Materials Literature
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The scope, mechanism and kinetics of the aerobic epoxidation of alkenes with an aldehyde and substituted β-diketonate–transition metal complexes as catalysts were studied. β-Diketonate complexes of nickel(II) proved to be among the best catalysts for this reaction. The epoxidation is not dependent on substrate concent…
Zinc meso-tetra(4-amidophenyl)porphyrin assembles into open two-dimensional arrays parallel to the porphyrin plane by self-complementary hydrogen bonding between the –CONH2 recognition sites of adjacent molecules; manganese meso-tetraphenylporphyrin perchlorate and the bidentate 4,4′-bipyridyl ligand afford one-dimens…
The shear strength of adhesive joints at high loading rates is evaluated with the split Hopkinson bar technique using a pin-and-collar specimen. A commercially available cyanoacrylate adhesive(commonly termed an instantaneous adhesive)and two different adherend materials are used in the tests. The impact shear strengt…
A spring loaded tactile sensor with displacement sensing has been evaluated for non-invasive assessment of physical properties, stiffness and elasticity, of human skin in vivo. The tactile sensor consists of a peizoelectric vibrator (61 kHz) with a vibration pickup, electronics and PC with software for measurement of…
The mechanism of silane thermal decomposition is investigated in a flow reactor. The time dependencies of silane consumption and disilane formation were compared with those parameters of solid product (aerosol particles) such as concentration, total hydrogen content in solid product, and fraction of hydrogen contained…
Active Matrix (AM) LCDs and STN LCDs are the leading display technologies for portable applications such as notebook computers. Recently, new LCD device configurations and new LCD operation modes have been introduced. The existing technologies and the new LCD operation modes require improved liquid crystal materials.…
Lithiation of 4,5-bis(methylsulfanyl)-TTF 9, 4,5-(ethylenedisulfanyl)-TTF 10, 4,5-dimethyl-TTF 11 and 4,5,5′-trimethyl-TTF 12 (TTF=tetrathiafulvalene) followed by reaction with methyl isothiocyanate affords the corresponding (N-methylthio-carbamoyl)-TTF derivatives 14–17, respectively, in 54–70% yields. These new TTF…
High-resolution X-ray powder diffraction using synchrotron radiation has been used to determine the unit-cell parameters of binary (n-C20H42 /n-C21H44 and n-C20H42 /n-C22H46), tertiary (n-C19H40 to n-C21H44 and n-C20H42 to n-C22H46) and quinternary (with alkanes ranging from n-C18H38 to n-C26H54) n-alkane mixed homolo…
Platinum and platinum oxide nanoparticles are deposited on electronically and ionically conducting polypyrrole/polystyrenesulfonate particles by the reduction of Pt(NH3)4Cl2 with formaldehyde and the oxidation of Na6Pt(SO3)4 with H2O2, respectively.
Formation of nanometer-sized particles in NH3/SO2/H2O/Air mixtures by α-ray irradiation was studied experimentally to evaluate the effect of NH3 gas on the gas-to-particle conversion process. The total particle number concentration, the charged-particle fraction, and the electrical mobility distribution of particles g…
Al1.8Fe0.2O3 solid solutions have been prepared as amorphous, η (cubic) and α (corundum) phases. The oxides have been reduced in a H2–CH4 gas mixture at 900 or 1000 °C, giving rise to composite powders containing alumina, α- and γ-Fe, Fe3C and different forms of carbon including nanotubes, thick tubes and spheroidal p…
Iron(III) 5-(pentafluorophenyl)-10,15,20-tris(2,6-dichlorophenyl)porphyrin has been synthesised and used to catalyse hydrocarbon oxidation by iodosylbenzene. In homogeneous solution it is shown to be a stable and effective catalyst for alkene epoxidation and alkane hydroxylation with a selectivity and reactivity close…
A novel solvothermal method has been developed to obtain nanocrystalline Cu 2–x Se at low temperature; CuI and Se were placed at 90 °C for 4 h in an autoclave with ethylenediamine as solvent and the product was characterized by XRD, TEM and XPS. The results revealed that as prepared Cu 2–x Se grains were nearly homoge…
Soft lead zirconate titanate (PZT) ceramics exhibit a nonsymmetric deformation behavior, where the tensile strains exceed the compressive strains for a given stress level. This phenomenon affects the strains in bending tests. In addition to the normally determined bending strain that is measured by the curvature of a…
An exact nonperturbative inversion method is described for transmission electron diffraction which allows crystal structure factors to be obtained directly from the intensities of multiply scattered Bragg beams. These amplitudes are required at several thicknesses (or electron beam energies) and orientations of a thin…
Surface enhanced resonance Raman scattering (SERRS) has considerable potential as an ultra-sensitive analytical technique; for the first time the synthesis of specific dye ligands designed to overcome major problems in obtaining reliable SERRS is described.
A cyclic Zn-porphyrin trimer with ethyne and butadiyne links stabilises the thermodynamically disfavoured endo transition state and product of a reversible Diels–Alder reaction; at 30°C the endo adduct is formed rapidly and almost exclusively. Linear porphyrin dimers containing ethyne or butadiyne links show related s…
Multimetallics such as dendrimer 3 which are functionalised at their periphery with platinum(II) metal centres reversibly absorb SO2 to yield macromolecules with significantly enhanced solubility characteristics and drastic colour changes; properties which make these compounds highly active sensors for milligram quant…
Abstract Highly concentrated 0.5 M II‐VI semiconductor quantum dot solutions for coating applications can be synthesized employing chalcogenolysis and condensation of functionalized cluster‐like cadmium and zinc ethoxy‐acetates. Furthermore, in nucleation studies on CdSe solutions, new magic clusters between 0.42 and…
The effect of temperature on the surface plasmon absorption of Au@SiO2 particles has been measured from 14 to 70°C in aqueous solutions and from 16 to 50°C in ethanolic solutions. The particles remain completely dispersed at elevated temperatures because of the silica shell. As the temperature is increased, there is p…