Materials Literature
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In this work, the sol-gel process in non-aqueous system of tetraethylorthosilicate (TEOS) has been investigated. The formation of spherical silica nanoparticles was studied using 1H and 13C NMR, FTIR spectroscopies and TEM. It was demonstrated that FTIR, TEM and 1H NMR can be employed to monitor effectively the conver…
The sonoelectrochemical degradation of cyanide ions (CN-) in the presence of 6 types of electrodes (aluminium, titanium, nickel, copper, stainless steel (inox), and graphite) were investigated in order to emphasise the influence of the electrode type on the efficiency of the degradation process.
We report a polarity-sensitive electro-optical response observed in nematic liquid crystal cells characterized by asymmetric insertion of thin films of titania-vanadia oxide with a Ti∕V atomic ratio of 1∕1, prepared by sol-gel synthesis on transparent indium tin oxide. The electro-optical effect is opposite to previou…
A model of the quasi-Debye loss mechanism in SrTiO3 and Ba0.6Sr0.4TiO3 perovskite ferroelectrics at microwave frequencies is presented. The field dependence and the size of the field-induced quasi-Debye loss contribution in SrTiO3 and Ba0.6Sr0.4TiO3 systems have been evaluated in the simple approximation of the isotro…
Ordered mesoporous TiO2–NiTiO3 thin films, with nickel content x < 0.5, were prepared by dip-coating an acidic solution of hydrolysed transition metal chlorides in controlled humidity, followed by a very careful annealing treatment. These latter treatments were studied by in situ SAXS-WAXS experiments involving synchr…
The analysis of detailed magnetization measurements, supplemented by zero-field ac susceptibility data, on single-crystal ${\mathrm{La}}_{0.73}{\mathrm{Ba}}_{0.27}{\mathrm{MnO}}_{3}$ indicates the occurrence of a continuous ferromagnetic-to-paramagnetic phase transition at 245 K. This transition is characterized by ex…
A series of composite materials based on a hydrophobic mesoporous silica (MCM-41-m) filled polytetrafloroethylene (PTFE) were synthesized. The composite boards prepared from the composite materials were thermally stable The dielectric constant and z -axis coefficient of thermal expansion were significantly decreased w…
Abstract The ultrasonic treatment of butyl rubber gum during extrusion with a grooved‐barrel ultrasonic reactor was carried out at a mean residence time of 3.6 s and at different ultrasonic amplitudes. Gel permeation chromatography, NMR spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and d…
We studied the luminescence properties of Eu 2 + in CaAl 2 Si 2 O 8 . In CaAl 2 Si 2 O 8 : Eu 2 + phosphor, two emission bands were observed. Because the two emission bands of CaAl 2 Si 2 O 8 : Eu 2 + phosphor are quite different, it can be presumed that Eu 2 + ions occupy two types of sites, namely, Eu 1 and Eu 2 . T…
It is well known that rigid dipolar solutes (in smaller quantity) dispersed in a nonpolar glassy matrix exhibit a sub-T(g) (or beta(s)) relaxation due to the solute often designated as Johari-Goldstein (JG) relaxation, which is intermolecular in nature. In this article, we report the results of our study of such a sub…
Abstract Covalently bonded layered silicated/polystyrene nanocomposites were synthesized via atom transfer radical polymerization in the presence of initiator‐modified layered silicate. The resulting nanocomposites had an intercalated and partially exfoliated structure, as confirmed by X‐ray diffraction and transmissi…
Abstract (enH 2 )[{Mn(en) 2 (enH)} 2 (μ‐en)](Ge 2 Se 7 ) 2 ( 1 ) and [Mn(dien) 2 ] 2 Ge 2 Se 7 ( 2 ) can be prepared by solvothermal reaction of elemental Ge and Se with Mn(OOCCH 3 ) 2 ·4H 2 O in respectively superheated ethylenediamine/methanol (3:2 mixture, 150°) and diethylenetriamine (dien, 130 °C). The cyclic Ge…
Thin polystyrene (PS) liquid films supported by oxidized silicon (SiO x /Si) substrates may be unstable or metastable, depending on the film thickness, h . In the metastable thickness regime, holes nucleate throughout the surface of the films and subsequently grow under the action of capillary forces. Recent studies s…
Abstract Properties of injection‐molded biodegradable polyesteramide composites containing 5 and 13 wt% octadecylammonium‐treated montmorillonite clay have been studied. Oxygen transmission rates and mechanical properties were measured. X‐ray diffraction was used to assess the degree of intercalation of the clay layer…
The superelastic/shape-memory material, Nitinol, an approximately equiatomic alloy of Ni and Ti, is rapidly becoming one of the most important metallic implant materials in the biomedical industry, in particular for the manufacture of endovascular stents. As such stents are invariably laser-machined from Nitinol tubes…
The structure of yttrium oxide influences the CO oxidation activity of Au/Y2(O3) catalysts; nanocrystalline Y2(O3) stabilizes more active species of gold and increases the activity of the gold catalyst in comparison with mesostructured and precipitated Y2(O3).
The surface conductance of hydrogen-terminated diamond was investigated under air, HCl, and NH 3 vapors using tungsten point contacts, gold/titanium ohmic contacts, and aluminum rectifying contacts. In all cases the conductance decreased with increasing pH. Upon imposition of a step temperature change, there is a tran…
An azido-bridged chain with formula [Mn(Menic)(N3)2]n, where Menic is methylnicotinate, was prepared and studied from the magnetic point-of-view. This compound crystallizes in the monoclinic system, space group P21/a, with a = 15.556(2), b = 16.831(2), c = 17.595(2) Å, β = 110.80(1)° and Z = 10. The structure consist…
Electric-field-induced transient pore formation (electroporation) in synthetic unilamellar dioleoylphosphatidylcholine vesicles of 178-nm diameter is utilized for the preparation of subnanometer-size PbS quantum dots. With Pb2+ ions originally entrapped in the vesicles and S2- ions placed in the bulk, their reaction i…
The local, temperature dependent structure of poly-(ethylmethacrylate) was studied with wide-angle x-ray scattering. The results were set into context to recent wide-angle neutron scattering results as well as to the results from a multitude of studies of the dynamics of this polymer. The temperature dependence of the…