Materials Literature
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The synthesis, isomeric separation, and identification of β-sulphonic phthalocyanine zinc complexes were reported. While the sulphonic phthalocyanines have been studied extensively, the development of separation technology may enable deeper insights into their isomeric constitution. An ion-pair reversed-phase high per…
Tropical Agricultural Research and Extension is a peer-reviewed international scientific journal covering a wide range of subject areas in tropical and subtropical agriculture published quarterly by the Faculty of Agriculture, University of Ruhuna, Sri Lanka. The journal is also available on the Faculty of Agriculture…
In the paper we present measurements of transport physical parameters such as thermal conductivity, diffusivity and specific heat capacity and dc electrical conductivity as well as the mechanical values E*, tg δ for rubber compounds filled by different ratio of silica - carbon black fillers. From presented results it…
In situ synthesized Fe-Cr-C-TiC high-chromium Fe-based ceramic composite coating was fabricated on substrate of Q235 steel by plasma transferred arc (PTA) weld-surfacing process using the mixture of ferrotitanium, ferrochromium, ferroboron and ferrosilicium powders. The microstructure and wear properties of the compos…
In this study, the effects of heating rate and two‐step sintering on the sintering behaviour, the microstructure and the silver diffusion of (Zn,Mg)TiO3 based multilayer ceramic capacitors (ZMT MLCCs) with pure silver electrodes were investigated. The energy dispersive spectroscopy results showed that the silver ions…
The specific features of the vibrational spectra of chrysotile asbestos, which is a natural mineral that represents a system of closely packed tubular fibers with an outer diameter of ∼30 nm, an inside diameter of ∼5 nm, and a length up to a centimeter and more, have been investigated using neutron scattering and pola…
The crystal structure of 2,2-difluoro-4-(9H-fluorene-2-yl)-6-methyl-1,3,2-dioxaborine (C 13 H 9 COCH × COCH 3 BF 2 ) (1) is determined. The structural and spectral luminescent characteristics of 1 are compared to those of its electron analogue: 2,2-difluoro-4-(4-phenylphenyl)-6-methyl-1,3,2-dioxaborine (C 6 H 5 C 6 H…
A method has been developed for calculating the density of the liquid in peat being dried, and liquid density data have been obtained for the first time for peat specimens differing in dispersity and for different drying temperatures. These data are at variance with the tabulated data for the corresponding structuring…
As we all know, transparent and conductive Al:ZnO (AZO) films are being considered for manufacturing transparent electrodes in flat panel displays, solar cells and organic light emitting diodes due to their high electro optical quality, high material availability and low material cost for large area applications. In t…
Electrochemical formation and microstructure of porous GaP have been investigated. Nanostructured porous GaP layers of thickness up to 20 m were fabricated on n-type (111)-oriented crystalline c-GaP substrates. Studies of microstructure of porous GaP in dependence on electrolyte type and regimes of technological proce…
In this work we report that when ferromagnetic metals (Fe, Co and Ni) are thermally evaporated onto n -layer graphenes and graphite, a metal nanowire and adjacent nanogaps can be found along the edges regardless of its zigzag or armchair structure. Similar features can also be observed for paramagnetic metals, such as…
From the solution of the system Na2WO4-HNO3-Ni(NO3)2-H2O acidified to Z = ν(H+)/ν(WO 4 2− ) = 1.29, the green crystals of nickel paratungstate B Ni5[W12O40(OH)2]·37H2O are isolated. By FTIR spectroscopy the isopoly anion is shown to belong to the structural type of paratungstate B. Using single crystal X-ray analysis,…
In fine-structure phosphorescence spectra of metallocomplexes of porphin with ions of the Pd(II) and Pt(II) and their meso-deuterated derivatives additional lines have been detected which have no analogs in fluorescence and resonance Raman spectra of metalloporphyrins and in phosphorescence spectra of metallocomplexes…
CeO 2 -ZrO 2 hydrosols are synthesized and the size, shape, phase composition, density, and electrophoretic mobility of particles are studied. The pH ranges of the stability of hydrosols and the thresholds of their fast coagulation in the presence of some electrolytes are determined. The nature of the aggregation stab…
The formation of the structure of TiO 2 (anatase) doped with 1–5 mol % Y 2 O 3 is reported. The dopant changes the anatase structure from regular to nanocrystalline. The nanocruystalline structure consists of incoherently intergrown 5- to 7-nm anatase crystallites (500°C) separated by interblock boundaries accommodati…
Nanoparticles based on chitosan (ÌÌ 340 kDa, DD 0.85) and galactomannans polysaccharides from four sources with different Man: Gal ratios of monosaccharides (from 1.1 to 5.3) have been obtained by ionotropic gelation. Four fractions in the interval of MM from 89 to 226 kDa have been prepared by the depolymerization of…
The spectral luminescent properties of terbium(III) complexes of 4-carboxybenzo-15-crown-5 (L1) and 4-carboxybenzo-18-crown-6 (L2) are studied. The quenching of the luminescence of lanthanide by alkali metal ions is discovered, which is referred to as the formation of mixed Tb(III)-L1-Na+ and Tb(III)-L2-K+ complexes.…
In this work, the structure and chemistry of thin nm-thick carbon films deposited on a substrate using strong 13.5 nm EUV irradiation under a strong vacuum were studied. The film structure was studied by Raman spectroscopy in comparison with the Raman spectra of well-known carbon phases: diamond, single-wall nanotubes…
This paper describes the design features and technical parameters of a complex for characterizing the fluorescence parameters of macro- and microsamples in the near-IR region. Along with the standard 90°setup for exciting and recording the fluorescence, a microfluorimetric technique is used. Two types of InGaAs photod…
The remarkable properties of graphene nanostructures have opened the door to a wide array of possible technologies, poised to have impact in a diverse range of fields. However, many of these properties have been observed under highly idealized conditions that bear little resemblance to the operating conditions of actu…