Materials Literature
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The magnetic oxides NaFeP(2)O(7) and LiFeP(2)O(7), made up of FeO(6) octahedra containing high-spin Fe(3+)(d(5)) ions, undergo a three-dimensional antiferromagnetic ordering at low temperatures. The strengths of various Fe-O...O-Fe super-superexchange interactions of NaFeP(2)O(7) and LiFeP(2)O(7) were estimated on the…
We hereby describe a novel example of light driven phase transitions in a photoresponsive dimesogen, which goes through different pathways at different temperatures. The isomer ratios required to obtain the phase transition in each case have also been determined.
A new concept of microstructural designing of polymer-free polycrystalline composite materials is offered. The concept based on controllable substitution during composite formation of separate crystallites making a polycrystal by pores, crystallites with other composition and/or structure or amorphous substances with…
The reaction of Mn(acac)3 with 3 eq. of Al(OiPr)3 in toluene at reflux provided with minor yield single crystals of MnAl2(acac)3(OiPr)4(OAc)(C7H8)0.5 (1), incorporating into the molecular structure the acetate ligand originating from oxidation of the OiPr-groups. 1 was obtained with high yield (76%) via the reaction o…
Characteristics of dimethyl ether oxidation and formaldehyde formation with NO X reduction catalysts were investigated in comparison with noble metal catalysts. The catalysts used in this research were Co and Sn as NO X catalysts and Pt, Pd, Rh as noble metal catalysts. Moreover, all the catalysts were loaded with gam…
Specific heat of polycrystalline BaTiO3 thin films on the fused quartz substrate was measured by ac-hot probe method. Phase transition temperature and excess entropy were determined as a function of film thicknesses and grain sizes. The variation of the latter was obtained in the limits 30–150 nm by changing of the te…
Chitosan coatings on oxygen-plasma pre-treated polypropylene (PP) surfaces were formed to improve their wettability, dyeing behavior and reactivity without altering material bulk properties. XPS, electrokinetic potential and contact angle measurements as well as dye uptake tests were carried out for surface characteri…
INTRODUCTION: The aerial parts of the plant Calotropis procera produce milky white latex that causes inflammation of the skin and mucous membranes. Prostaglandins are one of the mediators released in an inflammatory response following induction of cyclooxygenase (COX). In the present study, we have evaluated the role…
The structure, physical, and mechanical properties of amorphous hydrogenated silicon carbonitride films produced by remote hydrogen/nitrogen plasma chemical vapor deposition (CVD) from 1,1,3,3-tetramethyldisilazane have been investigated. The films deposited at elevated substrate temperature of 300°C and with differen…
Abstract In experimental sciences, the recorded data are often modelled as the noisy convolution product of an instrumental response with the ‘true’ signal to find. Different models have been used for interpreting x‐ray photoelectron spectroscopy (XPS) spectra. This article suggests a method of estimate the ‘true’ XPS…
In this paper, a new numerical algorithm based on the discrete element method is presented for analyzing the dynamic problems under impact loading. Based on the basic principle of continuum mechanics, a connective model for orthotropic media is derived using disk elements. It is also extended to a bilinear hardening e…
The mononuclear complex [Fe(SC2H3N3)(SC2H2N3)(NO)2]·0.5H2O 1 of the ‘g = 2.03 family’ with protonated and deprotonated ligands, which provide a neutral structure and are connected via the sulfur atom in a monodentate way, has been synthesised and characterised by X-ray diffraction, IR, EPR and Mössbauer spectroscopy
Reactants, products and transition state species involved in the decomposition of methoxide, CH3O to CH2O + H and CH3 + O fragments on the PdZn(100) surface have been studied theoretically. We used periodic slab models and a density functional method and compared our results to those for the corresponding complexes on…
Electrical conductivity of porous silicon fabricated form heavily doped p-type silicon is very sensitive to NO$_2$, even at concentrations below 100 ppb. However, sensitivity strongly depends on the porous microstructure. The structural difference between sensitive and insensitive samples is independently confirmed by…
Synthesis of various 9, 10-diarylanthracene derivatives via bis-Suzuki-Miyaura cross-coupling reaction as a key step is described. Availability of the 9,10-dithienylanthracenes derivatives where the thiophene unit is present in the molecule (e. g. 11, 12, 14) may provide an easy access to novel polymer and/or dendrime…
The change in the secondary and tertiary structure of bovine serum albumin (BSA) induced by the interaction with spherical polyelectrolyte brushes (SPB) has been investigated using fluorescence and circular dichroism (CD) spectroscopy. The SPB consist of poly(acrylic acid) chains grafted to a poly(styrene) core. The c…
Abstract A number of polyphase or single-phase ceramic waste forms have been considered as options for the disposal of nuclear waste in geological repositories. Of critical concern in the scientific evaluation of these materials is their performance in natural systems over long periods of time (e.g., 10 3 to 10 6 year…
A study was carried out on the aging behaviour of a solution treated 6082 aluminium alloy deformed by equal channel angular pressing up to six passes. Aging of the so obtained ultrafine alloy was studied by DSC and TEM analyses as well as by isothermal treatments at 130, 160 and 180°C. The results showed that the form…
Silicon carbide and SiCf/SiC ceramic matrix composites are attractive materials for energy application because of their chemical stability and mechanical properties at high temperature. For these materials advanced joining techniques are under development and, among them, brazing is one of the most promising. In this…
The rate of dissolution, of the native film on electrochemically polished, single-crystal [(100), (110), and (111) orientations] and polycrystalline Al electrodes is reported. Measurements were made in solutions containing between 0 and 75 mM NaCl. is determined by analysis of voltammetric curves recorded during film…