Materials Literature
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Adsorption of HCN and DCN was studied at 150-600 K on TiO(2), ZnO, MgO and a set of X zeolites by means of FTIR spectroscopy. At the lowest temperatures adsorption is non-dissociative and occurs on surface OH groups of oxides, cations and coordinately unsaturated oxygen atoms. Bands at 2243-2147 cm(-1) assignable to C…
The present study considers the electrochemical dissolution of pyrrhotite electrodes in 1 M HCl solution. Conventional electrochemical techniques as well as electrochemical impedance spectroscopy (EIS) and in situ Mott–Schottky analysis have been applied for surface studies during the anodic dissolution of the electro…
Abstract Summary: In this work, an attempt was made to synthesize a novel Chitosan‐Mesoporous silica (CS‐MS) hybrid composite to design a drug delivery system based on ultrasound triggered stimuli‐responsive smart release. The in‐vitro drug release properties of both the Mesoporous Silica (MS) and Chitosan (CS) hybrid…
A simple criterion is provided on how the (anti-)localization properties of graphene are determined in the presence of inter-valley scattering, Kane-Mele topological mass term, and Rashba spin-orbit interaction (SOI). A set of (pseudo) time-reversal operations show that the number of effective internal degrees of free…
In the present paper results of the dielectric investigation of barium titanate (BaTiO3) doped with different concentrations of lanthanum are presented. Ceramic samples were prepared by the Pechini process. With increased doping the grain size of ceramics decreases from 2.5 ?m in pure samples down to 0.2 ?m in 0.5 mol…
A novel narrowly-distributed (ND) polymeric micelle obtained in combination with host-guest recognition and self-assembly is reported. First, the adamantyl-terminated hyperbranched poly[3-ethyl-3-(hydroxymethyl)oxetane] (HBPO-AD) was synthesized by esterification of hyperbranched poly[3-ethyl-3-(hydroxymethyl)oxetane]…
Nanoparticles are being viewed as fundamental building blocks of nanotechnology. Biosynthesis of nanoparticles by plant extracts is currently under exploitation. Use of agricultural crop plant extracts for synthesis of metal nanoparticles would add a new dimension to the agricultural sector in the utilization of crop…
Ni(6) clusters of the general formula [{Ni(3)L(n)(OAc)(OH)}(2)(X)(OAc)(H(2)O)(2)] (n = 1, 2; X = Cl(-) or N(3)(-), (L(n))(3-) = hexadentate tritopic ligands) can be isolated by spontaneous self-assembly, from mixtures of Ni(OAc)(2), H(3)L(n), NMe(4)OH·5H(2)O and NaX in adequate molar ratios. Thus, four new hexanuclear…
A new strategy has been developed for continuous preparation of polyimide nanoparticles within 10 s of short residence time using a system combining a micromixer and a micro heat exchanger, where the particle size can be controlled proportionally simply by varying the concentration of poly(amic acid) (PAA).
Stencil lithography is used here for the fabrication of bismuth nanowires using thermal evaporation. This technique provides good electrical contact resistance by having the nanowire structure and the contact pads deposited at the same time. It has also the advantage of modulating nanowires’ height as a function of th…
Luminescence of gas-phase singlet oxygen optically sensitized by microporous silicon at room temperature is detected for the first time. At the same time, a photoinduced increase in the photoluminescence intensity of defects at the sample surface in oxygen atmosphere is observed. It is shown that mechanical grinding o…
The crystal structure of a simple peptidomimetic compound, derived from phenylalanine, shows the formation of a nanoporous architecture containing monodimensional π-channels with the aromatic rings as the exclusive components of the chiral channel walls.
Graphite nanosheets were produced by low-current plasma discharge in ultrasonically cavitated liquid ethanol. The microstructure, morphology and thickness of the graphite nanosheets were characterized by scanning and transmission electron microscopy, X-ray diffraction, dynamic force microscopy and Raman spectroscopy.…
A new ligand, (E)-N'-[1-(pyridin-2-yl)ethylidene]isonicotinohydrazide (HL), was prepared by condensation of 2-acetylpyridine and isonicotinohydrazide in ethanol. Its two lanthanide(III) complexes, [Nd(III)(L)(2)(NO(3))(CH(3)OH)(2)]·CH(3)CH(2)OH (1), and [Pr(III)(L)(2)(NO(3))(CH(3)OH)(2)]·CH(3)CH(2)OH (2), have been sy…
When one attempts to modulate and control the characteristics of composite materials, limit of the modulation may be dictated by the mathematical threshold of the percolation transition. We report our computer simulation, in which percolation behavior can strongly be controlled by introducing size differences in the i…
The kinetics of dissolution of cobalt oxides Co2O3 and Co3O4 in aqueous solutions of acids (H2SO4, EDTA) is experimentally studied. Dissolution rate W increases with the temperature or the EDTA concentration. The reaction orders of dissolution for hydrogen ions in sulfuric acid and EDTA (dlogW/dpH = 0.5 ± 0.1) and for…
A convenient protocol has been developed to fabricate well-defined nanorods of a photochromic molecule N-(3,5-di-tert-butylsalicylidene)-4-aminopyridine (DBSAP) by a laser ablation method. Reversible and fatigue-resistant optical switching and SHG activity were demonstrated. Interestingly, it was observed that DBSAP n…
This paper considers the crystallinity of cellulose as a factor to be considered when investigating the degradation of cellulosic fibres in cultural artefacts and the interpretation of the results of accelerated ageing experiments on cellulosic materials. The effect of acidity and resulting reduction of degree of poly…
Antibacterial activity of silver nanoparticles synthesised by irradiating an aqueous solution of AgNO3 in a bio-compatible polymer polyvinyl alcohol (PVA) with electrons from a microtron, at doses of 1 kGy and 2 kGy, has been evaluated against selected Gram-positive and Gram-negative bacteria. Nanoparticles produced b…
The electric charge accumulation under an electron beam irradiation (40 keV and 60 keV) was measured by using the pressure wave propagation (PWP) method in the dielectric insulation materials, such as polar polymeric films (polycarbonate (PC), polyethylene-naphthalate (PEN), polyimide (PI), and polyethylene-terephthal…