Materials Literature
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The combined physical analytical technique of thermogravimetric and infrared analysis (TG/IR) is described for the investigation of pharmaceutical solids. TG/IR provides an unequivocal identification of the volatile content of a pharmaceutical solid. In the case of pharmaceutical solvates, TG/IR provides identificatio…
TiO 2 nanocrystallites are prepared by hydrolysis of titanium tetraisopropoxide in the presence of N, N ‘-2,6-pyridinediylbis[undecamide]. The latter stabilizes the resulting semiconductor sol and provides sites at the surface of a nanocrystallite for selective binding of a uracil derivative by complementary hydrogen…
Cerium Concentration and Temperature Dependence of the Luminescence of SrGa2 S 4 : Ce , Na , a Blue‐Emitting Material for Electroluminescent and High Current Density Cathodoluminescent Displays, Ronot‐Limousin, I., Garcia, A., Fouassier, C., Barthou, C., Benalloul, P., Benoit, J.
Opalescent films of ca. 100 cm 2 (see Figure and this month's cover picture) based on a renewable resource, cellulose, have been prepared. The films are based on cholesteric, semi‐interpenetrating networks which result from the crosslinking of lyotropic liquid crystalline phases of cellulose carbanilates in commercial…
The electronic structure and the Fermi surfaces of the organic superconductor \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$ Cu[N(CN${)}_{2}$ ]Br are elucidated by first-principles calculations. The results show very narrow bands, high state density at the Fermi level, and a small band effective mass of 0.${28\mathrm{m}}_{0}$…
Abstract Crystallization of tripalmitin (TP) in sesame oil was investigated under isothermal conditions at a cooling rate similar to the one achieved in industrial crystallizers (1 K/min). The results obtained indicated that, at TP concentrations <0.98%, triacylglycerides of sesame oil developed mixed crystals with…
Treatment of acute burn wounds with silver sulfadiazine has raised concern of potential silver toxicity. As the wound heals, a barrier forms between the silver sulfadiazine and the blood, but this membrane is not impenetrable, and so silver absorption is still possible. In this work, we have modeled chemical systems t…
The potential and limitations of targeted delivery of anticancer agents with colloidal particulate carriers is the subject of this contribution. Because over the years liposomes have gained the most attention as carrier system in the category of colloidal carrier systems, this paper focuses on the utility of the lipos…
Abstract Treatment of acute burn wounds with silver sulfadiazine has raised concern of potential silver toxicity. As the wound heals, a barrier forms between the silver sulfadiazine and the blood, but this membrane is not impenetrable, and so silver absorption is still possible. In this work, we have modeled chemical…
Hydrotalcite-like compounds (HTLCs) having low (<5%) carbonate content and high (XAl > 0.33) layer charge can be synthesized under ambient pressure and atmosphere. This new approach uses terephthalate anions and manipulation of suspension pH to increase the substitution of Al for Mg in the octahedral sheet. Unit-cell…
Abstract Smectite and mixed-layer illite/smectite (I/S) in Triassic heulandite-rich bentonite from Kaka Point, New Zealand, have been investigated by scanning electron microscopy (SEM), transmission electron microscopy/analytical electron microscopy (TEM/AEM) and X-raydiffraction (XRD) for comparison with matrix phyll…
The photo-oxidation of germanium (Ge) nanostructures deposited by the cluster-beam evaporation technique is systematically studied. The significant photo-oxidation is found in the Ge-liquid nitrogen temperature (LNT) film, which was deposited on substrates whose temperature was kept at liquid nitrogen temperature duri…
peer reviewed
Growing cultures of Fibrobacter succinogenes S85 digested cellulose at a rapid rate, but nongrowing cells and cell extracts did not have detectable crystalline cellulase activity. Cells that had been growing exponentially on cellobiose initiated cellulose digestion and succinate production immediately, and cellulose-d…
A well-controlled, reproducible alignment with or without a pretilt angle is a basic need for the development of any kind of liquid crystal display. We have built an optical set-up based on the crystal rotation method. With this system we can measure the pretilt angle in nontwisted liquid crystal samples. Presentation…
Polymerization induced phase separation in mixtures of liquid crystals (LCs) and acrylates (Merck TL205/PN393) proceeds by liquid-gel demixing, in most cases of practical interest. At high LC content or low temperature of polymerization liquid-liquid separation cannot be excluded. Depending on the elasticity and homog…
A novel chirped distributed Bragg reflector (CDBR) structure was grown by metal-organic chemical vapor deposition (MOCVD) on a GaAs substrate where the optical thickness of each pair decreases monotonically from the bottom of the structure to the top surface. It was found that the fabricated CDBR structure can reflect…
By a numerical relaxation scheme we have simulated the plastic deformation of a quasicrystal. Shear stress was applied to a quasiperiodic icosahedral atomic configuration of Lennard-Jones particles, and nucleation of dislocation dipoles was observed which move in a slip plane. We also found climb motion and dissociati…
Abstract The effects of reaction time (2 to 72 h) and NH 4 + /A1 3+ molar ratio (1.6, 2.4 and 3.2) on the hydrothermal synthesis of ammonium-saponites are investigated. The gels are obtained by mixing powders, resulting in a stoichiometric composition, Mg 3 Si 34 Al 0.6 O 10 (OH) 2 , with aqueous ammonium solutions, w…
We report the first success in the preparation of transparent TS-1 zeolite film on a micro slide glass using nanosized TS-1 zeolite crystals (<100 nm). The nanosized TS-1 zeolite was crystallized at 80 °C and 1 atm. We intentionally controlled the zeolite particle size by using mild synthetic conditions and particle m…