Materials Literature
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Two methods for determination of the mean size of gold nanoparticles, based on measurement of the wavelengths of the maxima λ max of side scattering and extinction in the range 400–700 nm, are compared. Four sols with mean particle diameters d of about 15, 20, 25, and 30 nm, measured using the dynamic light-scattering…
A homologous series of silver complexes of 1-alkylimidazoles (R-im, R = CnH(2n+1), where n= 10, 12, 14, 16 and 18) was synthesized. All the CnH(2n+1)-im ligands are non-mesomorphic. Upon complexation, all the [Ag(CnH(2n+1)-im)2]-[NO3], except for n = 10, exhibit liquid crystalline properties. The crystal structure of…
Ultrasound was irradiated to a micro-1D and -2D space having a characteristic length of 200 microm, and the presence of cavitation was confirmed from video images, and the generation of OH radicals, which was quantitatively evaluated with fluorometry.
A series of fourteen heteroleptic (phthalocyaninato)(porphyrinato) rare earth(III) double-decker complexes, [MIII(Pc)(TClPP)] [M = Y, La–Lu except Ce and Pm; Pc = phthalocyaninate; TClPP = meso-tetrakis(4-chlorophenyl)porphyrinate] has been prepared by base-promoted cyclization of phthalonitrile on the corresponding […
Porous titanium dioxide is an attractive material for solar cell application on account of its stability, electron transport properties, and the possibilities for controlling surface morphology as well as for its ease of fabrication and low cost. Nanostructured TiO 2 has been intensively studied for applications to dy…
Ni-free Ti-Sc-Mo shape memory alloys are designed as a substitute for Ti-Ni alloys in the biomedical field. From results of bending and recovery test with heating, Ti-Sc-Mo alloys were found to have superior shape memory effect. The optimum composition for the shape memory effect was Ti-4.0 to 6.0Sc-6.0Mo alloys. The…
We report a carboxylate triangle consisting of three manganese(II) centres which is made from manganese(II) carbonate and pivalic acid. The magnetic exchange within the triangle is extremely weak, and antiferromagnetic. Several models have been used to fit the magnetic data, and the best fit uses two weak antiferromag…
Biocomposites can be designed and engineered from plant bio-fibres and a blend of unsaturated polyester resin and derivatized vegetable oil to replace existing glass fibre-polyester composites for use in housing applications. Natural fibre composites (biocomposites) would provide environmental gains, reduced energy co…
We present here the synthesis, physicochemical characterisation and catalytic evaluation of mesoporous silicon oxynitride materials. The solid base catalytic materials were prepared by subjecting pure silica MCM-41 mesoporous molecular sieves to nitridation, i.e., treatment with ammonia at high temperature. The mesopo…
Abstract The molecular structures of naphtho[1,8‐ cd ][1,2]dithiole, naphtho[1,8‐ cd ][1,2]diselenole, naphtho[1,8‐ cd ][1,2]ditellurole, naphtho[1,8‐ cd ]‐ [1,2]dithiole 1‐oxide, naphtho[1,8‐ cd ][1,2]dithiole 1,1‐dioxide, and naphtho[1,8‐ cd ][1,2]dithiole 1,1,2‐trioxideand naphtho[1,8‐ cd ][1,2]dithiole 1,1,2,2‐tet…
Structural, magnetic and theoretical studies of an octanuclear chromium(III) wheel are reported, containing hydroxide and pivalate bridges.
Two complementary fabrication technologies are employed in the production of materials and tools. In the ‘top-down’ approach, materials and tools are manufactured by stripping down an entity into its parts, e.g. carve a boat from a tree trunk. This contrasts sharply with the ‘bottom-up’ approach, in which materials an…
1-Hexadecane-3-methylimidazolium bromide and 1-hexadecane-2,3-dimethylimidazolium bromide were used as new templates for the syntheses of periodic mesoporous organosilica (PMO) materials; using these new templates, ethane-bridged PMO materials were successfully synthesized and characterized under basic conditions.
Binary NaNbO3-ABO3 perovskite solid solutions belonging to the group II according to N.N. Krainik classification (Izv. Akad. Nauk SSSR, Ser. Phys. 28, 643 (1964)) exhibit a relaxor-type behavior when the second component concentration exceeds a threshold value x0, corresponding to the abrupt decrease of the dielectric…
In the present work different parameters, which influence the release of diclofenac sodium (2-[(2,6-dichlorophenyl)amino]benzeneacetic acid mono sodium salt) from lipophilic matrix prolonged release tablets, were investigated. Solubility characteristics of diclofenac sodium in aqueous media with various ionic strength…
Soils in Estonia are characterised by washing out, i.e. leaching, of calcium carbonates and magnesium carbonates. Calcium losses from the arable layer may amount 150-500 (600) kg ha -1 a year, resulting in excessive concentration of free hydrogen ions in the soil solution, and therefore these soils require liming. Rel…
Molecular selective adsorption of alkylphenols and alkylanilines onto n-alkyl grafted MCM-41 with different alkyl chain lengths and Al contents was studied. Octyl groups gave better adsorbent performance than pentyl and dodecyl groups. Nitrogen and water adsorption isotherms revealed that the octyl-grafted sample has…
Following recent studies which showed that the most stable structures for (ZnS)(n) clusters (n= 10-47) are the so-called "bubble clusters", in which all the atoms are three-coordinated, we have used simulated annealing techniques to find the most stable structure for a larger cluster, (ZnS)(60). We find an onion-like…
This study presents a rapid continuous process for grain refinement in metallic materials through severe plastic deformation (SPD). The principle is described and the process is applied to an Al-5056 alloy and an S45C carbon steel. The new process, designated in this study the severe torsion straining process (STSP),…
Di-(2-ethyl hexyl) phthalate (DEHP), a conventional plasticizer in polyvinyl chloride (PVC), was partially replaced by polymeric plasticizers. Three different elastomers such as nitrile rubber (NBR), carboxylated nitrile rubber (XNBR) and epoxidized natural rubber (ENR) were used as polymeric plasticizers. Mechanical…