC) were synthesized. The prepared compounds were characterized, then tested for their evaluation as corrosion inhibitors for steel pipelines in typical crude oil and residual fuel oil (RFO) media through weight loss…
The TL properties of Li2B4O7:Cu have been studied in single crystal samples grown by the diameter controlled Czochralski method. The TL measurements have been performed using a home-made high sensitivity 3D spectrometer, using a heating rate of 1 oCs.-1. Two peaks have been detected in the glow curve, at 145 oC and 20…
In vacuo thin films of the phthalocyanine derivatives TPyTAPZn and F16PcZn show n-type behavior in thermopower and conductivity measurements. After exposure to air the properties are changed characteristically. Photoelectrochemical experiments show that while TPyTAPZn still behaves like an n-type semiconductor, F16PcZ…
In experimental murine inflammation-associated amyloidosis (AA amyloidosis), an interaction between heparan sulfate and serum amyloid A (SAA), the AA precursor, has been demonstrated and is believed to play an important role in AA amyloidogenesis. Poly(vinylsulfonate) sodium salt (PVS) can arrest AA amyloid induction…