Materials Literature
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Poly(dimethylsiloxane)s (PDMS) of different crosslinking degrees were synthesized by varying the ratio of B(crosslinker)/A(vinyl-type PDMS) in the mixture to be crosslinked, and by varying the crosslinking temperature. The swelling degrees of the polymer in pure water, pure ester (ethyl acetate) and their mixture decr…
Porphyrin-centered star-shaped polymers were synthesized through living cationic ring-opening polymerization of 2-methyl-2-oxazoline employing tetra(p-chloromethylphenyl)porphyrin (CMPP) and its zinc complex as initiators. The polymers were characterized by GPC, 1 H NMR and UV-vis and their properties were examined by…
Two palladium complexes are described with very high helical twisting power and producing blue phases, in one case preserved in a glassy state for several days.
meso-Phenylporphyrins bearing a single isothiocyanate group react efficiently under ambient conditions with primary amino groups on proteins and polystyrene resins.
The reaction of TiCl4 with the surface of a silica gel has been investigated in detail using Fourier-transform IR photoacoustic spectroscopy (FTIR PAS) and elemental analysis. The hydroxy groups on the silica react with the TiCl4 giving rise to both monodentate and didentate surface groups. The parameters influencing…
An investigation of the defect structure of crystals of potassium hydrogen phthalate (KAP) and its relationship to the crystallization behaviour has been carried out using x-ray diffraction topography and atomic force microscopy (AFM). Crystals of KAP grown from aqueous solution were found to exhibit very low defect d…
Reactivity of the rare earth metals towards the different elements is described. Comments are mainly made on the thermodynamic data relevant to the formation of the binary compounds and to their trends. The different behaviour of the trivalent rare earths and of europium and ytterbium is underlined. An indication is a…
Giant magnetostrictive materials have drawn a lot of attentions because of their unique features. It is well known that the performance of a device using giant magnetostrictive material is affected by a preloading applied to the material. The paper presents an approach to monitoring and controlling the preloading in a…
Introduction Mineral tanning salts, in general, and chrome tanning salts, in particular, have gained importance in leather proc essing during the last two decades. The ability to produce lighter, softer, stronger and brighter leathers has rendered chrome tanning salts a tanners preference over other tan ning materia…
We consider micro- and macro-phase separation in blends of AB and BC flexible diblock copolymers. We show that, depending on architecture, a number of phase diagram topologies are possible. Microphase separation or macrophase separation can occur, and there are a variety of possible Lifshitz points. Because of the ric…
Tension/compression thermomechanical experiments were performed on oriented CuAlNi shape memory alloy single crystals and CuAlZnMn single and polycrystals. Response of the single crystals in thermomechanical loads was strongly anisotropic, dependent on the orientation of the load axis and sense of the load. Tension/co…
The viability of sculptured thin film (STF) implementations of Šolc fan and folded filters for optical detection and determination of gas concentration is established. A nanoscopic–to–continuum model is devised for predicting the electromagnetic (optical) response of a STF Šolc filter whose void regions are filled wit…
The ionic conductivity and crystal structure of PbF 2 doped with high concentrations of KF, RbF and CsF have been investigated at elevated temperatures using complex-impedance spectroscopy and powder neutron diffraction. In the case of (PbF 2 ) 1- x -(KF) x , a high-temperature superionic phase with a body-centred-cub…
Electrical transport properties of polycrystalline ceramic specimens of the system ( x = 0.05, 0.10, and 0.15) have been investigated as functions of temperature by means of complex-plane impedance analysis, dielectric properties, four-probe dc conductivity, Seebeck coefficients, and magnetic susceptibilities. The typ…
It is pointed out that two, approximately `universal', dimensionless major characteristics of the sound velocity in liquid metals are also shared by the hard-sphere system as intrinsic properties of that simple model.
A capacitive sensor based on the theory of electric field measurements using floating electrodes has been developed for the measurement of VFTO and the same has been fitted to the metallic enclosure of a 145kV gas insulated substation (GIS) experimental test setup available in the laboratory. The sensor has been calib…
The use of sterically stabilized poly(ethyleneglycol)-coated liposomes (PEG-liposomes) is becoming increasingly important and several preparations based on long-circulating liposomes are already commercially available. From a clinical point of view, it is of importance to study the effect of multiple i.v. administrati…
Pepsin-solubilized elastin (PSE)-conjugated collagen film was prepared from a collagen matrix with PSE by drying it and crosslinking the constituents with water-soluble carbodiimide or microbial transglutaminase to improve the physical properties of the collagen film. The crosslinking reduced the solubility and improv…
The Heat Stress Index was an early model for the assessment of heat stress. The International Organization for Standardization (ISO) standard for required sweat rate is the current generation of heat balance methods for occupational heat stress. The method assumes cotton clothing and works adequately for cotton/polyes…
The magnetic anisotropy constant K1 and anisotropy field HA of M-type Sr-ferrite containing La and Co (Sr0.7La0.3Fe11.7Co0.3O19) were investigated by the singular-point detection (SPD) method using a pulsed field and SQUID magnetometers, and also by torque measurements. The value of HA=22.2 kOe was obtained by the SPD…