Materials Literature
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An epoxy monomer was cured in liquid crystalline phase with three different amines to form (LCT). The thermal transitions of the LCT were studied by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarized optical microscopy (POM). Different curing features are observed depending on t…
Whereas lignocellulosic fibers have received considerable attention as a reinforcing agent in thermoplastic composites, their applicability to reactive polymer systems remains of considerable interest. The hydroxyl-rich nature of natural lignocellulosic fibers suggests that they are particularly useful in thermosettin…
Carbon aerogels are prepared by a sol-gel process. By controlling the mass ratio of reactants and the molar ratio of resorcinol to catalyst (R/C), carbon aerogels with different microstructures can be developed. The electrical conductivity is measured by the van der Pauw method. The results show that the electrical co…
The first derivative of the hitherto elusive tripyrrin 2 was prepared and characterized; the X-ray structural analysis of its trifluoracetato-palladium(II) complex 7 displays a highly flexible N3 ligand.
Appropriate matrix formation, turnover and remodeling in tissue-engineered small diameter vascular conduits are crucial requirements for their long-term patency and function. This complex process requires the deposition and accumulation of extracellular matrix molecules as well as the remodeling of this extracellular…
Single phase europium-activated gadolinium aluminum borate, was obtained by the evaporation of its nitrate solution, and calcination at 900 to 1100°C in air. All the solid solution was identified as the isomorphs of huntite. activated showed intense red emission with CIE chromaticity coordinates of (0.645, 0.330) unde…
Adhesion energies of Cu-low k dielectric interfaces, measured with the technique of four-point bending, show a correlation to chemical mechanical polish results. A limit of 5 J/m/sup 2/ is established, below which thin film delamination and cracking are observed. In general, spin-on polymer dielectrics exhibit better…
Tantalum(V) oxide (Ta2O5) powders were synthesized by a solvothermal reaction of tantalum pentabutoxide (TPB) in toluene at 473–573 K in the presence of water. Ta2O5 powder with a large surface area (>200 m2 g−1) was obtained at 473 and 523 K, and its X-ray diffraction patterns showed no clear peaks of crystallites, w…
The trans/cis ratio of the azobenzene-attached bipyridine ligands in a cobalt complex is reversibly altered by a combination of photoirradiation with a single UV light source and the reversible redox change between Co(II) and Co(III).
The photocolouration of five spiro[2H-1-benzopyran-2,2′-indoline] compounds (1–5) and two spironaphthopyranindolines (6, 7) to give the ring-opened merocyanine(s) and the subsequent thermal relaxation back to the closed form was studied. A trans-merocyanine but no cis-photoisomer were detected for 1–7 using λexc = 308…
Dislocation loops observed in nonstoichiometric and stoichiometric (Ba,Ca)TiO 3 , and in stoichiometric BaTiO 3 sintered in a reducing atmosphere, were characterized by conventional transmission electron microscopy (TEM) under two‐beam conditions and high‐resolution TEM atomic structure analysis. Dislocation loops mos…
The efficient electroless deposition of gold from aqueous solutions has been achieved via redox interaction between Au(III) ions and conducting polymers such polypyrrole, polyaniline and poly(3,4-ethylenedioxythiophene). When using the doped, conductive bulk powder forms of these polymers, the average size of the gold…
Liquid crystals composed of photoactive groups, such as azobenzene, are promising materials for optical switching and image storage applications. On exposure to light LC materials commonly undergo an order-to disorder transition. Here, an unusual disorder-to-order transition is presented (the Figure shows a photo-indu…
A novel and simple synthetic method for the preparation of aragonite whiskers has been developed, whereby aqueous solutions of CaCl2 and Na2CO3 are combined in the presence of a suitable surfactant, poly(ethylene glycol)-20 000 (abbreviated as PEG), under ambient reaction conditions. The whiskers have high aspect rati…
Crosslinked samples of cis-1,4-polybutadiene (BR) were crystallized at low temperatures and then slowly melted. From volume changes and differential scanning calorimetry measurements, the degree of crystallization in the unstrained state was estimated to be about 20%, much lower than for natural rubber (NR). Crystalli…
A series of Gd-DO3A derivatives (8a–d) mimicking phospholipids have been prepared. Two of the complexes, Gd-HADB-DO3A (8a) and Gd-HADO-DO3A (8b), have been evaluated as pH responsive MRI contrast agents in vitro. The T1-relaxivity (r1) of Gd-HADO-DO3A (8b) increased 142% on changing the pH from 6 to 8. The pH dependen…
A magnetic suspension balance was used to measure solubility of CO 2 in PMMA in the temperature range 0 to 167 ° C and at pressures to 61.2 atm. CO 2 dissolves to considerable extent in PMMA, reaching a value of about 30 wt% at 0 ° C and 34 atm. Diffusion coefficients, derived from the sorption kinetics, were analyzed…
The properties of CdO films formed by low-pressure chemical vapor deposition were investigated as a function of deposition temperatures from 150-450°C. Atomic force microscopy, X-ray diffraction, and transmission electron microscopy revealed that the grain size, bulk crystallinity, and intragrain quality all improved…
The structures of Sr2FeO3F, Sr2FeO3Cl and Sr2FeO3Br have been investigated using powder neutron diffraction (PND). All three ferrates crystallise in the primitive tetragonal space group P4/nmm and the anions are fully ordered giving iron oxygen square pyramids separated by rock salt type layers of strontium halide. 57…
In this study, dual compatibilizers composed of the commercially available maleic anhydride-grafted polypropylene (PP–MA) and a multifunctional epoxy resin were demonstrated to effectively compatibilize the immiscible and incompatible blends of PP and poly(butylene terephthalate) (PBT). The PP–MA with a low MA content…