Materials Literature
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Field studies have been performed in residential areas to determine the load restoration process after a disturbance. Similar measurements were also performed for individual houses with different heating supplies. Load aggregation for the different houses during the same outdoor conditions have been made for various d…
The first observation of ordered microphase structures in poly(oxyethylene)–poly(oxypropylene) diblock copolymers melts is reported. Two diblock copolymers were synthesised by anionic polymerisation, i.e. E130P58 and E107P69 where E represents an oxyethylene unit, OCH2CH2, and P an oxypropylene unit, OCH2CH(CH3). The…
The analysis of the formation mechanisms for freckling and for random gram formation in single crystal castings has resulted in a general understanding of the principles involved, but has not been tested extensively against results in actual superalloy castings. In this work, we present the results of experimental wor…
Metallic Mo powder and Ti(OBun)4 were separately dissolved in H2O2 solution and the solutions obtained mixed in different Mo/Ti atomic ratios to prepare precursor solutions. Fresh gels obtained from the precursor solutions with > 40% Mo became blue upon exposure to ambient light. X-Ray photoelectron spectroscopy (XPS)…
In this paper the different reactivities of the di- and polysulfane chains of the silanes TESPD and Si 69 in model systems and under various reaction conditions, similar to those during rubber processing, are described. Due to the different reactivities the polysulfanes of Si 69 limit the upper processing temperature…
The deposition of ternary materials such as Cd1 − xZxnS by chemical bath methods is a problem due to differing hydrolytic stabilities of the two metals. A novel approach to the deposition of this material has been developed in which moderately acidic baths are used.
Neutral π-radicals of three lithium porphyrins (tetraphenylporphyrin [Li(TPP)·], 1, tetra(pentafluorophenyl)porphyrin [Li(PFP)·], 2, and tetra(3,5-bis-tert-butylphenyl)porphyrin [Li(TBP)·], 3) have been prepared and characterized using UV-vis, EPR, and IR spectroscopy, and, in the case of 1, X-ray crystallography.
The chemical vapor deposition of pyrolytic boron nitride from borazine (the B3N3H6–N2 system) in the temperature range of 1300–1800 °C and chamber pressures of 1–10 Torr has been studied using a cold-wall reactor. The density, phase composition and B/N ratio of the samples (0.2–0.8 mm thick) have been measured. The de…
The relationship between the polymer–solvent interaction and gelation behavior of poly(vinyl alcohol) (PVA) solutions prepared from ethylene glycol/water (EG/water) mixed solvents was investigated using a viscometer, light scattering, FTIR, X-ray, and pulsed NMR analyses. The viscometric result showed that the affinit…
The styrene–EPDM–vinylacetate (SEV) graft polymer, which linked respectively the styrene (St) unit and vinylacetate the (VAc) unit to the ethylene–propylene–diene terpolymer (EPDM) backbone was synthesized by two-step graft polymerizations: First the graft polymerization of VAc onto EPDM was carried out, and then St w…
Using an inert gas evaporation technique in combination with a simultaneous plasma polymerisation, copper clusters with mean diameters between 2.9 to 5.4 nm have been prepared within plasma polymer matrices from hexamethyldisiloxane (HMDSO) monomer. UV-visible spectroscopy of Cu clusters embedded in a plasma polymer f…
The noncontact technique that is described uses atomic oxygen, generated under low pressure in the presence of nitrogen, to remove soot and charred varnish from the surface of a painting. The process, which involves surface oxidation, permits control of the amount of surface material removed. The effectiveness of the…
Two linear oligo-TTFs were synthesised employing a stepwise strategy involving two different thiolate protecting groups. These linear TTFs were incorporated into donor–acceptor rotaxanes with the cyclic acceptor, cyclobis(paraquat-p-phenylene). Moreover, a prototype rotaxane based on a bis(pyrrolo)-TTF was prepared an…
An aluminogermanate, Na2Al2Ge3O10·2H2O (NaAlGe-NAT), possessing the natrolite topology has been synthesized under hydrothermal conditions at 423 K from sodium- and tetramethylammonium-containing gels. Room temperature single crystal X-ray diffraction data indicate a tetragonal unit cell with a = 13.314(2) and c = 6.81…
Copolymers of phenacyl methacrylate (PAMA) with acrylonitrile (AN) were prepared in 1,4-dioxane solution at 70 °C using 2,2′-azobisisobutyronitrile (AIBN) as initiator. The polymers were characterized by 1H and 13C NMR spectroscopic techniques. Also, solubility parameters, inherent viscosities, average molecular weigh…
The solid acid catalyst SbF3 supported on hexagonal mesoporous silica is an active and reasonably selective catalyst for the oxidation of cyclohexanone to caprolactone using hydrogen peroxide.
The influence of size distribution of intermetallic precipitates on hydrogen uptake behavior of Zircaloy during oxidation in steam has been examined in the pre-transition region to clarify the role of precipitates in the hydrogen transport through the coherent oxide layer. Two different types of specimens containing c…
Temperature-dependent EPR data of potassium-electro-sodalite (PES), K8[Al6Si6O24](e-)2, are consistent with the occurrence of an antiferromagnetic phase transition at 71?2 K. PES is a Mott insulator which contains an unpaired electron in every sodalite cage. The same transition in sodium-electro-sodalite occurs at a c…
The thermal stability of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(HB-co-HV)] and its blends with poly(propylene glycol)s (PPGs) and castor oil (CO) is reported. The study includes the determination of the degradation kinetics of these materials and the analysis of the effects of the degradation on the mechanica…
Phthalocyanines are synthetic dyes which are shown to be good photoconverters which can be applied in a photoelectrochemical cell constructed of semiconducting and metallic electrodes. By means of spectroscopic investigation (absorption,fluorescence and photoacoustics) we have followed spectral properties of phthalocy…